Prime set up tianjin branch, promote the development of international trade

On November 18, located in tianjin binhai zone at nankai huayuan industrial district science and technology building of hunan prime steel pipe LTD co.,tianjin branch officially opened. The new company will be relying on tianjin traffic advantages, as well as Shinestar production resources of tianjin production base, to further promote the development of Shinestar of iron steel group international trade, for the global customers with high quality steel products and services.

Shinestar CEO Wang Li and Hunan prime steel pipe co., LTD., general manager of publicity and tianjin branch, head of the relevant departments attended the ceremony and cut the ribbon for the new company.

It is understood that last year put into production of tianjin production base, is based on tianjin Shinestar of iron steel group, radiation global manufacturing platform, has been committed to the construction of high yield, good performance, the domestic first-class, international leading steel production base, and gradually grasp own advanced production technology, constantly meet the greater needs of customers and improve comprehensive competitiveness of the market. Powerful production base in tianjin will no doubt provide solid at tianjin prime branch security capacity, make the prime no trouble back at home, at pushing into the international market.

Shinestar of iron  steel group are in the globalization development strategy phase, group subsidiary is oriented to the international market comprehensively, hunan prime steel pipe co., LTD., tianjin branch, is timely. At tianjin branch will focus on the layout in the Middle East, southeast Asia, Africa and parts of Europe and the United States and other international markets, provide dominated by straight seam welded pipe, synchronous provide seamless tube, spiral pipe and adapter tube of high quality products and perfect service.

Prime manager zhang said, at tianjin branch will continue adhering to the "good faith in mind, depends on the sincerity to win customers" work principle, to provide one-stop shopping service, professional team to meet customer the regulatory requirements of the project. Will also arrange all kinds of professionals in different links of supervision and monitoring, to ensure the high quality products to be produced.

As a world-class straight seam welded pipe production services suppliers, prime at committed to to the oil, gas, construction, energy and chemical industry, providing the quality are in conformity with price of steel pipe products, and always believe that effective communication, professional industry knowledge, rapid execution, lead the prime at with customers to establish long-term relations of cooperation.

Prime at belonging to Shinestar of iron steel group. As a base, service global production of large steel enterprises in China, Shinestar of domestic and international trade in 2016 double wave red, topped the top 100 enterprises of hunan. Its high quality steel products won a good market both at home and abroad. The future, Shinestar will toward building the "aircraft carrier" domestic steel procurement service as a whole and benchmarking enterprise's target for one hundred, and continuously.

Defects Of Welded Steel Pipe

Defects Of Welded Steel Pipe

Welded steel pipe production process is a steel sheet,strip,and other various molding methods using the straight press roll helical direction curling into a desired cross-sectional shape,and then by means of heart,prssure,different methods of welding weld weld together to obtain steel.Therefore,defects in the welded steel pipe is divided into two parts:the steel base material defects and weld defects.

1.Steel base material defect
The sheet material defects after rolling and other processes,most of planar,parallel to the surface;their main weakness delamination,cracks,folds,etc.,which is the most common layered internal defects.Stratification will produce a variety of cracks when the tensile stress perpendicular to the surface of the sheet by the hierarchical will seriously affect the strength of the steel pipe,it is not allowed defects.

2.Weld defects
Weld defects refers to defect during welding or after welding resulting in the weld is divided into cracks,proes,slag,incomplete penetration,incomplete fusion,undercut weld defects.Intensive weld porosity,slag,etc.a dense three-dimensional defects,cracks,lack of fusion and other  defects in the case of the flat,great harm.Strip slag.

Corrosion Problems of ERW Steel Pipe

ERW steel pipe outer coating of the basic functions,there are two aspects:
First,make the ERW steel pipe surface from electrochemical corrosion,bacterial corrosion protection of soil basic physical media.
Second,resist the soil medium move creep stress,basic mechanical protection method static sterss and abrasion strength and structure and so on.

The basic principles of the outer coating selected city gas pipeline:
a,good insulation properties and mechaniacal properties;
b,good resistance to cathodic disbanding performance;
c,good resistance to water,gas permeability;
d,good chemical resistance properties of soaking and aging;
e,low tempercature and high temperature performance;
f,easy mending and mending;
g,the price is reasonable.

Iron and steel industry prices fell, the reason why?

As we all know, often drop large iron and steel industry, the price is extremely unstable, so what is the cause of this phenomenon?Shinestar Steel Research Institute found through research, technology and the characteristics of the iron and steel industry, the cost structure resulted in the imbalance between supply and demand environment quantity adjustment special difficulties.

Specifically, the characteristics of modern steel production technology determines that the industry has a strong scale effect.This means that the iron and steel enterprises need to spend a huge amount of money to buy equipment and equipment to build production systems, resulting in a higher proportion of fixed capital amortization of depreciation in the total cost.Shinestar Steel Group attaches great importance to R & D investment, its R & D production of carbon steel pipe, welded steel pipe, line pipe, galvanized pipe and other excellent products, the market was highly recognized.

Under normal market conditions, the characteristics of the industry makes the steel enterprises with the average cost per unit of output with the output scale and reduce the advantages, is conducive to enhancing the competitiveness of enterprises by expanding the scale, so the rapid growth in market demand under the environment of enterprises with strong expansion impulse.However, the demand for reverse change and under the conditions of excess capacity, the objective needs of sales compensation huge cost sharing, will lead to reduced production enterprises facing special difficulties,makes an ordinary enterprise may have to accept the price is far below the average cost, the formation of the iron and steel industry seems to be more willing to price competition and regardless of the loss of the phenomenon.

At present, the entire industry is under the background of the capacity to understand the difficulties behind the steel enterprises are more conducive to the promotion of structural adjustment.Huge amortization cost constraints, in addition to the mentioned steel blast furnace if stewing furnace boiler stop need extra pay huge cost, which further increased the steel mills production scale down the economic difficulties.In addition, the government protection measures from the Angle of system distortion may prevent enterprises from the number and scale down.

Requires industry to face the question is: in 2009, 460 million tons of crude steel production in China, in 2015 the actual production capacity of more than 1.25 billion tons of crude steel in our country, production of 804 million tons.By profit nature of the enterprise, industry concentration degree increase, corporate profitability increased, the influx of capital, capacity expansion again, a single merger can not limit production capacity expansion.

Product navigation, production escort,Shinestar Steel Group has been very focused on product development and production, which owns the layout of Changsha, Xiangyin, Nanchang, Tianjin four production bases,combined shinestar steel R & D and production of the powerful platform, R & D and production of carbon steel pipe, welded steel pipe, line pipe, galvanized pipe and other excellent products, praised by customers.The future, Shinestar will continue to increase investment, the introduction of advanced technology and equipment, the more the production of more and better quality products, in order to adapt to the development of the globalization strategy.

The difference between ERW pipe and HFW pipe

The difference between ERW pipe and HFW pipe
ERW call is one of the resistance welding steel pipe, ERW are respectively corresponding to the first letter of the English word. Resistance welding steel pipe can be divided into ac and dc welding welding two forms.
Ac welding according to the different frequency is divided into low frequency, intermediate frequency brazing, intermediate frequency and high frequency welding welding. High frequency welding is mainly used for thin wall pipe or ordinary wall thickness pipe production, high frequency welding is divided into contact welding and induction welding.
Dc welding is commonly used in small diameter steel pipe.
So, in general, the high frequency welded pipe contained in ERW welded pipe, is a kind of high frequency welding process production ERW welded pipe.

Price Adjustment for Q345 Welded Carbon Steel Pipe

Price Adjustment for Q345 Welded Carbon Steel Pipe

The focus of the current market or gathered in the social stock of Q345B longitudinal welded pipe, the five statistics on Friday the total inventory of the five Q345B longitudinal welded pipe stock total 8.44 million tons, 0.4% WoW, down 9.2%; five Q345B straight seam Weld pipe plant inventory total of 4.899 million tons, an increase of 4.9% WoW, down 16.3% year on year. If you look at the current social stock of Q345B longitudinal welded pipe absolute quantity, there is no doubt that the current market inventory pressure is small, but the steel plant inventory began to rise is worth noting. Because the five major varieties of social stock as a result of the decline in the sample caliber representative, in fact, outside the caliber of the amount of resources or trends in the trend of the sample is not the same, so the process of resource dispersion trend is often the core regional stock transfer to non-core areas .
In addition, as the "car limit set" strictly enforced, in fact, the increase in the amount of in-transit resources have been ignored, taking into account the limited capacity of vehicles in southern China, for example, motor transport cycle basically from the past 1-2 days to 2-5 days , That is, the amount of vehicles in transit than in the past to look through; the same token, in the original fuel materials also exist such a situation. If the vehicle capacity does not improve, this resource does not constitute a pressure on the market, but this year, truck sales rose significantly, from January to October 2016 more than 40 tons of semi-tractor sales rose 98.5%; 25-40 tons between the semi-traction Car sales rose 16.6%; 25 tons and below semi-tractor sales rose 119% year on year.
But in October, more than 40 tons, 25-45 tons and 25 tons the following semi-tractor sales were up 45.9%, 68.4% and 117.8%. In general, the truck sales to the road takes 50 days or so, once the capacity to enhance, ask who is willing to increase the transport cycle to extend and bear the burden of resources and risk of funds in transit, then the latter is not there will be a lot of transit resources into social stock To be tested!
Raw materials, the domestic coal mine production safety requirements more stringent, the major domestic coal mines to ensure safe production, production than the previous period have different degrees of decline, making most of the coking plant inventory of refined coal declined support coking coal prices continue to be strong . Affected by this, high-grade iron ore spot prices are also supported, the current futures and spot basis also reflects this trend. So hope that the original fuel material spot fell may not be desirable, but rather need to pay attention to the price difference between the repair. Of course, this premise is the production of steel production enterprises will not substantially

cut.

The price of Spiral steel pipe, ERW steel pipe and LSAW Steel pipe strong gains, detonate market

The price of Spiral steel pipe, ERW steel pipe and LSAW Steel pipe strong gains, detonate market
Opening on the first day of November, the steel price of most strong steel mill steel factory continue to pull up, spiral steel pipe, 3 PE anticorrosive coating spiral pipe, large diameter spiral pipe, double-sided submerged arc spiral welded pipe, ERW steel pipe,LSAW steel pipe and other products prices are raised. Flying start in early November, does it presages off-season does not light in November?
First ,high steel cost
Review of October rally, one important reason is represented by coke raw material prices continued to rise, the cost of steel high spot for offer high provides a relatively solid foundation.
According to research, on the other hand, the national building materials steel blast furnace capacity utilization is 80.3% at present, the blast furnace capacity utilization rate is 70.4%, is still at a relatively high, reflecting the steel mill in a short period of time will still have strong demand for raw materials. And along with the finished material continue to rise, also continues to rise in the price of scrap steel, raw material rises, the overall steel mills also shows no sign of large-scale production cuts in the short term, the high cost of steel price support is still relatively strong.
Second, the influence of the steel plant policy
1, the national most spiral steel pipe,, 3 PE anticorrosive coating steel pipe, large diameter spiral pipe, DSAW steel pipe, welded steel pipe and other products significantly raised ex-factory price, the market to boost the effect is very obvious. And steel mills in the extent of the increase 100 yuan/ton, in the market to accept the critical value, it is acceptable in the market, not the other markets from point of view, to the market to a certain extent, drew a look within easy reach of the pie, to stimulate the enthusiasm of market.
In east China is currently in the national steel price depressions, anhui, jiangsu, fujian, shandong and other places of steel mills to south China, southwest and other places more shipments, the supply end of the east China area stress is relatively small.
Three, inventory data to change direction
According to the author, the recent steel stock continues to decline, the late steel price pressure is low. Dominate the market in zhejiang province, hangzhou's stock market is also continued to decline, the current 427200 tons of rebar inventories, including pledge remove about 80000 tons of resources, the overall inventory relatively normal, market inventory pressure is not big. But is alarming, according to statistics, only in hangzhou building materials inventory reduced 18300 tons, compared with a national thread, wire total inventory levels over the same period of last year for the first time this year, indicated that the recent market direction will change?
Forth, falling demand
From the monitoring data show that since the middle of October, volume data is reduced, the downstream demand began to weaker. On steel prices rose in early October a powerful support is to clinch a deal the data better. Volume surged in early October, it now appears that the biggest possibility is part of the market demand is suppressed, in September to October, the other is after the National Day holiday is concentrated inventory demand downstream. Demand off-season better be falsified.
Fifth, the bad effect ofweather and temperature
Now in November, look from the season is winter, in the traditional sense of the demand of season. Downstream terminal operation in winter time is predictable, the amount of the purchase of building materials is also weakening, late end demand weakening big probability event was predictable.

Galvanized Steel Pipe Using Advantages

Galvanized Steel Pipe Using Advantages

When we talk about the galvanized steel pipes, we usually refer to the hot dipped galvanized steels pipes which are more durable and strengthened than any other types. The cleaning process which the hot dipped galvanized steel pipe uses is far more special in the combination use of the solutions, including the ammonium chloride, zinc chloride or the mixed solutions of both. And it will be sent into the hot dipped groove afterwards. The galvanized steel tube will be with more even layer of the galvanization and the capacity of cohesion, anti-corrosion and anti-dust. All of these as mentioned above will contribute to this kind of steel pipe to be have longer longevity than any other steel pipe kinds.

The regular specification of the galvanized steel tubing which are available from SHINESTAR include 48.3×2.5、48.3×2.75、48.3×3.0、48.3×3.25、48.3×3.5 and other customized types per required.
To maintain these galvanized steel tubes, we should keep in mind about these following steps:
1. Regular clean away the piling-up materials around the steel and control its loading under its limitation.
2. Regular observe if there is any deviation among the steel tube's whole structure of parts of it. If yes, make alteration in time.

Advantages of welded pipe

Advantages of welded pipe

Structural welded pipe (tubing) can be used for a wide variety of mechanical applications. It may be used either statically or dynamically. Its close tolerances, good finish, and dense structure make it ideal for parts such as structural support and parts, frames, racks, trailer beds and trailer components, structural components and supports for buildings, bridges, and highways, conveyors, machine parts, ornamental usages and a wide range of applications in industrial, construction, automotive, appliance and agricultural industries.

Welded pipes are generally more cost effective than the equivalent seamless alternative. They are significantly more available both from distributor and mill stocks and from a mill production lead time perspective. With longer lead times seamless tubes can be exposed to unknown alloying price extras that can fluctuate substantially, hence it can be difficult to plan and predict the true costs for the material. Therefore in addition to faster delivery times for Erw tubes, there is the added advantage of lower economical risk. Erw welded steel tubes generally have better surface quality as compared with manufacturing seamless tubes. Seamless tubes are generally made in multiple steps starting with hot extrusion to form the tube hollows from billets.

Austenitic Stainless Steel

Austenitic Stainless Steel
Low carbon, iron-chromium-nickel stainless alloys containing more than 16% chromium, and 4 to 22% nickel to provide an austenitic structure at normal temperatures. These alloys cannot be hardened by heat treatment, but can be hardened by cold working. They are normally non-magnetic in the annealed condition, but can become slightly magnetic after cold working depending upon composition.

Austenitic Stainless Steel Pipe
Austenitic stianless steel pipe recers to the normal temperature of austenitc stianless steel containing about 18% of Cr, 8%~10% of Ni, 0.1% of C and a stable austenite. Austenitic chrome nickel stianless steel pipe including the famous 18Cr-8Ni steel. On this basis to increase the Cr, Ni content and adding Mo, Cu, Si, Nb, Ti and other elements developed high Cr-Ni series of steel pipe. Austenitic stainless steel pipe is non-meganetic and has high toughness and plasticity. However, the strength of austenitic stainless steel pipe is low which can not be strengthened by phase transformation and can only be strengthened by cold working, such as addign S, Ca, Se, Te and other elements which has a good easing cutting characteristic.

SAE/AMS Specifications Sheet

SAE/AMS Specifications Sheet

SAE-J356 Welded Flash Controlled Low Carbon Steel Tubing Normalized for Bending. Double Flaring and Beading.
Covers normalized electric resistance welded tube ID flash-controlled .005" to .010" manipulative quality.
SAE-J524 Seamless Low Carbon Steel Tubing Annealed for Bending and Flaring.
Covers cold drawn seamless JIC hydraulic line tubing.
SAE-J525 Welded and Drawn Low Carbon Steel Tubing Annealed for Bending and Flaring.
Covers welded and drawn JIC hydraulic line tubing.
SAE-J526 Welded Low Carbon Steel Tubing.
Covers annealed welded tube with ID flash-in for general automotive applications.
SAE-J527 Brazed Double Wall Carbon Steel Tubing.
Covers copper brazed double wall low carbon steel tube intended for general automotive applications and other similar uses. Suitable for bending, forming and double flaring.
SAE-J529 Fuel Injection Tubing.
Covers low carbon steel tube specially manufactured for high pressure fuel injection lines for diesel engines.
AMS-5050 Seamless Annealed Low Carbon Steel Tube.
Covers cold drawn seamless JIC hydraulic line steel tubing for aircraft applications.
AMS-5062 Seamless Low Carbon Steel Tube.
Covers cold finished or hot finished seamless low carbon mechanical steel tube.
AMS-6360 Seamless SAE 4130 Alloy Steel Tubing.
Covers aircraft quality 4130 tube in condition N temper. Similar to MIL-T-6736 specification.
AMS-6365 Seamless SAE 4135 Alloy Steel Tubing.
Covers aircraft quality 4135 tube in condition N temper. Similar to MIL-T-6735 specification.
AMS-6371 Seamless SAE 4130 Alloy Steel Mechanical Tubing.
Covers electric furnace grade magnaflux quality 4130 aircraft tube, either hot finished or cold finished, hardenable.
AMS-6372 Seamless SAE 4135 Alloy Steel Mechanical Tubing.
Covers electric furnace grade magnaflux quality 4135 aircraft tube, either hot finished or cold finished, hardenable.
AMS-6381 Seamless SAE 4140 Alloy Steel Mechanical Tubing.
Covers electric furnace grade magnaflux quality 4140 aircraft tube, either hot finished or cold finished, hardenable.
AMS-6415 Seamless SAF 4340 Alloy Steel Mechanical Tubing.
Covers electric furnace grade magnaflux quality 4340 aircraft tube, either hot finished or cold finished, hardenable.

The Safe Ways to Use Scaffolding System and Tubes

In high-rise building construction, every step outside the frame to be paved with bamboo basketry or steel fabric, in addition to deaden 1 m high railing and standing bamboo basketry board. On the outer edge of the scaffold, set up safety set net.

Second, the floor protection measures. Now most of the high-rise buildings are concrete frame constructions, widespread adoption MS pipe scaffolding support steel formwork construction. In order to do the protection of the floor construction, can use floor frame. Guard is equal to the height of the two floors of the building, protecting frame width is equivalent to the length of the building a studio.(floor care on the scaffolding tube can prevent falling to the lateral personnel construction, can also be used as a construction safety channel.)  

Three, floor slanted protective measures Some concrete frame building, caused by a lack of hoisting equipment, inconvenient installation floor frame, using steel formwork support. Preferably in the surrounding buildings, the erection slanted plane, vertical height and construction of building height, the same set-up of ledger, carry on oblique one safety net. (the floor is slanted frame, also can prevent the staff falling to the outside, but in the build-up to pick frame, workers have to switch seat belt) four, socket frame protection measures.

Some high-rise building, using the plug in or the ingate cast-in-place reinforced concrete shear wall construction method, in order to ensure the safety of construction personnel. Tool type socket frame can be used, the height of the socket frame over a layer of floor, can prevent the construction layer surrounding the staff fall outward.

Vietnam steel industry has high growth potential

According to the Viet Nam Steel Association, the country's steel industry has great development potential. Speaking at a seminar titled "Viet Nam's steel industry – rise and fall and development potential" in HCM City on Monday, Dr Nguyen Van Sua the association's vice chairman said that per capita consumption in Viet Nam is 200kg, below the world average of 216kg. he said that "In an industrialised economy, the per capita consumption ranges from 500kg to 600kg."

Petro China and Malaysia has sighed Sabah Natural Gas Pipeline Project

On the afternoon of November 1, 2016, under the witness of Premier Li Keqiang and Malaysian Prime Mnister Najib Razak, The deputy general manageer of China National Petroleum Corporation (CNPC) Liu Hongbin and the Chairman of Strategic Energy Co., Ltd of Sulia Mohammad Evan Seriga Abu, on behalf of the two companies, have dual signed the Contract for the Construction and Trail Operation of Sabah Gas Pipeline Project and the Contract for Construction and Commissioning of Multu-medium Pipeline Project in Beijing.

Sabah gas pipeline and multi-media pipeline is the Malaysian federal government-led projects. Under the agreement, China Petroleum Pipeline Bureau will EPCC way to undertake the construction of these two pipeline projects.

In Stock ERW Steel Pipe Price 2016/11/11

API 5L/A53   GR.B, ERW Steel Pipe, Carbon Steel
Outside Diameter	Wall Thickness	Length	Quantity 数量		Remark 标记	EXW CHINA 出厂价
外径 (mm)	壁厚 (mm)	长度 (mtr)	PCS 根数	TON 吨位	Surface,End	USD/TON 美金每吨
168.3	7.5	5.8	50	14.24	BE. BARE	$515.82
355.6	6.8	6.5	75	10.86	BE. BARE	$546.80
508.0	13.0	12	6	2.94	BE. BARE	$560.27
114.3	9.5	6	30	14.30	BE. BARE	$583.16
273.0	8.5	11.8	30	54.91	BE. BARE	$518.52
139.7	4.9	6.5	23	2.55	BE. BLACK	$507.74
219.1	10.5	6	56	22.20	BE. BLACK	$531.99
273.0	9.3	12	23	17.04	BE. BLACK	$523.91
355.6	12.7	6	30	13.10	BE. BLACK	$565.66
406.4	6.4	12	70	40.75	BE. BLACK	$552.19
33.4	3.5	6	132	2.04	BLACK	$504.62
48.3	4.25	6	56	1.55	BLACK	$516.92
73	5.5	6	42	2.31	BLACK	$523.76
76.1	5.5	6	110	6.32	BE. BLACK	$521.03
108	6.5	6	59	5.76	BLACK	$552.48
127	5.6	6	73	7.34	BE. BLACK	$501.48
133	7.7	6	142	20.27	BLACK	$493.68
152	4.3	6	230	21.61	BE. BLACK	$497.48
165	6.0	6	114	16.09	BE. BLACK	$505.98
168.3	3.5	6	165	14.08	BLACK	$490.94
26.7	2.87	6.1	198	2.04	BLACK	$507.94
42.2	3.56	6	345	7.02	BLACK	$498.58
48.3	3.7	5.8	129	3.03	BLACK	$489.22
33.4	3.9	5.8	432	7.12	BE. BLACK	$489.22
73	3.4	5.8	368	12.39	BE. BLACK	$498.58
159	6.0	6.1	123	16.99	BE. BLACK	$481.20
273	9.3	6.1	301	110.70	BE. BLACK	$514.62
133	6.5	5.8	220	25.87	BE. BLACK	$485.21
178	8.0	5.8	206	40.07	BE. BLACK	$491.90
168.3	7.1	6	188	31.88	BE. BLACK	$490.56
Note:  1. The above price is based on bare pipe, for extra coating, please contact sales@primesteeltube.com;
2. The above price is based on EXW, for FOB/CIF/CFR price, please contact sales@primesteeltube.com;
3. The above price is not including any packing and end processing charge, for detailed quotation, please contact sales@primesteeltube.com;
4. The above price is only valide during NOV 11-  18;
5. The applicapable MOQ for this price list is over 25 tons;

Difficulties in Wall Thickness Control for Straight Seam Steel Pipe Process

Straight seam steel pipe wall thickness control is a difficult production. At present, the straight seam steel pipe manufacturers to improve the wall thickness in the production of precision uses the methods generally including:

1, Tube heating
Heating to the average to prevent rapid up and down temperature. Each take-off and landing temperature is to maintain a smooth slow, the maximum rise and fall temperature does not exceed 30 ℃.
2, Rolling mill mandrel
Average wall thickness of thick wall tube and solid billet make the probability of mandrel bending deformation significantly reduced, can effectively improve the wall thickness of the precision.
3, The accuracy of mandrel
The outer core of the machining accuracy control in ± 0.1mm, mandrel straightness bias does not exceed 5mm. Welding, the two core rods between the piercing a finishing pin positioning, welding in order to avoid the formation of the total straightness bias is too large.
4, The perfect process
Determing whether the centering roll device in place, adjust the relevant core roller in the middle, open the angle and the size of the initiative of the same opening, the middle of the rolling core in the rolling line.
5, Centering roller
Perfect process is to avoid the center pull thin and wall thickness beyond the control limitations of the state of attack, improve wall thickness accuracy.
6, Perforated mandrel
General choice of perforated mandrel diameter Φ108mm-Φ114mm, wall thickness requirements ≥ 25mm and wall thickness of the average thick-walled tube.
7, Rolling the middle line
Making sure that the middle line of the piercing mill is consistent with the middle line of the piercing trolley to prevent "upper rolling" or "lower rolling", so that the billet sticks to the average force during the piercing.
8, Rolling things
On the wear of the head, guide, roll and other rolling things to be real-time change.
9, Rolling things device
Roller distance, the distance must be in the middle of the rolling line. Guaranteed the distance between the guide and the middle of the roller in the middle of the piercing rolling, the upper and lower roller equal to the left and right lead from the same.

How to Weld for the ERW Steel Pipe in Winter

To ensure that the erw steel pipe in the winter welding perfect follow the following steps:
First, increase the welding current welding, slow down the welding speed, the appropriate increase in the cross-sectional area and length of the weld, if necessary, preheat.
Second, not outside the groove on the base metal to start arc, arc extinction to be filled when the pit.
Third, as far as possible not in low temperature conditions for bending, correction and assembly weldments.
Fourth, preheating before welding, welding process to strictly maintain the interlayer temperature should not be lower than the preheating temperature.
Fifth, the use of low hydrogen or ultra-low hydrogen welding materials.
Six, the entire weld should be finished as far as possible to avoid interruption.