Advantages and Disadvantages of Scaffolding Pipe

Several days ago, Prime Steel Pipe shared the brief introduction of scaffolding pipe, I believed that those people who saw that article must have a basic understanding to scaffolding pipe. Today, Prime Steel Pipe will continue to share some information of that, its advantages and disadvantages will be listed below.

Advantages of scaffolding pipe:

1) Bearing capacity is large. When the scaffolding geometry and construction in line with the relevant requirements of the specification, under normal circumstances, the capacity that single tube of scaffolding can bear will reach up to 15kN ~ 35kN (1.5tf ~ 3.5tf, design).
2) Easy assembly and disassembly, erection flexible. As the length of the pipe is easy to adjust, fastener connection is simple, thus it can be adapted to a variety of flat, facade buildings and structures with scaffolding.
3) More economical. Processing is simple, primary investment costs is low; if carefully designing scaffold geometry, paying attention to improve the use of steel pipe turnover, the amount of material can also achieve better economic results. The amount of steel in the building per square meter of fastener steel pipe frame equivalent is about 15 kg.

Disadvantages of scaffolding pipe:

1) Fasteners (especially its screw) are easy to lose;
2) The bar at the node for the eccentric connection, by the anti-slip force transmission load and internal force, thus reducing its carrying capacity;
3) The connection quality of the fastener joint is significantly affected by the quality of the fastener itself and the operation of the worker.

Advantages and Disadvantages of Scaffolding Pipe

Several days ago, Prime Steel Pipe shared the brief introduction of scaffolding pipe, I believed that those people who saw that article must have a basic understanding to scaffolding pipe. Today, Prime Steel Pipe will continue to share some information of that, its advantages and disadvantages will be listed below.

Advantages of scaffolding pipe:

1) Bearing capacity is large. When the scaffolding geometry and construction in line with the relevant requirements of the specification, under normal circumstances, the capacity that single tube of scaffolding can bear will reach up to 15kN ~ 35kN (1.5tf ~ 3.5tf, design).
2) Easy assembly and disassembly, erection flexible. As the length of the pipe is easy to adjust, fastener connection is simple, thus it can be adapted to a variety of flat, facade buildings and structures with scaffolding.
3) More economical. Processing is simple, primary investment costs is low; if carefully designing scaffold geometry, paying attention to improve the use of steel pipe turnover, the amount of material can also achieve better economic results. The amount of steel in the building per square meter of fastener steel pipe frame equivalent is about 15 kg.

Disadvantages of scaffolding pipe:

1) Fasteners (especially its screw) are easy to lose;
2) The bar at the node for the eccentric connection, by the anti-slip force transmission load and internal force, thus reducing its carrying capacity;
3) The connection quality of the fastener joint is significantly affected by the quality of the fastener itself and the operation of the worker.

International Market Continues to Force, South African Customers Visit Shinestar Head office

Shinestar in the international market continue to develop in recent years, the company's various products are extremely popular with more and more foreign customers. Recently, the representative of customer from South Africa arrived at the headquarters of Shinestar and conducted a field visit, Shinestar company had a warm reception to guests from afar.

This time South African customers visited Shinestar, on the one hand they conducted a field visit to Shinestar, on the other hand they wanted to achieve in-depth cooperation of ERW steel pipe with us. Accompanied by the Shinestar Group shareholders, group vice president, general manager and client manager of Prime Steel Pipe, South African customers visited the headquarters of Shinestar, Shinestar conducted a comprehensive understanding. General manager of Prime Steel Pipe introduced the current development of Shinestar, product technology improvements and past cases to South African customers in detail. For the various problems raised by customers, business elites accompanied have made a detailed solution, their excellent professional knowledge and work ability left a deep impression to the customer.

After the visit, South African customers had a highly recognition on the strong company strength, professional production platform, strict quality control of Shinestar, and had in-depth discussion on the future cooperation between the two sides. In this cooperation, customers from South African hoped that they could purchase 3,000 tons of ERM steel pipe every two months from Shinestar, while they would continue to cooperate the follow-up of the demand for section, and they said that they would finalize the details of the contract at the first time after returning to their motherland.

Shinestar as the overall procurement of steel services that based on the China and provided the global service, its steel products by independent research exported to Europe, the Middle East, Southeast Asia, North America, Australia, more than 100 countries and regions, has gradually become the international market more and more hot star. This time South African customers visited here, not only strengthened the close communication of Shinestar to foreign customers, but also show the strength of Shinestar to international.

With the promotion of Shinestar Group's globalization strategy and the expansion of overseas business, which also put forward new requirements to the company's development. In the future, Shinestar will effectively grasp the production, quality, sales, service and other links, accurately grasp the opportunities, and strive to open up the market, to further meet the changing needs of customers around the world, more robust towards the international arena.

LSAW Steel Pipe Manufacturing Process

LSAW steel pipe manufacturing process is simple, its production efficiency is high and at low cost, the development of straight seam welded pipe is rapid. Therefore, the straight welding is mostly used in smaller diameter of steel pipe. Today, as an excellent steel pipe manufacturer, Prime Steel Pipe will share the LSAW steel pipe manufacturing process in details for all of you.

LSAW steel pipe Manufacturing process:

1.Plate Analyzing：After the steel plate used to manufacture large diameter LSAW steel pipe entering into the production line, steel pipe manufacturer should carry out ultrasonic testing to the whole plate;

2.Edge Milling: Through the milling machine to carry out double-sided milling on both sides of the steel plate, to make it achieve the required plate width, board parallelism and groove shape;

3.Edge Crimping: Using the pre-bending machine to preliminary rolling, so that the board has the required curvature;

4.Molding: In the JCO forming machine At the first, steel pipe manufacturer should do stamping repeatedly for half of the pre-bent steel plate in the JCO forming machine, so that the steel plate is formed "J" shape, and then bending the other half of steel plate to form "C" shape, and finally formed the opening of the "O" shape;

5.Tack Welding: Making the LSAW steel pipe after forming joint colse and using the gas shielded welding (MAG) for continuous welding;

6.Automatic Internal Welding: Using vertical multi-wire submerged arc welding (up to four silk) to weld in the inside of the LSAW steel pipe;

7.Automatic External Welding: Using vertical multi-wire submerged arc welding to weld in the outside of LSAW steel pipe;

8.Automatic UT I: Using Automatic UT to 100% test the inside and outside wleded seam of LSAW steel pipe and the base material on both sides of weld seam;

9.X-Ray Testing I: Carrying out 100% X-ray industrial television inspection on the inside and outside the weld seam, and using image processing system to ensure the sensitivity of testing;

10.Mechanical Expanding: Expanding the full length of LSAW steel pipe to improve the dimensional accuracy of steel pipe and improve the distribution of stress in steel pipe;

11.Hydrostatic Testing: Testing the steel pipe after expanding one bu one in the hydraulic test machine to ensure that the steel pipe to meet the standard requirements of the test pressure, the machine has automatic recording and storage functions;

12.Chamfering: the pipe passed the inspection will be carried out pipe end processing qualified, to achieve the required pipe end groove size;

13.Automatic UTⅡ: Testing pipe one by one again by using root ultrasonic inspection to examine if there is defect on LSAW steel pipe after expanding and hydrostatic testing;

14.X-Ray TestingⅡ: Carrying out X-ray industrial television inspection on the pipe after expanding and hydrostatic testing, and take photos of the weld seam in the end;

15.Pipe End Magnetic Particle Testing(MPT): Carry out this inspection to find pipe end defects;

16.Corrosion protection and coating: Qualified steel pipe will carry out corrosion and coating according to user requirements.

Welded Steel Pipe: Control of Welding Slag Inclusion and Stomata Defects

When steel pipe manufacturer (such as Prime Steel Pipe) producing welded steel pipe, it is unavoidable that some welding slag inclusion and stomata defects may appear if workers don't control very well during operation. So we will talk about the causing reason of welding slag inclusion and stomata defects here, and then we will give preventive measures for you. More details are as follows.

Causing reasons of welding slag inclusion:

1) Back chipping after backing welding is halfway, which results in the root slag did not completely overflow when heat welding rapidly.
2) The way to backing weld back chipping may be wrong, so that the groove on both sides of root pass is too deep, and shows "W". In the rapid heat welding, the slag flowing into the deep trough is too late to overflow and form slag.
3) At 6 o'clock position, arc too fast is also easy to produce slag.

Preventive measures:

1) Using grinding wheel to remove slag after the backing weld, back gouging must be thoroughly, each joint point must be flat.
2) When back chipping the root weld bead will be clear into the "U" shaped groove, and avoid to be the "W" shaped slot.
3) When retreating the arc at 6 o'clock we need to fill the molten pool, and then move arc to the forming of the weld to collect arc, and use flat swing method to extinguish the arc.

Causing reasons of stomata defect:

1) The molten pool is overheating when cosmetic welding, and adsorb a lot of ambient air.
2) The amplitude of swing of welding rod is too large when cosmetic welding, the molten pool is be protected badly.
3) The root gap is too small, which is easy to produce root needle bubble.
4) The electrode is not used for a specified period of time or prolonged exposure to air.

Preventive measures:

1) The current should not be too large when capping, we should use the small current, short arc, and welding with fast welding speed to avoid overheating and prevent surface pores.
2) We should use the appropriate transport technology to weld, otherwise it will make the molten pool ahead, and easy to cause long short circuit and the electrode stick on the weld, which is unfavorable to deoxidize and easy to produce pores. But the width of electrode swing should not exceed twice the diameter of the electrode, otherwise it is easy to produce pores.
3) We should prevent the group on the gap is too small, if the group on the gap is too small, it will cause overlarge base metal dilution effect in the welding, and impede the exhaust, which will results in the root of bubbles.
4) Electrode should be stored in the electrode insulation tube in the use of the process. It is strictly prohibited that welding rod is exposed outward, we need to prevent the welding rod damp.

Welded Steel Pipe: Control of Welding Slag Inclusion and Stomata Defects

When steel pipe manufacturer (such as Prime Steel Pipe) producing welded steel pipe, it is unavoidable that some welding slag inclusion and stomata defects may appear if workers don't control very well during operation. So we will talk about the causing reason of welding slag inclusion and stomata defects here, and then we will give preventive measures for you. More details are as follows.

Causing reasons of welding slag inclusion:

1) Back chipping after backing welding is halfway, which results in the root slag did not completely overflow when heat welding rapidly.
2) The way to backing weld back chipping may be wrong, so that the groove on both sides of root pass is too deep, and shows "W". In the rapid heat welding, the slag flowing into the deep trough is too late to overflow and form slag.
3) At 6 o'clock position, arc too fast is also easy to produce slag.

Preventive measures:

1) Using grinding wheel to remove slag after the backing weld, back gouging must be thoroughly, each joint point must be flat.
2) When back chipping the root weld bead will be clear into the "U" shaped groove, and avoid to be the "W" shaped slot.
3) When retreating the arc at 6 o'clock we need to fill the molten pool, and then move arc to the forming of the weld to collect arc, and use flat swing method to extinguish the arc.

Causing reasons of stomata defect:

1) The molten pool is overheating when cosmetic welding, and adsorb a lot of ambient air.
2) The amplitude of swing of welding rod is too large when cosmetic welding, the molten pool is be protected badly.
3) The root gap is too small, which is easy to produce root needle bubble.
4) The electrode is not used for a specified period of time or prolonged exposure to air.

Preventive measures:

1) The current should not be too large when capping, we should use the small current, short arc, and welding with fast welding speed to avoid overheating and prevent surface pores.
2) We should use the appropriate transport technology to weld, otherwise it will make the molten pool ahead, and easy to cause long short circuit and the electrode stick on the weld, which is unfavorable to deoxidize and easy to produce pores. But the width of electrode swing should not exceed twice the diameter of the electrode, otherwise it is easy to produce pores.
3) We should prevent the group on the gap is too small, if the group on the gap is too small, it will cause overlarge base metal dilution effect in the welding, and impede the exhaust, which will results in the root of bubbles.
4) Electrode should be stored in the electrode insulation tube in the use of the process. It is strictly prohibited that welding rod is exposed outward, we need to prevent the welding rod damp.

Material and Standard Classification of SSAW Steel Pipe

Material of SSAW steel pipe:

SSAW steel pipe (also called spiral welded pipe) is the steel pipe with spiral seam that using strip coil as raw material, extrusion forming under normal temperature, and welding by automatic Double wire double-sided submerged arc welding process. The material of it includes: Q235A, Q23b, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, Q345, L245(B), L290(X42), L320(X46), L485(X70), L555(X80).

Standard classification of SSAW steel pipe:

1. Spiral welded pipe (SY5036-83) used for pressurized fluid transportation is mainly used for conveying oil and natural gas pipeline.
2. Spiral seam high-frequency welded steel pipe (SY5038-83) used for pressurized fluid transportation, it is welded with high-frequency welding method. The loading capacity of it is powerful, the plastic is good, and it is easy to weld and machine shaping.
3. Spiral welded pipe (SY5037-83) used for general low-pressure fluid transmission, it is welded with double-sided automatic submerged arc welding method or one-side welding method, it is mainly used for water, gas, air and steam and other general low-pressure fluid delivery.

Now general standards for SSAW steel pipe is generally divided into: SY/T5037-2000 (ministerial standard, also known as spiral submerged arc welded steel pipe for ordinary fluid transportation pipeline), GB/T9711.1-1997 (Chinese standard, also known as pipe for oil and gas industry transportation, API-5L (American Petroleum Institute, also known as pipeline steel pipe; which is divided into PSL1 and PSL2), SY/T5040-92 (spiral seam submerged arc welded pipe for pile).

Prime Steel Pipe as a excellent manufacturer and exporter of steel pipe, will provide the spiral welded pipe with highest quality and the most comprehensive service for our customer. If you are interested in our products, you can click the hyper-link to view details.

China's Program will Inject New Impetus into Globalization

World economy needs to strengthen global economic governance, but the British off the EU referendum and Trump put forward the "US priority", which made regionalization to split and lost in globalization. In Europe, the US strategy is shrinking. In this context, new forces are needed, and new programs are leading global governance to a new stage. China is the world's second largest economy, China's economic development can not be separated from the world, the world's economy also needs China.

From the financial, trade, investment the three areas, by the effect of new president of the United States and the dollar interest rate and other factors, the global financial market will remain volatile and uncertainty in the short term, especially in emerging market countries will have to face the risk of currency devaluation and Capital outflow. At the same time, world trade still lack of powerful support, which make slow growth. Although the rebound of commodity prices or will bring some demand, but the magnitude is limited, global trade growth rate will remain lower than the economic growth. Global investment will be stronger due to USD raised, new trade protectionism and other factors, the recovery process is blocked. However, the rise of the fourth global industrial transfer, may lead to rebound in global investment. In addition, the Hangzhou G20 summit strong impetus to the global efficient financial governance which is good for developing countries and  inject new momentum for global economic growth.

The report notes that during the cyclical transformation of the world economy, China's five major development concepts will not only lead China's economic development, but also will lead the world economy into a new long-term positive kinetic energy. Globalization is at a crossroads in the transformation and incubation of the new cycle of the world economy. "One to one," the building tactics not only for the global economy out of the crisis haze, to realize powerful recovery and sustainable development provides new ideas, but also against the trend of globalization to promote economic globalization has injected new impetus and vitality.

In the future, Shinestar Group will take the opportunity to meet the challenges, and strive to develop themselves to produce more high-quality spiral submerged arc welded pipe, ERW steel pipe, stainless steel pipe, scaffolding, galvanized pipe and other products to develop China's economic.

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.

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.

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;