How to Detect the Quality of Spiral Steel Pipe Factory

Spiral steel pipe in the factory should do before the mechanical performance test and flattening test and flaring test, and to meet the requirements of the standard requirements. 

Spiral structural steel pipe quality testing methods are as follows:

1, From the surface to judge, that is, in the appearance of inspection. The appearance of the welded joint inspection is a simple procedure and a wide range of inspection methods, is an important part of the finished product inspection, mainly to find the weld surface defects and size of the deviation. Generally through the naked eye observation, with the standard model, gauge and magnifying glass and other tools for testing. If there is a defect on the surface of the weld, there may be a defect in the weld.

2, The physical method of inspection: the physical test method is the use of some physical phenomena for testing or testing methods. Materials or parts of the internal defects of the inspection, are generally used non-destructive testing methods. Non-destructive testing of ultrasonic testing, ray detection, penetration testing, magnetic detection and so on.

3, The strength of the pressure vessel test: pressure vessel, in addition to sealing test, but also for strength test. Commonly there are two kinds of hydraulic pressure test and air pressure test. They are able to test the weld densities of containers and pipes working under pressure. Pneumatic test is more sensitive and faster than hydraulic pressure test, while the product after the test without drainage, especially for difficult drainage products. But the risk of testing than the hydraulic test. During the test, the corresponding safety and technical measures must be observed to prevent accidents during the test.

4, Compactness test: the storage of liquid or gas welding containers, the weld is not dense defects, such as penetrating cracks, pores, slag, not penetration and loose tissue, etc., can be used to find the compact test. Densification test methods are: kerosene test, water test, water test and so on.

5, Hydrostatic test Each steel pipe should be hydrostatic test without leakage phenomenon, the test pressure by the test P = 2ST / D where the S-hydrostatic test test stress Mpa, hydrostatic test test stress by the corresponding The strip standard specifies 60% of the minimum yield. Regulator time: D <508 test pressure holding time of not less than 5 seconds; D ≥ 508 test pressure retention time of not less than 10 seconds.

6, Non-destructive testing of steel pipe welding seam, steel head weld and ring joints should be X-ray or ultrasonic testing. For helical welds of steel for combustible ordinary fluid delivery, a 100% SX-ray or ultrasonic test shall be carried out. The spiral welds of steel pipes for general fluid delivery such as water, sewage, air, heating steam shall be subjected to X-ray or Ultrasonic examination checks (20%).

According to the results of spiral carbon steel pipe inspection, spiral steel pipe is usually divided into three categories: qualified goods, rework and waste. Qualified refers to the appearance of quality and quality of the quality of the relevant standards or delivery acceptance of technical conditions of the spiral steel pipe; Refurbished goods refers to the appearance of quality and internal quality is not fully meet the standards and acceptance of the bar, but to allow rework, rework after the standard and acceptance conditions Of the spiral steel pipe; scrap refers to the appearance of quality and quality of the internal failure, does not allow rework or rework after still fail to meet the standard and acceptance conditions of the spiral steel pipe.

Waste is divided into two kinds of waste and waste. Internal waste refers to the waste steel pipe found in the foundry or foundry workshop. The waste material found after the delivery of the spiral steel pipe is usually exposed to mechanical processing, heat treatment or use. The economic loss caused by it is far Much larger than the inside. In order to reduce the external waste, batch production of spiral steel pipe in the factory before the best sampling test heat treatment and rough processing, as far as possible in the spiral steel pipe plant found in the potential spiral steel pipe defects in order to take the necessary early remedial instructions.

ASTM Standard

For the astm standard, different material with different steel grade,besides, their mechanical properties and chemical composition, metallurgical properties are all different.

There are list for astm standard with different steel grade.

ASTM A53 / A53M Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A106 / A106M Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A134 - 96 Standard Specification for Pipe, Steel, Electric-Fusion (Arc)-Welded (Sizes NPS 16 and Over)

ASTM A135 / A135M Standard Specification for Electric-Resistance-Welded Steel Pipe

ASTM A139 / A139M Standard Specification for Electric-Fusion (Arc)-Welded Steel Pipe (NPS 4 and Over)

ASTM A178 / A178M Standard Specification for Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes

ASTM A179 / A179M Standard Specification for Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes

ASTM A192 / A192M Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service

ASTM A210 / A210M Standard Specification for Seamless Medium-Carbon Steel Boiler and Superheater Tubes

ASTM A214 / A214M Standard Specification for Electric-Resistance-Welded Carbon Steel Heat-Exchanger and Condenser Tubes

ASTM A252 Standard Specification for Welded and Seamless Structural Steel Pipe Piles

ASTM A254 / A254M Standard Specification for Copper-Brazed Steel Tubing

ASTM A381 - 96(2012) Standard Specification for Metal-Arc-Welded Steel Pipe for Use With High-Pressure Transmission Systems

ASTM A423 / A423M Standard Specification for Seamless and Electric-Welded Low-Alloy Steel Tubes

ASTM A450 / A450M Standard Specification for General Requirements for Carbon and Low Alloy Steel Tubes

ASTM A498 / A498M Standard Specification for Seamless and Welded Carbon Steel Heat-Exchanger Tubes with Integral Fins

ASTM A500 / A500MStandard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes

ASTM A501 / A501M Standard Specification for Hot-Formed Welded and Seamless Carbon Steel Structural Tubing

ASTM A512Standard Specification for Cold-Drawn Buttweld Carbon Steel Mechanical Tubing

ASTM A513 / A513M Standard Specification for Electric-Resistance-Welded Carbon and Alloy Steel Mechanical Tubing

ASTM A519 Standard Specification for Seamless Carbon and Alloy Steel Mechanical Tubing

ASTM A523 Standard Specification for Plain End Seamless and Electric-Resistance-Welded Steel Pipe for High-Pressure Pipe-Type Cable Circuits

ASTM A524 Standard Specification for Seamless Carbon Steel Pipe for Atmospheric and Lower Temperatures

ASTM A530 / A530M Standard Specification for General Requirements for Specialized Carbon and Alloy Steel Pipe

ASTM A556 / A556M Standard Specification for Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes

ASTM A587 - 96Standard Specification for Electric-Resistance-Welded Low-Carbon Steel Pipe for the Chemical Industry

ASTM A589 / A589M Standard Specification for Seamless and Welded Carbon Steel Water-Well Pipe

ASTM A595 / A595M Standard Specification for Steel Tubes, Low-Carbon or High-Strength Low-Alloy, Tapered for Structural Use

ASTM A618 / A618M Standard Specification for Hot-Formed Welded and Seamless High-Strength Low-Alloy Structural Tubing

ASTM A671 / A671M Standard Specification for Electric-Fusion-Welded Steel Pipe for Atmospheric and Lower Temperatures

ASTM A672 / A672M Standard Specification for Electric-Fusion-Welded Steel Pipe for High-Pressure Service at Moderate Temperatures

ASTM A691 / A691M Standard Specification for Carbon and Alloy Steel Pipe, Electric-Fusion-Welded for High-Pressure Service at High Temperatures

ASTM A733 Standard Specification for Welded and Seamless Carbon Steel and Austenitic Stainless Steel Pipe Nipples

ASTM A787 / A787M Standard Specification for Electric-Resistance-Welded Metallic-Coated Carbon Steel Mechanical Tubing

ASTM A795 / A795MStandard Specification for Black and Hot-Dipped Zinc-Coated (Galvanized) Welded and Seamless Steel Pipe for Fire Protection Use

ASTM A822 / A822M Standard Specification for Seamless Cold-Drawn Carbon Steel Tubing for Hydraulic System Service

ASTM A847 / A847M Standard Specification for Cold-Formed Welded and Seamless High-Strength, Low-Alloy Structural Tubing with Improved Atmospheric Corrosion Resistance

ASTM A865 / A865M Standard Specification for Threaded Couplings, Steel, Black or Zinc-Coated (Galvanized) Welded or Seamless, for Use in Carbon Steel Pipe Joints

ASTM A972 / A972M Standard Specification for Fusion Bonded Epoxy-Coated Pipe Piles

ASTM A1020 / A1020M Standard Specification for Steel Tubes, Carbon and Carbon Manganese, Fusion Welded, for Boiler, Superheater, Heat Exchanger and Condenser Applications

ASTM A1024 / A1024MStandard Specification for Steel Line Pipe, Black, Plain-End, Seamless

ASTM A1037 / A1037M Standard Specification for Steel Line Pipe, Black, Furnace-Butt-Welded

ASTM A1065 / A1065M Standard Specification for Cold-Formed Electric-Fusion (Arc) Welded High-Strength Low–Alloy Structural Tubing in Shapes, with 50 ksi [345 MPa] Minimum Yield Point

ASTM A1076 / A1076MStandard Specification for Cold Formed Carbon Structural Steel Tubing Made from Metallic Precoated Sheet Steel

ASTM A1085 / A1085M Standard Specification for Cold-Formed Welded Carbon Steel Hollow Structural Sections (HSS)

ASTM A1097 Standard Specification for Steel Casing Pipe, Electric-Fusion (Arc)-Welded (Outside Diameter of 10 in. and Larger)

ASTM A1103 / A1103M Standard Specification for Seamless Cold-Finished Carbon Structural Steel Pipe for Automotive Racing Applications

The standard Index of Precision seamless tube

1) Precision Seamless main varieties: DIN Precision Series high precision seamless bright, dedicated precision seamless hydraulic system, automobile manufacturing special precision seamless tube.

2) Main standards: DIN2391, DIN2445, EN10305, DIN1629, DIN1630, ASTM A179

3) The main material precision seamless carbon steel pipe：ST35(E235) ST37.4 ST45(E255) ST52(E355)

4) The state of the main delivery：NBK(+N) GBK(+A) BK(+C) BKW(+LC) BKS(+SR)

5) Main features: precision seamless internal and external walls without the oxide layer, to withstand high pressure without leakage, high-precision, high finish, cold deformation, flaring, flattening without cracks

6) precision seamless steel pipe main purposes: used in the hydraulic system piping, piping automotive, military, engineering machinery, railway locomotive, aerospace, shipbuilding, injection molding machines, die-casting machines, machine tools, diesel, petrochemical, power plant, boiler equipment and other industries

API 5L PSL2 DSAW Steel Pipe

​DSAW steel pipe are manufactured of metal in-house produced and smelted in the electric furnace, treated with synthetic slags and cast by continuous casters. The applied steel making process ensures the achievement of chemically pure steel with reference to sulphur and phosphor contents providing high tensile, ductility and corrosion resistance properties of pipes to be operated at low temperatures in various corrosion media.

Rolling using a press piercing mill and continuous mill equipped with a fixed mandrel allows strict measurement tolerances to be obtained and ensures a lack of pipe body and surface defects.

In order to achieve high tensile and ductility steel as well as its required structure, providing a high corrosion resistance in various corrosion media, pipes are heat treated in a computerized walking beam furnace. 70% of oil line pipes are subject to heat treatment.

Pipes are inspected for internal and external flows by automatic non-distructive testing of ultrasonic and electromagnetic inspection. Carbon steel pipe ends inspection after beveling is done by magnetic-fluoroscopic flaw detection.

While manufacturing seamless line pipes ensures testing of corrosion-resistance properties through hydrogen included cracking method under NACE MR 02-84 and sulphide stress corrosion cracking method under NACE MR 01-77.

Participate in the "One Belt, One Road",Shinestar in action

Recently, the "One Belt, One Road" International Cooperation Forum in Beijing perfect ending, the forum aims to find solutions to face better solve the current global and regional economic issues, attracted attention around the world.As a service based on China, global procurement of steel integrated service providers, shinestar full attention to this dynamic forum.

It is reported that this forum is rich in content, including the forum opening ceremony, roundtable summit and the high level meeting of three most of the activities.President Xi jinping delivered a keynote speech titled "working together to promote the development of One Belt,One Road",the silk road spirit of peaceful cooperation, openness, inclusiveness, mutual learning, mutual benefit and win-win cooperation is the key to the development of the One Belt,One Road,we will establish the "One Belt,One Road" as a path of peace, prosperity, openness, innovation and civilization.

During the summit, the relevant departments of our country developed nearly 20 action plans with national counterparts along the line, involving infrastructure, energy resources, capacity cooperation, trade, investment and other fields.Today, with the development of economic globalization, the interests of various countries are closely linked, and international trade in steel is closely related.As everyone knows, the iron and steel industry is one of the key areas of international production cooperation, international cooperation is the production of iron and steel industry China seek to upgrade, an important way to promote the development of the world iron and steel industry healthy, iron and steel industry in the"One Belt,One Road"will undoubtedly promote the development of steel demand.

Then, the iron and steel industry in the end how to participate in the construction of the "One Belt,One Road"? Shinestar that will begin from the following three points:

First of all, we must keep going.Shinestar believes that China's iron and steel enterprises must combine their own actual situation, go out and explore a kind of industry chain cooperation model, establish the whole industrial chain alliance, and actively introducing foreign advanced technology and equipment.To completely copy the foreign model, we should gradually find out our own set of ways, not only to learn what others do well, but also to learn from other people's lessons.Shinestar as a force in the international steel market, steel's outstanding products have been exported to Europe, Africa, South America and other international markets, has been widely recognized by customers. We are looking forward to cooperate with more international customers to provide more quality products and services for them.

Secondly, we must adhere to the drive for independent innovation.The iron and steel industry to strengthen the development of institutional construction, accelerate the breakthrough technology bottleneck restricting the development of the industry, promote industry innovation and development, for the development of service innovation, to provide support for business model innovation and product innovation.In recent years shinestar has been increasing R & D investment and construction of professional personnel, in order to improve the intelligent level of R & D, production and service, through continuous technological innovation to develop their own.

Finally, we must grasp the quality and improve the quality of our products.Quality is the cornerstone of the brand, is the core of enterprise survival.Iron and steel enterprises will win the trust of consumers by laying down the quality foundation, thus winning the market.Good product quality is also an important factor in the healthy and sustainable development of international steel trade.In the future, shinestar will fully grasp the important opportunity of the "One Belt, One Road", and strive to develop their own, and constantly improve product quality, provide quality assurance for China's iron and steel industry to participate in international competition.

Iron and steel enterprises in China by only a few scattered opportunities are not enough, we want to go out and explore a kind of industry chain cooperation model, establish the whole industrial chain alliance. Shinestar think，it's a real walk out,that's what we're going to do.' We will also give good, do good amount, produce the high quality carbon steel pipe, welded steel pipe, line pipe, galvanized steel pipe, scaffolding, and other structural steel pipe , for China's steady and fast economic development in the relay.

How does the steel industry participate in "One Belt ， One Road"?

As carbon steel pipe, welded steel pipe, line pipe, galvanized steel pipe, scaffolding, and other products production services vendors, Shinestar think, remarkable "One Belt，One Road" all the way there is no doubt that will boost steel demand. So how does China's steel industry get involved in the country's "One Belt， One Road" construction?

At present, "One Belt ， One Road" international cooperation peak is being held in Beijing. The most fundamental purpose of the steel industry's participation in the "One Belt ， One Road" initiative is to promote mutual benefit. Some areas may require a lot of steel, but lack of production capacity and technology, so China can develop the steel industry locally. As a result, the steel industry in the region has been developed, and Chinese steelmakers have benefited from investment, which is mutually beneficial.

As the domestic and foreign markets become more and more connected, China's steel industry has become inseparable from the world in many ways. The steel industry is involved in "One Belt， One Road", and one important thing is international production capacity cooperation. International cooperation capacity to open market economy development the objective law, is a common and in-depth development of the global economy the important engine and the power, promoting the construction of "One Belt，One Road" is the important fulcrum. Iron and steel industry is one of the key areas of cooperation in the field of international production, international cooperation capacity and transformation and upgrading of China's iron and steel industry seeking, important way to promote the healthy development of the world steel industry.

In addition, steel companies have to go out and combine their own reality. For the time being, China has not been able to fully learn how to move abroad. We must gradually develop our own method, not only to learn what others do well, but also to learn from others.

Iron and steel enterprises to go out, no matter what way, want to consider first whether can achieve the purpose of mutual benefit and win-win results, conform to the interests and the interests of the enterprise of the industry, in compliance with local interests. Iron and steel enterprises to go out, no matter adopt what kind of mode, acquisition or investment cooperation factory, want to answer a question first: what this model can bring benefits? As a steel company, we should have a strategy of development of our company. Don't go out blindly.

Iron and steel enterprises in China by only a few scattered opportunities are not enough, we want to go out and explore a kind of industry chain cooperation model, establish the whole industrial chain alliance. Shinestar think，it's a real walk out,that's what we're going to do.' We will also give good, do good amount, produce the high quality carbon steel pipe, structural steel pipe, line pipe, galvanized steel pipe, scaffolding, and other products, for China's steady and fast economic development in the relay.

Spiral Pipe Weld Requirements Specification

Spiral carbon steel pipe into the steel unit, multi-channel roll rolling strip gradually rolled up, a gap is formed with an opening round tube, squeeze rollers reduction adjustment, the weld gap control at 1 ~ 3mm, and the weld ends flush.
1. If the gap is too large, resulting in reducing the proximity effect, eddy current lack of heat, weld crystal combined indirect adverse arising from lack of fusion or cracking.
2. The gap is too small, causing the proximity effect increases, excessive soldering heat, cause weld Burning; weld or extruded, rolled after the formation of the pit, affecting the quality of the weld surface.

After the two edges of the tube is heated to welding temperature in the extrusion of squeeze rollers form a common metal grain mutual penetration, crystallization, eventually forming a strong weld. If the structural steel pipe extrusion pressure is too small to form a common crystal number is small, the weld metal strength is reduced by the force will produce cracking; if the pressing force is too large, will make the molten metal is extruded weld, not only reduced weld strength, and will generate a lot of internal and external burrs, and even cause welding take sewing and other defects.