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About us
Tianjin lefin Industrial
TIANJIN LEFIN STEEL GROUP containing Tianjin lefin Industrial Co.,Ltd. 、Tianjin lefin steel import & export Co.,Ltd and Tianjin Shengqifeng International Trading Co., Ltd. -
Products
Steel Pipe Processing
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard -
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Service Capability
Guarantee Quality
Our steel pipes are suitable for oil, natural gas, shipbuilding, chemical industry, water conservancy, electrical, steel structure, construction and other related fields.
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Our main products include 1/2inch to 16 inch ERW PIPE/GI PIPE which has been produced according to BS1387/ASTM A53/EN10219/EN10255/EN10217 Standard
Has rich experience in steel pipe processing, can be customized according to customer requirements according to the drawing and sample processing, assist in the development of new products.
Product Description
Brief Introduction
ASTM A501 GR.B TUBE
Size: Square Tube: 20MM * 20MM - 1200MM * 1200MM
Rectangular Tube: 20MM * 30MM - 1500MM * 1200MM
Wall Thickness: 1.3MM - 50MM
Length: 1M - 12M, normally 5.8M, 6M, 12M, also depends on the requirements.
Surface Treatment: Galvanizing, Black vanish, Carving, Slightly oil painting, PVC clothes cover each bundle etc.
Application: Bolted construction of bridges and buildings, as well as for General structural purposes.
Chemical Composition
| COMPOSITION, % | |||
| GRADE A | GRADE B,C | ||
| HEAT ANALYSIS | PRODUCT ANALYSIS | HEAT ANALYSIS | PRODUCT ANALYSIS |
Carbon(C),max | 0.26 | 0.30 | 0.22 | 0.26 |
Manganese(Mn),max | no requirement | no requirement | 1.40 | 1.45 |
Phosphorus(P),max | 0.035 | 0.045 | 0.030 | 0.040 |
Sulfur(S),max | 0.035 | 0.045 | 0.020 | 0.030 |
Copper(Cu),min | 0.20 | 0.18 | 0.20 | 0.18 |
Carbon (C): Lower carbon content compared to Grade C enhances weldability and reduces the risk of cracking during welding.
Manganese (Mn): Manganese improves strength and toughness, making the material more durable.
Phosphorus (P): Lower phosphorus content reduces the risk of brittleness and improves overall material quality.
Sulfur (S): Lower sulfur content enhances the material's ductility and reduces the risk of cracking.
Copper (Cu): Copper can improve corrosion resistance in certain environments.
Physical Requirements
ASTM A501 Tensile and Impact Requirements | |||||||
| Wall Thickness | GRADE A | GRADE B | GRADE C | |||
TENSILE STRENGTH,min | All | 58000psi | 400MPa | 65000psi | 448MPa | 70000psi | 483MPa |
| WT≤25mm | 39000psi | 270MPa | 46000psi | 315MPa | 50000psi | 345MPa |
| 25mm＜WT≤50mm | 38000psi | 260MPa | 45000psi | 310MPa | 49000psi | 340MPa |
YIELD STRENGTH，min | 50mm＜WT≤76mm | 36500psi | 250MPa | 42500psi | 290MPa | 47500psi | 330MPa |
| 76mm＜WT≤100mm | 35000psi | 240MPa | 40000psi | 280MPa | 46000psi | 315MPa |
ELONGATION,min |
| 25% | 24% | 23% | |||
Tensile Strength: Minimum 65,000 psi (448 MPa). This high tensile strength ensures that the material can withstand significant loads without breaking.
Yield Strength: Minimum 46,000 psi (315 MPa) for wall thicknesses ≤ 1 inch (25 mm). The yield strength indicates the material's ability to deform elastically before plastic deformation occurs.
Elongation: Minimum 24%. This elongation value ensures that the material has good ductility, allowing it to be formed and bent without cracking.
Production Process
1.Raw Material Preparation: Steel is produced using basic-oxygen or electric-arc-furnace methods, ensuring it meets the chemical composition requirements for Grade B.
2.Tubing Formation: The steel is formed into tubes using methods such as seamless rolling, electric resistance welding (ERW), or submerged arc welding (SAW). The tubes are then hot-formed to achieve the desired shape and size.
3.Heat Treatment: For thicker-walled tubes (over 13 mm), normalizing heat treatment may be applied to ensure uniform mechanical properties.
4.Testing and Inspection: The tubes undergo chemical and mechanical testing to verify compliance with ASTM A501 Grade B standards. Surface quality checks and repairs are also performed.
5.Finishing: The final product may be coated for corrosion protection and marked with essential identification details.
Address: Hengtai Road,Daqiuzhuang Town,Jinghai County,Tianjin,China
Mob: +8615122229899(whatspp)
Phone: +86 22 58171905
Fax: +86 22 58171902
E-mail:info@lefinsteel.com
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