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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. -
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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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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.
Armenia JIS G3466 STKR400 Carbon Steel Tubes
Category:
Product Description
Overview
JIS G 3466 is a Japanese Industrial Standard that specifies the requirements for carbon steel tubes used primarily in machine structural applications. The standard covers seamless and welded tubes intended for mechanical and structural components in machinery, automobiles, and general engineering.
● The STKR400 grade under this standard denotes a carbon steel tube with a minimum tensile strength of 400 MPa, making it suitable for medium-strength structural applications.
● JIS G3466 STKR400 Carbon Steel Tubes
Specification:
OD: 20MM × 20MM - 1200MM × 1200MM (SHS); 20MM × 30MM - 1200MM × 1500MM (RHS)
WT: 1.3MM - 50MM
Length: Commonly used 5.8M,6M,12M,or as your requirement
Surface Treatments: Coating, Hot-dip galvanized, Painting
Application: General machinery parts, Automotive components, Construction equipment, Industrial machinery
Chemical Composition And Mechanical Properties
Chemical Composition (STKR400)
The chemical composition of STKR400 must comply with the following requirements (typical values):
Element | Composition (%) (Max) |
|---|---|
| Carbon (C) | ≤ 0.25 |
| Silicon (Si) | - |
| Manganese (Mn) | - |
| Phosphorus (P) | ≤ 0.040 |
| Sulfur (S) | ≤ 0.040 |
(Note: Exact limits may vary slightly depending on manufacturing processes.)
Mechanical Properties (STKR400)
Property | Requirement |
|---|---|
| Tensile Strength (MPa) | ≥ 400 |
| Yield Strength (MPa) | ≥ 245 |
| Elongation (%) | ≥ 23 (based on specimen dimensions) |
These properties ensure good formability, weldability, and structural integrity for mechanical applications.
Manufacturing Process
Seamless Tubes: Produced by hot-rolling or cold-drawing without welding.
Welded Tubes: Made by electric resistance welding (ERW) or other welding methods, followed by heat treatment if required.
Applications And Advantages
Applications
STKR400 tubes are commonly used in:
● Automotive parts (chassis, frames)
● Construction machinery (booms, arms)
● General mechanical structures (supports, brackets)
● Industrial equipment (conveyors, hydraulic systems)
Advantages
● High Strength: Capable of withstanding high loads and providing structural stability.
● Excellent Weldability: The low carbon content ensures good weldability, making it easy to join with other steel components.
● Cost-Effective: Offers a balance of strength and cost, making it suitable for a wide range of applications.
Comparison With Other Grades
Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Key Features |
|---|---|---|---|
| STKR400 | ≥ 400 | ≥ 245 | Balanced strength & formability |
| STKR490 | ≥ 490 | ≥ 325 | Higher strength, less ductile |
Testing & Inspection
Tubes must undergo:
● Tensile testing
● Flattening test / Flaring test (for ductility)
● Hydrostatic or non-destructive testing (NDT) for leaks/defects
Conclusion
JIS G 3466 STKR400 is a medium-strength carbon steel tube suitable for structural and mechanical applications requiring good weldability and formability. It is widely used in Japan and internationally for automotive and industrial components.
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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