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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.
poland JIS G3444 STK500 SCAFFOLDING PIPE
Category:
Product Description
brief introductions
Standared:JIS G3444
Grades:STK500
Other Standards: BS EN 10210 (Europe) BS EN 10219 (Europe)
ASTM A500 (American)
GB/T 3094-2000 (China) GB/T 6728-2002 (China)
JIS G3466 (Japan)
AS 1163 (Australia)
Corner Type: Radius Corner, Sharp Angle Corner, Right Angle Corner
Application: Heavy steel structure, Aerospace Engineering, High-speed rail, Shipbuilding, For machinery, For automobiles and high-speed trains, For chemical industry and boiler, For bridge.
Outside diameter: (SHS)20*20-1200*1200mm Wall Thickness: 1.3mm-50mm
Outside diameter: (RHS)20*30-1200*1500mm Wall Thickness:1.2-50mm
Length:4m, 6m, 12m or as your required
Brand: LEFIN STEEL
Chemical Composition
CHEMICAL COMPOSITION OF JIS G3444,%MAX | |||||
GRADE | C | Si | Mn | P | S |
STK 400 | 0.25%MAX | - | - | 0.04%MAX | 0.04%MAX |
STK 500 | 0.24%MAX | 0.35%MAX | 0.3-1.3 | 0.04%MAX | 0.04%MAX |
Physical requirements
MECHANICAL PROPERTIES OF JIS G3444 | ||||||
GRADE | Tensile Strength N/mm2 | Yield Point or Proof Stress N/mm2 | Weld Tensile N/mm2 | Flattening Resistance Strength | Bendability |
|
Distance between Flat Plates (H) | Bending Angle, a) | Inside Radius | ||||
Applicable Outside Diameter | ||||||
All Outside Diameters | All Outside Diameters | All Outside Diameters | All Outside Diameters | 50 mm or under | ||
STKR 400 | 400min | 235min | 400min | 2/3D | 90° | 6D |
STKR 500 | 500min | 355min | 500min | 7/8D | 90° | 6D |
JIS G3444 STK500 SCAFFOLDING PIPE
JIS G3444 Standard overview
• JIS G3444 is a technical specification for carbon steel tubes for general structural use in the Japanese Industrial Standard (JIS), the latest version is JIS G3444:2015. The standard specifies the chemical composition, mechanical properties, dimensional tolerances, detection methods and other requirements of the steel pipe, and is suitable for construction, machinery, scaffolding and other structural purposes.
STK500, one of the material grades defined in the standard, is a high-strength carbon steel designed for load-bearing structures, especially for Scaffolding pipes.
Material characteristics
Chemical Composition
• Carbon (C) : ≤0.24%
• Silicon (Si) : ≤0.35%
• Manganese (Mn) : 0.3%-1.3%
• Phosphorus (P), sulfur (S) : both ≤0.04%.
Mechanical properties
• Tensile strength: ≥500 MPa
• Yield strength: ≥355 MPa
• Elongation (δ5) : ≥17%
• Hardness (HBS) : 123-321.
• Corrosion resistance: formed by Black Annealing (Black Annealing) oxidation layer, with a certain anti-corrosion ability.
Dimensions and tolerances
• Outer diameter range: common 48.6mm (standard scaffold tube size), other specifications can be customized to 610mm.
• Wall thickness: Typically 1.8-2.3mm, about 25% less weight than traditional scaffolding tubes (such as STK500).
• Length: Usually 5.8-6.5m, supporting fixed size cutting.
• Tolerance requirements: Outer diameter ±0.5%, wall thickness ±10%.
Application Fields
Construction scaffolding: As a temporary support structure, STK500 steel pipe significantly improves construction safety and efficiency due to its high strength and lightweight characteristics.
• Mechanical manufacturing: Used for mechanical frames, conveying systems and other load-bearing parts.
• Infrastructure: railway guardrail, bridge support and other scenes requiring weather resistance and pressure resistance.
• International projects: exported to New Zealand, Vietnam and other places for mining, water transmission and other projects.
Production and testing
• Production process: High frequency straight seam resistance welding (ERW) or seamless process, combined with black annealing treatment to optimize toughness.
• Testing standards: including X-ray inspection, ultrasonic inspection, hydraulic test, etc., to ensure compliance with JIS G3444, EN10219, API 5L and other international standards.
• Certification requirements: Japan JIS certification and EU PED, Singapore FPC and other international certifications.
Comparison with other materials
• STK500 vs. STK400/STK490:
The STK500 has a significantly higher tensile strength (500MPa) than the STK400 (400MPa) and STK490 (490MPa), which is suitable for higher load scenarios.
• With traditional scaffolding pipe: using thin wall design (1.8mm) to reduce weight, while improving toughness through heat treatment, the overall performance is better than ordinary carbon steel pipe.
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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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