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Tianjin Lefin Industrial Co.,Ltd

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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Tianjin Lefin Industrial Co.,Ltd.

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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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.

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Guinea HOT DIP GALVANIZED STEEL PIPE

Guinea JIS G3444 STK490 TUBE

JIS G3444 STK490 Tube Standard: JIS G3444 Grade: STK290, STK400, STK490, STK500, STK540 Method Of Manufacture: Seamless, Butt-welding, ERW and Arc welding process Outside Diameter: SSAW 219MM - 4084MM LSAW 406MM - 1420MM ERW 20MM - 660MM Wall Thickness: 7.75 - 25.4MM(SSAW), 10 - 50MM(LSAW), 1.3 - 16MM(ERW) Length: Commonly used 5.8M, 6M, 12M, also depends on the requirements Advantages: High Strength, Durability, Easy to Fabricate. Application: Transportation water, Construction industry, energy industry.

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Product Description

Basic Information
STK490 conforms to the Japanese Industrial Standards (JIS) G3444, ensuring that it meets specific quality and performance criteria. This standard covers the dimensions, tolerances, and mechanical properties of the steel tubes.

In the JIS G3444 standard, which specifies carbon steel tubes for general structural purposes, the relatively common steel grades are STK290, STK400, STK490, STK500, and STK540. Among these, STK490 is one of the more frequently used grades due to its balanced properties of strength and weldability.

JIS G3444 STK490 Tube
Standard: JIS G3444
Grade: STK290, STK400, STK490, STK500, STK540
Method Of Manufacture:
Seamless, Butt-welding, ERW and Arc welding process
Outside Diameter:
SSAW 219MM - 4084MM
LSAW 406MM - 1420MM
ERW 20MM - 660MM
Wall Thickness: 7.75 - 25.4MM(SSAW), 10 - 50MM(LSAW), 1.3 - 16MM(ERW)
Length: Commonly used 5.8M, 6M, 12M, also depends on the requirements
Advantages: High Strength, Durability, Easy to Fabricate.
Application: Transportation water, Construction industry, energy industry.
Chemical Composition

Element	Maximum %
Carbon (C)	0.18
Silicon (Si)	0.55
Manganese (Mn)	1.65
Phosphorus (P)	0.035
Sulfur (S)	0.035

Carbon (C): The primary strengthening element. Higher carbon content increases strength and hardness but reduces weldability and ductility. STK490's moderate carbon content ensures a balance between strength and formability.

Manganese (Mn): Enhances strength and toughness while improving hardenability. It also helps refine the grain structure, improving overall mechanical properties.

Silicon (Si): Improves strength and oxidation resistance. It also aids in deoxidation during steel production, reducing impurities.

Phosphorus (P) and Sulfur (S): These are residual elements kept at low levels to avoid brittleness and reduce the risk of cracking during welding or forming.
Mechanical Properties

Property	Value (Typical)	Significance
Tensile Strength	490 MPa (minimum)	Tensile strength is the maximum stress the material can withstand while being stretched or pulled before breaking. STK490's tensile strength of 490 MPa makes it suitable for load-bearing structures.
Yield Strength	325 MPa (minimum)	Yield strength is the stress at which the material begins to deform plastically. A yield strength of 325 MPa ensures the steel can withstand significant loads without permanent deformation.
Elongation	20% - 25%	Elongation measures the ductility of the material, or its ability to stretch before breaking. STK490's elongation of 20-25% indicates good formability and toughness.
Hardness	140 - 180 HB	Hardness is a measure of the material's resistance to deformation. STK490's moderate hardness ensures it is strong enough for structural use while remaining machinable and weldable.
Impact Toughness	≥ 27 J (at 20°C)	Impact toughness measures the material's ability to absorb energy during sudden loading. STK490's toughness ensures it can withstand dynamic loads and shocks.

Tensile Strength and Yield Strength: These properties ensure that STK490 can withstand significant loads without failure, making it ideal for structural applications like building frames, bridges, and machinery.

Elongation: High elongation indicates good ductility, allowing the material to deform under stress without breaking. This is crucial for structures subjected to dynamic or impact loads.

Hardness: Moderate hardness ensures the material is strong enough for structural use while remaining workable and weldable.

Impact Toughness: STK490's ability to absorb energy during sudden loading makes it suitable for applications where shock resistance is important.
Comparison With Other Grades
STK400: STK490 offers higher tensile and yield strength compared to STK400, making it more suitable for applications requiring greater load-bearing capacity.
STK500: While STK500 has higher strength, STK490 provides better weldability and formability, making it more versatile for various structural applications.
Advantages And Applications

Advantages：

● High Strength: With a tensile strength of at least 490 MPa, STK490 is suitable for demanding structural applications.

● Good Weldability: The controlled chemical composition ensures excellent weldability, facilitating ease of fabrication.

● Ductility: Adequate elongation properties allow for deformation without fracture, enhancing safety in structural applications.

● Cost-Effective: Provides a good balance between performance and cost, making it a preferred choice for many industries.

Applications：

STK490 is extensively used in:

● Construction: For building frameworks, bridges, and other infrastructure.

● Automotive: In chassis and structural components.

● Machinery: For manufacturing heavy machinery and equipment.

● General Structural Purposes: In various engineering applications requiring high strength and durability.

STK490 under JIS G3444 is a high-strength, versatile steel grade with excellent mechanical properties and weldability. Its balanced chemical composition and robust performance make it a preferred choice for a wide range of structural applications, offering a cost-effective solution without compromising on strength and durability.