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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

OEM&ODM

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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cape verde STEEL HOLLOW SECTIONS

cape verde HOT DIP GALVANIZED STEEL PIPE

cape verde Detailed Description Of JIS G3101

JIS G3101 Type: Plate/sheet, Strip in coil, Section, Flat and Bar, Circular, Rectangular, Square Hollow Section(CHS,RHS,SHS) Grades: SS330, SS400, SS490, SS540 Outside Diameter: 1/2 INCH - 24 INCH(CHS) 20MM × 20MM - 1200MM × 1200MM(SHS) 20MM × 30MM - 1000MM × 1500MM(RHS) Wall Thickness: 1.3MM - 22MM(CHS) 1.3MM - 50MM(SHS,RHS) Length: Commonly used 5.8M, 6M, 12M, but we can also produces depends on client's requirement. Coating: Black paint, Varnish, Anti-rust oil. Applications: Construction, Mechanical Engineering, Shipbuilding, Automotive Industry.

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cape verdeSTEEL HOLLOW SECTIONS

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Product Description

Overview
JIS G3101 is a Japanese Industrial Standard that specifies the requirements for hot-rolled steel products used in general structural applications. This standard covers various steel grades, including SS330, SS400, SS490, and SS540, which are widely used in construction, bridges, ships, and machinery. The standard outlines key specifications for these steel grades, such as chemical composition, mechanical properties, and dimensions.

Shape, Dimensions, Mass, And Tolerances
The standard details the permissible deviations in shape, dimensions, and mass for different types of steel products. These tolerances are crucial for ensuring that the steel meets the required specifications for structural applications.

Common Steel Grades
SS330: Known for its good formability and weldability, suitable for general structural applications and building components.
SS400: The most commonly used grade, offering a balanced combination of strength and ductility, with good weldability and processing properties.
SS490: Provides higher tensile and yield strength compared to SS400, suitable for heavy machinery components and high-stress applications.
SS540: Characterized by superior tensile strength (minimum 540 MPa) and excellent weldability, ideal for automotive structural components and heavy-duty construction projects.

Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Key Characteristics	Common Applications
SS330	≥205	330–430	Low strength, good formability	Light structures, general use
SS400	≥245	400–510	Moderate strength, balanced properties	Most widely used for construction, machinery
SS490	≥285	490–610	Higher strength, slightly reduced ductility	Heavier structures, load-bearing components
SS540	≥390	540–640	High strength, requires controlled welding	Heavy-duty construction, bridges

Key Differences:
● SS330 vs. SS400: SS400 has higher tensile/yield strength but similar weldability.

● SS400 vs. SS490: SS490 offers better load-bearing capacity but may need preheating for welding.

● SS540: Requires stricter welding procedures due to higher carbon equivalent.

Most Commonly Used Steel Grade: SS400
● SS400 Steel meaning: SS is the abbreviation of Steel Structure, 400 means that the tensile strength is ≥ 400 MPa.

Chemical Composition
The following table shows JIS SS400 steel chemical composition, please note that the carbon (C) content is not specified in JIS G3101, only the phosphorus (P) and sulfur (S) content.

Chemical Composition, %
Country (Region)	Standard	Steel Grade	Carbon (C)	Manganese (Mn)	Phosphorus (P)	Sulfur (S)
Japan	JIS G3101	SS400	–	–	≤0.05	≤0.05

Mechanical Properties
SS400 steel exhibits the following mechanical properties:

Standard

Steel

Yield strength (≥, MPa); Steel thickness (t) in mm.

Tensile Strength (MPa)

Steel thickness (t) in mm.

Test piece

Elongation (≥, ％)

Bendability

t≤16

>100

Bending angle

Inter radius

Test piece

JIS G3101

SS400

245

235

215

205

400-510

plates and sheets, steel strip in coils, flats and sections, t≤5

No. 5

180°

1/2 thickness

No. 1

plates and sheets, steel strip in coils, flats and sections, 5

NO. 1A

plates and sheets, steel strip in coils, flats and sections, 16

NO. 1A

plates and sheets, steel strip in coils, flats and sections, t>40

No. 4

side or distance across flats of steel bars ≤25

No. 2

180°

1.5 x diameter, side, or distance across flats

No. 2

side or distance across flats of steel bars >25

No. 14A

SS400 is a structural carbon steel grade defined under JIS G3101. It is widely used across various industries due to its excellent weldability, machinability, and balanced mechanical properties.

SS400 is suitable for applications requiring moderate strength and ductility, such as building structures, bridges, machinery parts, and shipbuilding.

Manufacturing Process And Tests
Manufacturing Process
● Hot Rolling: The steel is produced by hot rolling at high temperatures to achieve the desired thickness and mechanical properties.

Raw Material Preparation: Iron ore, scrap steel, and alloying elements are prepared.
Melting and Refining: The raw materials are melted in a furnace, and impurities are removed.
Hot Rolling: The molten steel is rolled into desired shapes (e.g., plates, sheets) at high temperatures.
Cooling and Heat Treatment: The steel is cooled and may undergo heat treatment processes like annealing or quenching and tempering to enhance its mechanical properties.

Testing And Inspection
Tensile Test: Conducted to verify yield strength, tensile strength, and elongation.
Bend Test: Required to assess ductility (for certain applications).
Impact Test: Not mandatory unless specified by the purchaser.

Conclusion
JIS G3101 is a comprehensive standard that ensures the quality and consistency of rolled steels for general structural use. It provides detailed specifications for chemical composition, mechanical properties, dimensions, and testing methods, making it a crucial reference for manufacturers and users of structural steel products.