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Brief description
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.
JIS G3101 also provides detailed requirements for dimensions, mass, and permissible variations of steel products, ensuring consistency and quality in manufacturing. The standard is applicable to steel plates, sheets, strips, and sections, with specific dimensions and tolerances defined for each type.
Overall, JIS G3101 plays a crucial role in the steel industry by providing a standardized framework for the production and application of structural steel products.
Basic Information
JIS G3101 Steel Product
Type: Plate/sheet, Strip in coil, Section, Flat and Bar,
Circular Hollow Section(CHS) ,Rectangular Hollow Section(RHS), Square Hollow Section(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.
Common Process:
ERW: 20MM - 660MM (OD) Wall Thickness: 1.3MM - 50MM
SSAW: 219MM - 4084MM (OD) Wall Thickness: 7.75MM - 25.4MM
Coating: Black paint, Varnish, Anti-rust oil.
Applications: Construction, Mechanical Engineering, Shipbuilding, Automotive Industry.
Chemical composition
| Chemical composition, % | ||||
| Symbol of grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
| SS330 | _ | _ | ≤0.050 | ≤0.050 |
| SS400 | ||||
| SS490 | ||||
| SS540 | ≤0.30 | ≤1.60 | ≤0.040 | ≤0.040 |
| Elements in the table with no limit values or elements notgiven in the table may be added as necessary. | ||||
SS330: Typically has a lower carbon content, making it more ductile and suitable for general structural applications.
SS400: Contains a balanced amount of carbon and manganese, providing good strength and ductility.
SS490: Higher manganese content compared to SS400, resulting in increased tensile strength and hardness.
SS540: Contains higher levels of carbon and manganese, offering superior tensile strength and load-bearing capabilities.
Mechanical properties
| Mechanical properties | |||||||||||
| Symbol of grade |
Yield pointor proof strength N/mm² |
Tensile strength N/mm² |
Elongation | Bendability | |||||||
| Thickness a) mm |
Thickness a) mm |
Test piece |
% | Bending angle |
Inner radius |
Test piecec) |
|||||
| ≤16 | >16 ≤40 |
>40 ≤100 |
>100 | ||||||||
| SS330 | >205 | >195 | >175 | >165 | 330 to 430 |
≤5 in thickness of plates/sheets,strips in coil and flats |
No.5 | ≥26 | 180° | 0.5x thickness |
No.1 |
| >5≤16 in thickness of plates/sheets,strips in coil and flats |
No.1A | ≥21 | |||||||||
| >16≤50 in thickness of plates/sheets,strips in coil and flats |
No.1A | ≥26 | |||||||||
| >40 in thicknessof plates/sheets and flats |
No.4 | ≥28 b) |
|||||||||
| ≤25 in diameter or distance across flats of bars |
No.2 | ≥25 | 180° | 0.5x diameter or distance across flats |
No.2 | ||||||
| >25 in diameter or distance across flats of bars |
No.14A | ≥28 | |||||||||
| SS400 | >245 | >235 | >215 | >205 | 400 to 510 |
≤5 in thickness of plates/sheets,strips in coil,flats and sections |
No.5 | ≥21 | 180° | 1.5x thickness |
No.1 |
| >5≤16 in thickness of plates/sheets,strips in coil,flats and sections |
No.1A | ≥17 | |||||||||
| >16≤50 in thickness of plates/sheets,strips in coil,flats and sections |
No.1A | ≥21 | |||||||||
| >40 in thickness of plates/sheets,flats and sections |
No.4 | ≥23 b) |
|||||||||
| ≤25 in diameter or distanceacross flats of bars |
No.2 | ≥20 | 180° | 1.5x diameter or distance across flats |
No.2 | ||||||
| >25 in diameter or distance across flats of bars |
No.14A | ≥22 | |||||||||
| SS490| | >285 | >275 | >255 | >245 | 490 to 610 |
≤5 in thickness of plates/sheets,strips in coil,flats and sections |
No.5 | ≥19 | 180° | 2.0x thickness |
No.1 |
| >5≤16 in thickness of plates/sheets,strips in coil,flats and sections |
No.1A | ≥15 | |||||||||
| >16≤50 in thickness of plates/sheets,strips in coil,flats and sections |
No.1A | ≥19 | |||||||||
| >40 in thickness of plates/sheets,flats and sections |
No.4 | ≥21 b) |
|||||||||
| ≤25 in diameter or distanceacross flats of bars |
No.2 | ≥18 | 180° | 2.0x diameter or distance across flats |
No.2 | ||||||
| >25 in diameter or distanceacross flats of bars |
No.14A | ≥20 | |||||||||
| SS540 | >400 | >390 | >540 | ≤5 in thickness of plates/sheets,strips in coils,flatsand sections |
No.5 | ≥16 | 180° | 2.0x thickness |
No.1 | ||
| >5≤16 in thickness of plates/sheets,strips in coil,flats and sections |
No.1A | ≥13 | |||||||||
| >16≤40 in thickness of plates/sheets,strips in coil,flats and sections |
No.1A | ≥17 | |||||||||
| ≤25 in diameter or distanceacross flats of bars |
No.2 | ≥13 | 180° | 2.0x diameter or distance across flats |
No.2 | ||||||
| >25≤40 in diameter or distanceacross flats of bars |
No.14A | ≥16 | |||||||||
- SS330 is known for its moderate strength and good ductility, making it suitable for general structural applications.
- SS400 is a versatile structural steel with a balance of strength and ductility, widely used in construction, bridges, and mechanical equipment.
- SS490 offers higher strength and ductility, making it suitable for heavy-duty applications such as construction and automotive components.
- SS540 is a high-strength steel with excellent load-bearing capabilities, often used in large-scale construction projects and automotive structural components.
These mechanical properties collectively define the suitability of each grade for specific applications, with higher strength grades like SS490 and SS540 being preferred for more demanding structural requirements.
Production Process
- 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.
Advantages and Application
SS330
Advantages:
SS330 is known for its good formability and weldability, making it suitable for applications that require extensive shaping and joining processes. Its relatively low carbon content ensures ease of fabrication.
Applications:
- General structural applications.
- Building components such as Beams and Columns.
- Machinery parts that require moderate strength.
SS400
Advantages:
SS400 offers a balanced combination of strength and ductility. It is highly regarded for its good plasticity, welding performance, and processing properties, making it versatile for various applications. Its mechanical properties ensure reliable performance in structural applications.
Applications:
- Construction of bridges, Buildings, and Ships.
- Automotive components.
- General structural applications where moderate strength and good weldability are required.
SS490
Advantages:
SS490 provides higher tensile strength and yield strength compared to SS400, making it suitable for applications that require greater load-bearing capabilities. It also exhibits good toughness and weldability.
Applications:
Heavy machinery components.
Structural steel for high-stress applications.
Construction of bridges and other infrastructure projects.
SS540
Advantages:
SS540 is characterized by its superior tensile strength (minimum 540 MPa) and excellent weldability. Its high strength-to-weight ratio makes it an ideal choice for applications requiring high durability and resistance to deformation.
Applications:
Automotive structural components.
Heavy-duty construction projects.
Structural steel sections and pipes.
The JIS G3101 steel grades (SS330, SS400, SS490, and SS540) are widely used in various industries due to their balanced mechanical properties and versatility. Each grade offers specific advantages tailored to different application requirements, ranging from general structural use to high-strength applications in construction and automotive industries.
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