High Quality Hot Rolled Steel Plate: High Strength JIS ASTM SS400 Q355 Plate

 Grade Overview and Standards

SS400:

Standard: JIS G3101 (Japanese Industrial Standard) for general structural carbon steel.

Designation: "SS" = Structural Steel, "400" = Minimum tensile strength of 400 MPa.

Classification: Mild carbon steel with low alloy content, widely used for general construction and machinery.

Q355:

Standard: GB/T 1591-2018 (Chinese National Standard) for high-strength low-alloy (HSLA) structural steel.

Designation: "Q" = Yield Strength, "355" = Minimum yield strength of 355 MPa.

Grades: Q355B/C/D/E (differ by impact test temperature, e.g., Q355D: -20°C impact resistance).

 

Key Differences:

 

SS400: Pure carbon steel with no intentional alloying elements (low cost, basic strength).

Q355: Microalloyed with Nb, V, or Ti for higher strength and toughness without increased carbon content.

Mechanical Properties

Grade	Thickness (mm)	Yield Strength (≥MPa)	Tensile Strength (MPa)	Elongation (≥%, 5D)	Impact Test (Charpy V-Notch)
SS400	≤16	245	400–510	21	Not specified (optional)
Q355B	≤16	355	470–630	21	+20°C ≥27J
Q355D	≤16	355	470–630	21	-20°C ≥27J

 

Key Notes:

 

SS400: Suitable for non-critical structures (e.g., temporary buildings, simple brackets).

Q355: Ideal for high-load applications (e.g., bridges, cranes) due to superior yield strength and impact resistance.

 

 

 

 

. Applications

SS400 (JIS ASTM Equivalent)

General Construction: Building frames, roofing, and non-load-bearing walls.

Machinery Parts: Simple brackets, agricultural tools, and low-stress components.

Shipbuilding: Non-critical marine structures (e.g., interior hull plating).

Q355 (Chinese HSLA Steel)

Infrastructure: Bridges (e.g., Hong Kong-Zhuhai-Macao Bridge uses Q355D), high-rise buildings, and stadiums.

Heavy Machinery: Cranes, mining equipment, and wind turbine towers.

Industrial Equipment: Pressure vessels, pipelines, and steel structures in cold climates (Q355D/E for -20°C/-40°C resistance).

 Quality Assurance and Standards Compliance

SS400 Compliance:

ASTM A570 (equivalent to JIS SS400) for carbon steel plates.

Test reports include tensile strength, elongation, and chemical analysis.

Q355 Compliance:

GB/T 1591-2018 with mandatory impact tests for grades C/D/E.

Third-party certifications (e.g., CCS, BV, LR) available for international projects.

 

 

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All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
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