Q370Q is a high-strength low-alloy steel plate with excellent strength, toughness, and weldability. It is suitable for boilers, pressure vessels, petrochemical equipment, and load-bearing components. The steel maintains good impact toughness at low temperatures, meeting domestic and international pressure vessel standards.

Standard

GB/T 1591 / GB/T 3274

Grade: Q370Q

Comparable foreign standards: ASTM A516 Grade 70 / EN 10028-2 P355NL2

Chemical Composition (%)

Element	Q370Q
C	≤ 0.22
Si	0.17 – 0.37
Mn	1.20 – 1.60
P	≤ 0.035
S	≤ 0.035
Ni	≤ 0.30
Cr	≤ 0.30
Mo	/

Note: Composition can be customized upon request, with Mill Test Certificate (MTC) provided.

Mechanical Properties

Item	Q370Q
Yield Strength	≥ 370 MPa
Tensile Strength	540 – 690 MPa
Elongation	≥ 21%
Impact Toughness	-20°C ≥ 34 J

Available Specifications

Thickness: 6 mm – 80 mm

Width: 1,500 mm – 3,500 mm

Length: 6,000 mm – 12,000 mm or customized

Delivery Condition: Hot Rolled / Normalized

Surface: Black surface, sand blasted, oiled, anti-rust treated

Applications

Boilers and pressure vessels

Petrochemical equipment and pipelines

Chemical machinery and load-bearing components

Ports, ships, and large industrial equipment

Product Advantages

High strength and excellent load-bearing capacity

Excellent toughness and weldability

Superior low-temperature impact toughness

Stable chemical composition and mechanical properties

Compliant with domestic and international pressure vessel steel standards

Quality & Delivery

Mill Test Certificate EN10204 3.1 / 3.2 available

Third-party inspection supported (SGS / BV / TUV, etc.)

Custom cutting and ultrasonic testing (UT) available

Qualification

Strength

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