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Q345C for zero degree state
Q345C Steel – Optimized for 0°C Low-Temperature Service
Product Overview:
Q345C is a low-alloy high-strength structural steel grade defined under the Chinese GB/T 1591 standard, with enhanced performance for low-temperature environments. It offers an ideal balance of strength, toughness, and weldability, and is specifically suitable for projects requiring stable performance at temperatures as low as 0°C.
As a “C” grade, Q345C undergoes impact testing at 0°C, ensuring improved cold weather toughness compared to Q345B. It is widely used in steel structures, bridges, pressure vessels, ships, and low-temperature industrial environments.
Technical Specifications:
Standard: GB/T 1591
Grade: Q345C
Delivery Condition: Hot rolled, normalized, or TMCP
Thickness Range: 6 mm – 100 mm
Width & Length: Customizable per customer needs
Mechanical Properties:
Property | Value (Typical) |
---|---|
Yield Strength (MPa) | ≥ 345 MPa (≤16mm) |
Tensile Strength (MPa) | 470–630 MPa |
Elongation (%) | ≥ 21% |
Charpy Impact Energy | ≥ 27 J @ 0°C |
Weldability | Good (low carbon equivalent) |
Element | C | Si | Mn | P | S |
---|---|---|---|---|---|
% | 0.20 | 0.50 | 1.70 | 0.035 | 0.035 |
Advantages:
Reliable impact resistance at 0°C for cold-region projects
Good weldability and formability for fabrication
High strength-to-weight ratio for efficient structural design
Cost-effective alternative to imported low-temp steels
Certified under GB/T 1591 and widely used in structural design codes
Applications:
Cold-region steel structures and bridges
Offshore platforms and port equipment
Pressure vessels operating near freezing point
Wind tower components
LNG, chemical, and oil storage facilities
Quality Assurance:
Mill test certificate (MTC) per GB/T 1591
Optional ultrasonic testing (UT), Z-direction test (Z15/Z25/Z35)
Impact testing per batch at 0°C
Third-party inspection (SGS, BV, TUV) available
Customized processing: cutting, drilling, beveling, surface treatment

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—— Address:Mengcun Hui Autonomous County, Cangzhou City, Hebei Province