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Q345C for zero degree state

Q345C for zero degree state

Product Description : 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 ,...
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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:

PropertyValue (Typical)
Yield Strength (MPa)≥ 345 MPa (≤16mm)
Tensile Strength (MPa)470–630 MPa
Elongation (%)≥ 21%
Charpy Impact Energy≥ 27 J @ 0°C
WeldabilityGood (low carbon equivalent)
Chemical Composition (Max %):
ElementCSiMnPS
%0.200.501.700.0350.035

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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