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Chemical and mechanical properties of Q460C grade spiral steel pipe
1、 Chemical composition
The chemical composition of Q460C spiral steel pipe is based on GB/T 1591-2018 and GB/T 16270-2009 standards, with the main elements and contents as follows:
Carbon (C): ≤ 0.20% (low-carbon design optimized weldability);
Silicon (Si): ≤ 0.55% (deoxidation effect, auxiliary strength enhancement);
Manganese (Mn): 1.10%~1.70% (core strengthening element, enhancing strength and toughness);
Phosphorus (P): ≤ 0.035% (low impurity control for cold brittleness);
Sulfur (S): ≤ 0.035% (reduces the risk of thermal brittleness);
Micro alloy elements:
Niobium (Nb) 0.015%~0.060%, Vanadium (V) 0.02%~0.20%, Titanium (Ti) 0.02%~0.20% (refine grain size, improve comprehensive performance);
Chromium (Cr) ≤ 0.70%, nickel (Ni) ≤ 0.70%, copper (Cu) ≤ 0.55% (enhanced corrosion resistance).
2、 Mechanical performance
Strength and plasticity:
Yield strength (σ s) (thickness dependent):
Thickness ≤ 16mm: ≥ 460 MPa；
16~40mm：≥ 440 MPa；
40~63mm：≥ 420 MPa；
63~100mm：≥ 400 MPa；
100~150mm：≥ 380 MPa；
Tensile strength (σ b): 550~720 MPa (when thickness ≤ 100mm);
Elongation rate (δ 5): ≥ 17% (thickness ≤ 40mm), ≥ 16% (thickness 40-150mm).
Resilience and special properties:
Low temperature impact toughness: 0 ℃ impact energy ≥ 34 J (ensuring low temperature environmental stability);
Z-direction performance: Z15/Z25/Z35 grades can be selected, with a cross-sectional shrinkage rate of ≥ 15%/25%/35% respectively (to prevent layered tearing);
Fatigue resistance: Stable under long-term alternating loads, suitable for dynamic load-bearing scenarios.
3、 Application Fields
Q460C spiral steel pipe is suitable for the following scenarios due to its high strength and comprehensive performance:
Bridges and Buildings: Large highways, railway bridges, and load-bearing structures of high-rise buildings;
Heavy machinery: mining supports, engineering machinery frames and chassis;
Energy and Chemical Industry: Petroleum Storage Tanks, Pressure Vessels, High Pressure Pipelines;
Ships and vehicles: hull structure, automotive chassis, and train components;
Low temperature engineering: infrastructure and equipment in cold regions (-20 ℃).
(Note: Specific parameters may be adjusted due to thickness range, delivery status, and Z-direction performance level.)
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
Domestic phone number：0086-317-6689999
International call：0086-317-6165555
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