Product Parameters of Q345 Steel Pipe
| Category | Specifications |
|---|---|
| Chemical Composition | Carbon (C): ≤0.20% Silicon (Si): ≤0.55% Manganese (Mn): 1.00–1.60% Phosphorus (P): ≤0.045% Sulfur (S): ≤0.045% Chromium (Cr): ≤0.30% Nickel (Ni): ≤0.50% Copper (Cu): ≤0.30% Vanadium (V): 0.02–0.15% Niobium (Nb): 0.015–0.060% |
| Mechanical Properties | Tensile Strength (σb): 470–630 MPa Yield Strength (σs): ≥345 MPa (varies with thickness) Elongation (δ5): ≥21% Impact Absorbed Energy (AKV): ≥34 J (Grade C) |
| Heat Treatment | Hot rolling, controlled rolling, or normalized Temperature range: 1476°C to 1595°C |
| Delivery State | Hot-rolled, normalized, or normalized + tempered |
| Dimensions | Outer Diameter: 10–630 mm Wall Thickness: 1.5–40 mm Length: Customizable |
| Standards | GB/T 1591-2018 (China), ASTM A572 (International) |
Applications of Q345 Steel Pipe
Q345 steel pipe is widely used in structural and industrial applications due to its high strength, weldability, and cost-effectiveness:
Construction & Infrastructure
Structural components for buildings, bridges, and industrial frameworks (e.g., beams, columns)
Railway tracks and support structures
Energy & Utilities
Low-pressure boilers and pressure vessels (≤6 MPa, ≤450°C)
Oil/gas storage tanks and pipelines (with corrosion-resistant coatings)
Transportation & Heavy Machinery
Vehicle chassis and parts (e.g., truck frames, railcar components)
Crane arms and agricultural equipment
Specialized Uses
Cold-formed precision tubes for mechanical parts (tolerance ±0.05mm)
Wear-resistant components (e.g., rollers, sprockets) after surface treatment
Key Advantages
Weldability: Compatible with common welding methods (arc, MIG, TIG)
Cost-Effectiveness: Lower alloy content reduces material costs
Ductility: Suitable for cold bending and forming processes
For detailed manufacturing guidelines (e.g., rolling parameters), refer to GB/T 1591-2018 or ASTM A572 standards.
