| Category | Specifications |
|---|---|
| Chemical Composition | Carbon (C): 0.17-0.23% Silicon (Si): 0.17-0.37% Manganese (Mn): 0.35-0.65% Sulfur (S): ≤0.035% Phosphorus (P): ≤0.035% Chromium (Cr): ≤0.20% Nickel (Ni): ≤0.30% Copper (Cu): ≤0.25% 12 |
| Mechanical Properties | Tensile Strength (σb): ≥410 MPa Yield Strength (σs): ≥245 MPa Elongation (δ5): ≥25% Reduction of Area (ψ): ≥55% Hardness (HB): ≤156 (untreated) 12 |
| Heat Treatment | Normalizing at 910°C, air cooling (optional) 13 |
| Delivery State | Hot-rolled, cold-drawn, or heat-treated (annealed, normalized, or tempered) 24 |
| Dimensions | Outer Diameter: 10-630 mm Wall Thickness: 1.5-40 mm Length: Customizable 45 |
| Standards | GB/T 699-2015 (China), ASTM A106 (International) 46 |
Applications of No. 20 Steel Pipe
No. 20 steel pipe is widely used in industries requiring high strength, ductility, and weldability:
Fluid Transportation
Oil & gas pipelines (e.g., Φ426×8mm for high-pressure oil transport) 4
Water supply and drainage systems 4
Mechanical & Automotive Parts
Gears, shafts, and bolts (after carburizing and heat treatment) 13
Automotive components (e.g., brake pads, lever shafts) 3
Pressure Vessels & Boilers
Low-pressure steam pipes (≤6 MPa, ≤450°C) 3
Heat exchangers in petrochemical plants 4
Construction & Structural Uses
Scaffolding and structural supports 5
Railway components (e.g., piston rods) 3
Specialized Applications
Cold-drawn precision tubes for machinery (tolerance ±0.05mm) 4
Corrosion-resistant pipelines (with internal coatings) 4
Key Advantages
Weldability: Excellent for fabrication and joining 34
Machinability: Easy to cut, drill, and thread 34
Cost-Effectiveness: Balanced performance at moderate cost 46
For detailed manufacturing processes (e.g., hot rolling, cold drawing), refer to industry standards
