Carbon Steel: Properties, Production, Examples and Applications

4130 Steel Pipe

Material Characteristics

• Chemical Composition: Carbon (C) 0.28-0.33%, Manganese (Mn) 0.40-0.60%, Chromium (Cr) 0.80-1.10%, Molybdenum (Mo) 0.15-0.25%, Silicon (Si) 0.15-0.35%, Phosphorus (P) ≤0.035%, Sulfur (S) ≤0.040%
• Performance Advantages: Quenching and tempering heat treatment provides a balance of high strength and toughness, with tensile strength of 621-724 MPa, yield strength of 483-586 MPa, and elongation of 10-20% It offers better weldability than 4140 steel, suitable for complex structural components

Execution Standards

• International Standards: ASTM A29/A29M (alloy structural steel), ASTM A519 (seamless steel pipes for mechanical applications)
• Industry Certifications: Commonly complies with API 5CT standards (e.g., Q125, T95 grades) and passes NACE MR0175 corrosion resistance tests in the oil and gas sector1014.

Production Process

1. Smelting: Electric furnace + refining furnace ensures uniform composition.
2. Forming: Hot-rolled or cold-drawn seamless pipes with tight dimensional control.
3. Heat Treatment: Quenching (850-880°C) and tempering (400-650°C) optimize mechanical properties
4. Testing: 100% ultrasonic flaw detection, hydrostatic testing, and surface inspection.
5. Surface Treatment: Optional phosphating, galvanizing, or sandblasting for enhanced corrosion resistance and wear resistance

Application Fields

• Aerospace: Aircraft landing gear, engine components
• Oil & Gas: Drill pipes, blowout preventers, high-pressure pipelines (API 5CT compliant)
• Mechanical Manufacturing: Gears, shafts, high-pressure valves
• Automotive Industry: Crankshafts, connecting rods, suspension systems

Specification Range

• Outer Diameter: 60.3-765 mm (common sizes: 60.3, 73, 88.9, 101.6, 114.3 mm)
• Wall Thickness: 5-120 mm, length customizable (typically 6-12 meters)

PRODUCT DETAILS

Mechanical Properties

Chemical Composition Table