31crmov9 Alloy Steel Rod Large Diameter 300 - 500mm

31CrMoV9 Alloy Steel Rod Large Diameter 300 - 500mm Cutting Any Length

Products Specification

Regular Standard Size of our Round Bar in Stock

31CrMoV9 Alloy Steel Rod Large Diameter 300 - 500mm Custom Cutting Round Disc

31CrMoV9 Alloy Structural Steel - Comprehensive Overview

1. Introduction

31CrMoV9 is a chromium-molybdenum-vanadium (Cr-Mo-V) alloy structural steel known for its high strength, excellent toughness, and superior heat resistance. The addition of vanadium (V) enhances grain refinement, improving creep resistance and fatigue strength, making it suitable for high-stress and high-temperature applications.

2. Specifications & Standards

• Germany/EU Standard: DIN EN 10083-3 (Quenched and tempered steels)

• Equivalent International Standards:

  • ISO: 34CrMoV9 (similar composition)

  • USA (AISI/SAE/UNS): 4137 (similar, but lacks vanadium), 4140 (common alternative, no V)

  • Japan (JIS): SCM435 (similar Cr-Mo steel, lower V)

  • UK (BS): 722M24 (similar to En19B, no V)

  • France (NF): 35CD4 (similar Cr-Mo steel)

3. Chemical Composition (Typical, wt%)

4. Mechanical Properties (After Heat Treatment)

(Note: Properties vary based on heat treatment conditions, such as quenching & tempering.)

5. Key Features & Advantages

High Strength-to-Weight Ratio - Ideal for load-bearing components.
Excellent Heat Resistance - Performs well up to 500-550°C (932-1022°F).
Good Toughness & Fatigue Resistance - Suitable for dynamic loads.
Weldability & Machinability - Can be welded with pre/post-heating.
Vanadium-Enhanced Microstructure - Improves creep and wear resistance.

6. Equivalent Steel Grades (International Comparison)

7. Typical Applications

Power Generation: Turbine shafts, bolts, rotors.
Aerospace: High-stress fasteners, landing gear components.
Automotive: Crankshafts, connecting rods (high-performance engines).
Oil & Gas: Drill collars, pressure vessels.
Heavy Machinery: Gears, axles, high-load structural parts.

Conclusion

31CrMoV9 is a high-performance alloy steel with excellent strength, heat resistance, and fatigue durability, making it ideal for critical engineering applications. Its closest equivalents are 34CrMoV9 (ISO/DIN) and 4137/4140 (USA), though vanadium content varies.

For high-temperature and high-stress environments, 31CrMoV9 remains a superior choice over standard Cr-Mo steels.

Would you like additional details on heat treatment or welding procedures?

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