31CrMoV9 Alloy Steel Rod Large Diameter 300 - 500mm Cutting Any Length
Products Specification
| Products Name | 31CrMoV9 Alloy Steel Round Bar |
| Diameter | 10 - 500 mm |
| Length | 6m or custom cutting any length as request |
| Type | Hot Rolled |
| Brand | BAOSTEEL DELTA DONGBEI HUAXI SHAGANG.etc |
| MOQ | 1 Ton |
| Loading Port | Shanghai Port |
| Packing | packing by steel wire rope |
| Deliver time | 5 - 7 days for stock materials |
| Other Grade | Q195,Q235,10#,20#,35#,45#,Q215,Q345,12Cr1Mov,15CrMo,304,3 16,20Cr,40Cr,20CrMo,35CrMo,42CrMo,40CrNiMo,GCr15,65Mn,50Mn, 50Cr,3Cr2W8V,20CrMnTi,5CrMnMo ,38CrMoAl, 31CrMoV9 |
| Standard | ASTM GB EN DIN |
| Application | Structure and Industrial |
Regular Standard Size of our Round Bar in Stock
| Standard Diameter | 10 12 15 18 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 120 130 140 150 160 180 200 210 220 230 250 270 300 320 330 350 360 370 380 390 400 410 420 430 440 450 460 470 480 490 500 |
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
3. Chemical Composition (Typical, wt%)
| Element | C | Si | Mn | Cr | Mo | V | P (max) | S (max) |
| Content | 0.28-0.35 | 0.15-0.40 | 0.40-0.70 | 2.30-2.70 | 0.15-0.25 | 0.10-0.20 | 0.025 | 0.025 |
4. Mechanical Properties (After Heat Treatment)
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Impact Energy (J) | Hardness (HB) |
| Typical Value | 900-1100 | 700-900 | ≥12 | ≥40 (at 20°C) | 270-320 |
(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)
| Country | Standard | Equivalent Grade | Key Differences |
| Germany | DIN EN 10083-3 | 34CrMoV9 | Higher C content |
| USA | AISI/SAE | 4137, 4140 | No vanadium (V) |
| Japan | JIS | SCM435, SNCM439 | Different Cr-Mo-V balance |
| UK | BS | 722M24 (En19B) | No vanadium |
| France | NF | 35CD4 | Similar Cr-Mo steel |
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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