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31CrMoV9 Alloy Steel Rod Large Diameter 300-500mm High Strength Heat Resistant Round Bar
Product Details
| Model Number | 31CrMoV9 | Technique | Forged |
|---|---|---|---|
| Surface Treatment | Polished | Alloy Type | Non-alloy |
| Diameter Range | 300 - 500mm | Carbon Content | 0.28-0.35 Wt% |
| Silicon Content | 0.15-0.40 Wt% | Manganese Content | 0.40-0.70 Wt% |
| Chromium Content | 2.30-2.70 Wt% | Molybdenum Content | 0.15-0.25 Wt% |
| Vanadium Content | 0.10-0.20 Wt% | Tensile Strength | 900-1100 MPa |
| Yield Strength | 700-900 MPa | Elongation | ≥12% |
| Hardness | 270-320 HB | ||
| Highlight | Large Diameter 300-500mm Alloy Steel Rod,High Strength Steel Round Bar,Heat Resistant 31CrMoV9 Steel Bar |
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Product Description
31CrMoV9 Alloy Steel Rod - Large Diameter 300-500mm
31CrMoV9 Alloy Steel Rod Large Diameter 300-500mm with custom cutting round disc capabilities for industrial applications.
Material Overview
31CrMoV9 is a chromium-molybdenum-vanadium (Cr-Mo-V) alloy structural steel renowned for its high strength, excellent toughness, and superior heat resistance. The addition of vanadium enhances grain refinement, improving creep resistance and fatigue strength, making it ideal for high-stress and high-temperature applications.
Specifications & Standards
Primary Standard: DIN EN 10083-3 (Quenched and tempered steels)
Equivalent International Standards:
Equivalent International Standards:
- ISO: 34CrMoV9 (similar composition)
- USA (AISI/SAE/UNS): 4137 (similar, lacks vanadium), 4140 (common alternative)
- Japan (JIS): SCM435 (similar Cr-Mo steel, lower V)
- UK (BS): 722M24 (similar to En19B, no V)
- France (NF): 35CD4 (similar Cr-Mo steel)
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 |
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.
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
International Equivalent Grades
| 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 |
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
Performance Summary: 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.
Product Images
Contact us for additional details on heat treatment or welding procedures for your specific application requirements.
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