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Chrome Moly 25CrMo4 Alloy Steel Bars
70.0 INR/Kilograms
Product Details:
- Grade 25CrMo4
- Type Round Bars
- Material Chrome Moly 25CrMo4 Alloy Steel
- Technique Hot Rolled / Forged
- Standard EN 10083-3, DIN 1.7218
- Tolerance H8, H9, H10 or as per requirement
- Length Custom/Standard Lengths up to 6000 mm
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Chrome Moly 25CrMo4 Alloy Steel Bars Price And Quantity
- 1 Kilograms
- 70.0 INR/Kilograms
Chrome Moly 25CrMo4 Alloy Steel Bars Product Specifications
- Drive shafts, Axles, Gears, Structural Parts
- Heat Treatment, Annealed, Normalized, Quenched & Tempered
- 16 mm - 350 mm
- H8, H9, H10 or as per requirement
- Custom/Standard Lengths up to 6000 mm
- Hot Rolled / Forged
- EN 10083-3, DIN 1.7218
- Automotive, Aerospace, Machinery, Engineering Components
- Black, Bright, Peeled, Turned or Polished
- Round Bars
- Chrome Moly 25CrMo4 Alloy Steel
- 25CrMo4
- Oiled, Un-oiled
- 800-1000 MPa
- 217-255 HB (Annealed)
- Annealed / Conditioned / Tempered
- Min 530 MPa
- Bars, Rods, Shafts
- Round
Product Description
25CrMo4 (standardized as W.Nr. 1.7218 under EN 10083-3) is a low-carbon variant within the Chromium-Molybdenum (Chrome Moly) alloy steel family. When specified in bar stock, it occupies a highly specialized niche: it bridges the gap between high-strength structural steels and highly weldable fabrication steels.
Unlike its higher-carbon relative 42CrMo4 (AISI 4140), 25CrMo4 drops the carbon level to achieve outstanding impact toughness and excellent weldability while preserving the signature heat-resistance and fatigue limits of a true chrome moly grade.
1. Chemical Composition (EN 10083-3 / W.Nr. 1.7218)
The deliberate reduction of carbon paired with targeted chromium and molybdenum levels defines its mechanical character:
| Element | Composition (%) | Primary Metallurgical Role |
| Carbon (C) | $0.22% - 0.29%$ | Kept low to maximize structural ductility and weld crack resistance. |
| Chromium (Cr) | $0.90% - 1.20%$ | Enhances hardenability, wear protection, and clean surface response. |
| Molybdenum (Mo) | $0.15% - 0.30%$ | Raises elevated-temperature creep strength and suppresses temper brittleness. |
| Manganese (Mn) | $0.60% - 0.90%$ | Functions as a deoxidizer and stabilizes through-hardening depth. |
| Silicon (Si) | $le 0.40%$ | Increases elasticity and the yield point. |
| Phosphorus / Sulfur | $le 0.025% / le 0.035%$ | Strictly limited to eliminate non-metallic inclusions and defects. |
2. Mechanical Profile vs. Dimensional Cross-Section
When ordered in the standard Quenched & Tempered (+QT) condition, 25CrMo4 bars show excellent yield-to-tensile ratios. However, due to its lower carbon content and absence of nickel, its mechanical thresholds scale based on the bar diameter ($d$):
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Small Bars ($le$ 16 mm): Tensile strength registers at 900 1100 MPa with a minimum yield strength of 700 MPa.
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Medium Bars (16 mm 40 mm): Tensile strength shifts to 800 950 MPa with a minimum yield of 600 MPa.
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Large Bars (40 mm 100 mm): Tensile strength measures 700 850 MPa with a minimum yield strength of 450 MPa.
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Massive Bars (100 mm 160 mm): Tensile strength tracks at 650 800 MPa with a minimum yield strength of 400 MPa.
3. High-Temperature Capability (Creep Resistance)
A major engineering advantage of 25CrMo4 is its behavior at elevated thermal thresholds. Thanks to the molybdenum additions, components machined from these bars resist continuous mechanical stress without stretching or suffering thermal relaxation at temperatures ranging from $450^circtext{C}$ up to $530^circtext{C}$. This makes it an ideal fit for steam-line and boiler assemblies.
4. Key Delivery States
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Quenched & Tempered (+QT): Pre-treated to typical working bands ($sim 220$ to $280text{ HBW}$). This allows direct machining into final components without the dimensional distortion risks associated with a post-fabrication quench line.
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Soft Annealed (+A): Normalized/annealed down to a maximum hardness of 212 HBW. This is the mandatory choice for complex machining, high-speed turning, or deep gundrilling to extend tool life.
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Treated for Shearability (+S): Softened to a maximum of 255 HBW to safely permit cold-shearing or cold-heading operations without fracturing the bar edges.
5. Direct Global Equivalents
If you are matching international drawings or evaluating material test certificates (MTCs), 25CrMo4 maps directly to:
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USA: AISI 4130 / SAE 4130 (The closest chemical and behavioral equivalent)
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Japan: JIS SCM420 / SCM430
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France (AFNOR): 25CD4
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United Kingdom: BS 708M25 / 708A25
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China: GB 30CrMo
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Russia: GOST 20KHM (20) / 30KHM (30)
6. Fabrication Guidelines: Welding and Machining
Technical Comparison
Superior Weldability: Unlike 42CrMo4 (AISI 4140) which is highly prone to cold cracking, 25CrMo4 can be successfully welded due to its lowered carbon window. It still requires a moderate preheat ($150^circtext{C} - 200^circtext{C}$) depending on the cross-sectional thickness, followed by controlled cooling to safeguard the heat-affected zone (HAZ).
Machining: In its annealed state, it chips beautifully and leaves an exceptionally clean surface finish. If machining in the +QT state, standard carbide tooling with rigid setups is recommended.
Superior Strength and Reliability
25CrMo4 alloy steel offers robust yield and tensile strength, making it ideal for components subjected to high mechanical stress such as drive shafts, axles, and gears. Its consistent performance enhances reliability and longevity in both automotive and aerospace applications.
Comprehensive Surface Protection and Finish Options
Choose from diverse surface finishes such as black, bright, peeled, turned, or polished. Additionally, bars can be supplied oiled or unoiled, catering to varied protection requirements and handling preferences across industries.
Flexible Manufacturing and Processing
Produced through hot rolling or forging, these bars undergo advanced processing, including heat treatment, annealing, normalizing, and quenching & tempering. This flexibility in manufacturing ensures each batch meets precise mechanical and dimensional specifications.
FAQ's of Chrome Moly 25CrMo4 Alloy Steel Bars:
Q: What are the primary applications for Chrome Moly 25CrMo4 Alloy Steel Bars?
A: These bars are widely used in automotive, aerospace, machinery, and engineering applications. Typical uses include drive shafts, axles, gears, and various structural components that demand high strength and excellent fatigue resistance.Q: How are 25CrMo4 Alloy Steel Bars processed for optimal performance?
A: They undergo processes such as annealing, normalizing, quenching, and tempering. These treatments enhance mechanical properties by refining the steel's structure, increasing strength, toughness, and dimensional stability.Q: When should I choose an oiled versus an unoiled surface for these steel bars?
A: Oiled surfaces are recommended when additional protection against corrosion during storage and transport is required. Unoiled surfaces may be preferred for immediate fabrication or applications that do not require interim protection.Q: Where can Chrome Moly 25CrMo4 Alloy Steel Bars be sourced in India?
A: These bars are available nationwide through dealers, exporters, manufacturers, suppliers, traders, and fabricators specializing in steel products. Many provide both standard and custom lengths, catering to various industrial needs.Q: What standards and tolerances do these bars comply with?
A: They meet industry standards EN 10083-3 and DIN 1.7218. Dimensional tolerances like H8, H9, and H10 are available, with the option to specify others according to project requirements.Q: How does the bar's condition, such as annealed or tempered, influence its use?
A: Annealed bars offer good machinability and are suitable for further heat treatment. Tempered or conditioned bars are chosen when higher strength and hardness are needed for immediate use in finished components.Tell us about your requirement
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