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DIN 1.7225 (42CrMo4) Alloy Structural Steel Round Bar – Quenched and Tempered
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xDetalhes do produto
| Products Name | Alloy Steel Round Bar | Diameter | 10 - 450mm |
|---|---|---|---|
| Length | 6m | Tech | Hot rolled |
| Service | Cutting | MOQ | 1 Ton |
| Loading Port | Shanghai Port | Standard | ASTM EN GB |
Descrição de produto
Products Specification
|
Products Name |
Alloy Steel Round Bar |
|
Diameter |
20 - 350 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 ,20Cr,40Cr,20CrMo,35CrMo,42CrMo,40CrNiMo,GCr15,65Mn,50Mn, 50Cr,3Cr2W8V,20CrMnTi,25Cr2MoVA,5CrMnMo ,38CrMoAl, 30CrMnSiA,B16,31CrMoV9 |
|
Standard |
ASTM GB EN DIN |
|
Application |
Structure and Industrial |
DIN 1.7225 (42CrMo4) Alloy Structural Steel Round Bar – Quenched and Tempered
Product Overview
Our DIN 1.7225 (42CrMo4) Alloy Structural Steel Round Bar, supplied in a quenched and tempered (Q+T) condition, is engineered for high-load, high-fatigue, and high-wear mechanical applications requiring exceptional strength, toughness, and dimensional stability. Compliant with EN 10083-3, ISO 683-1, and widely recognized as AISI 4140 in North America, this premium-grade chromium-molybdenum steel delivers a superior balance of mechanical properties ideal for critical components in demanding industries.
Through controlled heat treatment—typically austenitizing at 840–870°C, oil quenching, and tempering between 500–650°C—the bar achieves a uniform microstructure (tempered martensite) with consistent hardness, high yield strength, and excellent impact resistance, even at low temperatures.
Key Features & Benefits
- ✅ High Strength-to-Toughness Ratio: Yield strength up to 930 MPa, tensile strength 1080–1250 MPa
- ✅ Excellent Fatigue Resistance: Ideal for cyclic loading (e.g., crankshafts, axles, gears)
- ✅ Good Hardenability: Deep through-hardening due to Cr and Mo content—suitable for large cross-sections
- ✅ Machinable in Q+T Condition: Better than fully hardened tool steels; compatible with standard HSS/carbide tools
- ✅ Weldable with Preheat: Can be welded using low-hydrogen procedures (preheat 200–300°C recommended)
- ✅ Traceable & Certified: Full EN 10204 3.1 mill test reports with chemical and mechanical data
Chemical Composition (Typical % – DIN EN 10083-3)
| Element | C | Si | Mn | P | S | Cr | Mo |
|---|---|---|---|---|---|---|---|
| Range | 0.38–0.45 | 0.17–0.37 | 0.60–0.90 | ≤0.025 | ≤0.025 | 0.90–1.20 | 0.15–0.25 |
Low sulfur and phosphorus ensure improved ductility and reduced risk of hot shortness.
Mechanical Properties After Quenching & Tempering
| Tempering Temp. | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) | Impact Energy (Charpy V, J @ -20°C) |
|---|---|---|---|---|---|
| 500°C | 1200–1250 | ≥1080 | ≥10 | 341–363 | ≥47 |
| 550°C | 1100–1180 | ≥980 | ≥11 | 302–341 | ≥54 |
| 600°C | 1000–1080 | ≥900 | ≥12 | 269–302 | ≥63 |
| 650°C | 930–1000 | ≥785 | ≥13 | 241–269 | ≥78 |
Properties vary slightly based on bar diameter. Larger diameters may show marginally lower core hardness due to quench severity limits.
Dimensional Range & Tolerances
| Parameter | Standard Offering |
|---|---|
| Diameter | 20 mm – 250 mm |
| Length | 3,000 mm – 6,000 mm (custom cuts available) |
| Straightness | ≤ 0.3 mm/m (standard), ≤ 0.15 mm/m (precision) |
| Diameter Tolerance | ±0.5% or per ISO h11 (as-rolled Q+T); precision ground options (h6/h7) available upon request |
| Surface Condition | Peeled, turned, or black (scale-free after shot blasting); optional precision grinding |
Note: For applications requiring tight fits or minimal machining, we offer precision-ground 42CrMo4 Q+T bars with Ra ≤ 0.8 µm and h7 tolerance.
Common Applications
- Automotive: Crankshafts, camshafts, steering knuckles, drive axles
- Oil & Gas: Drill collars, downhole tools, valve stems
- Heavy Machinery: Excavator pins, hydraulic cylinders, gear shafts
- Aerospace: Landing gear components, actuator rods
- Industrial Equipment: High-torque couplings, spindle bars, forging dies
- Energy: Wind turbine main shafts, pump rotors
Heat Treatment Guidelines
While supplied in Q+T condition, additional processing may be required:
- Stress Relieving: 600–650°C for 1–2 hours, air cool – to minimize distortion before final machining
- Induction Hardening: Surface hardening possible for wear-resistant journals (e.g., 55–60 HRC surface, tough core)
- Nitriding: Possible after final machining (tempering temp must exceed nitriding temp ～520°C)
Avoid re-quenching without expert consultation—risk of cracking or distortion is high.
Comparison: 42CrMo4 vs. Similar Grades
| Grade | Standard | Key Difference | Best For |
|---|---|---|---|
| 42CrMo4 | EN/DIN | Balanced Cr-Mo; excellent hardenability | High-strength structural parts |
| 4140 | AISI/SAE | Nearly identical; minor spec variations | North American machinery |
| 42CrMoS4 | EN | Higher sulfur (～0.020–0.040%) for free-machining | High-volume CNC parts (reduced tool wear) |
| 34CrNiMo6 | EN | Higher Ni content → superior toughness | Cryogenic or impact-critical uses |
Quality Assurance & Certification
- Produced under ISO 9001 and IATF 16949 (for automotive customers)
- Ultrasonic Testing (UT) available per SEP 1921 or ASTM A388 for internal soundness
- Magnetic Particle Inspection (MPI) for surface defect detection (optional)
- Full chemical analysis, tensile, impact, and hardness test reports included
- Batch traceability via unique heat number
Ordering Information
Please specify the following when requesting a quote:
- Grade: DIN 1.7225 / 42CrMo4
- Heat treatment condition: Quenched & Tempered (state desired hardness or tempering temperature if critical)
- Diameter and length
- Surface finish: Black, peeled, turned, or precision ground
- Tolerance class (e.g., ISO h11, h9, or custom)
- Quantity and delivery terms (FOB, CIF, etc.)
- Certification level (EN 10204 2.2, 3.1, or 3.2)
Lead time: 15–30 days for standard sizes; expedited options available.
Why Choose Our 42CrMo4 Q+T Round Bar?
- Consistent Performance: Tight control over chemistry and heat treatment ensures repeatable results
- Global Compliance: Meets European, American, and international standards
- Technical Support: Metallurgical engineers available for material selection and processing advice
- Sustainability: Produced with >80% recycled content; energy-efficient heat treatment lines
Conclusion
The DIN 1.7225 (42CrMo4) Quenched and Tempered Alloy Steel Round Bar stands as one of the most versatile and reliable materials in mechanical engineering. Its unmatched combination of strength, toughness, and hardenability makes it the go-to choice for components that must perform under extreme stress, fatigue, and dynamic loads.
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