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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
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.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
Business Type:
Manufacturer,Distributor/Wholesaler,Exporter
Total Annual:
>1000000
Employee Number:
>100
Ecer Certification：
Verified Supplier
Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative... Our company is located in Wuxi City, China, we are a stainless steel plate, seamless steel pipe, round steel, steel belt, decorative pipe and other products distribution wholesale private enterprise. Our company operates stainless steel plate, seamless steel pipe, round steel, steel belt, decorative...
