Description: BBN steel is a well-known steel manufacturer and service provider in China, EN 10083-3 3077 42CrMo4 alloy steel is our superior product, we are favored by customers with high quality, competitive price and excellent service
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EN 10083-3 42CrMo4 Alloy Steel Plate, Round Bar & Forgings | Heat-Treatable, Quenched & Tempered
Premium Heat-Treatable Cr-Mo Alloy Structural Steel | Material No. 1.7225 | High Fatigue Strength & Low-Temperature Toughness | Negligible Temper Brittleness | MTC & Full Inspection Reports
High Fatigue Strength42CrMo4 delivers high fatigue strength and stable low-temperature impact toughness with negligible temper brittleness, ideal for cyclic alternating loads.
Strong HardenabilityCompared with 34CrMo4, higher C and Cr raise tensile strength, hardness and overall hardenability for severe loads.
Heavy-Duty GradeWidely used for locomotive gears, connecting rods, spring clips and petroleum drill-pipe joints under bending, torsion and friction.
01Product Overview & Specifications
EN 10083-3 42CrMo4 is a premium quenched and tempered chromium-molybdenum alloy structural steel. Compared with 34CrMo4, 42CrMo4 contains higher carbon and chromium, delivering greatly improved tensile strength, hardness and overall hardenability.
With balanced mechanical performance, 42CrMo4 withstands complex alternating loads, torsion, friction and high-pressure working conditions. It offers excellent fatigue resistance and stable low-temperature impact toughness with negligible temper brittleness, supplied as plates, round bars, flat bars, forgings and profiles.
Item
Specification
Executive Standard
EN 10083-3 Heat-treatable steels — technical delivery conditions for alloy steels
Higher C & Cr than 34CrMo4 for improved strength and hardenability; outperforms 35CrMo series
Comparable Grade
34CrMo4 — lower C / Cr; 35CrMo series (Chinese comparable)
Product Forms
Steel PlateRound BarFlat BarForgingsProfiles
Thickness
3mm – 500mmcustomizable
Width
1000mm – 4000mmcustomizable
Length
1000mm – 18000mmfixed cutting available
Core Advantage
High fatigue strength, good low-temperature toughness, no obvious temper brittleness
MOQ
1 Ton — negotiable
Certification
Mill Test Certificate (MTC), EN 10204 3.1 / 3.2 full inspection reports
Processing Services
Customized cutting, heat treatment, machining and complete certification documents
02Equivalent International Steel Grades
42CrMo4 (1.7225) is a widely used European quenched and tempered alloy steel with mature equivalent grades across global mainstream standards, supporting cross-standard material substitution.
Standard System
Equivalent Grade
EN 10083-3 (EU)
42CrMo41.7225
ASTM / AISI (USA)
4140
JIS (Japan)
SCM440/ SCM445
GB (China)
42CrMo
BS (UK)
708A42
AFNOR (France)
42CD4
Note: Equivalent grades share the ~0.40% C / Cr-Mo alloying concept and comparable hardenability, yet differ in impurity limits, testing and certification. For design-critical applications, verify detailed specifications before substitution. BBN technical team can assist with grade matching.
03Grade Designation & Meaning
The DIN / EN designation 42CrMo4 encodes the carbon level, alloying elements and grade index of this heat-treatable steel.
42
42 — Carbon Content
Indicates a mean carbon content of approximately 0.42% (100 × C%) for high hardness after hardening.
Cr
Cr — Chromium
Chromium improves hardenability, hardness and wear resistance of the heat-treated steel.
Mo
Mo — Molybdenum
Molybdenum raises high-temperature strength, hardenability and structural stability of the alloy.
4
4 — Grade Index
Sequence / quality index within the DIN heat-treatable steel family, distinguishing it from other Cr-Mo grades.
42CrMo4 vs 34CrMo4: Both are Cr-Mo heat-treatable steels, but 42CrMo4 carries higher carbon and chromium, delivering greatly improved tensile strength, hardness and hardenability; it also outperforms the 35CrMo series in comprehensive strength. Preferred for complex alternating-load, torsion and high-pressure components.
04Chemical Composition
Cast analysis limits of 42CrMo4 per EN 10083-3 (values in %, unless a range is given).
Element
Content (%)
C (Carbon)
0.38 – 0.45
Si (Silicon)
0.40 max
Mn (Manganese)
0.60 – 0.90
P (Phosphorus)
0.025 max
S (Sulfur)
0.035 max
Cr (Chromium)
0.90 – 1.20
Mo (Molybdenum)
0.15 – 0.30
Note: Values above are cast-analysis limits per EN 10083-3. Chromium and molybdenum provide the hardenability and high-temperature strength that distinguish 42CrMo4 from plain-carbon grades. The exact heat analysis of each batch is stated in its Mill Test Certificate (MTC).
05Mechanical Properties
Typical mechanical properties of 42CrMo4 in the quenched and tempered condition (reference values per EN 10083-3; actual results depend on section size and heat-treatment parameters).
252 MPaMin. Yield Rp0.2Quenched & tempered
877 MPaMin. Tensile RmQuenched & tempered
24 JImpact KV / KuCharpy, room temp
14%Elongation AMin. elongation
Mechanical properties of 42CrMo4:
Grade
Yield Rp0.2 (MPa, min)
Tensile Rm (MPa, min)
Impact (J)
Elongation A (%)
42CrMo4
252
877
24
14
Note: 42CrMo4 is a heat-treatable steel supplied in a soft condition; the mechanical values above are achieved after quenching and tempering and vary with section thickness and treatment. For your specific size and hardness requirement, we confirm properties in the MTC.
06Product Types, Processing & Service
BBN Steel supplies full-spec EN 10083-3 42CrMo4 alloy steel with stable quality, strictly compliant with standard chemical and mechanical requirements, ideal for locomotive, mechanical transmission and petroleum engineering components.
1
Steel Plate
Hot-rolled plates 3–500 mm for high-strength structural and transmission parts; customizable cutting and heat treatment.
2
Round / Flat Bar
Round and flat bars for shafts, gears, connecting rods and drill-pipe joints; uniform hardness after quench & temper.
3
Forgings & Profiles
Forged blocks and profiles for locomotive traction gears, supercharger gears and high-load components.
1
Fast Delivery
Stock plates, bars and forgings with prompt delivery; flexible MOQ from 1 ton.
2
Custom Processing
Cutting, heat treatment and machining per your drawings and hardness requirements.
3
MTC & Inspection
EN 10204 3.1 / 3.2 full inspection reports for every order.
4
Tech Consultation
Grade matching and processing advice replied within 24 hours by email or phone.
Full-spec 42CrMo4 plates, bars, forgings in 3–500 mm thickness, 1000–4000 mm width
Heat-treatable Cr-Mo alloy steel, 1.7225, quenched & tempered for high fatigue strength
Customized cutting, heat treatment and machining services
EN 10204 3.1 / 3.2 MTC, full inspection reports and complete certification
Get Your EN 10083-3 42CrMo4 Steel Quotation Now
Send us your product form (plate / bar / forging), dimensions (thickness × width × length or diameter), quantity, heat-treatment and hardness requirements. We will reply with stock status, competitive factory price, delivery time and complete certification within 24 hours.
BBN Steel has established a complete set of production and supplier management system processes to ensure the improvement of product quality and better service to users.
Production Control
BBN Steel has established a complete production quality control process to ensure every link from research and development to mass production.
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We have successively won various international authoritative certifications, GB /T19001-ISO9001: 2000 quality management system was implemented.
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We provide booking space, shipping tracking service and after-sales service, we will always be first-class products and perfect pre-sale and after-sales service.
Get in Touch
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