4140 Chrome rod Q+T means this material is in the quenched and tempered condition (+QT). AISI 4140 medium carbon bearing steel in the form of hot rolled/hot forged quenched and tempered seamless forged parts. This specification covers Material Grade, Homogeneity, Microstructure and Mechanical properties. Forged parts produced with this steel are used for manufacturing bearing retaining parts. All other requirements, common to medium carbon bearing steel grades in the form of rolled/hot forged,quenched and tempered ring are specified in EN 10083-3 and ISO 683-17.
SAE4140 Equivalent Material
SAE4140 material (1.7225 steel) equivalent to US ASTM SAE, Germany DIN, British BSI, France NF, ISO, Japanese JIS and Chinese GB standard. (For reference)
| 4140 Equivalent Grade | |||||||||||||||
| European Union | US | China | Japan | ISO | |||||||||||
| Standard | Grade (Steel Number) | Standard | Grade | Standard | Grade | Standard | Grade | Standard | Grade | ||||||
| EN 10083-3 | 42CrMo4 (1.7225) | AISI SAE; ASTM A29/A29M | 4140 | GB/T 3077 | 42CrMo | JISG 4105 | SCM440 | ISO 683-18 | 42CrMo4 | ||||||
- 4140 Chrome Rod Q+T hardness in HRC: ≥53 (after flame or induction hardening)
- 42CrMo4 hardness in HBW: ≤255 (treated to improve shearability); ≤241 (soft annealed)
Material 4140 Heat Treatment
- Quenching temperature: 820 to 880 ℃ (Austenitizing period: at least 30 min; Quenching agent: Oil or water)
- Tempering temperature: 540 to 680 ℃ (at least 60 min)
- End quench test: 850 ± 5 ℃
SAE4140 has high strength and wear-resistance,widely used in many industries.Components with high strength and toughness for cylinder rods, automotive parts,mechanical engineering, armament components,such as geer wheels,pinions,connecting rods,parts for mechanical engineering. Statically and dynamically stressed components for vehicles, engines and machines.