General Information

42CrMo4 is a steel for quenching and tempering, which has a good combination of strength and toughness in the quenched and tempered condition. After the oil quenching, the steel will be through hardened up to ø60 mm bar diameter. The microstructure of larger dimensions is not fully martensite. The steel is applicable to induction hardening. The surface hardness will exceed min. 53 HRC. 42CrMo4 can be delivered M-treated in order to optimize the machinability.

Variant 6082 is offered under the name MoC410M

Variant 6115 conform with SAE 4140 and ISO 898 Grade 10.9 up to 60 mm bar diameter

Variant 6137 conform with L7 ASTM A320 and ISO 898 Grade 10.9 up to 50 mm bar diameter

Variant SB9288 is offered under the name SB42CrMo4  

Variant SB9287 with a slightly increased hardenability, is offered under the name SB42CrMo4. 

Variant 327S is a continuous cast variant with slightly increased hardenability, similar to the ingot casted variant 327A

Variant 327A is an ingot cast variant with slightly increased hardenability.

Variant 326C  is a BQ-steel variant which fulfils SAE 4140 standard but has a restricted sulphur content for improved cleanliness and a lower maximum allowed phosphorus content for improved mechanical properties

M-Steel®

The basis for the concept is that non-metallic inclusions are modified and controlled with calcium treatment in a way to minimize tool wear and to maximize chip control in machining operations. Our M-Steel treatment can be applied to any steel grade. 

BQ-Steel®
BQ-Steel® is a bearing quality clean steel optimized for fatigue strength and is also ideal for new design solutions outside the bearing industry.

Similar designations

AISI 4140, 42CD4(AFNOR), 708M40(B.S.), SS 2244, SS142244, SAE 4140H, ASTM A193 B7, 41Cr4, 42CrMoS4, 1.7225