BS EN 42CrMo4 Alloy Steel Relevant Specifications

Although 42CrMo4 steel is more expensive than 41Cr4 steel, it is more preferable in terms of material properties. EN 42CrMo4 alloy engineering steel materials have been widely used in automotive driving elements. Otai Steel is able to supply you prime quality of 42CrMo4 alloy steel materials with wide range.

BS EN 42CrMo4 Alloy Steel Relevant Specifications and Equivalents

BS EN 10250 Material No. DIN ASTM A29 JIS G4105 BS 970-3-1991 BS 970-1955 AS 1444 AFNOR
42CrMo4 1.7225 38HM 4140 SCM440 708M40 EN19A 4140 42CD4

42CrMo4 Alloy Steel Chemical Composition

42CrMo4/1.7225 C Mn Si P S Cr Mo
0.38-0.45 0.60-0.90 0.40 max 0.035 max 0.035 max 0.90-1.20 0.15-0.30

DIN 42CrMo4 Alloy Steel?Mechanical?Properties

Size ? mm Yield stress
Rp0.2,N/nn2, min.
Ultimate tensile Stress,
A5,%, min.
Hardness HB Toughness
KV, Joule, min.
<40 750 1000-1200 11 295-355 35 at 20oC
40-95 650 900-1100 12 265-325 35 at 20oC
>95 550 800-950 13 235-295 35 at 20oC

Heat Treatment of 42CrMo4 Steels

Annealing of 42CrMo4 Steels

  • Heat steel?42CrMo4 forged steel slowly and thoroughly to 800-850C;
  • Cool slowly in the furnace to the temperature 480;
  • Complete annealing the steel in the air.

Application?of 42CrMo4 Alloy Steels

EN 42CrMo4 alloy steel is widely used for engineering steel purpose, such as: making various kinds of machinery, automobile, mining spare part, the gearwheel of the engine, the driving gear of supercharger, the connecting rob, the pinchock under the high pressure, parts for power train applications, cold formed fastener components, shafts, gears, drill collars for the oil exploration, etc.