42CrMo – 42CrMo4 Hot Cold Rolled Alloy Structural Ultra High Strength Carbon Steel Plate

42CrMo alloy steel plates Chemical composition (%)

Grade C Si Mn Cr Mo
42CrMo 0.38-0.45 0.17-0.37 0.50-0.80 0.90-1.20 0.15-0.25

42CrMo Alloy Steel Relevant Specifications and Equivalents

BS EN 10250 Material No. DIN ASTM
BS 970-3-
BS 970-
42CrMo4 1.7225 38HM 4140 SCM440 708M40 EN19A 4140 42CD4

Product Introduction

42CrMo Alloy Steel is a common chromium-molybdenum steel that usually used after quenched and tempered, with high intensity, high hardenability. BS EN 42CrMo4 round steel has better performance than 34CrMo4 steel due to the carbon and chromium content is higher. 42CrMo4 alloy steel has higher strength and hardenability. The 42CrMo4 alloy material also has high fatigue strength and good low-temperature impact toughness. The temper brittleness is not obvious.

Material Grade42CrMo
or other width as the customers’ requirements.
or other length as the customers’ requirements
Processcold rolled; hot rolled
Surfacerough turning; milling; grinding; turning;
 blackface; galvanized; coated;
Physical properties:
  1. Critical point temperature (approximate value): Ac1 = 730 C, Ac3 = 800 C, Ms = 310 C.
  2. Linear expansion coefficient: temperature 20-100 degrees C/20-200 degrees C/20-300 degrees C/20-400 degrees C/20-500 degrees C/20-600 degrees C, linear expansion coefficient: 11.1 x 10K/12.1 x 10K/12.9 x 10K/13.5 x 10K/13.9 x 10K/13.9 x 10K 14.1 x 10K.
  3. Elastic modulus: temperature 20 degree C/300 degree C/400 degree C/500 degree C/600 degree C, elastic touch 210000MPa/185000MPa/175000MPa/165000MPa/15500oMPa
  4. 42CrMo allowable stress 42CrMo allowable stress 186-310/MPa, yield point 930s/MPa, 42CrMo strength, hardenability, good toughness, small deformation during quenching, high creep strength and endurance strength at high temperature.

42CrMo alloy steel plates Application:

42CrMo alloy steel plates are usually used to manufacture large gear, turbocharger transmission gear, pressure vessel gear, rear axle, loaded connecting rod and spring clamp for locomotive traction. 42CrMo steel are also used for deep drilling rod joints and fishing tools under 2000m, as well as bending machine mold, etc.

Additional Condition:

UT(Ultrasonic examination), AR(As Hot Rolled only), TMCP(Thermal Mechanical Control Processing), N(Normalized), Q+T(Quenched and Tempered),Z Direction Test(Z15,Z25,Z35), Charpy V-Notch Impact Test, The Third Party Test (such as SGS Test), Coated or Shot Blasting and Painting.

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