42crmo4 Alloy Steel
42crmo4 Alloy Steel
42crmo4 Alloy Steel
42crmo4 Alloy Steel
42crmo4 Alloy Steel

42crmo4 Alloy Steel

Chemical composition Carbon C: 0.38 ~ 0.45% Silicon Si: ≤0.40% Manganese Mn: 0.60 ~ 0.90% Sulfur S: Allowable residual content ≤0.035% P: Allowable residual content ≤0.035% Chromium Cr: 0.90 ~ 1.20% Molybdenum Mo: 0.15 ~ 0.30%

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Product Introduction

42crmo4 alloy steel
42CrMo4 standard control:

China GB 42CrMo, Russia OCT 38XM, USA AISI 4140/4142, UK BS 708M40/708A42/709M40, France NF 40CD4/42CD4, Germany DIN 41CrMo4/42CrMo4, Japan JIS SCM4, international ISO 683/13

Mechanical property

Tensile strength σb (MPa) : ≥1080(110)

Yield strength σs (MPa) : ≥930(95)

Elongation δ5 (%) : ≥12

Section shrinkage (%) : ≥45

Impact power Akv (J) : ≥63

Impact toughness value αkv (J/cm²) : ≥78(8)

Hardness: ≤217HB

Specimen size: specimen blank size is 25mm

Heat treatment specification and metallographic structure

Heat treatment specification: quench 850℃, oil cold; Tempering 560℃, water cooling, oil cooling.

Metallographic structure: tempered sorbite.

Heat treatment:

annealing No.1 "760±10℃ annealing, furnace cooling to 400℃ air cooling.

HB220-230

normalize No.4 860±10℃ normalizing, air cooling out.

quenching water or oil at 840±10 ° C (depending on the complexity of the product), tempering at 680-700 ° C. HB< 217

quenching oil at 840±10℃ and tempering at 470 ℃ is quenching according to quenching+tempering No.6. HRC41-45

quenching oil at 840±10℃ and tempering at 480 ℃. Quenching quenching+tempering No.7 HRC35-45

quenching oil at 850℃ +tempering No.8, then tempering at 510 ℃. HRC38-42

quenching oil at 850℃ +tempering No.9 and tempering at 500 ℃. HRC40-43

quenching oil at 850℃ +tempering No.10, then tempering at 510℃. HRC36-42

quenching quenching+tempering No.11 at 850℃ and tempering at 560℃. HRC32-36

quenching oil at 860℃ +tempering No.12 and tempering at 390 ℃. HRC48-52

Softening annealing specification

Annealing temperature 680~700°C, slow cooling in the furnace, hardness ≤217HBW.

Quenching and tempering specifications

Quenching temperature 830 ~860°C, oil cooling or 180 ~220°C salt bath cooling, hardness 52HRC, strength 1780MPa.

Tempering temperature of 100 ° C / 200 ° C / 300 ° C / 400 ° C / 500 ° C / 600 ° C, 49 HRC hardness 50 HRC / / 46 HRC / 42 HRC / 36 HRC / 28 HRC

Delivery status:

Delivery in heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment, delivery status should be indicated in the contract.