42CrMo

Description

  42CrMo钢属于超高强度钢,具有高强度和韧性,淬透性也较好,无明显的回火脆性,调质处理后有较高的疲劳极限和抗多次冲击能力,低温冲击韧性良好。42CrMo steel is an ultra-high strength steel with high strength and toughness, good hardenability, no obvious tempering brittleness, high fatigue limit and multiple impact resistance after quenching and tempering treatment, and good low-temperature impact toughness.

Worldwide equivalents of 42CrMo steel

country / regionChinaEUGermanyJapanFranceEnglandUSA
StandardGBENDIN,WNrJISAFNORBS
Grade42CrMo42CrMo4 (1.7225)42CrMo4 SCM440H 42CD4708M40CFS1141404142
country / regionItalySpainFinlandRussiaInterSweden
 
StandardUNIUNESFSGOSTISOSS 
Grade42CrMo4 40CrMo4F1252K10035KHM38KHM42CrMo42244 
 
Chemical Composition of 42CrMo Steel Material
CSiMnPSCrMo
0.38 to 0.450.17 to 0.370.50 to 0.80≤ 0.030≤ 0.0300.90 to 1.200.15 to 0.25

 Mechanical Properties of 42CrMo Steel

Yield strength: ≥ 930 MPa

Tensile strength: ≥ 1080 MPa

Elongation: ≥12%

Rate of reduction in area: ≥45%

Impact absorbing energy: ≥ 63 J

Material Brinell hardness: ≤229 (Annealed or high temperature tempered steel rod)

Sample diameter: 25mm

Physical properties of 42CrMo steel

Critical temperature of 42CrMo steel

Critical pointAc1Ac3Ms
Temperature/℃730800310

Expansion coefficient of 42CrMo steel

Temperature/℃20~10020~20020~30020~40020-50020-600
Expansion coefficient/℃-111.1×10K12.1×10K12.9×10K13.5×10K13.9×10K14.1×10K

Thermal conductivity of 42CrMo steel

Temperature/℃20300400500600
Coefficient of thermal conductivity210000MPa185000MPa175000MPa165000MPa15500oMPa

Heat treatment:

First quenching heating temperature: 850 ℃(Cooling – oil)

Tempering heating temperature: 560℃ (Cooling – water, oil)

Features and Application:

强度、淬透性高,韧性好,淬火时变形小,高温时有高的蠕变强度和持久强度。

用于制造要求较35CrMo钢强度更高和调质截面更大的锻件,如机车牵引用的大齿轮、增压器传动齿轮、压力容器齿轮、后轴、受载荷极大的连杆及弹簧夹.

也可用于 2000m以下石油深井钻杆接头与打捞工具,并且可以用于折弯机的模具等。

High strength and hardenability, good toughness, small deformation during quenching, high creep strength and lasting strength at high temperature.

It is used to manufacture forgings with higher strength and larger quenched and tempered section than 35CrMo steel, such as large gear for locomotive traction, supercharger transmission gear, pressure vessel gear, rear axle, connecting rod and spring clamp under heavy load

It can also be used for drill pipe joints and fishing tools in oil deep wells below 2000m, and can be used for molds of bending machines.

Available Size

Round BarDiameter(mm): 6-800mm ,Length: 1000-9000mm or custom size
Plate/Flat/BlockThickness: 6mm-500mm , Width: 20mm-1000mm or custom size
Tolerance±1%,Thickness: +/-0.02mm, Width:+/-2mm

Description

42CrMo steel is a kind of Chinese alloy steel. It has high strength and toughness, good hardenability. After quenching and tempering treatment, it has a high fatigue limit and resistance to multiple impacts. And good low-temperature impact toughness.

Equivalent Grade

Chemical Composition

Steel GradeCSiMnPSCrMo
42CrMo0.38 to 0.450.17 to 0.370.50 to 0.80≤ 0.030≤ 0.0300.90 to 1.200.15 to 0.25

Mechanical Properties

  • Yield strength: ≥ 930 MPa
  • Tensile strength: ≥ 1080 MPa
  • Elongation: ≥12%
  • Rate of reduction in area: ≥45%
  • Impact absorbing energy: ≥ 63 J
  • Material Brinell hardness: ≤229 (Annealed or high temperature tempered steel rod)
  • Sample diameter: 25mm

Physical Properties

Heat Treatment Specification

  • First quenching heating temperature: 850 °C (Cooling – oil)
  • Tempering heating temperature: 560 °C (Cooling – water, oil)

Shapes and dimensions

Delivery Condition

Applications

It is making important parts requiring higher strength and larger size of the quenched section than 35CrMo steel.

  • For engineering steel.
  • Shafts,
  • Crankshafts,
  • Large gears for locomotive traction,
  • Supercharger gears,
  • Gearbox gears,
  • Engine cylinders,
  • Oil drill pipe joints,
  • Large load rods and
  • Spring clips.