42Cr2Mo steel is a super high strength steel with high strength and toughness, good hardenability, no obvious temper brittleness, small deformation during quenching, high fatigue limit and multiple impact resistance after quenching and tempering, good impact toughness at low temperature, high creep strength and endurance strength at high temperature. Surface hardening after quenching and tempering is usually used as heat treatment scheme for this steel. Suitable for manufacturing large and medium-sized plastic moulds requiring certain strength and toughness.
Introduction
42CrMo steel is a Chinese alloy steel, and has high strength and toughness, good hardenability, and no obvious temper brittleness. After quenching and tempering treatment, it has high fatigue limit and resistance to multiple impacts, and good low temperature impact toughness.
Applications
42CrMo alloy steel generally used for engineering steel purpose, and for making important parts requiring higher strength and larger size of the quenched section than 35CrMo steel, such as shafts, crankshafts, large gears for locomotive traction, supercharger gears, gearbox gears, engine cylinders, oil drill pipe joints, large load rods and spring clips.
Datasheet
42CrMo Steel Chemical Composition
Chemical Composition % Steel Grade C Si Mn P S Cr Mo 42CrMo 0.38 to 0.45 0.17 to 0.37 0.50 to 0.80 ≤ 0.030 ≤ 0.030 0.90 to 1.20 0.15 to 0.25 42CrMo Alloy Steel 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
Heat treatment specification
- First quenching heating temperature: 850 °C (Cooling – oil)
- Tempering heating temperature: 560 °C (Cooling – water, oil)
Equivalent
42CrMo steel equivalent to US AISI ASTM, European EN (Germany DIN EN, UK BSI EN, France NF EN, Japan JIS, and ISO standard.
China USA Germany UK Japan France ISO Standard Grade Standard Grade Standard Grade (Steel number) Standard Grade (Steel number) Standard Grade Standard Grade (Steel number) Standard Grade GB/T 3077 42CrMo SAE, AISI;
ASTM A29/A29MAISI 4140 steel DIN EN 10083-3 42CrMo4 (1.7225) BS EN 10083-3 42CrMo4 (1.7225) JIS G4105 SCM440 NF EN10083-3 42CrMo4 (1.7225) ISO 683-17 43CrMo4 You may also be interested in 42crmo vs 4140, 42CrMo4 (EN 1.7225) Steel
What’s The Difference Between 42CrMo And 42CrMo4
42CrMo is a kind of medium-carbon alloy structural steel with good comprehensive performance and good hardenability. It is often used to manufacture gear, connecting rod, high strength bolt and other important parts in machining process. The engineers often saw a material of 42CrMo4 mentioned in the European standard drawings. Is it be alternative with 42CrMo? What are the differences between them and their characteristics? We hereby discuss in depth from the terms of chemical analysis, mechanical properties and hardenabilit to find out the conclusion.
1. They come from different standards from different counties. 42crmo is the material in Chinese standard GB/T 3077, specification of alloy structural steel. The material of 42CrMo4 belong to EN 10083 series, hardened and tempered steel.
2. Chemical composition difference. There are tiny difference in content of element Si shown in the figure below, the Si content in 42CrMo is small than that in EN10083. In addition, according to GB3077, P and S content can be divided into three levels, while EN10083 only limits its maximum content.
Steel grades
C
Si
Mn
P max
S max
Cr
Mo
42CrMo
0.38-0.45
0.17-0.37
0.5-0.8
0.035
0.035
0.9-1.2
0.15-0.25
42CrMo4
0.38-0.46
0.40 max
0.5-0.8
0.035
0.035
0.9-1.2
0.15-0.25
42CrMo quality levels
P
S
Quality
0.035
0.035
High quality
0.025
0.025
Super quality
0.025
0.015
2. Different hardenability requirements. The hardenability of GB3077 has no the specific value of the bandwidth of quenching. The buyer and the supplier may discuss a solution on their own if has special requirements. The specific value of hardened bandwidth is specified in EN10083, which is divided into three grades H,HL,HH for reference when ordering.
3. Different delivery condition. 42CrMo tubing is usually delivered in the condition of hot rolled and hot forging. If the customer needs the heat treatment condition (annealing, normal goods, high temperature tempering), it shall be specified in the contract. For EN10083 42CrMo4 tubing, there are five delivery conditions for choice: no heat treatment, heat treatment, softening annealing, quenching and high temperature tempering and other heat treatment.
4. Impact test requirements difference. When doing the impact test according to GB/T2975, 42CrMo sampling in the 1/4 of the outer diameter of the bar as the center of bar when diameter is greater than 50mm. When the diameter of the sample rod is 25mm, it shall be modulated according to the requirements of heat treatment process, and then the tensile test specimen shall be tested. In the EN10083 standard, the bar is first tempered in accordance with the recommended heat treatment. And when the sampling the bar which diameter is greater than 25mm, the sampling position should be centered 12mm around the outer diameter of the bar. In addition, 42CrMo uses the Charpy U-notch toughness, while the 42CrMo4 uses the charpy V testing. The two notch has the same depth but the different radius of the notch bottom(U type 1mm,v type 0.25mm).
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