Knowledge

42CrMo4 + QT steel, material No. 1.7225 (Standard EN 10083/3 // ISO 683/1 3) is a European standard alloy steel, usually delivered in tempered and quenched states. It possesses high strength, high toughness, excellent quenching performance, temper brittleness, high fatigue limit, good impact resistance after quenching and tempering, as well as low-temperature impact toughness. This steel is suitable for manufacturing medium and large-sized plastic molds, transmission gears, rear axles, bearing connecting rods, spring lock washers and deep oil well drill pipe joints that require certain strength and toughness.

 

Details of 42CrMo4 + QT Alloy Steel

Data Sheet and Specifications of 42CrMo4 Steel 1.7225 Material, 42CrMo4 Chemical Composition The following table shows the chemical composition of 42CrMo4 material.

 

Chemical Composition %

 

C：0.38-0.45%

Si：≤0.40%

Mn：0.60-0.90%

P：≤0.025%

S：≤0.035%

Cr：0.90-1.20%

Mo：0.15-0.30%

The mechanical properties of 42CrMo4 (1.7225) material under quenching and tempering conditions, and the properties of 42CrMo4 steel at room temperature.

 

Yield strength:

≥ 900 N/mm² (d ≤ 16mm, t ≤ 8mm)

≥ 750 N/mm² (16 < d ≤ 40mm, 8 < t ≤ 20mm)

≥ 900 N/mm² (40 < d ≤ 100mm, 20 < t ≤ 60mm)

≥ 900 N/mm² (100 < d ≤ 160mm, 60 < t ≤ 100mm)

≥ 900 N/mm² (160 < d ≤ 250mm, 100 < t ≤ 160mm)

Tensile strength:

1100 - 1300 N/mm² (d ≤ 16mm, t ≤ 8mm)

1000 - 1200 N/mm² (16 < d ≤ 40mm, 8 < t ≤ 20mm)

900 - 1100 N/mm² (40 < d ≤ 100mm, 20 < t ≤ 60mm)

850 - 950 N/mm² (100 < d ≤ 160mm, 60 < t ≤ 100mm)

750 - 900 N/mm² (160 < d ≤ 250mm, 100 < t ≤ 160mm)

Elongation:

≥10% (d ≤ 16mm, t ≤ 8mm)

≥11% (16 < d ≤ 40mm, 8 < t ≤ 20mm)

≥12% (40 < d ≤ 100mm, 20 < t ≤ 60mm)

≥13% (100 < d ≤ 160mm, 60 < t ≤ 100mm)

≥14% (160 < d ≤ 250mm, 100 < t ≤ 160mm)

Longitudinal Charpy-V notch impact strength:

≥ 35J (16 < d ≤ 250mm, 8 < t ≤ 160mm)

42CrMo4 + QT Hardness:

≥ 53 HRC (after flame or induction quenching)

Heat treatment

Quenching temperature: 820 - 880℃ (Austenitizing time: at least 30 minutes; Quenching medium: oil or water)

Tempering temperature: 540 - 680℃ (at least 60 minutes)

Termination of quenching test: 850 ± 5℃

Equivalent Materials of 42CrMo4: The 42CrMo4 material (1.7225 steel) is equivalent to the standards of ASTM AISI SAE, DIN, BSI, NF, ISO, JIS, and GB of Japan and China. (For reference) The equivalentdesignation of 42CrMo4

European Union: EN 10083-3 - 42CrMo4 (1.7225)

USA: AISI SAE; ASTM A29/A29M - 4140

China: GB/T 3077 - 42CrMo

Japan: JISG 4105 - SCM440

ISO: ISO 683-18 - 42CrMo4

 

Vigor team have rich experience on sectio material machining and die-forging of 42CrMo4. If any question or any demands we can help, please feel free to contact us at info@castings-forging.com