25CRMO4/DIN 1.7218 QUALITY ALLOY STEEL
25CrMo4 steel is a chromium-molybdenum low-carbon alloy structural steel, which can be found in the standards of major European countries((such as EN10083, EN10250).
After heat treatment, 25CrMo4 steel has high strength and toughness. Due to its excellent mechanical properties and machinability, it has become an important material in the fields of aviation, aerospace, automotive industry and machinery manufacturing.
25CrMo4 steel also has excellent corrosion resistance and heat resistance, making it very durable in various harsh environments, such as in marine engineering, oil field drilling and construction.
25CRMO4 | DIN 1.7218 Chemical Composition |
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| National Standard |
Grade | C | Si | Mn | Cr | Mo | P | S |
| EN10083 | 25CrMo4 | 0.22-0.29 | ≤0.4 | 0.6-0.9 | 0.9-1.2 | 0.15-0.3 | ≤0.025 | ≤0.035 |
| ASTM A29 | 4130 | 0.28-0.33 | 0.15-0.35 | 0.4-0.6 | 0.8-1.1 | 0.15-0.25 | ≤0.035 | ≤0.04 |
| JIS G4105 | SCM430 | 0.28-0.33 | 0.15-0.35 | 0.6-0.85 | 0.9-1.2 | 0.15-0.3 | ≤0.035 | ≤0.04 |
| GB 3077 | 30CrMo | 0.26-0.34 | 0.17-0.37 | 0.4-0.7 | 0.8-1.1 | 0.15-0.25 | ≤0.035 | ≤0.035 |
25crmo4 /DIN 1.7218 Steel Physical Property
| Density | Specific heat capacity | Thermal conductivity | Poisson's ratio | Elastic Modulus | Shear modulus |
| 7.87 g/cm3 | 570 J/(kg·℃)(25~100℃) | 47 W/m·℃（105℃） | 0.28 | 21500 Mpa | 83500 Mpa |
| Melting point | Ac1 | Ac3 | Ar1 | Ar3 | Ms |
| 1420℃ | 757℃ | 807℃ | 693℃ | 763℃ | 345℃ |
25crmo4 /DIN 1.7218 STEEL Forging
- Initial Forging Temperature：1150℃
- Final Forging Temperature： >850℃
- Forging Ratio：above 4:1
- Post-Forging Treatment:Cooling in sand slowly or furnace cooling after forged is recommended.For 25CrMo4 steel that needs to be quenched and tempered in the end, normalizing after forging is also the recommended method.
25crmo4 /DIN 1.7218 STEEL HEAT TREATMENT
- Annealing:830 – 850°C, furnace cooling ,hardness below 229 HBW
- Normalizing:870-900°C,air cooling
- High Temperature Tempering：700-720°C.The purpose is to soften the material,hardness below 250 HBW.
- Quenching:850-880°C, oil/water, quenching hardenss: 49-56HRC.
- Tempering:600-680°C
25CrMo4 Steel Tempering Temperature Vs Hardness
Grade | Quenching Temperature,ºC | Tempering Temperature,ºC | ||||||
| 315ºC | 370ºC | 430ºC | 480ºC | 540ºC | 600ºC | 650ºC | ||
| 25CrMo4 | 840ºC | 46 | 44 | 42 | 39 | 36 | 30 | 25 |
Quality Certification for 25CRMO4/DIN 1.7218 STEEL
A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.NDE test method/criteria
Supply Size & Condition For 25CRMO4/DIN 1.7218 STEEL
- Round Bars: Dia.80 – 1,000mm as Forged
- Flat / Square Bars: Thickness Max.800mm
- Shafts, Rollers, Blocks: Customized or According to Drawing
- Rolled Round Bars: Dia.14 – 220mm with UT Assurance
Heat treatment:Quenched and Tempered (+QT), Normalizing (+N), Annealing (+A)
Surface finish:Black / Rough turned / Peeled
25CrMo4/DIN 1.7218 steel manufacturers and suppliers,supplied with round rods,square/flat bars,rollers,shafts,blocks and forging pieces.
