Steel 20MnCr5 (material DIN 1.7147)
20MnCr5 steel (material 1.7147) is a European standard carburized steel (hardening steel) with high strength and toughness and good hardenability. The quenching deformation is small, the low temperature toughness and machinability are good, but the welding performance is poor. It is generally used after carburizing quenching or quenching and tempering. (For specifications and datasheet, see tables below)
1.7147 steel is used to manufacture and refill large-section hardened parts and small-section carburized parts. It can also be used in the manufacture of medium and small parts with medium load and low impact, such as gears, shafts, spindles, friction wheels and gears of variable speed equipment, and governor sleeve, etc.
(1.7147) Chemical Composition of 20MnCr5 Steel
The chemical composition of 20MnCr5 steel is presented in the following table.
| Chemical composition % | |||||||
| Standard | Steel Grade | W | Si ≤ | Mn | P ≤ | S ≤ | Cr |
| EN 10084 | 20MnCr5 1.7147 |
0.17-0.22 | 0.40 | 1.10 to 1.40 | 0.025 | 0.035 | 1h00-1h30 |
| EN 10084 | 20MnCrS5 1.7149 |
0.17-0.22 | 0.40 | 1.10 to 1.40 | 0.025 | 0.020-0.040 | 1h00-1h30 |
Mechanical Properties of Steel (20MnCr5) 1.7147
1.7147, 20MnCr5 Material Brinell Hardness
- Treated for cold shear: ≤ 255 HBW
- Soft annealed: ≤ 217 HBW
- Treated Hardness: 170-217 HBW
- Treated with ferrite-pearlite structure and hardness: 152-201 HBW
- Standardized: 140-201 HBW
20MnCr5, 1.7147 Tensile strength (after hardening and tempering at 200 °C)
- Dia. ≤ 16mm: Min. 1200 MPa
- 16 < Dia. ≤ 40 mm: Min 900 MPa
- 40 < Dia. ≤ 100mm: Min 700 MPa
Steel Heat Treatment Specification 1.7147
- Final hardening test Austenitizing temperature: 870°C (30-35 minutes)
- Carburizing Temperature: 880-980 ℃
- Core hardening temperature: 860-900 ℃
- Hardening temperature: 780-820 ℃
- Quenching: 150 – 200 ℃ (≥ 1 hour)
Equivalence
EN 20MnCr5, steel 1.7147 equivalent to ISO, US ASTM AISI SAE, Germany DIN, British BSI, France NF, Japanese JIS and Chinese standard GB. (For reference)
| 20MnCr5, equivalent to 1.7147 | |||||||||||||||
| European | USA | Germany | UK | France | ISO | China | Japan | ||||||||
| Standard | Note | Standard | Note | Standard | Note | Standard | Note | Standard | Note | Standard | Note | Standard | Note | Standard | Note |
| EN 10084 | 20MnCr5; 1.7147 |
ASTM A29/A29M | 5120 | DIN EN 10084 | 20MnCr5 (1.7147) |
EN 10084 | 20MnCr5 1.7147 |
NF EN 10084 | 20MnCr5 1.7147 |
ISO 683-11 | 20MnCr5 | GB/T 5216; GB/T 3077 |
20CrMnH; 20CrMn |
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(a): The chemical composition presents major differences compared to EN 10084.
