DIN 20MnCr5/AISI 5120
20MnCr5 also refers to DIN 1.7147 in European standard EN10084. As a representative steel of Cr Mn carburizing steel, it has high strength and toughness, small deformation after quenching, good hardenability, and low 20MnCr5 has good machinability, but poor welding performance.
Designation by Standards
| Brand Name | Ravne No. | Mat. No. | DIN | EN | AISI |
| ZF7b | 767 | - | 20MnCr5 | - | 5120 |
Chemical Composition (in weight %)
| C | Si | Mn | Cr | Mo | Ni | V | W | Others |
| 0.18 | max. 0.40 | 1.15 | 1.15 | max. 0.12 | max. 0.30 | - | - | max.Al=0.035. max.Cu=0.30 |
Applications
Higher stressed components for automobile industry – gears, shafts, crankshafts, connecting rods, cam shafts, etc.
Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 210
Density [g/cm3]: 7.85
Soft Annealing
Heat to 680-710oC, cool slowly. This will produce a maximum Brinell hardness of 217.
Intermediate Annealing
Temperature: 620-650oC.
Carburizing
Temperature: 850-880oC.
Hardening
Harden from a temperature of 810-840oC followed by oil quenching or hot quenching 180-220oC.
Tempering
Tempering temperature: 150-180oC.
Forging
Hot forming temperature: 1050-850oC.
Machinability
Component parts for the automobile industry – shafts, steering and driving parts.
Forms manufactured: Please see the Dimensional Sales Program.
Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other purposes. There is no representation that the recipient of this literature will receive updated editions as it become available.
