20MnCr5 (1.7147) Alloy Steel
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20MnCr5 are low alloyed engineering case hardening steel for parts which require core tensile strength of 1000 – 1300 N/mm² and good wearing resistance. It is similar to 16MnCr5, but it is more hardening and it can also have good characteristics for what concerns the centre, up to a diameter of more or less mm 50. It is used in boxes, piston bolts, spindles, camshafts, gears, shafts and other mechanical controlling parts.
Chemical Composition
| C | Si | Mn | P | S | Cr |
| 0.17 - 0.22 | max 0.4 | 1.1 - 1.4 | max 0.025 | max 0.035 | 1.0 - 1.3 |
Heat treatment Process
Soft Annealing
Heat to 650 - 700 ℃.
Carburizing
Temperature 900 - 950 ℃ . Cooing from carburizing temperature: water, oil, air, thermal bath, cooling box.
Hardening
Core hardening 850 – 880 ℃. Case hardening: 810 - 8400C. Quenching media: water, oil, air, thermal bath.
Tempering
Tempering temperature : 170 - 200 ℃.
Forging
Hot Forming temperature: 1100 - 850 ℃.
Equivalent Grades
| QUALITY | EUROPE | GERMANY | FRANCE | SPAIN | G.B. | USA | |
|---|---|---|---|---|---|---|---|
| EN | DIN | W.n. | AFNOR | UNE | B.S. | AISI/SAE | |
| 20MnCrS5 | 20MnCrS5 | 20MnCrS5 | 1.7147 | 20MC5 | |||
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