Reference standard
EN 10250-3: 2000 Open steel die forgings for general engineering purposes. Alloy special steels
Application
China 33NiCrMoV14-5-Alloy steel are widely used in the filed of ship, vehicle, airplane, guided missile, weapons, railway, bridges, pressure vessel, machine tools, mechanical components with a bigger sectional size and so on.
Chemical composition
| C | Si | Mn | Ni | P | S | Cr | Mo |
| 0.26 – 0.34 | max 0.4 | 0.5 – 0.8 | 1.8 – 2.2 | max 0.025 | max 0.035 | 1.8 – 2.2 | 0.3 – 0.5 |
Equivalent Grades of Steel 30CrNiMo8(1.6580)
| EU | Germany | Japan | France | England | China | Russia | Inter |
| EN | DIN,WNr | JIS | AFNOR | BS | GB | GOST | ISO |
| 30CrNiMo8 | 30CrNiMo8 | SNCM431 | 30CND8 | 823M30 | 30Cr2Ni2Mo | 3KH3M3F | 31CrNiMo8 |
Size Tolerance
| Surface Finish | Size Tolerance | Length |
| Black For Forged condition | (0，+5 ~ +8mm) | Multiple Length/Fixed Length |
| Black For Rolled condition | (0，+1mm) | |
| Rough Turned | (0，+3mm) |
Mechanical properties
- Tensile Strength:min 847 N/mm2
- Yield Strength:min. 824 N/mm2
- Elongation:min.12 %(l)
- Kv-Imapct value:min.23J (l)
Heat Treatment Conditions
- +A Soft annealed/Soft annealing
- +N Normalized/Normalizing
- +QT Quenched and Tempered
- +U Untreated
- +SR Stress Relieved
Normalizing:870℃-880℃,Cool in air
Soft Annealing:650℃-700℃,Cooling 10℃ per hour in furnace,max. 248 HB
Stress Relieving:50°C under the temperature of tempering
Hardening:830 – 860°C,oil or polymer,840-850°C,water
Tempering:540°C – 660°C, cool in still air
Drawn and hot-rolled bars, flat bars 30CrNiMo8, 1.6580
Forgings and forged bars in grade 30CrNiMo8, 1.6580
