| Type: | Alloy Steel Bar |
|---|---|
| Special Use: | Mold Steel |
| Application: | Die Steel Bar |
| Technique: | Hot Rolled |
| Standard: | ASTM |
| Alloy Or Not: | Is Alloy |
Quick Details
Specifications
Heat Treatment
* Annealing: Heat to 800 oC 850 oC, hold until temperature is uniform throughout the section and cool in furnace.
* Hardening:Heat to 830 oC 860 oC, hold until temperature is uniform throughout the section, soak for 10 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.
* Stress Relieving:Heat to 600 oC 650 oC, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.
* Tempering:Re-heat to 450 oC 660 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air. N.B. Tempering should be avoided if possible within the range 250 oC 450 oC due to temper brittleness.
Machinability
30CrNiMo8Steel in the hardened and tempered as supplied condition is still regarded as being readily machinable and operations such as turning and drilling etc. Can be carried out satisfactorily using machine manufacturers, recommendations for suitable tool type feeds and speeds.
Welding
Welding of30CrNiMo8Steel in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, as the mechanical properties will be altered within the weld heat affected zone. It is preferred that welding be carried out on30CrNiMo8Steel while in the annealed condition, and that the work piece, immediately on cooling to hand warm, is then stress relieved at 640 oC 660 oC prior to hardening and tempering.
If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be if possible stress relieved at 15 oC below the original tempering temperature (if known).
Mills test certificate
EN 10204/3.1 with all relevant data reg. chem. Composition, mech. Properties and results of testing.
* Annealing: Heat to 800 oC 850 oC, hold until temperature is uniform throughout the section and cool in furnace.
* Hardening:Heat to 830 oC 860 oC, hold until temperature is uniform throughout the section, soak for 10 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.
* Stress Relieving:Heat to 600 oC 650 oC, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air.
* Tempering:Re-heat to 450 oC 660 oC as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of section, and cool in still air. N.B. Tempering should be avoided if possible within the range 250 oC 450 oC due to temper brittleness.
Machinability
30CrNiMo8Steel in the hardened and tempered as supplied condition is still regarded as being readily machinable and operations such as turning and drilling etc. Can be carried out satisfactorily using machine manufacturers, recommendations for suitable tool type feeds and speeds.
Welding
Welding of30CrNiMo8Steel in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, as the mechanical properties will be altered within the weld heat affected zone. It is preferred that welding be carried out on30CrNiMo8Steel while in the annealed condition, and that the work piece, immediately on cooling to hand warm, is then stress relieved at 640 oC 660 oC prior to hardening and tempering.
If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be if possible stress relieved at 15 oC below the original tempering temperature (if known).
Mills test certificate
EN 10204/3.1 with all relevant data reg. chem. Composition, mech. Properties and results of testing.