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Alloy steel is steel alloyed with a variety of elements in total amounts of between 1.0% and 50% by weight to improve its mechanical properties. Alloy steels are broken down into two groups: low alloy steels and high alloy steels. The difference between the two is somewhat arbitrary: Smith and Hashemi define the difference at 4.0%, while Degarmo, et al., define it at 8.0 %.[1][2] Most commonly, the phrase "alloy steel" refers to "low alloy" steels.
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Home » Stainless Steel » Product introduction
070M55
- Numbers: 20101221025
- Model: 070M55, BS970
- Producers: China
- Update time: 2010.12.21
- Browse:
Product Description:
070M55 is available from stock in bar and can be cut to your requirements. We also offer 070M55 plate flame cut to your required sizes and normalised.
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TYPICAL ANALYSIS |
070M55 |
|
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|
C. |
Si. |
Mn. |
S. |
P. |
|
0.55% |
0.25% |
0.70% |
0.015% |
0.015% |
Forging:
Heat slowly and uniformly to 1100°C. After forging cool slowly.
Annealing:
Heat uniformly to 700°C. Soak well and cool slowly in the furnace.
Hardening:
Heat uniformly 070M55 to 820/840°C until heated through. Quench in oil, or water.
Tempering:
Heat uniformly and thoroughly the 070M55 tool at the selected tempering temperature, between 550/660°C and hold at heat for one hour per inch of total thickness.
Hard Chromium Plating:
After hard chromium plating, the 070M55 should be tempered for approximately 4 hours at 180°C, in order to avoid hydrogen embrittlement.
Welding:
Firstly heat to approximately 100-350°C. Use an unalloyed basic electrode, for welding unalloyed structural steels.
Normalising:
Normalise at 840-870°C, and cool in air.
Stress Relieving:
After rough machining 070M55 tools should be stress relieved. Soaking time 2 hours after the whole piece has attained a temperature of approximately 675°C. Cool in furnace to approximately 500°C, and then freely in air.
070M55 Physical Properties:
Density Coefficient of Thermal Expansion Modulus of Elasticity kg/m per c from 20 c N/mm 7800 11.6x10-6 206000
