Mold steel 0Cr17Ni7Al properties, chemical composition, heat treatment (2010/08/14 08:08)
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0Cr17Ni7Al austenitic steel is semi precipitation hardening stainless steels is based on adding Cr17Ni7 strengthening elements Al and developed into.
Characteristics ⒈0Cr17Ni7Al steel
⑴, 0Cr17Ni7Al steel added Al element is mainly the formation of intermetallic compound Ni3Al precipitates in the martensitic matrix, resulting in precipitation strengthening.
⑵, 0Cr17Ni7Al steel after solution treatment at room temperature for a small amount of austenite and ferrite. This steel after solution treatment and austenitic stainless steels have the same good cold deformation, large deformation can be affected by cold stamping.
⑶, 0Cr17Ni7Al steel after cold plastic deformation or cold treatment or tempering obtained martensite, resulting in strengthened further by aging precipitation.
⑷, 0Cr17Ni7Al nitriding steel may be treated to improve the strength of the steel surface hardness, wear resistance, corrosion resistance and seizure resistance.
⑸, 0Cr17Ni7Al steel metallurgy high quality requirements, good purity, mirror polishing and etching processing performance is superb performance period, time distortion, die size is easy to ensure accuracy, good weldability, uniform hardness and outside.
⑹, 0Cr17Ni7Al steel after solution treatment, obtain austenite and ferrite microstructure, hardness is less than 229HBS, plastic, easy-to-die cold extrusion process, the cold hardness of 38 ~ 40HRC, after re-aging treatment, precipitation between carbide and metal elements Cr compounds, hardness rose to 42 ~ 48HRC, good mechanical properties.
⒉0Cr17Ni7Al main chemical composition of steel
≤0.09% C, ≤1.00% Mn, 6.50% ~ 7.50% Ni, 16.00 ~ 18.00% Cr, 0.75% ~ 1.50% Al, ≤0.50% Cu, ≤1.00% Si, ≤0.030% P, ≤0.030% S.
Steel heat treatment process ⒊0Cr17Ni7Al
0Cr17Ni7Al steel initial forging temperature 1150 ~ 1150 ℃, the final forging temperature of 1000 ℃, air cooling after forging cooling or sand.
0Cr17Ni7Al common heat treatment of steel
Treatment process parameters hardness process characteristics
Solution treatment heating 1050 ℃, insulation, water-cooled or air-cooled ≤229HBS
Cr, Ni, Al, Cu, Si, Mn elements dissolved in austenite, get a small amount of austenite + ferrite After cooling, prepare for the aging precipitation to organize
Secondary aging secondary aging treatment: heating 760 ℃, insulation .5h, air-cooled heat carbide precipitation when heated from austenite to enhance martensitic transformation point, austenite into martensite during cooling
  Secondary aging: Heat 560 ℃, insulation 1.5h, air-cooled heat 43HRC intermetallic precipitates when the heat from the martensite and austenite, precipitation strengthening
Aging treatment + cold + aging treatment once Aging: Heat 950 ℃, insulation 1.5h, when the air-cooled heat insulation carbide precipitation from austenite to enhance martensitic transformation point, austenite into martensite during cooling
  Cold treatment: cooling temperature -73 ℃, insulation 8h, air-cooled because Mf point of about -80 ℃, the cold handle large austenite into martensite
  Secondary aging: Heat 510 ℃, insulation 1h, air-cooled heat 48HRC intermetallic precipitates when the insulation from the martensite and austenite, precipitation strengthening
Gas nitriding nitriding temperature 510 ~ 520 ℃, insulation 48h, furnace extravagance 194 ~ 490Pa, ammonia flow 0.4m3 / h, air cooling or oil cooling 966HV
Improve the surface fatigue strength, hardness, wear resistance, corrosion resistance and heat resistance
Applications ⒋0Cr17Ni7Al Steel
0Cr17Ni7Al steel is mainly suitable for manufacturing corrosion, wear, high-precision plastic mold