45号钢热处理（Heat treatment of No. 45 steel）.docVIP

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45号钢热处理（Heat treatment of No. 45 steel）.doc

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45号钢热处理（Heat treatment of No. 45 steel） One No. 45 steel requires hardness HRC40-50, is it necessary to quench + low temperature tempering? Conversion to Brinell hardness is about 380 ~ 470HB, according to the general heat treatment standards, the heat treatment system and hardness relationship is approximately as follows: Quenching temperature: water quenching at 840 DEG C The tempering temperature of 150 DEG C: tempering hardness of about 200 DEG 57HRC; tempering, the hardness is about 250 DEG 55HRC; tempering, the hardness is about 300 DEG 53HRC; tempering, the hardness is about 350 DEG 48HRC; tempering, the hardness is about 400 DEG 45HRC; tempering, the hardness is about 43HRC; tempering hardness of about 500 degrees. 33HRC; 600 DEG C tempering, the hardness is about 20HRC In general, the heat treatment process refers to the standard range of the intermediate component, and the heat treatment temperature there is a range of adjustment, such as ingredients in the range of deviations, can be adjusted accordingly quenching temperature and tempering temperature Two 1. critical temperature refers to the austenitic transformation temperature of steel. Different steel content has different critical points, but the critical point has a range of floating, so the lower critical point temperature refers to the lowest temperature of the austenite transformation. 2. critical point of common carbon steel In accordance with the critical point (c) 20 steel 735-855 (DEG C) 45 steel 724-780 (DEG C) T8 steel 730-770 (DEG C) T12 steel 730-820 (DEG C) 3, 20Cr, 40Cr, 35CrMo, 40CrMo, 42CrMo: normalizing temperature is 850-900, steel No. 45 normalizing temperature is about 850 DEG C. 4, 20CrMnTi, Ac1, Ac3, Ar1, Ar3 740825680730 Five Cr12MoV knowledge of heat treatment Cr12MoV steel is a high carbon high chromium martensitic steel, commonly used in cold working die, the carbon content lower than Cr12 steel. The steel has a high hardenability and can be fully quenched below 300mm. The v