9crwmn die steel made tool steel: 9CrWMn standard: GB / T 1299-1985 ● Features and Scope: cold die steel, performance, purposes and CrWMn of nearly Chemical composition ● Chemical Composition: Carbon C: from 0.85 ~~ 0.95 Si Si: ≤ 0.40 Manganese Mn: sulfur from 0.90 ~~ 1.20 S: ≤ 0.030 Phosphorus P: ≤ 0.030 Shanghai Kai Xinte steel images Chromium Cr: 0.50 ~ 0.80 Ni: to allow the residual content of ≤ 0.25 Cu: allow the residual content of ≤ 0.30 Tungsten W: 0.50 to 0.80 Mechanical Properties: Hardness: annealing, 241 ~ 197HB, indentation diameter 3.9 to 4.3mm; quenching, ≥ 62HRC Shanghai Kai Xinte steel picture ● Heat and microstructure specifications: Heat treatment specifications: quenching, 800 ~ 830 ℃ oil cooling. ● Delivery status: Delivery of steel in annealed condition. Cold work die steel forging process forging: oil quenching some cracking susceptibility, should not be heated rapidly forging heating, preferably in the 650-750 degrees once preheated, forging heating temperature of 1130-1150 degrees, the final forging temperature should be greater than 800-850 degrees, forging steel ingot to take maximum temperature. Billet forging takes minimum temperature of Shanghai 锴 Xinte images annealing process of annealing steel: Usually annealing 780-800 degrees, and incubated for 4-6 hours at ≤ 50 degrees / hour, cooled to 550 degrees baked cooled, isothermal annealing using 700 - incubated at 800 degrees for 2-4 hours, and then incubated at 670-720 degrees, holding for 2-4 hours, to ≤ 50 ° / hr cooling rate was cooled to 500 degrees baked cooled, the annealed hardness 241-197HB physical properties 9CrWMn of. steel critical temperature shown in Table 2-12-1. 9CrWMn steel critical temperature critical point the Ac1 Acm Arl Ms temperature characteristics of the (approximate) / ° C 750 900 700 205 9CrWMn steel mold, low alloy cold work die steel. The steel has quench permeability and wear resistance, small deformation quenching, uniform particle size distribution of carbides. 9CrWMn mold steel commonly used in the manufacture of cross-section the complex shape Die and various amount regulation measuring tools.