4Cr13 Standard: GB / T 1220-1992 

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 4cr13 Introduction 
 ● Features and Scope: 4Cr13 properties after quenching hardness higher than 3Cr13, good corrosion resistance. Use for cutting tools, nozzle, valve seats and so on. 1Cr17Ni2 features strong corrosion resistance to nitric acid and organic acids. Use as high hardness and high wear resistance of heat pumps, valves, valve bearings, medical devices, such as spring components. 

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 Chemical composition 
 ● Chemical Composition: C: 0.36 ~ 0.48 Si Si: ≤ 0.60 Manganese Mn: ≤ 0.80 S S: ≤ 0.030 P P: ≤ 0.035 Cr-Cr: 12.00 ~ 14.00 Ni: to allow containing ≤ 0.60 

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 Mechanical Properties 
 ● Mechanical Properties: Hardness: Annealed,, ≤ 201HB, indentation diameter of 3.9 ~ 4.3mm; quenching, ≥ 50HV ● Heat treatment and microstructure specifications: Heat treatment specifications: 1) annealing, 800 ~ 900 ℃ 750 ℃ ??slow cooling or fast about cold; 2) quenching, 1050 ~ 1100 ℃ oil cooling; 3) temper, 200 ~ 300 ℃ fast-cooling. Microstructure: Organizing for the martensite type. [1] [2] 

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 Delivery Status 
 ● Delivery status: Delivery of steel in the annealed condition. Forging: Cold oil quenched die steel has some cracking susceptibility, forging heating should not be heated quickly, preferably in a warm-up to 650-750 degrees, forging heating temperature of 1130-1150 degrees, the final forging temperature should be greater than 800 - 850 degrees, take the upper limit of steel ingot forging temperature. Lower temperature when you get blank forging Annealing: annealing usually use 780-800 degrees, heat 4-6 hours to ≤ 50 degrees / hour, cooled to 550 degrees baked air-cooled, isothermal annealing using 700-800 degree heat 2-4 sales, then then 670-720 degree heat, to keep 2-4 hours to ≤ 50 degrees / hour cooling rate, cooling air-cooled baked to 500 degrees, annealed hardness of 241-197HB