"Beijing Siu promise commerce, Co., Ltd. 

 Standard: GB / T 1220-1992 
 Corresponds to the German grade: X40Cr13 
 Corresponds to the French grades: Z40C14 

 Feature 
 The 4Cr13 features than 3Cr13 after quenching high hardness, good corrosion resistance. 

 Use 
 Cutlery, nozzle, valve seat. 1Cr17Ni2 

 Feature 
 Strong resistance to nitric acid and organic acid corrosion. Use as a high hardness and high wear resistance, heat pumps, valves, valves, bearings, medical devices, springs and other parts. 4cr13 picture 

 Chemical composition 
 Carbon C: 0.36 ~~ 0.45 
 Silicon Si: ≤ 0.60 
 Mn Mn: ≤ 0.80 
 Sulfur S: ≤ 0.030 
 Phosphorus P: ≤ 0.035 
 Chromium Cr: 12.00 ~ 14.00 
 Ni: to allow containing ≤ 0.60 

 Mechanical properties 
 Hardness: Annealed ≤ 201HB, indentation diameter 3.9 to 4.3mm; quenching, ≥ 50HV 
 Heat treatment and microstructure: 
 Heat Treatment Specification: 
 1) annealing 800 to 900 ℃ slow cooling, or about 750 ℃ ??rapid cooling; 
 2) quenching oil cooling, 1050 ~ 1100 ℃; 
 3) tempering the rapid cooling from 200 to 300 ℃. 
 Microstructure: the organization is characterized by a martensitic. 

 Delivery status 
 Delivery of steel in annealed condition. Forging some cracking susceptibility: oil quenching, cold work die steel forging heating should not be rapidly heated, preferably 650-750 degrees, a warm-up, forging heating temperature of 1130-1150 degrees, and the final forging temperature should be greater than 800 - take the upper limit temperature of 850 degrees, ingot forging. Take the lower limit temperature in the billet forging 
 Annealing 
 The general annealing 780-800 °, holding for 4-6 hours to ≤ 50 / h, cooled to 550 degrees baked the air-cooled, such as temperature annealing 700-800 insulation 2-4 sales, then 670-720 degrees of insulation, keeping 2-4 hours to ≤ 50 degrees / hour cooling rate of cooling to 500 degrees, cooled baked annealed hardness of 241-197HB 
 Heat treatment: 
 Good oxidation resistance of the steel, long-term use 600 ~ 650 ℃. 
 The 4Cr13 heat treatment of steel projects annealing quenching and tempering 
 Heating temperature / ℃ 
 Cooling 750 ~ 800 
 Furnace cooling 1050 to 1100 
 Oil-cooling from 200 to 300 
 Air-cooled 

 Hardness: annealing 240 ~ 197HB, quenching, ≥ 50HRC 

 Tel: 15210733715 (Miss Zheng) 
 010-84329660 
 http://bjzhaonuo.com.cn/ (gifted Steel Miss Zheng) 

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