Ming Yuan Metal Products Co., Ltd. supply of imported steel, LD2, LD2 mold cold work die steel the LD2 mold steel prices 

 The LD2 new cold work die steel 
 (1) LD2, mold steel Features 7Cr7Mo3V2Si steel code LD2, high toughness special wear Die Steel. The domestic development of cold work die steel. The steel as the basic steel type of mold steel, toughness, compressive strength, flexural strength, abrasion resistance. 
 (2) Availability state annealed. 
 (3) LD2MJG chemical composition (wt%) C 0.70 ~ 0.80, Si 0.70 to 1.20, Mn ≤ 0.50, Cr 6.50 ~ 7.50, Mo, 2.00 ~ 3.00. 
 (4) thermal processing regulating the heating temperature of 1120 ~ 1140 ° C, initial forging temperature of 1100 ~ 1200 ℃, the final forging temperature ≥ 850 ° C, after forging cooling cold sand. 
 (5) such as temperature annealing specification heating temperature of 850 ℃ ± 10 ° C, time 2 ~ 3h, furnace cold to a temperature 540 ℃ ± 10 ℃, 4 ~ 6h slow cold to a temperature ≤ 600 ℃, cooled baked, hardness 210 ~ 240HBS . 
 (6) LD2, mold steel quenching and tempering specification 
 ① quenching temperature of 1100 ° C ± 10 ° C, the 25s/mm heat insulation, oil quenching. Tempering temperature of 540 ° C ± 10 ° C for the first time, time is 2h, air cooling; second tempering temperature of 540 ° C ± 10 ° C, time 1.5h. Hardness of 59 ~ 62HRC. 
 ② quenching temperature of 1100 ~ 1150 ℃, oil quenching, tempering temperature of 550 ~ 570 ℃, time 1 ~ 2h, tempering the number 2 or 3 times. Hardness of 58 ~ 60HRC. 
 (7) gas nitriding and gas nitrocarburizing specification 
 ① Technical requirements: Hardness> 900HV depth of 0.03 ~ 0.05mm, nitriding temperature of 540 ° C, the gas ratio of 30% ammonia, containing gas (RX gas) 70%, 30% to 40% of the ammonia decomposition rate and holding time of 3h. used in the cold extrusion die, stamping die, cold heading die. 
 ② technical requirements: Hardness> 1000HV depth of 0.05 ~ 0.07mm, nitriding temperature of 540 ° C, the gas ratio of 40% ammonia, containing gas (RX gas) 50%, 30% to 40% of the ammonia decomposition rate and holding time of 5h. used in drawing die, and flexural modulus. 
 LD2, mold steel (8) Examples of typical application 
 ① The steel is a cold work die steel, such as cold extrusion die, stamping die, cold heading die, drawing die, bending die. 
 ② The steel can also be used to make plastic mold steel.