7Cr7Mo2V2Si (LD)
Code LD (LD-1). On five 7Cr7Mo2V2Si die steel, high strength and toughness of a cold die steel.
Features:
Maintain a high toughness of the steel in the case. On five 7Cr7Mo2V2Si tool steel, the compressive strength, flexural strength, wear resistance than 65MnV good, LD series is the most widely used steel.
Uses:
Widely used in manufacturing cold forging, cold stamping, cold, cold, etc. with the impact, bending stress is large. 7Cr7Mo2V2Si on five die steel, and requires various types of cold-working die wear, such as automotive leaf spring hole punch , standard parts and the ball of cold heading die, but also for the pressure die and drawing punch.
Chemical composition:
7Cr7Mo2V2Si, its carbon content is lower than G. Steven recommended "carbon balance" rule. On five 7Cr7Mo2V2Si mold steel, adding Cr, Mo, V elements are conducive to secondary hardening, to ensure that steel has high hardness, strength and good abrasion resistance; adding a certain amount of Si, in order to strengthen the matrix, improving temper resistance. Steel / element C (carbon) Si (silicon) Mn (manganese) P (P) S (S) Cr (chromium) Mo (molybdenum) V (V)
Treatment conditions:
LD commonly used in heat treatment of steel is 1100-1150 ° C quench. 7Cr7Mo2V2Si on five die steel, 530-570 ° C annealing, tempering hardness HRC57-63. 1100 ℃ for the needle tissue after quenching the remaining carbon martensite of retained austenite grain size 10.5. 1100 ℃ quench, 570 ° C tempering
Specifications: Φ12 ~ Φ220
Mould Steel Material:
4Cr5MoSiV1, H13, H13R, 3Cr2W8V, 5CrNiMo, 7Cr7Mo2V2Si, Cr12, Cr12MoV, CrWMn, P20, B30PH, BM48C, BPD25. 7Cr7Mo2V2Si on five die steel.