Material Name: high-speed tool steel bar
Grade: W18Cr4VCo5
Standard: GB/T9943-1988
Features and application:
For the tungsten system normally contains high-speed steel drill, red hardness than W18Cr4v slightly higher hardness and high temperature, but the toughness is low, after quenching, the surface hardness of up to 63 ~ 66HRC. For high-speed cutting tools, automated machine tools for cutting higher strength of materials used.
Chemical Composition%:
C: 0.70 ~ 0.80 (tolerance of plus or minus 0.01)
SI: 0.20 ~ 0.40 (tolerance of plus or minus 0.05)
MN: 0.10 ~ 0.40 (tolerance of plus or minus 0.04)
S: greater than or equal to 0.030
P: greater than or equal to 0.030
CR: 3.75 ~ 4.50 (tolerance of plus or minus 0.05)
NI: allow the residual content of greater than or equal to 0.30
CU: allow the residual content of greater than or equal to 0.25
V: 0.80 ~ 1.20 (tolerance: plus or minus 0.05)
MO: 0.40 ~ 1.00 (tolerance: size greater than or equal to 6, plus or minus 0.05; size of less than 10, plus or minus 0.10)
W: 17.50 ~ 19.00 (tolerance: size greater than or equal to 10, plus or minus 0.10, smaller than 10, plus or minus 0.20)
CO: 4.25 ~ 5.75 (tolerance of plus or minus 0.15)
Mechanical properties:
Hardness:
Delivery condition: (other processing methods) is greater than or equal to 285HB; (annealing) is greater than or equal to 269HB. Sample quenching and tempering heat treatment system and the hardness of less than or equal to 63HRC
Heat treatment and microstructure specifications:
Heat treatment and quenching 820 ~ 870 degree preheated intake's, 1270 ~ 1290 ° C (salt bath), or 1280 to 1300 degrees Celsius (box-type furnace) heating, oil heat, 540 ~ 560 ° C tempering two times, each time 2h.
Delivery status:
Hot rolling, forging, annealing cold-drawn steel bar to the state of delivery, hot-rolled, forged steel bar to annealing + other processing methods (peeling, light pull, grinding or polishing, etc.) after the delivery process