High-speed tool steel
Fast-cutting steel is produced in accordance with the norms of GOST 19265−73. Used in the production of metal cutting tools, which is designed for high-speed cutting. Doped with tungsten, molybdenum, vanadium, cobalt, which provides high heat resistance, redness, hardness.
The number indicated after the letter «P» means the average content of tungsten (from the total mass in percent, the letter B is skipped). Then the letters M, K, and F indicate the percentage of molybdenum, cobalt, vanadium.
|Chemical composition of the material in percent|
|P18||Up to 0.5||Up to 0.5||0.73 — 0.83||Up to 0.4||3.8 — 4.4||To 0.03||To 0.03||Up to 1||Up to 0.5||1−1.4||17 — 18.5|
|P6M5||Up to 0.5||Up to 0.5||0.82 — 0.9||Up to 0.4||3.8 — 4.4||To 0.03||To 0.025||4.8 — 5.3||Up to 0.5||1.7 — 2.1||5.5 — 6.5|
|P9K5||Up to 0.5||Up to 0.5||0.9 — 1||Up to 0.4||3.8 — 4.4||To 0.03||To 0.03||Up to 1||5.0−6.0||2.3 — 2.7||9.0−10.0|
|P6M5K5||Up to 0.5||Up to 0.5||0.84 — 0.92||Up to 0.4||3.8 — 4.3||To 0.03||To 0.03||4.8 — 5.3||4.7 — 5.2||1.7 — 2.1||5.7 — 6.7|
|Hardness after annealing of P18 material||HB 10 -1 = 255 MPa|
|Hardness after annealing of P9K5 material||HB 10 -1 = 269 MPa|
|Hardness after annealing of P6M5 material||HB 10 -1 = 255 MPa|
|Hardness after annealing of P6M5K5 material||HB 10−1 = 269 MPa|
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