Hard alloy ultra-low temp. treatment process
A technology of ultra-low temperature treatment and hard alloy, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problem of affecting the service life of bimetal saw bands, the failure of the teeth and the base material are not synchronized, and the teeth and the base material cannot be separated and other issues, to achieve significant economic and social benefits, improve labor productivity, and reduce residual stress
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example 1
[0028] Material:
[0029] Tooth part: high-cobalt high-speed steel Substrate: 35 chromium molybdenum nickel alum
[0030] Process:
[0031] 1. Quenching process:
[0032] Temperature: 1185°C
[0033] 2. Tempering process:
[0034] Temperature: 520℃ Time: 2h*3 times
[0035] 3. Cryogenic treatment process:
[0036] Cool to -120°C at a rate of 40°C / min, keep warm for 6h and then warm up to room temperature at the same rate.
[0037] 4. Tempering process:
[0038] Temperature: less than 500°C Time: 2h*1 time
example 2
[0040] Material:
[0041] Tooth part: high-cobalt high-speed steel Substrate: 35 chromium molybdenum nickel alum
[0042] Process:
[0043] 1. Quenching process:
[0044] Temperature: 1185°C
[0045] 2. Tempering process:
[0046] a: Temperature: 520°C
[0047] Time: 2h*2 times
[0048] b: Temperature: 550°C
[0049] Time: 2h*1 time
[0050] 3. Cryogenic treatment process:
[0051] Cool to -150°C at a rate of 50°C / min, keep warm for 60h and then warm up to room temperature at the same rate.
[0052] 4. Tempering process:
[0053] Temperature: less than 500°C Time: 1h*1 time
example 3
[0055] Material:
[0056] Tooth part: high-cobalt high-speed steel Substrate: 35 chromium molybdenum nickel alum
[0057] Process:
[0058] 1. Quenching process:
[0059] Temperature: 1185°C
[0060] 2. Tempering process:
[0061] Temperature: 530℃ Time: 2h*3 times
[0062] 3. Cryogenic treatment process:
[0063] Cool to -190°C at a rate of 60°C / min, keep warm for 50h and then warm up to room temperature at the same rate.
[0064] 4. Tempering process:
[0065] Temperature: less than 500°C Time: 2h*1 time
[0066] The bimetallic saw band treated by the above process is subjected to a rapid cutting test and a rapid fatigue test on GCr15 steel with a diameter of 65cm in the quenched and tempered state. Example 1, 2, and 3 correspond to test strips A, B, and C respectively, and the statistical results are the average value of 20 strips. The material to be cut is: GCr15 steel, diameter: 65cm, heat treatment process: quenching and tempering, hardness: HRC36~38)
[0067] ...
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