The advantages and applications of stainless steel bearings
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The determination of vacuum heat treatment process parameters
by：Waxing
2020-10-01
1, vacuum degree, should be paid attention to when considering the vacuum degree of work: (
1)
Before 900 ℃, the first 0.
More than 1 pa high vacuum, degassing.
(
2)
10 -
1 pa heated, equivalent to more than 1 PPM inert gas purity, general won't oxide black metal.
(
3)
The inert gas, such as 133 pa, (
50％N2+50％H2）
Hydrogen nitrogen mixture gas, its effect than 10 -
2 ~ 10 -
3 pa vacuum.
The oxygen partial pressure of 66.
5 pa is safe.
(
4)
The vacuum degree and is corresponding to the steel surface brightness.
(
5)
General 10 -
3 ~ 133 pa vacuum, vacuum temperature difference of + / - 5 ℃, such as pressure rise, temperature uniformity, so the air pressure should be could be as low as far as possible.
2, heating and preheating temperature: 3, vacuum quenching heating time
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