A kind of preparation method of 0cr17ni4cu4nb precipitation hardening stainless steel bar
A stainless steel rod and precipitation hardening technology, which is applied in the field of preparation of 0Cr17Ni4Cu4Nb precipitation hardening stainless steel rods, can solve the problems of further improvement of material strength and reduced corrosion resistance, and achieve the effect of enhancing aging effect, improving plasticity and high surface hardness.
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[0025] The method of the present invention is used to prepare a sealing valve core for high-pressure valves. The diameter of the valve core is 15mm, the required strength is not less than 1500Mpa, the surface hardness HRc is not less than 47, and the grain size is not less than 7 grades. The implementation process of preparing 0Cr17Ni4Cu4Nb stainless steel rods is as follows:
[0026] 1. 50 kg of vacuum intermediate frequency furnace melting ingot, with the following proportions of alloy: Ni: 3wt% ~ 5wt%, Cr: 15.5wt% ~ 17.5wt%, Cu: 3wt% ~ 5wt% , Nb: 2.5wt% ~ 4.5wt%, the rest is Fe; after uniform mixing, the ingot is obtained by vacuum melting; the mass fraction of C in the obtained ingot is not more than 0.025%, the mass fraction of S is not more than 0.02%, and the mass fraction of P The mass fraction is not more than 0.02%;
[0027] 2. Hot forging billets to obtain billets: the forging ratio is 5, the final forging temperature is not less than 900°C, and the billet diameter...
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