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.

Active Publication Date: 2018-03-27
有研金属复材技术有限公司
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing 0Cr17Ni4Cu4Nb stainless steel rods, which solves the problems that the material strength is difficult to be further improved in the traditional process and the corrosion resistance is reduced due to material strengthening only by heat treatment.

Method used

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Embodiment 1

[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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Abstract

The invention belongs to the technical field of stainless steel rod member preparation methods and relates to a preparation method of a 0Cr17Ni4Cu4Nb precipitation-hardening stainless steel bar. The preparation method comprises 1, vacuum melting ingot casting, 2, hot forging cogging for rod blank preparation, 3, high temperature static liquid extruding deformation heat treatment for material structure improvement, 4, cold hydrostatic extrusion near-net formation surface modification and 5, vacuum or gas protection aging heat treatment reinforcement. The 0Cr17Ni4Cu4Nb precipitation-hardening stainless steel bar has high strength, high toughness, high corrosion resistance and high wear resistance and can be used for making a high load shaft rod part and especially for making a high pressure valve core used in a processing corrosion atmosphere and other small bearing valve bar parts.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of stainless steel rods, and in particular relates to a preparation method of 0Cr17Ni4Cu4Nb precipitation-hardened stainless steel rods. Background technique [0002] 0Cr17Ni4Cu4Nb is a martensitic precipitation-hardening stainless steel. Because of its low C content and high nickel and chromium content, it has good corrosion resistance, and its corrosion resistance is almost the same as that of 304 and 430. And because it contains more copper and niobium elements, it can be precipitated during heat treatment and strengthen the grain structure, so it has high strength and hardness, so it is widely used in petroleum, chemical, and nuclear power valves. Many valves used in high-pressure corrosive environments are used as key components such as slender valve stems, fixed shafts, and sealed valve cores. Because 0Cr17Ni4Cu4Nb has high strength and poor plasticity, in the conventional proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/06C22C38/48
Inventor 胡捷
Owner 有研金属复材技术有限公司
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