Pitting-resistant multi-component precipitation-hardening stainless steel and heat treatment process thereof

A technology of precipitation hardening and stainless steel, which is applied in the field of iron and steel materials, can solve the problems of urgent improvement, unclear strengthening mechanism of alloying elements, complex composition, etc., and achieve the effect of improving age hardening performance, realizing solid solution and uniform distribution, and optimizing performance

Active Publication Date: 2021-06-01
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of alloying elements in this steel is relatively high, and the composition is complex. The strengthening mechanism of alloying elements for the aging precipitation of the second phase is not clear. Its performance optimization is especially resistant to seawater (Cl - ) Corrosion and anti-pitting corrosion performance still needs to be improved urgently, and the heat treatment system such as high temperature solid solution suitable for this steel type has yet to be perfected and clarified
It can be seen that the heat treatment technology for the multi-component precipitation hardening stainless steel composition with high strength and excellent pitting resistance and its performance optimization still needs to be improved urgently.

Method used

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  • Pitting-resistant multi-component precipitation-hardening stainless steel and heat treatment process thereof
  • Pitting-resistant multi-component precipitation-hardening stainless steel and heat treatment process thereof
  • Pitting-resistant multi-component precipitation-hardening stainless steel and heat treatment process thereof

Examples

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Effect test

Embodiment 1

[0025] A heat treatment process for pitting-resistant precipitation-hardening stainless steel, the molar percentage of the composition of the precipitation-hardening stainless steel is Fe 60 Cr 18 Cu 3 (MnCoNiMoAlTi) 19 , its mass percentage content is: Cr: 16.83%, Mn: 3.12%, Cu: 3.43%, Co: 3.35%, Ni: 3.33%, Mo: 5.45%, Al: 1.53%, Ti: 2.72%, and the balance is Fe and unavoidable impurity elements. The purity of the alloying elements used to prepare this composition is ≥99%, and the oxide skin on the surface of the raw metal is removed by mechanical grinding, and then weighed according to the mass percentage of the composition designed in this example, using an electronic balance with an induction capacity of 0.1mg Get the raw material, the total weight of the raw material is about 30g. Subsequently, put the configured raw materials in the copper crucible of the WK non-consumable vacuum electric arc furnace developed by Shenyang Vacuum Technology Research Institute, and evac...

Embodiment 2

[0032] A heat treatment process for pitting-resistant precipitation-hardening stainless steel. This embodiment provides optimized precipitation-hardening stainless steel components. On the basis of the components in Example 1, No. 2 and No. 3 reduce Mn and Cu elements and increase Al and Ti elements. Keep the content of other alloying elements constant. In order to compare the joint precipitation strengthening effect of Al and Ti, the No. 4 and No. 5 components with Ti element or Al element alone were designed for comparison. Further reduce the content of expensive metals Co, Ni, and Mo elements, increase the content of Al, Ti elements to design the No. 6 component, and on this basis, remove the Mn element to adjust the Al, Ti element content to design the No. 7 component. The purity of the selected alloy element raw materials is ≥99%, and the melting preparation method is as described in Example 1.

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Abstract

The invention provides pitting-resistant multi-component precipitation-hardening stainless steel and a heat treatment method. The Cl <-> pitting resistance and the aging hardness of the pitting-resistant multi-component precipitation-hardening stainless steel are remarkably superior to those of commercial 17-4PH precipitation-hardening stainless steel prepared under the same condition. The pitting corrosion resistance mechanism comes from Cr < 3 + > and is compounded with other alloy element ions such as Mo < 4 + >, Mo < 6 + >, Al < 3 + >, Ti < 4 + > and Co < 3 + > to form a complex surface passivation film serving as a barrier. The age hardening mechanism is derived from Al and Ti-rich nano second phases dispersed and distributed on a ferrite matrix, therefore, the precipitation-hardening stainless steel comprises the following necessary alloy elements of, in percentage by mass: 16.5%-20% of Cr, 3.0%-6.0% of Mo, 1.5%-5.5% of Al, 2.5%-6.5% of Ti, 2.0%-3.5% of Ni and 2.0%-3.5% of Co, the balance Fe and inevitable impurity elements, and 2.0%-3.5% of Mn and 2.0%-3.5% of Cu can be selectively added. According to the optimized heat treatment process, water cooling is carried out after high-temperature solution treatment is carried out in a narrow temperature interval of 1120 DEG C-1180 DEG C, and the aging temperature is 490 DEG C-550 DEG C.

Description

technical field [0001] The invention belongs to the field of iron and steel materials, and in particular relates to a multi-component precipitation hardening stainless steel with high pitting corrosion resistance and a heat treatment process thereof. Background technique [0002] Commonly used stainless steel mainly includes austenitic stainless steel, ferritic stainless steel, duplex stainless steel and precipitation hardening stainless steel. Among them, precipitation hardening stainless steel has excellent comprehensive strength and toughness and corrosion resistance comparable to austenitic stainless steel through nano-precipitation hardening, and has attracted widespread attention in the field of ultra-high-strength corrosion-resistant materials. Typical components mainly include 17-4PH (0Cr17Ni4Cu4Nb) and so on. . However, the resistance of stainless steel to Cl in seawater corrosive environment has been reported - The pitting performance is unsatisfactory. This is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/06C22C38/50C22C38/52C22C38/58C22C38/42C21D6/02
CPCC22C38/44C22C38/06C22C38/50C22C38/52C22C38/58C22C38/42C21D6/004C21D6/005C21D6/007C21D6/02
Inventor 张晖许本琪朱佳浩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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