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High-cobalt martensitic stainless steel and preparation method

A technology of martensitic stainless steel and high-cobalt martensite, which is applied in the field of alloys and can solve problems such as low tensile strength and difficulty in meeting the high-strength requirements of stainless steel

Active Publication Date: 2019-04-23
王俊乔
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as Chinese patents CN102465240A, CN106086701A and CN103334063A, 0Cr15Ni7Mo2Al and 0Cr13Ni8Mo2Al in the United States all disclose stainless steel materials with martensitic structure, but the tensile strength of martensitic stainless steel in the above materials is lower than 1600MPa, and the yield strength is lower than 1500MPa, which is difficult to meet The development of modern industry requires the high strength of stainless steel

Method used

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preparation example Construction

[0045] The present invention also provides a method for preparing high-cobalt martensitic stainless steel described in the above technical solution, comprising the following steps:

[0046] (1) Mix the raw materials corresponding to each chemical composition according to the above mass content, and then carry out vacuum smelting and casting of the mixed raw materials in sequence to obtain steel ingots; the temperature of the vacuum smelting is 1580-1620°C, and the time of vacuum smelting is 30-180min ; Vacuum degree of vacuum melting ≤ 5Pa;

[0047] (2) Forging the steel ingot obtained in the step (2) to obtain a forging material; the starting forging temperature of the forging is 1180-1230°C, and the final forging temperature is 800-900°C;

[0048] (3) performing normalizing treatment and tempering treatment on the forging material obtained in the step (3) successively to obtain a machined forging material;

[0049] The temperature of the normalizing treatment is 1080-1130°C...

Embodiment 1～6

[0078] Based on 100% mass content, the chemical composition of Examples 1-6 is shown in Table 1, and the balance is Fe; the process parameters of the preparation method are shown in Table 2. Wherein, the smelting method of the embodiment is: two-stage smelting, and the time ratio of the first-stage smelting and the second-stage smelting is about 3:2.

[0079] According to GB / T228.1-2010 standard to test the room temperature tensile properties of stainless steel samples; GB / T229-2007 standard to test the room temperature impact properties of stainless steel samples; GB / T4338-2006 standard to test the high temperature tensile properties of stainless steel samples, The test results are shown in Table 3.

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Abstract

The invention belongs to the technical field of alloys, and particularly relates to high-cobalt martensitic stainless steel and a preparation method thereof. The high-cobalt martensitic stainless steel is prepared from the following chemical components in percentage by mass: 0.03 to 0.15 percent of C, 11.0 to 13.0 percent of Cr, 3.0 to 6.0 percent of Ni, 8 to 14 percent of Co, 3.0 to 5.0 percent of Mo, 0.7 to 1.5 percent of Al, 0.01 to 0.3 percent of V, 0.01 to 0.03 percent of Nb, 0.1 to 0.3 percent of Cu, and the balance Fe. According to the high-cobalt martensitic stainless steel and the preparation method thereof provided by the invention, through a compound reinforcement means, under the condition of room temperature, the tensile strength of the high-cobalt martensitic stainless steelis larger than or equal to 2000MPa, and the yield strength of the high-cobalt martensitic stainless steel is larger than or equal to 1700MPa; and under the condition of high temperature being 500 DEGC, the tensile strength of the high-cobalt martensitic stainless steel is larger than or equal to 1500MPa, and the yield strength of the high-cobalt martensitic stainless steel is larger than or equalto 1280MPa

Description

technical field [0001] The invention belongs to the technical field of alloys, in particular to a high-cobalt martensitic stainless steel and a preparation method thereof. Background technique [0002] Due to its good corrosion resistance, stainless steel has become an important material in many industries such as machinery, transportation, chemical industry, shipbuilding, medical treatment, and petroleum. With the diversification of the needs of various industries, stainless steel materials have developed rapidly, and gradually formed various types of martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, austenitic-ferritic stainless steel and precipitation hardening stainless steel, among which martensitic stainless steel Tensitic stainless steel has attracted the attention of many researchers at home and abroad because of its excellent mechanical properties. Such as Chinese patents CN102465240A, CN106086701A and CN103334063A, 0Cr15Ni7Mo2Al an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/52C22C38/44C22C38/06C22C38/48C22C38/46C22C38/42C22C33/04C21D8/00C21D1/28C21D6/04
CPCC21D1/28C21D6/004C21D6/007C21D6/04C21D8/005C21D2211/008C22C33/04C22C38/06C22C38/42C22C38/44C22C38/46C22C38/48C22C38/52
Inventor 王俊乔
Owner 王俊乔
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