Nitrogen-controlled martensitic stainless steel and manufacturing method thereof
A martensitic stainless steel and manufacturing method technology, applied in the field of martensitic stainless steel, can solve the problems of carbon segregation, steel plate performance uniformity and corrosion resistance, high strength, etc., and achieve the effect of high hardness and high toughness
Inactive Publication Date: 2015-06-17
BAOSTEEL STAINLESS STEEL
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Problems solved by technology
[0003] Chinese patent CN103255340 discloses a high-strength and toughness hot-formed steel plate and its preparation method, which uses the method of quenching + composition design to achieve a multi-phase structure, which overcomes the problems of high strength and insufficient toughness of high-strength automotive steel after forming, but it is still a problem Carbon is the main strengthening alloying element, combined with process optimization to achieve the best strength and toughness; the disadvantage of this patent is that higher carbon is easy to cause carbon segregation in the finished product, which affects the performance uniformity and corrosion resistance of the steel plate have a greater impact
However, in Chinese patents CN103243275 and CN103045950, the Charpy impact energy at 20°C is only ≤25J, and the toughness is insufficient
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[0032] The present invention will be further described below in conjunction with the embodiments and accompanying drawings.
[0033] Table 1 shows the weight percentages of the chemical components of the wear-resistant steel plates of the following examples 1-5 and the steel plates of comparative examples 1 and 2. The manufacturing methods of the wear-resistant steel plates of Examples 1-5 and the steel plates of Comparative Examples 1 and 2 are as follows: smelting and casting according to the composition in Table 1, and hot-rolling to make hot-rolled steel plates or steel strips. The hot-rolling temperature is 1150-1250 ° C. Annealing: heat the annealed steel plate or strip to 850-1000°C, keep it warm for 5-30 minutes, and then rapidly cool (air-cooled) at a speed of ≥30°C / s to the two-phase region of martensite and austenite; then Heat to 350-500°C, keep warm for 10-30 minutes, and air-cool to room temperature. The specific process parameters of Examples 1-5 and Comparativ...
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Abstract
The invention relates to a nitrogen-controlled martensitic stainless steel and a manufacturing method thereof. The nitrogen-controlled martensitic stainless steel is composed of the following components in percentage by weight: 0.05-0.35% of C, 0.01-1.0% of Si, 0.01-2.5% of Mn, at most 0.04% of P, at most 0.01% of S, 11.0-15.0% of Cr, 0.05-0.15% of N, 0.05-0.25% of V, 0.01-1.5% of Mo, 0-0.1% of Nb, 0-0.1% of Ti, and the balance of Fe and inevitable impurities. All the elements simultaneously satisfy the following relationships: 0.1%<=C+N<=0.4%, and 0.05%<=V+Ti+Nb<=0.25%. The hardness of the steel is 30-50 HRC, the 20-DEG C Charpy V-notch longitudinal impact work is greater than 30J, and the steel has favorable compatibility between high hardness and high toughness.
Description
technical field [0001] The invention belongs to the field of martensitic stainless steel, and in particular relates to a nitrogen-controlling martensitic stainless steel and a manufacturing method thereof. Background technique [0002] Martensitic stainless steel is a chromium-based stainless steel, which is widely used in fields that require strength, toughness and corrosion resistance, such as knives, scissors, measuring tools, and turbine blades. Among them, the medium and low carbon martensitic stainless steel is required to have high hardness (30-40HRC) and good toughness (Charpy V-notch impact energy > 30J). Martensitic steel mainly increases the strength and hardness after heat treatment by adding carbon, but the increase in carbon content will reduce the toughness. Therefore, high strength and high toughness are always a pair of performance contradictions of martensitic steel. [0003] Chinese patent CN103255340 discloses a high-strength and toughness hot-formed...
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IPC IPC(8): C22C38/38C22C38/28C21D8/02
Inventor 张鑫余海峰江来珠张伟陈龙夫郑皓宇
Owner BAOSTEEL STAINLESS STEEL