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High-strength, high-toughness and high-plasticity martensitic stainless steel and preparation method thereof

A martensitic stainless steel, high-strength and toughness technology, applied in the field of metallurgy to achieve the effect of improving the level of strength, toughness and plasticity

Active Publication Date: 2014-03-05
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the above technical problems of the existing martensitic stainless steel, the present invention provides a high-strength toughness and high-strength plastic martensitic stainless steel and its preparation method, adding Ni, Si, Al, etc. to the traditional martensitic stainless steel alone or in combination Alloying elements, and selectively add microalloying elements such as Mo, N, Nb, V, Ti, etc., and introduce a certain volume fraction of dispersed and stable retained austenite into the martensitic structure through heat treatment process control, and prepare high-strength Martensitic stainless steel with high toughness and high strength plasticity

Method used

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  • High-strength, high-toughness and high-plasticity martensitic stainless steel and preparation method thereof
  • High-strength, high-toughness and high-plasticity martensitic stainless steel and preparation method thereof
  • High-strength, high-toughness and high-plasticity martensitic stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Melt molten steel in a protective atmosphere according to the set composition, and the protective atmosphere is nitrogen; then it is solidified by a mold to make a billet; its composition contains C 0.15%, Si 0.2%, Mn 0.4%, S 0.012%, P 0.016% by weight , Cr 13.0%, Ni 5.0%, Mo 2.0%, Nb 0.2%, V 0.3%, N 0.12%, the balance is Fe and unavoidable impurities;

[0026] The slab is hot-rolled into a hot-rolled slab with a thickness of 15mm, the starting rolling temperature is 1150±50°C, the final rolling temperature is 850±50°C, and the total reduction is 80%;

[0027] Heat the hot-rolled slab to 950°C for 2 hours, then air-cool to 150°C, heat to 450°C for 10 minutes, and air-cool to room temperature to obtain high-strength, toughness, and high-strength plastic martensitic stainless steel, with a yield strength of 873 MPa and a tensile strength of 1445MPa, elongation 22.0%, Charpy V-notch impact energy at 70J, the structure is martensite and austenite, and the volume fraction of...

Embodiment 2

[0029] Molten steel is smelted under a protective atmosphere according to the set composition, and the protective atmosphere is argon; then it is solidified by a casting mold to make a billet; its composition contains C 0.28%, Si 2.5%, Mn 3.0%, S 0.008%, P 0.019 by weight percentage %, Cr 13.0%, Al 0.8%, Mo 1.0%, Nb 0.2%, Ti 0.05%, the balance is Fe and unavoidable impurities;

[0030] The slab is hot-rolled into a hot-rolled slab with a thickness of 20mm, the starting rolling temperature is 1150±50°C, the final rolling temperature is 850±50°C, and the total reduction is 80%;

[0031] Heat the hot-rolled slab to 1050°C for 2 hours, then air-cool to 25°C, then heat to 500°C and hold for 60 minutes, then air-cool to room temperature to obtain high-strength, toughness, and high-strength plastic martensitic stainless steel with a yield strength of 650MPa and a tensile strength of 1695MPa , the elongation rate is 25.0%, the Charpy V-notch impact energy is 56J, the structure is mart...

Embodiment 3

[0033] Molten steel is smelted under a protective atmosphere according to the set composition, and the protective atmosphere is argon; then it is made into a billet through a continuous casting machine; its composition contains C 0.4%, Si 0.6%, Mn 0.4%, S 0.015%, P 0.013 by weight percentage %, Cr 17.0%, Mo 1.0%, V 0.3%, Ni 2.8%, the balance is Fe and unavoidable impurities;

[0034] The slab is hot-rolled into a hot-rolled slab with a thickness of 25mm, the starting rolling temperature is 1150±50°C, the final rolling temperature is 850±50°C, and the total reduction is 70%;

[0035] Since the total weight content of C and N in the slab is ≥0.3%, annealing treatment is carried out after hot rolling. During annealing treatment, it is heated to 900°C for 2 hours, then cooled to 500°C with the furnace, and then air-cooled to room temperature;

[0036]Heat the annealed hot-rolled slab to 1050°C for 0.5 hours, then cool it to 100°C with industrial quenching oil, heat it to 350°C for...

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Abstract

The invention discloses high-strength, high-toughness and high-plasticity martensitic stainless steel, and belongs to the technical field of metallurgy. The martensitic stainless steel comprises the following components in percentage by weight: 0.15 to 0.4 percent of C, 0 to 0.12 percent of N, 0.2 to 2.5 percent of Si, 0.4 to 3.0 percent of Mn, less than or equal to 0.02 percent of S, less than or equal to 0.02 percent of P, 13.0 to 17.0 percent of Cr, 0 to 5.0 percent of Ni, 0 to 2.0 percent of Mo, 0 to 0.3 percent of V, 0 to 0.2 percent of Nb, 0 to 0.05 percent of Ti, 0 to 0.8 percent of Al and the balance of Fe and inevitable impurities. A preparation method comprises the following steps of (1) smelting molten steel according to the set components, and solidifying the molten steel to form an ingot blank by using a continuous casting machine or a casting mold; (2) hot-rolling the ingot blank to form a hot-rolled plate blank; (3) heating the hot-rolled plate blank to 950 to 1100 DEG C, preserving heat for 0.5 to 2 hours, cooling the plate blank to 25 to 200 DEG C, heating the plate blank to 350 to 500 DEG C, preserving heat for 10 to 60 minutes, and air-cooling the plate blank to room temperature. According to the martensitic stainless steel prepared by the method, dispersed remaining martensite is introduced into a microscopic structure, so that the strength, toughness and plasticity of the martensitic stainless steel are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength toughness and high-strength plasticity martensitic stainless steel and a preparation method thereof. Background technique [0002] As the preferred steel grade under high-load corrosion environment, martensitic stainless steel is widely used in knives, steam turbine blades, bearings, valves, structural parts and wear-resistant parts. Martensitic stainless steel is usually quenched-tempered to obtain (tempered) martensite + carbide microstructure; although its strength and toughness can be controlled by changing the tempering temperature and time, due to the trade-off between strength and plasticity , coupled with microstructure uniformity and temper brittleness, the plasticity and toughness of martensitic stainless steel are always lower than low-alloy steels of the same strength level; further improving the combination of strength and toughness is ...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/34C22C38/22C22C38/24C22C38/26C22C38/28C22C38/40C22C38/44C22C38/46C22C38/48C22C38/50C22C38/58C21D8/02
Inventor 王立军刘春明
Owner NORTHEASTERN UNIV
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