Martensite ageing stainless steel with high strength and high toughness

A high-strength, high-toughness, martensitic technology, applied in the field of stainless steel, can solve problems that affect the safety and reliability of components, poor corrosion resistance, insufficient toughness, etc., and achieve high promotion and application prospects, high corrosion resistance, and low cost effects

Inactive Publication Date: 2007-10-10
CENT IRON & STEEL RES INST
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Problems solved by technology

However, it does not contain Cr elements, or the Cr content is very low, and the corrosion resistance is poor. In order to improve its corrosion resistance, surface protection measures such as cadmium plating must be used. However, due to the pressure of environmental improvement, the processing cost of the plating solution has been increasing. Therefore, it is not a long-term solution to improve the corrosion resistance of metal materials through surface treatment. T

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  • Martensite ageing stainless steel with high strength and high toughness

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Embodiment Construction

[0021] The steel of the present invention and the comparative steel were smelted by vacuum induction furnace smelting and vacuum consumable remelting. The chemical composition is shown in Table 2. Table 3 is a comparison table of the mechanical properties and corrosion rates of the steel of the present invention and the comparison steel. Above-mentioned list, 1-4# is the embodiment of the present invention, and 5# contrast steel is PH13-8Mo, and 6# contrast steel is 17-4PH, and 7# contrast steel is Custom465, and 8# contrast steel is 18Ni maraging steel ( 250 grade), 9# contrast steel is 300M. The steel ingot was forged into a steel rod with a diameter of 60mm. The steel of the present invention was subjected to solution heat treatment at 925°C×1h, and then subjected to aging treatment at 510°C×4h, while the comparison steel was subjected to normal heat treatment under appropriate conditions. Smooth tensile test, U-notch impact test and fracture toughness test were carried ou...

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Abstract

This invention relates to a high-strength and high-toughness maraging stainless steel, whose chemical composition is: C less than or equal to 0.02 wt.%, Si less than or equal to 0.1 wt.%, Mn less than or equal to 0.1 wt.%, S less than or equal to 0.01 wt.%, P less than or equal to 0.01 wt.%, Cr 10.0-11.5 wt.%, Ni 11.7-12.5 wt.%, Mo 0.5-2.0 wt.%, Ti 1.2-1.7 wt.%, Al 0.02-0.5 wt.%, and Fe as balance. The strength of the maraging stainless steel is 1700-1800 MPa. The maraging stainless steel has such advantages as low cost, high strength, high fracture toughness, and high corrosion resistance.

Description

technical field [0001] The invention belongs to the field of stainless steel, in particular to a high-strength and high-toughness maraging stainless steel, the strength of which reaches 1700-1800 MPa. Background technique [0002] In the existing technology, with the development of science and technology and the progress of human civilization, the development of metal materials with corrosion resistance has become an inevitable trend and a goal pursued by science and technology. Because corrosion not only loses material, damages component surfaces, and degrades material properties. According to a report in 2006, the direct loss caused by material corrosion in the United States is 279 billion US dollars per year, which is equivalent to 3.2% of the national GDP. If the cost of surface treatment such as cadmium plating and damage to the environment are considered, the loss caused by material corrosion is even more alarming. . [0003] As we all know, the steel with strength e...

Claims

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Application Information

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IPC IPC(8): C22C38/50
Inventor 陈嘉砚杨卓越苏杰丁雅莉
Owner CENT IRON & STEEL RES INST
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