Ultrahigh-strength martensitic stainless steel and preparation method thereof

A martensitic stainless steel and ultra-high-strength technology, applied in the field of stainless steel, can solve the problems of not being widely used, the high price of stainless steel, and the increase of smelting processes, etc., and achieve the effects of reduced damage, excellent welding performance, and low cost

Active Publication Date: 2017-06-30
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to meet the ultra-low carbon composition requirements of martensitic precipitation hardening stainless steel, it is necessary to increase the smelting process and improve the smelting technology, which will greatly increase the smelting cost
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Method used

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  • Ultrahigh-strength martensitic stainless steel and preparation method thereof
  • Ultrahigh-strength martensitic stainless steel and preparation method thereof
  • Ultrahigh-strength martensitic stainless steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The chemical composition by weight percentage is, C: 0.11%, Cr: 11%, Mn: 0.6%, Si: 1.2%, Ni: 0.1%, Cu: 0.1%, P≤0.02%, S:≤0.02%, Yu Feedstock in the form of iron is smelted in a vacuum induction furnace. After the smelted casting is kept at 1100°C for 2 hours, forging begins, and the final forging temperature is 880°C. Then the obtained forging is heated to 980°C for 4 hours and then quickly taken out of the furnace for water quenching, followed by tempering at 220°C for 4 hours.

[0033] The main metallographic structure of the obtained material is lath martensite structure and nano-carbide precipitation, has excellent strength, plasticity and toughness, and has good corrosion resistance and weldability. The yield strength is 1310MPa, the tensile strength is 1610MPa, the elongation is 16%, and the impact toughness at room temperature is 61J / cm 2 .

Embodiment 2

[0035] The chemical composition by weight percentage is, C: 0.24%, Cr: 12%, Mn: 2.0%, Si: 2.5%, Ni: 3.8%, Cu: 0.3%, P≤0.02%, S:≤0.02%, The raw material with the balance being iron is smelted in a vacuum induction furnace. After the smelted casting is kept at 1150°C for 2 hours, forging begins, and the final forging temperature is 890°C. Then the obtained forgings are heated to 1000°C for 4 hours and then quickly taken out of the furnace for water quenching, followed by tempering at 250°C for 4 hours.

[0036] The main metallographic structure of the obtained material is lath martensite structure and nano-carbide precipitation, has excellent strength, plasticity and toughness, and has good corrosion resistance and weldability. The yield strength is 1320MPa, the tensile strength is 1620MPa, the elongation is 16%, and the impact toughness at room temperature is 65J / cm 2 .

Embodiment 3

[0038] For the chemical composition by weight percentage, C: 0.25%, Cr: 16%, Mn: 1.1%, Si: 1.1%, Ni: 1%, Cu: 0.2%, P≤0.02%, S:≤0.02%, The raw material with the balance being iron is smelted in a vacuum induction furnace. After the smelted casting is held at 1180°C for 2 hours, forging begins, and the final forging temperature is 900°C. Then the obtained forging is heated to 1050°C for 4 hours and then quickly taken out of the furnace for water quenching, followed by tempering at 240°C for 4 hours.

[0039] The main metallographic structure of the obtained material is lath martensite structure and nano-carbide precipitation, has excellent strength, plasticity and toughness, and has good corrosion resistance and weldability. The yield strength is 1330MPa, the tensile strength is 1650MPa, the elongation is 16%, and the room temperature impact toughness is 64J / cm 2 .

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Abstract

The invention discloses ultrahigh-strength martensitic stainless steel and a preparation method thereof. The ultrahigh-strength martensitic stainless steel is high in yield strength, high in tensile strength, good in ductility and good in impact toughness. The preparation method comprises the steps as follows: Step 1, a raw material is prepared from stainless steel components in percentage by weight according to the burnt value, is smelted in the vacuum environment and is poured to form a steel ingot; the steel ingot is prepared from components in percentage by weight as follows: 0.10%-0.25% of C, 11.0%-17.0% of Cr, 0.5%-2.0% of Mn, 1.1%-3.0% of Si, 0.1%-4.0% of Ni, 0.1%-0.3% of Cu, less than or equal to 0.02% of P, less than or equal to 0.02% of S and the balance of Fe and inevitable impurity elements; Step 2, forging of the steel ingot is started at 1,050-1,200 DEG C, the finish forging temperature ranges from 880 DEG C to 920 DEG C, the forging ratio is larger than or equal to 5, and air cooling is performed after forging; Step 3, a forging is subjected to heat preservation at 950-1,050 DEG C for 2-4 h, is subjected to water quenching and then is tempered at 200-300 DEG C for 2-4 h, and the ultrahigh-strength martensitic stainless steel is obtained after natural cooling.

Description

technical field [0001] The invention relates to the field of stainless steel, in particular to an ultra-high-strength martensitic stainless steel and a preparation method thereof. Background technique [0002] With the rapid development of marine development, petrochemical industry, and aviation and aerospace industries, the demand for high-strength stainless steel with high strength, high toughness, high corrosion resistance, and good comprehensive properties such as welding has increased. Stainless steel is divided into five categories according to metallographic structure, namely austenitic stainless steel, duplex stainless steel, ferritic stainless steel, martensitic stainless steel and precipitation hardening stainless steel. Among them, martensitic precipitation hardening stainless steel has the highest strength level among stainless steels, so it has become a hot spot in research and development. Martensitic precipitation hardening stainless steel is a new type of st...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/04C22C38/02C22C38/34C22C38/42C21D1/18C21D6/00
CPCC21D1/18C21D6/004C21D6/005C21D6/008C22C38/002C22C38/02C22C38/04C22C38/34C22C38/42C22C38/58C21D2211/008C21D2211/001C21D2211/004
Inventor 柳永宁江涛孙俊杰王英俊孙钰
Owner XI AN JIAOTONG UNIV
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