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Corrosion fatigue resistant steel for engineering and preparation method thereof

A corrosion fatigue and anti-corrosion technology, applied in the field of low-alloy steel manufacturing, can solve problems such as restricting the application and development of low-alloy structural steel, and achieve the effect of being suitable for promotion and use, inhibiting initiation and expansion, and improving corrosion fatigue life.

Pending Publication Date: 2021-06-04
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still no low-alloy structural steel design for corrosion fatigue resistance, which seriously restricts the application and development of low-alloy structural steel

Method used

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  • Corrosion fatigue resistant steel for engineering and preparation method thereof
  • Corrosion fatigue resistant steel for engineering and preparation method thereof
  • Corrosion fatigue resistant steel for engineering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A corrosion-resistant fatigue steel for engineering, its chemical composition and weight percentage are: C: 0.05%, Si: 0.24%, Mn: 1.54%, P: ≤0.01%, S: ≤0.015%, Cr: 0.47%, Cu : 0.32%, Ni: 0.81%, Sb: 0.10%, and the rest are Fe and unavoidable impurities.

[0036] The preparation method of the anti-corrosion fatigue steel is as follows: figure 1 shown, including the following steps:

[0037] Cast molten steel after smelting to form a steel ingot, heat the steel ingot to the austenitization temperature of 1190-1210°C, and keep it warm for 2 hours to make it completely austenitized;

[0038] The furnace is cooled to the starting rolling temperature of 990-1010°C and held for 2 hours, and then rolled into a 12mm steel plate after 10-12 passes, ensuring that the final rolling temperature is between 870-890°C; the rolled steel plate is sent into the water Cooling in the laminar flow area to ensure that the outlet water temperature is between 420-440°C, the cooling rate is 20-...

Embodiment 2

[0041] A corrosion-resistant fatigue steel for engineering, its chemical composition and weight percentage are: C: 0.05%, Si: 0.24%, Mn: 1.54%, P: ≤0.01%, S: ≤0.015%, Cr: 0.47%, Cu : 0.33%, Ni: 1.51%, Sb: 0.10%, and the rest are Fe and unavoidable impurities.

[0042] The preparation method of the anti-corrosion fatigue steel is as follows: figure 1 shown, including the following steps:

[0043] Cast molten steel after smelting to form a steel ingot, heat the steel ingot to the austenitization temperature of 1190-1210°C, and keep it warm for 2 hours to make it completely austenitized;

[0044] The furnace is cooled to the starting rolling temperature of 990-1010°C and held for 2 hours, and then rolled into a 12mm steel plate after 10-12 passes, ensuring that the final rolling temperature is between 870-890°C; the rolled steel plate is sent into the water Cooling in the laminar flow area to ensure that the outlet water temperature is between 420-440°C, the cooling rate is 20-25...

Embodiment 3

[0047] A corrosion-resistant fatigue steel for engineering, its chemical composition and weight percentage are: C: 0.05%, Si: 0.24%, Mn: 1.54%, P: ≤0.01%, S: ≤0.015%, Cr: 0.47%, Cu : 0.58%, Ni: 1.51%, Sb: 0.10%, and the rest are Fe and unavoidable impurities.

[0048] The preparation method of the anti-corrosion fatigue steel is as follows: figure 1 shown, including the following steps:

[0049] Cast molten steel after smelting to form a steel ingot, heat the steel ingot to the austenitization temperature of 1190-1210°C, and keep it warm for 2 hours to make it completely austenitized;

[0050] The furnace is cooled to the starting rolling temperature of 990-1010°C and held for 2 hours, and then rolled into a 12mm steel plate after 10-12 passes, ensuring that the final rolling temperature is between 870-890°C; the rolled steel plate is sent into the water Cooling in the laminar flow area to ensure that the outlet water temperature is between 420-440°C, the cooling rate is 20-...

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Abstract

The invention discloses corrosion fatigue resistant steel and a preparation method thereof, and belongs to the field of low alloy steel manufacturing. According to the steel, on the basis that E690 steel comprises the main elements of 0.04%-0.07% of C, 0.20%-0.26% of Si, 1.45%-1.60% of Mn, less than or equal to 0.01% of P, less than or equal to 0.015% of S and 0.44%-0.50% of Cr, element regulation and control are carried out, and the steel comprises the characteristic elements of 0.28%-0.66% of Cu, 0.76%-1.55% of Ni, 0.03%-0.12% of Sb and the balance Fe and inevitable impurities. According to the corrosion fatigue resistant steel for engineering and the preparation method thereof, the alloy elements Cu, Ni and Sb are adjusted and added to inhibit corrosion fatigue crack initiation and expansion while the comprehensive mechanical property requirement is ensured through alloy element regulation and control, so that the corrosion fatigue life is prolonged to meet the requirement of engineering steel on corrosion fatigue resistance design. A steel ingot meeting the component design range is smelted through a vacuum induction furnace, through laboratory corrosion fatigue performance evaluation and corresponding follow-up component design and preparation process optimization, the corrosion fatigue resistant steel with the structure being bainite is finally obtained, and the corrosion fatigue life of the corrosion fatigue resistant steel can be prolonged by 52% at most.

Description

technical field [0001] The invention belongs to the field of low-alloy steel manufacturing, and in particular relates to an engineering steel with excellent anti-corrosion fatigue performance and a preparation method thereof. Background technique [0002] For a long time, since the design and manufacture of low-alloy engineering steels in my country has been developing in the main direction of multi-variety, high-strength toughness, complex loads, easy welding, and corrosion resistance, corrosion fatigue resistance has not been regarded as one of the design standards for steel. one. [0003] Engineering steel is faced with a complex corrosive environment during its service. In addition to the working pressure brought by itself and various equipment, it is often subjected to repeated dynamic loads. Under such periodic or non-periodic alternating loads and corrosive media Engineering steel is prone to corrosion fatigue fracture failure under double coupling effect. Corrosion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/42C22C38/58C22C38/60C22C33/04C21D6/00C21D8/02
CPCC21D6/004C21D6/005C21D6/008C21D8/0205C21D8/021C21D8/0226C21D2211/002C22C33/04C22C38/02C22C38/04C22C38/42C22C38/58C22C38/60
Inventor 刘智勇徐学旭胡洋李晓刚杜翠薇
Owner UNIV OF SCI & TECH BEIJING
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