Low-alloy martensite steel high-toughness treatment method and martensite steel

A technology of martensitic steel and processing method, which is applied in the direction of metal processing equipment, etc., can solve problems such as poor forging effect, and achieve the effects of avoiding too low final forging temperature, refining austenite grains, and low production cost

Active Publication Date: 2020-07-28
广东泰邦耐磨金属科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a method for strengthening and toughening low-alloy martensitic steel and martensitic steel, which solves the problem that the existing forging effect is not good , can significantly refine the original austenite grains, and can significantly improve the ductility and toughness while increasing the strength of martensitic steel

Method used

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  • Low-alloy martensite steel high-toughness treatment method and martensite steel
  • Low-alloy martensite steel high-toughness treatment method and martensite steel

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Embodiment 1

[0035] A method for strengthening and toughening low-alloy martensitic steel. The smelted steel ingot is about 15Kg, which contains the following components in mass percentages: 0.27%C, 1.2%Cr, 1.1%Mn, 1.3%Si, 0.5%Mo, and the rest is Fe , the A3 temperature (austenite transformation temperature) of the alloy is about 830°C, and the A1 temperature (eutectoid transformation temperature) is about 750°C. The strengthening and toughening treatment method includes:

[0036] (S1) Pretreatment: heating the steel ingot with the above composition to 1150°C in an inert atmosphere (such as nitrogen) protection furnace, and holding it for 30 minutes for high-temperature homogenization treatment to obtain a uniform single-phase austenite structure;

[0037] (S2) High-temperature forging: take the steel ingot out of the atmosphere protection furnace, and immediately perform high-temperature forging. The forging ratio is about 70%. The final forging temperature is 70°C higher than the A3 tempe...

Embodiment 2

[0044] A low-alloy martensitic steel strengthening and toughening treatment process, the smelted steel ingot is about 10Kg, which contains the following components in mass percentages: 0.4%C, 2.0%Cr, 1.5%Mn, 1.5%Si, 0.5%Mo, and the rest is Fe , the A3 temperature of the alloy is about 810°C, and the A1 temperature is about 745°C. The strengthening and toughening treatment method includes:

[0045] (S1) Pretreatment: heating the steel ingot with the above composition to 1200°C in an inert atmosphere protection furnace, holding it for 45 minutes for high-temperature homogenization treatment, to obtain a uniform single-phase austenite structure;

[0046] (S2) High-temperature forging: take the steel ingot out of the atmosphere protection furnace, and immediately perform high-temperature forging. The forging ratio is about 80%. The final forging temperature is 50°C higher than the A3 temperature, specifically 860°C. Immediately after the final forging, it is immersed in about 60°C....

Embodiment 3

[0051] A low-alloy martensitic steel strengthening and toughening treatment process, the smelted steel ingot is about 12Kg, which contains the following components in mass percentages: 0.3%C, 2.2%Cr, 0.8%Mn, 1.2%Si, 0.5%Mo, 0.3%Ni , and the rest is Fe. The A3 temperature of the alloy is about 820°C, and the A1 temperature is about 750°C. The strengthening and toughening treatment method includes:

[0052] (S1) Pretreatment: heating the steel ingot with the above composition to 1250°C in an inert atmosphere protection furnace, holding it for 30 minutes for high-temperature homogenization treatment, to obtain a uniform single-phase austenite structure;

[0053] (S2) High-temperature forging: take the steel ingot out of the atmosphere protection furnace, and immediately carry out high-temperature forging, the forging ratio is about 70%, and the final forging temperature is 100°C higher than the A3 temperature, specifically 920°C. Immediately after final forging, immerse in quench...

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Abstract

The invention discloses a low-alloy martensite steel high-toughness treatment method and martensite steel. The low-alloy martensite steel high-toughness treatment method comprises the following steps:(1) pretreatment, wherein a uniform single-phase austenite structure is obtained; (S2) high-temperature forging, wherein a forging ratio is 50-80%, a final forging temperature is higher than a martensite transformation temperature by 50-100 DEG C, and the austenite structure is cooled to the room temperature to obtain a structure taking martensite as the principal thing; (S3) medium-temperature forging, wherein heat is preserved at a temperature higher than the martensite transformation temperature by 30-70 DEG C, air cooling is performed, forging begins while the temperature is cooled to a temperature lower than an eutectoid transformation temperature by 30-100 DEG C, the forging ratio is 70-90%, the final forging temperature is lower than the eutectoid transformation temperature by 150-250 DEG C, forging total time is within 2 minutes, quenching cooling is performed until the room temperature, and the structure taking the uniform fine batten as the principal thing is obtained; and (S4), low-temperature tempering. According to the method disclosed by the invention, high-temperature forging and medium-temperature forging are combined, so that original austenite grains can be remarkably refined, and therefore, plasticity and toughness are remarkably improved while strength of the martensite steel is increased.

Description

technical field [0001] The invention relates to a treatment method for low-alloy martensitic steel, in particular to a treatment method for strengthening and toughening low-alloy martensitic steel and the martensitic steel. Background technique [0002] Low-alloy martensitic steel has low production cost, simple process, and good welding performance, and is widely used in the fields of large-scale components such as automobile industry, machinery, and mining. With the development trend of environmental protection, energy saving and emission reduction, and automobile lightweight, higher requirements are put forward for the strength, plasticity and toughness of steel. In general, the higher the strength of the steel, the lower the plasticity and toughness. The common technical problem in the production and service of martensitic steel is insufficient plasticity and toughness. [0003] For high-strength martensitic steels, it is particularly important to improve toughness whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/74C21D1/18C21D6/00C21D8/00C22C38/02C22C38/04C22C38/22C22C38/34C22C38/44C22C38/46C22C38/54B21J1/06B21J5/00
CPCC21D1/74C21D1/18C21D8/005C21D6/004C21D6/005C21D6/008C22C38/04C22C38/02C22C38/34C22C38/44C22C38/46C22C38/54C22C38/22B21J5/002B21J1/06C21D2211/008
Inventor 乔勋尹福祥李京泽刘守法孟东容党波张仪
Owner 广东泰邦耐磨金属科技有限公司
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