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Production process of high-strength and high-toughness steel plate

A production process and high toughness technology, applied in the field of heat treatment of medium and thick plates, can solve the problems of high production cost and low low temperature impact toughness of steel plates, and achieve the effect of promoting deformation austenite transformation and good comprehensive mechanical properties.

Active Publication Date: 2016-04-20
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In summary, although the strength of the high-strength and high-toughness steel plates produced by the prior art, especially the steel plates for high-strength engineering machinery with a yield strength of 690 MPa, meets the requirements, they have the disadvantages of high production costs and low low-temperature impact toughness. Generally, alloy V is added to increase the carbon equivalent of the steel plate

Method used

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  • Production process of high-strength and high-toughness steel plate
  • Production process of high-strength and high-toughness steel plate
  • Production process of high-strength and high-toughness steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072]The slab to be rolled after smelting and continuous casting is put into a heating furnace, the reheating time is 260 minutes, and the soaking time is 40 minutes. The mass percentage of the chemical composition of the slab is: C0.10%, Si0.30%, Mn1.40%, P0.006%, S0.002%, Als0.024%, Nb0.038%, Ti0.014 %, Cr0.30%, Mo0.18%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 8 mm, the detailed process parameters are shown in Table 1, and its mechanical properties are shown in Table 2.

Embodiment 2

[0074] The slab to be rolled after smelting and continuous casting is put into a heating furnace, the reheating time is 250 minutes, and the soaking time is 30 minutes. The mass percentage of the chemical composition of the slab is: C0.11%, Si0.28%, Mn1.35%, P0.010%, S0.001%, Als0.027%, Nb0.040%, Ti0.012 %, Cr0.28%, Mo0.20%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 11 mm, the detailed process parameters are shown in Table 1, and its mechanical properties are shown in Table 2.

Embodiment 3

[0076] The slab to be rolled after smelting and continuous casting is put into a heating furnace, the reheating time is 300 minutes, and the soaking time is 45 minutes. The mass percentage of the chemical composition of the slab is: C0.12%, Si0.24%, Mn1.30%, P0.008%, S0.003%, Als0.030%, Nb0.033%, Ti0.015 %, Cr0.25%, Mo0.17%, the balance is Fe and unavoidable impurities. Rolled into a steel plate with a thickness of 12 mm, the detailed process parameters are shown in Table 1, and its mechanical properties are shown in Table 2. Such as Figure 1~3 Shown are the metallographic photographs of the rolled state, the quenched state, and the tempered state of Example 3 of the present invention, respectively. From the above photos, it can be seen that the rolled steel plate is mainly low-carbon bainite structure with fine and uniform grains; the quenched steel plate is mainly lath-like martensite structure, which lays the foundation for the steel plate to obtain good performance afte...

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Abstract

The invention discloses a high-strength high-toughness steel plate. A material for producing the high-strength high-toughness steel plate comprises the following the chemical components in percentage by mass: 0.10-0.15% of C, 0.15-0.30% of Si, 1.10-1.40% of Mn, less than or equal to 0.010 of P, less than or equal to 0.003% of S, 0.020-0.030% of Als, 0.025-0.040% of Nb, 0.010-0.015% of Ti, 0.15-0.30% of C, 0.15-0.20% of Mo and the rest of Fe and other impurities. The invention aslo discloses a production technology of the high-strength high-toughness steel plate. The production technology comprises the steps of smelting, continuous casting, plate blank reheating, scale removal, rolling, hot straightening and heat treatment. The yield strength of the steel plate disclosed by the invention can reach 690Mpa.

Description

technical field [0001] The invention relates to the technical field of heat treatment of medium and thick plates, in particular to a production process of high-strength and high-toughness steel plates. Background technique [0002] Low-alloy, high-strength and high-toughness steels are widely used in various construction machinery, especially high-strength construction machinery steel with a yield strength of 690MPa, which is widely used in electric wheel turning vehicles, mining vehicles, excavators, bulldozers, various cranes, Coal mine hydraulic support, etc. The service conditions of these construction machinery are harsh, so the steel for construction machinery is required to have high strength, good low temperature toughness, good fatigue resistance, good cold forming performance, good welding performance, etc. As construction machinery becomes larger and more efficient, and the service conditions become more stringent, the demand for high-strength steel plates for co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/28C22C33/04C21D8/02
Inventor 刘泽田董瑞峰陆斌吴鹏飞王宏盛张大治李浩黄楠岳祎楠白永强刘丹宋立全高军张晓燕刘哲惠鑫孙长玉唐家宏
Owner INNER MONGOLIA BAOTOU STEEL UNION