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690 Mpa-grade low-cost high-toughness bainitic steel plate and production process thereof

A production process, low-cost technology, applied in the field of metallurgy, to achieve the effect of low carbon content, strong adaptability and promotion value, and high cost performance

Inactive Publication Date: 2018-12-21
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from the current development, the demand for thick gauge steel plates with higher strength and better low-temperature toughness will increase, but there is no relevant report on the production of E-grade steel plates with a yield strength of 700MPa and higher low-temperature toughness

Method used

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  • 690 Mpa-grade low-cost high-toughness bainitic steel plate and production process thereof
  • 690 Mpa-grade low-cost high-toughness bainitic steel plate and production process thereof
  • 690 Mpa-grade low-cost high-toughness bainitic steel plate and production process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The thickness of the 690MPa grade low-cost high-strength bainite steel plate in this example is 40 mm, and its chemical composition and mass percentage are: C: 0.07%, Si: 0.20%, Mn: 1.61%, Nb: 0.050%, Ti : 0.01%, Mo: 0.30%, Ni: 0.22%, Alt: 0.040%, Bt: 0.0015%, the balance is Fe and unavoidable impurities; carbon equivalent Ceq=0.43%, welding crack sensitivity coefficient Pcm=0.19%.

[0034] The production process of the 690MPa grade low-cost high-strength and toughness bainite steel plate in this embodiment includes smelting, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0035] (1) Smelting process: molten steel is smelted in an electric furnace, refined in an LF furnace, deeply deoxidized and desulfurized, the composition of the molten steel is adjusted according to the target requirements, and vacuum degassing is carried out when the temperature of the molten steel reaches 1560°C;

[0036] (2) Conti...

Embodiment 2

[0043] The thickness of the 690MPa grade low-cost high-strength bainite steel plate in this example is 20mm, and its chemical composition and mass percentage are: C: 0.03%, Si: 0.30%, Mn: 1.80%, Nb: 0.070%, Ti : 0.019%, Mo: 0.10%, Ni: 0.30%, Alt: 0.030%, Bt: 0.0010%, the balance is Fe and unavoidable impurities; carbon equivalent Ceq=0.38%, welding crack sensitivity coefficient Pcm=0.14%.

[0044] The production process of the 690MPa grade low-cost high-strength and toughness bainite steel plate in this embodiment includes smelting, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0045] (1) Smelting process: molten steel is smelted in an electric furnace, refined in an LF furnace, deeply deoxidized and desulfurized, the composition of the molten steel is adjusted according to the target requirements, and vacuum degassing is carried out when the temperature of the molten steel reaches 1540°C;

[0046] (2) Conti...

Embodiment 3

[0053] The thickness of the 690MPa low-cost high-strength toughness bainite steel plate in this embodiment is 5mm, and its chemical composition and mass percentage are: C: 0.09%, Si: 0.10%, Mn: 1.50%, Nb: 0.030%, Ti : 0.015%, Mo: 0.40%, Ni: 0.25%, Alt: 0.035%, Bt: 0.0019%, the balance is Fe and unavoidable impurities; carbon equivalent Ceq=0.45%, welding crack sensitivity coefficient Pcm=0.21%.

[0054] The production process of the 690MPa grade low-cost high-strength and toughness bainite steel plate in this embodiment includes smelting, continuous casting, heating, rolling and heat treatment processes, and the specific process steps are as follows:

[0055] (1) Smelting process: molten steel is smelted in an electric furnace, refined in an LF furnace, deeply deoxidized and desulfurized, the composition of the molten steel is adjusted according to the target requirements, and vacuum degassing is performed when the temperature of the molten steel reaches 1570°C;

[0056] (2) C...

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Abstract

The invention discloses a 690 Mpa-grade low-cost high-toughness bainitic steel plate and a production process thereof. The steel plate comprises the following chemical components of, by mass percentage, 0.03-0.09% of C, 0.10-0.30% of Si, 1.50-1.80% of Mn, 0.030-0.070% of Nb, less than or equal to 0.02% of Ti, 0.10-0.40% of Mo, 0.20-0.30% of Ni, less than or equal to 0.045% of Alt, less than or equal to 0.002% of Bt and the balance Fe and inevitable impurities; and the production process comprises the processes of smelting, continuous casting, heating, rolling and heat treatment. The steel plate has the characteristics of low welding crack sensitivity coefficient, low carbon content, low cost and the like, the problems that the carbon content and the carbon equivalent of the tempered steelare high, and the welding performance is poor are solved, and the steel plate can meet the requirements of steel in the fields of engineering machinery, heavy-load bridges, energy-saving vehicles, pipelines, ships, ocean platforms and the like in China.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a 690MPa low-cost, high-strength and tough bainite steel plate and a production process thereof. Background technique [0002] Low-carbon bainitic steel is a new type of steel with high strength, high toughness and excellent weldability developed in the world in recent years. It is known as the steel material of the 21st century and is the latest product of the development of modern metallurgical technology. As early as the 1960s, Irwin and Pickering found that when the mass fraction of carbon in the steel approaches zero, the bainite nose in the continuous cooling transformation curve of the steel shifts to the left, so that it forms at a wide range of cooling rates Bainite structure, and under this condition, the strength difference between martensite and bainite structure reaches a negligible level. Coldren et al. gave a linear relationship between the bainite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/064C21C7/10C21D1/18C21D6/00C21D8/02C21D9/00C22C33/04C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14B21B1/46
CPCB21B1/46C21C5/52C21C7/06C21C7/064C21C7/10C21D1/18C21D6/001C21D6/005C21D6/008C21D8/0221C21D9/0081C21D2211/002C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14Y02P10/20
Inventor 陈振业陈起孙力赵燕青杨浩王会岭田志强
Owner HEBEI IRON AND STEEL
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