Ultrahigh strength structural steel BG960 and preparation method

A technology of structural steel and ultra-high strength, applied in the field of special steel preparation technology, can solve the problems of thin-gauge steel plates that cannot be stably produced in batches, poor steel plate shape, high alloying cost, etc., achieve good shape and quality, and reduce energy The effect of consumption and environmental protection

Inactive Publication Date: 2018-08-03
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 3. The shape of the steel plate is not good
[0009] In particular, thin-gauge steel plates (not

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] example,

[0029] Carry out the preparation of ultra-high-strength structural steel BG960 provided by the invention according to the following method:

[0030] 1. Steelmaking

[0031] 1. Hot metal pretreatment process

[0032] Pretreatment into the furnace S≤0.006%, scraping off the slag; using concentrate scrap.

[0033] 2. Converter process

[0034] The converter pulls carbon in one hit to avoid spot blowing; high manganese, ferrosilicon, and ferromolybdenum are used for tapping; the ladle is purged with argon gas before tapping, and the tapping port is controlled to avoid scattering, and the Als of the ladle is controlled at 0.010-0.030%; requirements Ladle N≤25ppm.

[0035] 3. Refining process

[0036] The LF+RH dual-path process is adopted, and the gas content is strictly controlled. It is required to maintain a slight positive pressure during the LF treatment process, strictly control the increase of N in LF, and the amount of N increase is required to be le...

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PUM

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Abstract

The invention belongs to technical field of special steel preparation processes, and particularly provides an ultrahigh strength structural steel BG960 and a preparation method. The structural steel comprises, by weight, 0.15%-0.17% of C, 1.10%-1.30% of Mn, 0.20%-0.30% of Si, 0.010%-0.030% of Al, 0.45%-0.55% of Cr, 0.35%-0.45% of Mo, 0.015%-0.030% of Ti, 0.020%-0.030% of Nb, 0.030%-0.040% of V, 0.020%-0.30% of Ni, 0.0010%-0.0018% of B, no more than 0.010% of P, no more than 0.002% of S, no more than 0.045% of N, no more than 0.002% of O and the balance Fe and inevitable inclusions. According to the preparation method, through control over the types and contents of components and technological parameters, the structural steel BG960 with higher toughness is obtained.

Description

technical field [0001] The invention belongs to the technical field of special steel preparation technology, and particularly provides an ultra-high-strength structural steel BG960 and a preparation method. Background technique [0002] In order to improve equipment efficiency, reduce energy consumption and reduce self-weight, construction machinery is constantly developing in the direction of high-parameterization, large-scale and light-weight. In order to meet the above requirements, a large number of high-strength steels must be used. Compared with the foreign advanced level, my country's ultra-high-strength structural plates with a yield strength of 900MPa or more cannot be completely domestically produced and need to be imported in large quantities. This production process technology heats up the experimental steel to make it austenitized, and transforms the steel plate material from austenite structure to bainite structure through controlled rolling and controlled cool...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50C22C38/48C22C38/46C22C38/54C21D8/00
CPCC22C38/02C21D8/005C22C38/04C22C38/06C22C38/44C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 刘志璞赵迪闵洪刚周晏锋姜文超张城铭吴刚
Owner BENGANG STEEL PLATES
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