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Drill steel BG22SiMnNi2CrMoA and preparation method thereof

A brazing steel and steel technology, applied in the field of steel preparation, can solve problems such as poor control of steel burning temperature, time, composition control, and high resistance of rolling mills, so as to ensure the uniformity of steel structure, ensure the uniformity of internal quality, reduce the The effect of the influence of small steel resistance

Inactive Publication Date: 2018-09-18
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the international advanced drill steel, the design of the steel composition of the drill steel in my country is basically the same, but the service life and quality of the drill products produced are quite different, which cannot fully meet the production needs. The existing preparation methods of the drill steel exist The following questions:
[0004] (2) The alloy content of BG22SiMnNi2CrMoA steel is high, and the composition of Si, Mn, Cr, Ni, Mo and V is difficult to control;
[0005] (3) Defects such as alloy composition segregation and porosity are prone to occur in the continuous casting process;
[0007] (5) The rolling process with high alloy content has greater resistance to the rolling mill;
[0008] (6) Steel needs to be annealed, and the temperature and time of burning steel are not easy to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Brazing steel BG22SiMnNi2CrMoA, by weight percentage, includes the following components: C: 0.19%, Si: 1.65%, Mn: 1.25%, P: ≤0.012%, S: ≤0.010%, Cr: 0.25%, Ni: 1.90%, Mo: 0.35%, Cu: ≤0.15%, and the balance is iron and unavoidable impurities.

[0029] The preparation method of this brazing steel BG22SiMnNi2CrMoA is as follows:

[0030] Blast furnace hot metal goes through hot metal pretreatment in turn→electric furnace smelting→refining furnace LF→vacuum degassing VD→medium billet continuous casting 235mm×265mm continuous casting slab→walking heating furnace heating→high pressure water descaling→rough rolling mill rolling→continuous rolling Unit→slow cooling→annealing→finishing→flaw detection→inspection to obtain steel,

[0031] Among them, the electric furnace smelting adopts 50t electric furnace smelting, and the carbon reaches the target content requirement of 0.19%, and then the steel is deoxidized and alloyed;

[0032] The refining furnace LF is operated with whit...

Embodiment 2

[0037] Brazing steel BG22SiMnNi2CrMoA, by weight percentage, includes the following components: C: 0.22%, Si: 1.35%, Mn: 1.45%, P: ≤0.012%, S: ≤0.010%, Cr: 0.35%, Ni: 1.70%, Mo: 0.40%, Cu: ≤0.15%, and the balance is iron and unavoidable impurities.

[0038] The preparation method of this brazing steel BG22SiMnNi2CrMoA is as follows:

[0039] Blast furnace hot metal goes through hot metal pretreatment in turn→electric furnace smelting→refining furnace LF→vacuum degassing VD→medium billet continuous casting 235mm×265mm continuous casting slab→walking heating furnace heating→high pressure water descaling→rough rolling mill rolling→continuous rolling Unit→slow cooling→annealing→finishing→flaw detection→inspection to obtain steel,

[0040] Among them, the electric furnace smelting adopts 50t electric furnace smelting, and the carbon reaches the target content requirement of 0.22%, and then the steel is deoxidized and alloyed;

[0041] The refining furnace LF is operated with whit...

Embodiment 3

[0046]Brazing steel BG22SiMnNi2CrMoA, by weight percentage, includes the following components: C: 0.20%, Si: 1.50%, Mn: 1.35%, P: ≤0.010%, S: ≤0.008%, Cr: 0.30%, Ni: 1.80%, Mo: 0.37%, Cu: ≤0.10%, and the balance is iron and unavoidable impurities.

[0047] The preparation method of this brazing steel BG22SiMnNi2CrMoA is as follows:

[0048] Blast furnace hot metal goes through hot metal pretreatment in turn→electric furnace smelting→refining furnace LF→vacuum degassing VD→medium billet continuous casting 235mm×265mm continuous casting slab→walking heating furnace heating→high pressure water descaling→rough rolling mill rolling→continuous rolling Unit→slow cooling→annealing→finishing→flaw detection→inspection to obtain steel,

[0049] Among them, the electric furnace smelting adopts 50t electric furnace smelting, and the carbon reaches the target content requirement of 0.20%, and then the steel is deoxidized and alloyed;

[0050] The refining furnace LF is operated with white...

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Abstract

The invention discloses drill steel BG22SiMnNi2CrMoA and a preparation method thereof. The drill steel BG22SiMnNi2CrMoA comprises, by weight percentage, 0.19-0.22% of C, 1.35-1.65% of Si, 1.25-1.45% of Mn, smaller than or equal to 0.012% of P, smaller than or equal to 0.010% of S, 0.25-0.35% of Cr, 1.70-1.90% of Ni, 0.35-0.40% of Mo, smaller than or equal to 0.15% of Cu, and the balance Fe and inevitable impurities. The drill steel BG22SiMnNi2CrMoA is good in component uniformity and low in segregation degree; and the preparation method solves the problems that existing steel for producing rock drilling tools is mostly produced by adopting die casting or electroslag remelting, the finished steel rate is low, cost is high, the yield is small, and the production rhythm is slow.

Description

technical field [0001] The invention relates to the field of steel preparation, and in particular provides brazing steel BG22SiMnNi2CrMoA and a preparation method thereof. Background technique [0002] With the rapid development of my country's industry, the demand for mining resource products and electric energy in various domestic industries continues to grow, and the quality requirements for brazing steel and brazing tools are getting higher and higher. Compared with the international advanced drill steel, the design of the steel composition of the drill steel in my country is basically the same, but the service life and quality of the drill products produced are quite different, which cannot fully meet the production needs. The existing preparation methods of the drill steel exist The following questions: [0003] (1) The smelting rhythm of electric furnace continuous casting is fast, the ratio of molten iron is small, and the content of scrap steel alloy is high; [00...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/42C22C38/34C22C33/04C21C7/10C21D1/26
CPCC22C38/02C21C7/10C21D1/26C22C33/04C22C38/04C22C38/34C22C38/42C22C38/44
Inventor 张群赵千水
Owner BENGANG STEEL PLATES
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