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Chromium-molybdenum metal self-reducing pellets and method for preparing and directly alloying molten steel

A pelletizing and metal technology, applied in the field of metal materials, can solve the problems of high carbon ferrochromium with high carbon content, limited use range, large volatilization loss, etc., to reduce slag alloying, increase reduction reaction rate, and achieve efficient production. effect of the method

Inactive Publication Date: 2016-01-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The smelting of alloy steel is mainly by adding ferroalloy and metal element into molten steel. However, the ferroalloy smelting process has the characteristics of high energy consumption and serious environmental pollution. It is a major strategy to develop alloy steel smelting methods that do not use ferroalloy or use less ferroalloy. Significance; Cr is mainly added to steel through ferrochrome in modern steelmaking production, but the high carbon content of high-carbon ferrochrome also limits its application range; and the addition of Mo is to replace ferromolybdenum with molybdenum oxide blocks. However, the addition of Mo has the problem of large volatilization loss; how to complete the alloying of Cr and Mo elements in steelmaking production at one time, and how to improve the yield of alloy elements are the problems to be solved by the present invention, and no relevant patents have been retrieved or literature reports

Method used

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Examples

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Effect test

Embodiment 1

[0024] Embodiment 1: Smelting 12CrMo steel with self-reducing pellets

[0025] The composition ratio of self-reducing pellets: 45% high-carbon ferrochromium, 40% molybdenum oxide, 10% Mn iron, 5% CaF 2 Wherein the content of Cr and C in the high-carbon ferrochromium is 55%Cr, 8%C respectively, and the balance is Fe and unavoidable impurity; Molybdenum oxide is the molybdenum calcine containing 54wt%Mo, and the balance is SiO 2 , iron oxide and other inevitable impurities; the Mn iron used is 60wt% Mn ferromanganese.

[0026] The preparation method of chromium-molybdenum metal self-reducing pellets is as follows: firstly crush and grind high-carbon ferrochrome powder, molybdenum oxide powder, reducing agent, and fluxing agent into 100-mesh powder, then mix the materials in proportion, and add the total weight of the pellets 4% glucose solution is used as the binder, the mass concentration of the glucose solution is 50%, after mixing, it is sent to a Φ20mm×20mm pellet machine t...

Embodiment 2

[0028] Embodiment 2: Smelting 16CrMo steel with self-reducing pellets

[0029] Composition ratio of self-reducing pellets: 65% high-carbon ferrochromium, 30% molybdenum oxide, 10% Si iron, 5% CaF 2 The content of Cr and C in the high-carbon ferrochromium is 60%Cr, 9%C respectively, and the balance is Fe and unavoidable impurities; the molybdenum oxide is molybdenum calcine containing 55wt%Mo, and the balance is SiO 2 , iron oxide and other inevitable impurities; the Si iron used is 60wt% Si ferrosilicon.

[0030] The preparation method of chromium-molybdenum self-reducing pellets is as follows: firstly crush and grind high-carbon ferrochromium powder, molybdenum oxide powder, reducing agent, and fluxing agent into 200-mesh powder, then mix the materials in proportion, and add the total weight of the pellets 3% glucose solution is used as binder, and the mass concentration of glucose solution is 50%. After mixing, send it to a Φ20mm×20mm pellet machine to press into balls, and...

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Abstract

The invention relates to alloy steel smelting, and particularly relates to a chrome-molybdenum metal self reduction pellet and preparation and direct steel liquid alloying methods thereof. The pellet comprises the following components according to mass percentage: 40-65 percent of high-carbon ferrochrome powder, 15-40 percent of molybdic oxide powder, 5-15 percent of a reductant and 3-5 percent of a flux. The self reduction pellet product is added to a ladle during electric furnace or convertor tapping, under the action of high-temperature molten steel and a pellet inner reductant, metal elements in the pellet are effectively reduced, as a result, the molten steel is directly alloyed; the self reduction pellet product is applied in alloy steel including stainless steel, wear resistant steel and the like, which contain elements Cr and Mo, and not only is the procedure for the production of ferro molybdenum saved, but also the elements Cr and Mo can be added at one time, so that the cost of adding alloy elements is lowered, the smelting cycle is shortened, meanwhile, the use range of high-carbon ferrochrome is widened, and furthermore, the problem that the element Mo is difficult to add and settle and great in volatilization during the steel smelting is solved.

Description

technical field [0001] The invention relates to alloy steel smelting and belongs to the field of metal materials, in particular to chromium-molybdenum metal self-reducing pellets and methods for preparing and directly alloying molten steel. Background technique [0002] With the rapid development of industry, iron and steel materials are used more and more widely, and more and higher requirements are put forward for the performance of iron and steel materials; alloy steel composed of one or several certain alloy elements added to carbon steel, in The use performance and method performance have been further improved; as important alloying elements, Cr and Mo elements are often used to improve the strength, elasticity, toughness, wear resistance and corrosion resistance of alloy steel, and are widely used in stainless steel and wear-resistant steel. Production; In addition, chrome-molybdenum steel and chrome-molybdenum composite materials have good oxidation resistance and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C21C7/00
Inventor 李桂荣曹磊王宏明赵加爱
Owner JIANGSU UNIV
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