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A short-process method for smelting nickel-containing steel in an electric furnace

A short-flow, nickel-steel technology, applied in the field of steelmaking, which can solve problems such as low scope of application

Active Publication Date: 2015-12-30
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the scope of application of this method is low, and it is only suitable for nickel-containing steels with a nickel content of 0.10%-0.50%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Steel type: SAE8620H, Ni content: 0.45-0.75%, melting composition Ni: 0.50%.

[0027] Manufactured in the following order:

[0028] (1) Ingredients: charge structure molten iron + low nickel pig iron. The nickel content in low-nickel pig iron is 1.6%, the total loading of steel material is 55t, the yield of steel material is 90%, the tapping amount is 50 tons, the nickel recovery rate is 99%, and the nickel content is controlled by electric furnace tapping to 0.45%, through the following formula Calculate the loading amount of low-nickel pig iron, wherein the lower limit of nickel content in the nickel-containing steel to be smelted is the lower limit of Ni content in SAE8620H.

[0029] Loading amount of low-nickel pig iron = tapping amount × lower limit of nickel content in nickel-containing steel to be smelted ÷ recovery rate of steel material ÷ nickel content in low-nickel pig iron ÷ nickel recovery rate, which is: 50t × 0.45% ÷ 0.90÷1.6%÷0.99=15.78t.

[0030] The...

Embodiment 2

[0035] Steel type: 37CrNi3, Ni content: 3.00-3.50%, melting composition Ni: 3.26%.

[0036] Manufactured in the following order:

[0037] (1) Ingredients: charge structure molten iron + low nickel pig iron. The nickel content of low-nickel pig iron is 5.5%, the total loading of iron and steel materials is 54t, the yield of iron and steel materials is 90%, the tapping amount is 48.6 tons, the nickel recovery rate is 99%, the nickel content of electric furnace tapping is controlled to 3.00%, and the low is calculated by the following formula The charge of nickel pig iron, wherein, the lower limit of nickel content in the nickel-containing steel to be smelted is the lower limit of Ni content in 37CrNi3:

[0038] Loading amount of low-nickel pig iron = tapping amount × lower limit of nickel content in nickel-containing steel to be smelted ÷ recovery rate of iron and steel material ÷ nickel content in low-nickel pig iron ÷ nickel recovery rate, which is: 48.6t × 3% ÷0.90÷5.5%÷0.9...

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Abstract

The invention relates to a method for smelting nickel-containing steel in a short process by utilizing an electric furnace. The method is characterized by comprising the following steps of (1) burdening; (2) primarily smelting in the electric furnace; (3) LF (low-frequency) refining; and (4) VD vacuum processing. By adopting the method for smelting the nickel-containing steel in the short process by utilizing the electric furnace, the alloy steel and gear steel with the nickel content of 0.3 to 5 percent can be smelted by the electric furnace in a large range at low cost under the situation that existing process equipment is adequately utilized and no investment is increased.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a method for smelting nickel-containing steel with an electric furnace in a short process. Background technique [0002] Nickel, which has good corrosion resistance, is not only widely used in stainless steel, but also because of its solid-solution strengthening, refining ferrite grains, improving the low-temperature impact toughness of steel, and improving the hardenability, strength and fatigue resistance of steel. And reduce the sensitivity to the notch, etc., and as the main alloying element used in some alloy steel, carburized gear steel and other steel, its content is 0.30% to 5.0%. At present, when smelting stainless steel in an electric furnace in a short process, nickel-containing production is generally used for smelting, while in the smelting of nickel-containing alloy steel and carburized gear steel, due to the low nickel content, it is usually used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/064C21C7/10
CPCY02P10/20
Inventor 李法兴张君平王学利翟正龙孙永喜刘永昌杜国强卢乃双袁淑君李小雄
Owner LAIWU IRON & STEEL GRP
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