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Smelting method of martensite steel for air valve of internal combustion engine

A smelting method and technology of internal combustion engine, applied in the field of iron and steel smelting, can solve the problems of easy oxidation and burning of chromium, increase smelting cost, etc., and achieve the effect of high alloy recovery rate

Inactive Publication Date: 2014-03-26
JIANGSU XINYUE AUTOMOTIVE COMPONENTS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electric furnace → LF ladle refining furnace → vacuum pumping (VD) process, due to the high chromium content in martensitic steel (about 9%), the alloying element chromium is easy to oxidize and burn more seriously in the electric furnace blowing, which increases the smelting process. cost

Method used

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  • Smelting method of martensite steel for air valve of internal combustion engine
  • Smelting method of martensite steel for air valve of internal combustion engine
  • Smelting method of martensite steel for air valve of internal combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Smelting of 45Cr9Si3 martensitic valve steel:

[0025] 1), the chemical composition of 45Cr9Si3 steel is shown in Table 1

[0026] Table 1 Chemical composition of 45Cr9Si3 steel

[0027]

[0028] 2), process flow

[0029] ①Electric arc furnace: about 15t of scrap steel is added, lime is added at 20Kg / ton of steel, smelted by oxidation method, the slag alkalinity is ≥ 1, the scrap steel is fully melted and the slag is removed by shaking the furnace, and silicon carbide 1-1.5kg / t is added in the later stage. Reduction slag, full analysis of sampling before tapping, control C≤0.10%, P≤0.02%, when the temperature is greater than or equal to 1600 °C, no slag is tapped, and 10t of qualified molten steel is guaranteed.

[0030] ② Induction furnace: Add about 5t of chromium-containing stainless steel 430, 2.5t of 0Cr17 stainless steel, 1.5t of low-carbon ferrochrome, and 1.5t of ferrosilicon. After electrification and full melting, the temperature is not less than 1560°C ...

Embodiment 2

[0039] Smelting of 40Cr10Si2Mo martensitic valve steel:

[0040] 1), the chemical composition of 40Cr10Si2Mo steel is shown in Table 1

[0041]

[0042] Table 1 Chemical composition of 40Cr10Si2Mo steel

[0043] 2) Process flow

[0044] Electric arc furnace: Add about 15t of scrap steel, the smelting method is similar to Example 1, the tapping temperature is not less than 1600°C, the molten steel is controlled to have C≤0.10%, P≤0.02%, 10t of slag-free tapping, and 5t of remaining steel.

[0045] Induction furnace: equipped with 250Kg of high-carbon ferrochrome, 3t of return material of valve steel 45Cr9Si3, 2t of 430 stainless steel, 5t of OCr17 stainless steel, 250Kg of ferrosilicon. Electric furnace tapping molten steel.

[0046] In this example, the return material of gas valve steel 45Cr9Si3, which can be used as an alloy material, is added to the induction furnace. Other steel types can be flexibly selected according to the actual production situation. The raw mate...

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Abstract

The invention discloses a smelting method of martensite steel for an air valve of an internal combustion engine. The smelting method comprises the following steps: (1), smelting a chromium-containing alloy material in an induction furnace to obtain alloy mother liquor, and smelting waste steel in an electric-arc furnace to obtain molten steel; (2), mixing the alloy mother liquor obtained in the step (1) into a tapping ladle of the electric-arc furnace; (3), enabling the molten steel mixed with steel to enter an LF (ladle furnace) station for refining, carrying out deoxidation, desulfurization, and component fine adjustment operation, and tapping after the components are qualified; (4), enabling LF refined steel to enter a VD (Vacuum Degassing) station to carry out vacuum degassing operation, casting the discharged steel, and cooling and de-molding to obtain a steel ingot. The method is adopted to produce an alloy element, so that a burnout rate is lowered, an alloy recovery rate is high and a material selection range is large.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, in particular to a method for smelting martensitic internal-combustion engine valve steels whose grades are 40Cr10Si2Mo, 42Cr9Si2, 45Cr9Si3, 51Cr8Si2 in the national standard GB / T12773-2008. Background technique [0002] The development and production of valve steel for internal combustion engines in my country develops along with the continuous innovation of internal combustion engines. Internal combustion engines include diesel engines and gasoline engines, which are mainly used in tractors, ships, motorcycles, automobiles, diesel locomotives, tanks, engineering machinery, oil drilling rigs, etc. Internal combustion engines are commonly known as the heart of motor vehicles, and valves are important components of internal combustion engines. In recent years, with the continuous improvement of internal combustion engine parameters, the operating temperature of valve steel has in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/072C21C7/06C21C7/064C21C5/52
Inventor 张国富叶刚涂玉国柯红什夏友春王冶芳
Owner JIANGSU XINYUE AUTOMOTIVE COMPONENTS
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