Smelting method of steel for automobile suspension spring

A technology of automobile suspension and steel smelting, which is applied in the manufacture of converters, etc. It can solve the problems of large width of inclusions, high oxygen content of molten steel, and different plastic sizes of inclusions.

Active Publication Date: 2021-11-26
SGIS SONGSHAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method does not give the amount of slag control, the range of alkalinity is too large, the slag material is not strictly required, and the Ti content and N content of molten steel components are not required, resulting in low purity of molten steel and the plastic size of inclusions. Not uniform, the overall size is too large, the oxygen content of molten steel is too high, the inclusions are easy to gather, and the width of the inclusions is large during the rolling process, which affects the quality of the steel

Method used

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  • Smelting method of steel for automobile suspension spring

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Effect test

Embodiment 1

[0054] A method for smelting 55SiCr spring steel. The S content of molten iron is 0.002wt% before desulfurization pretreatment, and low-sulfur, low-aluminum, low-titanium high-quality steel scrap is added according to the ratio of scrap steel to molten iron of 0.26:1, so as to ensure that the S content at the end of the converter meets the requirements. Converter smelting adopts double slag smelting, the end point carbon is 0.16wt%, 5 tons of steel is left; 18kg / ton of high-purity ferrosilicon, which accounts for 85wt% of the total amount of ferrosilicon added to smelting, and 5.95kg / ton of low-titanium and high-carbon ferrochrome are added during tapping. per ton of steel, 5.43kg / ton of low-carbon ferromanganese, and 2.25kg / ton of low-nitrogen recarburizer for deoxidation alloying. After that, 3.17kg / ton of lime is added to the converter for tapping, and the basicity of the slag is 3.7. The operation of steel retention is adopted in the tapping of the converter, and the slag ...

Embodiment 2

[0056] A method for smelting 55SiCr spring steel, the S content of which is 0.002wt% is pretreated before molten iron is put into the furnace, and high-quality scrap steel with low sulfur, low aluminum and low titanium is added according to the ratio of scrap steel to molten iron of 0.27:1, so as to ensure that the S content at the end of the converter meets the requirements. Converter smelting adopts double slag smelting, the end point carbon is 0.15wt%, 4.5 tons of steel is left; 18kg / ton of high-purity ferrosilicon, which accounts for 86wt% of the total amount of ferrosilicon added to smelting, and 6.35kg / ton of low-titanium and high-carbon ferrochrome are added during tapping. per ton of steel, 5.83kg / ton of low-carbon ferromanganese, and 2.25kg / ton of low-nitrogen recarburizer for deoxidation alloying. After that, add lime 3.17kg / ton to the steel slag in the converter to control the basicity of the slag at 3.8. The operation of steel retention is adopted in the tapping of...

Embodiment 3

[0058] A method for smelting 55SiCr spring steel. S content of 0.003wt% is pretreated before molten iron is put into the furnace. Low-sulfur, low-aluminum, low-titanium high-quality steel scrap is added according to the ratio of scrap steel to molten iron of 0.29:1, so as to ensure that the S content at the end of the converter meets the requirements. Converter smelting adopts double slag smelting, the end point carbon is 0.17wt%, 5 tons of steel is left; 21kg / ton of high-purity ferrosilicon, accounting for 90wt% of the total amount of ferrosilicon added to smelting, and 6.13kg / ton of low-titanium, high-carbon ferrochrome are added during tapping. per ton of steel, 5.54kg / ton of low-carbon ferromanganese, and 2.45kg / ton of low-nitrogen recarburizer for deoxidation alloying. Afterwards, 2.97kg of lime is added to the converter to control the basicity of the slag at 3.9. The operation of steel retention is adopted in the tapping of the converter, and the slag of the converter is...

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Abstract

The invention discloses a smelting method of steel for an automobile suspension spring, and belongs to the technical field of metal smelting. The smelting method comprises the steps that a slag adding process is controlled strictly and the smelting method is implemented in three steps; 1, slagging is achieved, converter tapping is achieved, 2.87 kg / ton steel to 3.27 kg / ton steel of lime is added to for slag high alkalinity control; 2, slagging is achieved: before LF refining and heating is achieved, 1.40 kg / ton steel to 1.60 kg / ton steel of the lime and 5.60 kg / ton steel to 5.80 kg / ton steel of low-alkalinity synthetic slag are added to make high-alkalinity slag; and step 3, slagging is achieved: sampling is achieved at the 1 / 3 stage of LF refining, 5.60 kg / ton steel to 5.80 kg / ton steel of the low-alkalinity synthetic slag is added, the alkalinity of the slag is reduced to 0.86-1.14, and plastic modification is carried out on inclusions. According to the smelting method of the steel for the automobile suspension spring, the size of the plastic inclusions is reduced, the inclusions are prevented from being gathered, the purity of molten steel is improved, and the inclusions are easily deformed into long and thin strips in the rolling process and are small in width.

Description

technical field [0001] The present application relates to the technical field of metal smelting, in particular to a method for smelting steel for automobile suspension springs. Background technique [0002] Steel for automobile suspension, the representative steel grade is 55SiCr, which is used to make automobile suspension springs. Springs have strict requirements on the fatigue performance of steel, and there are two main ideas for controlling inclusions in steel: [0003] (1) The first idea: the number of inclusions is as small as possible, that is, the oxygen content in the steel is low. Generally, the oxygen content obtained by Al deoxidation is lower than that obtained by Si-Mn deoxidation, so Al deoxidation and high slag alkalinity are generally used. Take the route of high cleanliness; [0004] Correspondingly, the smelting methods of spring steel mainly include: using high alkalinity (R is 4-5) refining slag plus aluminum deoxidation molten steel cleaning process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C21C7/00C21C7/06C22C33/06C22C38/02C22C38/04C22C38/18
CPCC21C5/36C21C7/0087C21C7/0006C21C7/06C22C33/06C22C38/02C22C38/04C22C38/18
Inventor 敖永明鲁金龙张志明刘金源孙忠权余大华岳峰
Owner SGIS SONGSHAN CO LTD
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