High-cleanliness spring steel and production method thereof
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A production method and high cleanliness technology, applied in the production of high cleanliness spring steel, in the field of high cleanliness spring steel, can solve the problems of high number and density of inclusions, the performance of spring steel cannot meet the market demand, and the size of inclusions is large.
Active Publication Date: 2021-07-02
ZHANGJIAGANG RONGSHENG SPECIAL STEEL CO LTD +2
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Problems solved by technology
In view of the spring steel prepared by the current production process in this technical field, there are problems such as large inclus
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Embodiment 1
[0054] (1) Pretreatment
[0055] The hot metal from the blast furnace is desulfurized in the KR desulfurization unit. The chemical composition of the desulfurizer used includes: CaO 80190%, CaF 2 10115%, and the rest are unavoidable impurities; the slag removal rate of desulfurization is 97%.
[0056] Among them, the temperature, C content, S content, Si content, Ti content, P content of the blast furnace molten iron, the temperature of the molten iron after desulfurization, and the S content in the molten iron after desulfurization are shown in Table 1.
[0057] [Table 1]
[0058]
[0059] (2) Converter smelting
[0060] The molten iron after pretreatment is mixed with high-quality scrap steel with a thickness of 2 mm to form molten steel and loaded into a converter for desiliconization, dephosphorization, and oxygen blowing decarburization. Scrap steel meets: S≤0.012%, P≤0.015%, Ti≤0.015% scrap steel;
[0061] Use a slide plate to block slag and tap slag. At the begi...
Embodiment 2
[0078] (1) Pretreatment
[0079] The hot metal from the blast furnace is desulfurized in the KR desulfurization unit. The chemical composition of the desulfurizer used includes: CaO 80190%, CaF 2 10115%, and the rest are unavoidable impurities; the slag removal rate of desulfurization is 98%.
[0080] Among them, the temperature, C content, S content, Si content, Ti content, P content of the blast furnace molten iron, the temperature of the molten iron after desulfurization, and the S content in the molten iron after desulfurization are shown in Table 4.
[0081] [Table 4]
[0082]
[0083] (2) Converter smelting
[0084] The pretreated molten iron is mixed with high-quality steel scrap with a thickness of 1 mm to form molten steel and loaded into a converter for desiliconization, dephosphorization, and oxygen blowing decarburization. Scrap steel meets: S≤0.012%, P≤0.015%, Ti≤0.015% scrap steel;
[0085] Use a slide plate to block slag and tap slag. At the beginning of t...
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Abstract
The invention discloses high-cleanliness spring steel and a production method thereof. The production method comprises the following steps: pretreatment: desulfurizing molten iron until the content of S in the molten iron is less than or equal to 0.0015%; mixing the molten iron and waste steel into molten steel, carrying out desiliconization, dephosphorization and oxygen blowing decarburization, obtaining the molten steel with the temperature of 111011110 DEG C, the C content of 0.1010.15%, the O content of smaller than or equal to 0.045%, the P content of smaller than or equal to 0.011% and the S content of 0.00110.008%, carrying out slag stopping tapping, carrying out deoxidation alloying, and the flow of argon blowing at the bottom of a steel ladle during tapping and the flow of argon blowing at the bottom of the steel ladle after tapping are 80011000 NL/min and 1001200 NL/min respectively; refining the molten steel to adjust chemical components and inclusions, and the flow rates of the argon blowing at the bottom of the steel ladle are respectively 1001500 NL/min, 2001100 NL/min and 501100 NL/min in other time when slag charge adding and alloying treatment are carried out and the temperature is increased by electrifying; then carrying out vacuum refining and vacuum breaking soft stirring in sequence, and the flow of the argon blowing at the bottom of the steel ladle is 20150 NL/min and 501100 NL/min; and casting into a steel billet. In the high-cleanliness spring steel prepared through the production method, the density of inclusions with the size larger than 5 micrometers is smaller than or equal to 0.5pcs/mm < 2 >, the length-width product of the maximum inclusions is smaller than or equal to 900 micrometers < 2 >, and the high-cleanliness spring steel has high cleanliness.
Description
technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a spring steel with high cleanliness and a production method for spring steel with high cleanliness. Background technique [0002] As a safety load-bearing component, springs are widely used in automobiles, machinery, railways and other fields. During their service, springs often bear high-cycle alternating loads, and their failure mode is mainly fatigue fracture. A large number of studies have shown that inclusions are an important cause of fatigue failure. [0003] Due to the weak bonding force between the inclusions and the spring matrix, and the large difference in elastic modulus between the two, stress concentration will occur at the interface between the inclusions and the spring matrix during the service of the spring. When the stress exceeds a certain range, the A crack source will be formed at the inclusion, and under continuous alternating ...
Claims
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