Smelting process of Cr-Mn series spring steel

A technology of spring steel and cr-mn, which is applied in the field of metallurgy, can solve the problems of high rate of non-metallic inclusions exceeding the standard, unsatisfactory control of molten steel purity, unreasonable production technology, etc. source, eliminating the pretreatment process of molten iron, and reducing the effect of non-metallic inclusions

Active Publication Date: 2015-07-01
ZENITH STEEL GROUP CORP +1
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  • Claims
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AI Technical Summary

Problems solved by technology

The production of spring steel through the molten iron pretreatment process increases the production cost. At the same time, due to the unreasonable production process, the purity control of molten steel is often not ideal, and the non-metallic inclusions exceed the standard rate. scrap waste

Method used

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  • Smelting process of Cr-Mn series spring steel

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Effect test

Embodiment 1

[0027] Take the production of Cr-Mn series spring steel 51CrV4 as an example:

[0028] Steelmaking process: molten iron (60-70%) + high-quality steel scrap (30-40%) - 100 tons of eccentric bottom electric furnace (EBT) - 100 tons of LF refining furnace - VD furnace - continuous casting machine (5 machines and 5 strands).

[0029] Electric furnace smelting process

[0030] 1. The new furnace lining and the first 3 furnaces of the new ladle shall not smelt this type of steel, and the baking of the ladle shall be strengthened before tapping to ensure the red hot state of the inner lining of the ladle.

[0031] 2. 60-70% of the low-sulfur molten iron and 30-40% of the company's self-produced high-quality steel scrap are used as the steel material for electric furnace smelting.

[0032] 3. The carbon content at the end point of the electric furnace is controlled above 0.15%, and the tapping temperature of the electric furnace is controlled at 1640-1660°C. The EBT electric furnace ...

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Abstract

The invention belongs to the field of metallurgy and discloses a smelting process of Cr-Mn series spring steel. The smelting process of Cr-Mn series spring steel comprises the following steps: (1) by taking a low-sulfur molten iron and a high-quality steel scrap as the electric furnace smelting iron and steel materials, controlling the electric furnace end point carbon content to greater than 0.15%; (2) adding active lime and composite refining slag in the electric furnace tapping process, and adding calcium carbide to perform pre-deoxidation in the tapping process; (3) feeding an Al line in an argon station before LF refining; (4) producing high basicity white slag in the refining earlier stage and controlling the basicity of slag in the refining middle and later stages to 1.5-2.5; (5) controlling the ultimate vacuum front argon flow to 15-25 L/min and controlling the ultimate vacuum late argon flow to 30-45 L/min; (6) adding a granular alkaline covering agent and a carbonized rice hull to perform double protection by VD emptying; and (7) stabilizing the speed of continuous casting to 0.8-0.9 m/min, and controlling the degree of superheat to 20-30 DEG C. By adopting the process, the non-metallic inclusion content in the molten steel is reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy and relates to a steel smelting process, in particular to a Cr-Mn series spring steel smelting process. Background technique [0002] Spring steel is a special steel used to make springs and elastic parts. According to its chemical composition, it is divided into non-alloy spring steel (carbon spring steel) and alloy spring steel. According to the GB / T 13304 "Steel Classification" standard, according to the basic performance and service characteristics, spring steel belongs to mechanical structural steel; according to the quality grade , belongs to special quality steel, that is, steel that requires particularly strict control of quality and performance during the production process. In view of its use, spring steel should have good comprehensive properties such as fatigue resistance, mechanical properties, bullet resistance, hardenability, and physical and chemical properties. In order to meet the abo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C21C7/06C21C7/064C21C7/10
CPCY02P10/20
Inventor 邓向阳
Owner ZENITH STEEL GROUP CORP
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