A kind of cold heading steel and its manufacturing process

A manufacturing process and technology for cold heading steel, applied in the field of cold heading steel and its manufacturing process, can solve the problems of increased Si in molten steel, unstable pourability, and direct flow affecting product quality and production, so as to achieve good pourability, It is not easy to nodulate the nozzle, and the effect of improving the cleanliness

Active Publication Date: 2020-01-14
SHOUGANG SHUICHENG IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the grain refinement degree of steel, corrosion resistance and reduce total oxygen, cold heading steel often has a certain amount of Al, but when the Al content increases, nozzle nodules and other problems are prone to occur
In the existing technology, the process for cold heading steel SWRCH22A (JIS Japanese standard medium steel grade) has the problems of serious Si increase in molten steel and unstable castability, which affects product quality and smooth production

Method used

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  • A kind of cold heading steel and its manufacturing process
  • A kind of cold heading steel and its manufacturing process
  • A kind of cold heading steel and its manufacturing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] This embodiment provides a manufacturing process of cold heading steel, which includes the following steps.

[0061] S1, smelting steps

[0062] Using molten iron as raw material, the composition of molten iron is Si: 0.30wt%, Mn: 0.30wt%, P≤0.120wt%, S≤0.050wt%, Cr≤0.20wt%, Ni≤0.10wt%, Cu≤0.15wt% , As≤0.015wt%. The temperature of molten iron is 1250°C. According to the loading capacity of 91.5t, it enters the 100t converter for smelting.

[0063] The deoxidation alloying operation is carried out during the tapping process, and the Al-Mn-Fe alloy is put into the ladle for deoxidation. The addition amount of the first batch of continuous casting is 4kg / ton of steel, and the addition amount of subsequent continuous casting batches is 4.5kg / ton For steel, the lack of Mn is made up with medium carbon ferromanganese, and 50kg steel core aluminum is added to each furnace of steel for final deoxidation. Add synthetic slag (active lime + fluorite) 300kg / furnace during tappi...

Embodiment 2

[0077] This embodiment provides a manufacturing process of cold heading steel, which includes the following steps.

[0078] S1, smelting steps

[0079] Using molten iron and some scrap steel as raw materials, the composition of molten iron is Si: 0.50wt%, Mn: 0.50wt%, P≤0.120wt%, S≤0.050wt%, Cr≤0.20wt%, Ni≤0.10wt%, Cu≤ 0.15wt%, As≤0.015wt%. The temperature of molten iron is 1250°C. According to the loading capacity of 92t, it enters the 100t converter for smelting.

[0080] The deoxidation alloying operation is carried out during the tapping process, and the Al-Mn-Fe alloy is put into the ladle for deoxidation. The addition amount of the first batch of continuous casting is 4kg / ton of steel, and the addition amount of subsequent continuous casting batches is 4.5kg / ton For steel, the lack of Mn is made up with medium carbon ferromanganese, and 50kg steel core aluminum is added to each furnace of steel for final deoxidation. Add synthetic slag (active lime + fluorite) 300kg / ...

Embodiment 3

[0094] This embodiment provides a manufacturing process of cold heading steel, which includes the following steps.

[0095] S1, smelting steps

[0096] Using molten iron and some scrap steel as raw materials, the composition of molten iron is Si: 0.80wt%, Mn: 0.80wt%, P≤0.120wt%, S≤0.050wt%, Cr≤0.20wt%, Ni≤0.10wt%, Cu≤ 0.15wt%, As≤0.015wt%. The temperature of molten iron is 1250°C. According to the loading capacity of 92.5t, it enters the 100t converter for smelting.

[0097]The deoxidation alloying operation is carried out during the tapping process, and the Al-Mn-Fe alloy is put into the ladle for deoxidation. The addition amount of the first batch of continuous casting is 4kg / ton of steel, and the addition amount of subsequent continuous casting batches is 4.5kg / ton For steel, the lack of Mn is made up with medium carbon ferromanganese, and 50kg steel core aluminum is added to each furnace of steel for final deoxidation. Add synthetic slag (active lime + fluorite) 300kg...

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Abstract

The invention relates to the field of metallurgy, and discloses cold heading steel and a manufacturing technology thereof. The manufacturing technology of the cold heading steel comprises the steps of smelting, refining, casting and steel rolling. In the step of the refining, Al and calcium carbide are used to make white slag for deoxidation on molten steel; the refined molten steel comprises the following components, 0.17-0.19wt% of C, less than or equal to 0.07wt% of Si, 0.80-0.88wt% of Mn, less than or equal to 0.020wt% of P, less than or equal to 0.015wt% of S, 0.025-0.035wt% of Al, 25-35ppm of Ca, less than or equal to 10ppm of [O], and the balance impurities and Fe; and the degree of superheat of the molten steel of a tundish in the step of the casting is 30-40 DEG C. According to the manufacturing technology, Si increasing can be avoided effectively, good drawability of the finished cold heading steel can be ensured, the casting is stable, a nozzle is not prone to nodulation, and smooth production is facilitated.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a cold heading steel and a manufacturing process thereof. Background technique [0002] Cold heading steel is a special steel for producing standard fasteners and non-standard fasteners by cold heading forming process. The cold heading process can save raw materials, reduce costs, and increase the tensile strength and performance of the workpiece through cold work hardening. The steel for cold heading must have good cold forging performance. Because the cold heading process requires the steel to have high cleanliness, the content of Si and Al in the steel is controlled to improve the plasticity and cold forging performance of the steel. Experience shows that when the silicon content exceeds 0.17% and the carbon content is high, it will have a great impact on the plasticity of the steel. Even if the high-silicon steel is annealed, it will not soften and reduce the cold plastic deformat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22C38/04C22C38/02C22C38/06C21C7/06B22D11/18
CPCB22D11/182C21C7/0006C21C7/06C22C33/04C22C38/002C22C38/02C22C38/04C22C38/06
Inventor 刘立德袁传信陈景玉李燚龙国荣李正嵩高长益叶雅妮张东升陈海英丁云江
Owner SHOUGANG SHUICHENG IRON & STEEL GRP
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