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Cold heading steel wire rod for annealing-free 10.9-grade fastener and manufacturing method of cold heading steel wire rod

A manufacturing method and technology of cold heading steel, applied in the field of cold heading steel, can solve the problems of increasing product difficulty and failing to meet 10.9 level fasteners

Active Publication Date: 2021-07-06
ZENITH STEEL GROUP CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the export cold heading steel with special requirements on the composition will require that B elements cannot be added. Once the addition of B is not allowed, the difficulty of the product will be increased, which makes many existing technologies unable to meet the requirements for the production of 10.9 fasteners

Method used

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  • Cold heading steel wire rod for annealing-free 10.9-grade fastener and manufacturing method of cold heading steel wire rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Composition design

[0031] The chemical composition is designed by weight percentage as C: 0.25%, Si: 0.05%, Mn: 0.99%, Cr: 0.44%, Al: 0.037%, P: 0.012%, S: 0.011%, Ni: 0.02%, Cu : 0.09%.

[0032] 2. Converter smelting

[0033] Steel-making raw materials are added to the converter (steel-making raw materials are molten iron, pig iron and scrap steel, wherein pig iron accounts for 93% of the total weight of steel-making raw materials, scrap steel accounts for 7% of the total weight of steel-making raw materials, and the total loading of steel-making raw materials is 125t / furnace ), bottom-blown argon stirring in the whole process of smelting converter smelting, tapping temperature is 1590°C, tapping C is controlled at 0.09-0.11%, tapping P, S≤0.010%; Carbon agent, slag.

[0034] 3. LF refining

[0035]In the early stage of the LF refining process, aluminum particles are used to strengthen deoxidation and desulfurization, and aluminum wires are used to adjust the ...

Embodiment 2

[0043] The chemical composition in Step 1 of Example 1 is replaced by weight percentage as the chemical composition design is C: 0.29%, Si: 0.09%, Mn: 1.14%, Cr: 0.49%, Al: 0.030%, P: 0.010%, S: 0.013%, Ni: 0.06%, Cu: 0.10%, and other conditions are the same as in Example 1.

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Abstract

The invention belongs to the technical field of cold heading steel, and particularly relates to a cold heading steel wire rod for an annealing-free 10.9-grade fastener and a manufacturing method of the cold heading steel wire rod. The cold heading steel wire rod for the annealing-free 10.9-grade fastener comprises the following main chemical components of, in percentage by weight, 0.25%-0.29% of C, less than or equal to 0.10% of Si, 0.95%-1.15% of Mn, 0.40%-0.50% of Cr, 0.020%-0.050% of Al, less than or equal%-0.025% of P and S, and less than or equal%-0.20% of Ni and Cu. The manufacturing method comprises a converter smelting process, an LF refining process, an RH vacuum refining process, a square billet continuous casting process and a wire rod rolling process. By optimizing the element composition design of the C, the Mn, the Cr and the like and combining a controlled rolling and controlled cooling scheme, a hot-rolled wire rod has high cold heading performance, the content of C is larger than or equal to 0.25%, B is not added, and the requirements of foreign users for producing special annealing-free 10.9-grade high-strength fasteners are met.

Description

technical field [0001] The invention belongs to the technical field of cold heading steel, and relates to a cold heading steel wire rod for annealing-free grade 10.9 fasteners, and also relates to a manufacturing method of a cold heading steel wire rod for annealing-free grade 10.9 fasteners. Background technique [0002] Cold heading steel is also known as cold heading forming steel. Cold heading is formed by one or more impact loading at room temperature. It is used to produce screws, pins, nuts and other fasteners. It is widely used in automobiles, shipbuilding, and equipment manufacturing. , electronics, home appliances, bicycles, tools, light steel structures, construction and other industries. The cold heading process can save raw materials, reduce costs, and increase the tensile strength of the workpiece through cold work hardening to improve performance. The steel for cold heading must have good cold upsetting performance, and the surface quality of the steel is stri...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42B21C37/04C22C33/06
CPCC22C38/02C22C38/04C22C38/42C22C38/06C22C33/06B21C37/047
Inventor 王礼银苏振伟黄云飞周淼
Owner ZENITH STEEL GROUP CORP
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