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A kind of non-quenched and tempered cold heading steel wire rod for high-strength fasteners and preparation method thereof

A fastener and cold heading steel technology, applied in the field of cold heading steel, can solve problems such as energy consumption, cost increase, environmental pollution, etc., and achieve the effects of improving mechanical properties, reducing processing costs, and improving strength and plasticity

Active Publication Date: 2021-11-23
ZENITH STEEL GROUP CORP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the average cost of spheroidizing annealing for wire rod or steel wire in the fastener industry is about 400 yuan / ton, and the cost of quenching and tempering heat treatment for fasteners after cold heading is about 500 yuan / ton. The cost of producing 10.9 grade fasteners has risen sharply, and at the same time it has brought high energy consumption and a lot of environmental pollution

Method used

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  • A kind of non-quenched and tempered cold heading steel wire rod for high-strength fasteners and preparation method thereof
  • A kind of non-quenched and tempered cold heading steel wire rod for high-strength fasteners and preparation method thereof
  • A kind of non-quenched and tempered cold heading steel wire rod for high-strength fasteners and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Composition design

[0033] The chemical composition is designed by weight percentage as C: 0.16%, Si: 0.07%, Mn: 1.43%, P: 0.005%, S: 0.006%, Ti: 0.052%, V: 0.10%, Al: 0.08%, N: 65ppm, the rest is Fe and unavoidable impurities.

[0034] 2. Converter smelting

[0035] Steelmaking raw materials are added to the converter (steelmaking raw materials are molten iron, pig iron and scrap steel, wherein pig iron accounts for 5% of the total weight of steelmaking raw materials, scrap steel accounts for 5% of the total weight of steelmaking raw materials, and the total loading capacity of steelmaking raw materials is 130t / Bottom-blowing nitrogen stirring throughout the converter smelting process, tapping temperature is 1625-1640°C, tapping C is controlled at 0.08%-0.10%, tapping P≤0.008%; starting from tapping 1 / 4, add deoxidizer, alloy ( Nitrogen-manganese alloy, ferro-titanium, ferro-vanadium), carburizer (silicon carbide), slag (lime, calcium carbide).

[0036] 3. LF r...

Embodiment 2

[0043] The chemical composition in Step 1 of Example 1 is replaced by weight percentage as C: 0.18%, Si: 0.16%, Mn: 1.49%, P: 0.005%, S: 0.002%, Ti: 0.059%, V: 0.13% , Al: 0.07%, N: 88ppm, the rest are Fe and unavoidable impurities, and other conditions are the same as in Example 1.

Embodiment 3

[0045] The chemical composition in Step 1 of Example 1 is replaced by weight percentage as C: 0.17%, Si: ≤0.1%, Mn: 1.45%, P: 0.006%, S: 0.003%, Ti: 0.056%, V: 0.12 %, Al: 0.06, N: 70ppm, the rest are Fe and unavoidable impurities, and other conditions are the same as in Example 1.

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PUM

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Abstract

The invention belongs to the technical field of cold heading steel, and particularly relates to a non-quenched and tempered cold heading steel wire rod for high-strength fasteners and a preparation method thereof. The composition of non-quenched and tempered cold heading steel wire rod is C: 0.16~0.18%, Si: ≤0.20%, Mn: 1.40~1.50%, P: ≤0.008%, S: ≤0.008%, Ti: 0.05~0.06%, V: 0.10-0.13%, Al: ≤ 0.01%, N: 60-90 ppm, and the rest are Fe and inevitable impurities. The preparation method includes converter smelting, LF refining, billet continuous casting, and wire rod rolling. The invention effectively improves the strength and plasticity of the steel by optimizing the composition design of the elements in the components, adopts an innovative smelting process, and combines the advanced controlled rolling and controlled cooling technology, and realizes the production of 10.9-grade high-grade steel without annealing and tempering. Strong fasteners, significantly reducing processing costs in downstream industries.

Description

technical field [0001] The invention belongs to the technical field of cold heading steel, and in particular relates to a non-quenched and tempered cold heading steel wire rod for high-strength fasteners and a preparation method thereof. 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 widely used in the production of screws, pins, nuts and other fasteners. It is widely used in automobiles and shipbuilding. , 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 strict. Usually, high-quality carbon is used...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/12C22C38/06C22C33/06C21D8/06C21C7/06C21C7/064C21C7/00
CPCC21C7/0006C21C7/0025C21C7/0056C21C7/06C21C7/064C21D8/065C22C33/06C22C38/02C22C38/04C22C38/06C22C38/12C22C38/14
Inventor 苏振伟周淼
Owner ZENITH STEEL GROUP CORP CO LTD