Cr-B system low-carbon high-strength cold forging steel wire rod and manufacturing method thereof
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A manufacturing method and high-strength technology, applied in the field of cold heading steel, can solve problems such as increased cold heading cracking rate, difficulty in meeting requirements, expensive niobium and vanadium elements, etc., to improve quenching performance, enhance quenching performance, and improve plasticity Effect
Active Publication Date: 2019-11-15
ZENITH STEEL GROUP CORP
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However, it can only be used to produce fasteners such as hexagonal bolts and hexagonal nuts, and cannot meet the production of flange fasteners; and the cold heading cracking rate will increase in the production process of downstream users
In the prior art, there are cold heading steels with low carbon content, such as CN201510525604.2, a production method of boron-containing cold heading steels, but its quenching performance is not outstanding enough, and it can only meet the requirements of grade 10.9 bolts
In CN201010127837.4 boron-containing cold heading steel
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Embodiment 1
[0029] 1. Composition design
[0030] The chemical composition is designed by weight percentage as C: 0.16%, Si: 0.20%, Mn: 0.80%, Cr: 0.75%, Al: 0.030%, Ti: 0.045%, B: 0.0025%, P: 0.016%, S: 0.014%, N: 36ppm, Ti / N: 12.5.
[0031] 2. Converter smelting
[0032] Steelmaking raw materials are added to the converter (steelmaking raw materials are molten iron, pig iron and scrap steel, wherein pig iron accounts for 9% of the total weight of steelmaking raw materials, scrap steel accounts for 3% of the total weight of steelmaking raw materials, and the total charge of steelmaking raw materials is 130t / furnace ), bottom-blown argon stirring in the whole process of smelting converter smelting, tapping temperature is 1628°C, tapping C is controlled at 0.10%, tapping P≤0.008%; starting from tapping 1 / 4, add deoxidizer, alloy, recarburizer, slag in sequence material.
[0033] 3. LF refining
[0034] LF refining time is 36 minutes. In the early stage of LF smelting, aluminum particle...
Embodiment 2
[0040] The chemical components in Step 1 of Example 1 were replaced by C: 0.21% and Cr: 0.55% by weight percentage, and other conditions were the same as in Example 1.
Embodiment 3
[0042] The chemical composition in Step 1 of Example 1 is replaced by Ti: 0.033%, B: 0.0035%, N: 78ppm, Ti / N: 4.2, and other conditions are the same as Example 1.
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Abstract
The invention belongs to the technical field of cold forging steel and particularly relates to a Cr-B system low-carbon high-strength cold forging steel wire rod and a manufacturing method of the Cr-Bsystem low-carbon high-strength cold forging steel wire rod. The main chemical ingredients of the Cr-B system low-carbon high-strength cold forging steel wire rod comprise 0.16-0.24% of C, 0.55-0.90%of Cr, 0.032-0.065% of Ti, 0.0020-0.0040% of B and not larger than 80ppm of N, wherein Ti/N is controlled to be larger than 4. The manufacturing method includes the procedures of converter smelting,LF refining, square billet continuous casting and wire rod rolling. According to the Cr-B system low-carbon high-strength cold forging steel wire rod and the manufacturing method of the Cr-B system low-carbon high-strength cold forging steel wire rod, by optimizing ingredient design of the elements of Cr, B, Ti, N and the like, the hardenability of the steel is effectively improved, the cold forging performance of the steel is improved, it is achieved that the low-carbon cold forging steel wire rod can be used for producing 12.9-grade high-strength fastener without annealing, and the machiningcost of producing high-strength fasteners for a downstream industry is significantly lowered.
Description
technical field [0001] The invention belongs to the technical field of cold heading steel, relates to a Cr-B series low-carbon high-strength cold heading steel wire rod, and also relates to a manufacturing method of the Cr-B series low-carbon high-strength cold heading steel wire rod. 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...
Claims
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