Fasteners such as bolts and nuts made of high-strength steel

A technology of high-strength steel and fasteners, applied in the field of mechanical parts, can solve problems such as prolonging production cycle, reducing productivity, wasting energy, etc., and achieving the effect of improving production efficiency, improving performance and saving energy

Active Publication Date: 2011-11-30
NANTONG HAIOU LIFE SAVING & PROTECTION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, no matter it is annealing before cold working or heat treatment of quenching and tempering after cold working, it not only wastes energy, but also prolongs the production cycle and reduces productivity, especially the annealing before cold working will cause surface oxidation after annealing. It is necessary to further implement the process of removing the oxide film by pickling and covering the surface with a lubricating film. These are obviously not suitable for the requirements of the modern society for the steel industry, and urgent improvements are needed

Method used

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Embodiment

[0017] Step 1), design and smelt the raw material steel with suitable chemical composition, the raw material steel of the present invention contains by mass percentage, C 0.23, Si 0.07, Mn 0.35, Al 0.09, Mo 0.60, Cr 1.30, Ti 0.06, Nb 0.06 , V 0.06, Cu 0.70, W 0.70, B 0.001, P 0.006, S 0.007;

[0018] Step 2), the raw material steel is subjected to hot rolling processing, wherein soaking at 1200°C for 2 hours, the starting rolling temperature is about 1010°C, the final rolling temperature is about 930°C, the coiling temperature is 720°C, and the cooling rate is about 1°C / S. After hot rolling Steel diameter is about 10mm;

[0019] Step 3), the hot-rolled steel is subjected to wire drawing processing with a processing rate of 8%;

[0020] Step 4), cold processing the steel after wire drawing processing to become a part blank with a desired shape;

[0021] Step 5), processing and forming threads at a specific part of the part blank by means of thread rolling or the like;

[002...

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Abstract

The invention relates to a fastener with high performance and low cost, such as a screw bolt, a screw nut and the like made from high-strength steel. The raw material steel of the fastener contains the following ingredients in percentage by mass: 0.2-0.25% of C, 0.05-0.1% of Si, 0.3-0.4% of Mn, 0.08-0.1% of Al, 0.5-0.8% of Mo, 1.2-1.4% of Cr, less than 0.5% of Ni, 0.05-0.07% of Ti, 0.05-0.07% of Nb, 0.05-0.07% of V, 0.6-0.8% of Cu, 0.5-0.8% of W, 0.001-0.002% of B, less than 0.008% of P and less than 0.008% of S. An economical preparing process which has no need of carrying out annealing treatment before cold-processing is realized by using the unique processing steps, such as hot-rolling processing, drawing processing, cold-processing, quenching and tempering and the like and the excellent-malleability fastener with high tensile strength over 1300 MPa and over 4% percentage elongation.

Description

technical field [0001] The invention relates to a mechanical part, in particular to a fastener such as a bolt, a nut and the like prepared from high-strength steel. Background technique [0002] With the rapid development of modern industry, various production departments such as automobiles, machinery, construction, and light industry have put forward higher requirements for various fasteners (such as bolts, nuts, etc.). Especially in the field of the automobile industry, in order to meet the increasingly strong requirements for high performance and lightweight of various structural parts, it is undoubtedly the most effective to implement high-strength and lightweight bolts and nuts that are used to manufacture fastening parts. means. In addition, due to the requirements of weather resistance, corrosion resistance and other aspects, there are more and more strict requirements for the corresponding performance of bolts and nuts. [0003] While meeting the performance requi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/54C22C38/32
Inventor 曾美霞
Owner NANTONG HAIOU LIFE SAVING & PROTECTION EQUIP
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