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A fastener wire and wire technology, applied in the direction of metal material coating process, etc., can solve the problems of low toughness, prone to cracking, low strength, etc.
Inactive Publication Date: 2020-07-07
DONGGUAN KELEE STEEL WIRE
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Problems solved by technology
[0004] At present, there are many problems in the automotive fasteners produced in my country, such as low strength, low toughness and easy
Method used
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[0015] On the one hand, an embodiment of the present invention provides a method for preparing an automotive fastener wire, comprising the following steps:
[0016] S01. Provide low-carbon alloy steel wire rod, the carbon content of the low-carbon alloy steel wire rod is 0.19wt%-0.21wt%, the boron content is 0.0005wt%-0.0030wt%, the sulfur content is ≤0.025wt%, and the phosphorus content is ≤0.025 wt%;
[0017] S02. Pickling and phosphating the low-carbon alloy steel wire rod in sequence, and then performing a first drawing treatment to obtain a first drawn product;
[0018] S03. Perform spheroidizing annealing treatment on the first drawn product to obtain a spheroidized annealed product; the spheroidizing annealing treatment includes: raising the temperature of the first drawn product to 710-730° C. under a protective atmosphere, Keep warm for 5-8 hours; then cool to 540-560°C at a rate of 15-25°C / hour, then continue to cool to 390-410°C at a rate of 75-85°C / hour, and then ...
Embodiment 1
[0054] This embodiment provides a method for preparing an automotive fastener wire, comprising the following steps:
[0055] S11. Provide low-carbon alloy steel wire rod, the composition of the low-carbon alloy steel wire rod refers to Table 1:
[0058] Through metallographic microscopic examination, the grain size of the low-carbon alloy steel wire rod is 9-10 grades, the non-metallic inclusions are ≤1 grade, no Widmanstatten structure is contained, and the ellipticity of the low-carbon alloy steel wire rod is ≤0.20mm.
[0059] S12. Pickling and phosphating the low-carbon alloy steel wire rod in sequence, and then performing a first drawing treatment to obtain a first drawn product;
[0060] When pickling, use a hydrochloric acid aqueous solution with a mass concentration of 15%, and pickle for 20 mi...
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Abstract
The invention belongs to the technical field of automobile manufacturing, and particularly relates to a preparation method of an automobile fastener wire. The preparation method provided by the invention comprises the steps of providing a low-carbon alloy steel wire, wherein the carbon content of the low-carbon alloy steel wire is 0.19 wt% to 0.21 wt%, and the boron content of the low-carbon alloysteel wire is 0.0005 wt% to 0.0030 wt%; sequentially carrying out acid pickling and phosphorization on the low-carbon alloy steel wire, and then carrying out first drawing treatment to obtain a firstdrawing product; carrying out spheroidizing annealing treatment on the first drawing product, and obtaining a spheroidizing annealing product, wherein the spheroidizing annealing treatment comprisesthe steps of heating the first drawing product to 710-730 DEG C in a protective atmosphere, and keeping the temperature for 5-8 hours; cooling to 540-560 DEG C at a speed of 20 DEG C/h, continuously cooling to 390-410 DEG C at a speed of 80 DEG C/h, and naturally cooling to normal temperature, wherein the protective atmosphere is methanol pyrolysis gas when the temperature is 550 DEG C or above, and the protective atmosphere is nitrogen when the temperature in the furnace is lower than 550 DEG C; and sequentially carrying out acid pickling and phosphorization on the spheroidizing annealing product, and carrying out second drawing treatment, wherein sodium nitrite is adopted as an accelerant for phosphorization.
Description
technical field [0001] The invention belongs to the technical field of automobile manufacturing, and in particular relates to a method for preparing automobile fastener wires. Background technique [0002] Fasteners are widely used in automobiles, engineering, construction and other fields. From the perspective of the development of the entire manufacturing industry, fasteners are called "industrial rice" and "screws" of the national economy. For example, in the automotive product structure, although fasteners only account for a small part of the entire structure, they are one of the indispensable organic components of the automotive product structure and play a more important role. Common fasteners include bolts, screws, studs, nuts, and their assemblies such as washers, retaining rings, pins, rivets, connection pairs, etc. There are many types of automotive fasteners, which are mainly divided into four categories, including standard fasteners, non-standard fasteners, stan...
Claims
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Application Information
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