Stainless steel, stainless steel wire rod for ballpoint pen head and preparation method thereof

Abstract

The invention provides stainless steel, a stainless steel wire for the pen point of a ball-point pen, a preparation method of the stainless steel, and a preparation method of the stainless steel wire. The stainless steel comprises the following components in percentage by weight: 0.03% or less of C, 0.20-0.50% of Si, 0.90-1.50% of Mn, 0.050% or less of P, 0.20-0.40% of S, 19.0-21.0% of Cr, 1.50-2.50% of Mo, 0.030% or less of N, 0.10-0.30% of Pb, 0.01-0.07% of Te, 0.05-0.30% of V, 0.01-0.50% of Nb, 0.10-0.50% of Ni, 0.10-0.50% of Cu, 0.005-0.020% of O, and the balance of Fe and inevitable impurities. The preparation method of the stainless steel comprises the following steps of: performing primary smelting; performing refining; and performing continuous casting. The preparation method of the stainless steel wire comprises the following steps of: performing primary smelting; performing refining; performing continuous casting; performing heating for the first time; performing rolling for the first time; performing surface treatment; performing heating for the second time; and performing rolling for the second time.

Description

technical field [0001] The invention relates to a stainless steel and a preparation method thereof, in particular to a ferritic stainless steel wire material for a ballpoint pen head and a preparation method thereof. Background technique [0002] A ballpoint pen is a writing tool that uses a ball to roll out a writing medium (ink or ink) to form handwriting, including ballpoint pens, gel pens, medium oil pens, and erasable ballpoint pens. [0003] The structure of the ball point pen head (ball seat body) is relatively complicated, and it is processed by a multi-station automatic lathe with fast cutting speed and high processing and assembly precision. The one-way gap between the ball and the ball seat is about 0.005mm. If the one-sided gap is too small, the ink will not flow smoothly, and if it is too large, the ink will leak, and even the ball will fall off. [0004] The performance requirements of the ballpoint pen material are mainly corrosion resistance and easy cutting...

AI Technical Summary

Problems solved by technology

[0005] Ballpoint pen head materials generally include lead brass, nickel cupronickel and free-cutting stainless steel. Lead brass was used at the earliest. Due to its poor corrosion resistance and wear resistance, it was gradually replaced by nickel cupronickel. However, the corrosion resistance of nickel cupronickel is still worse than that of stainless steel. , so high-end ballpoint pen nibs should be processed with easy-cutting stainless steel

[0006] Free-cutting stainless steel can be generally divided into three categories according to the organization: austenite, martensite, and ferrite. Among them, the austenite structure has the characteristics of high toughness, and the martensite structure has high hardness and brittleness. After adding sulfur, the two structures have a certain degree of machinability, but they cannot meet the cutting requirements of ballpoint pens.

The strength and hardness of the ferrite structure are low. During cutting, the chips are long and not brittle, and bonded to the front of the tool, resulting in built-up edge, which deteriorates the cutting performance, and cannot achieve the ultra-easy cutting performance required for the manufacture of ballpoint pen tips.

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