JPS58104159A - Solid drawn tube of stainless steel - Google Patents

Abstract

PURPOSE:To obtain an inexpensive solid drawn tube with superior cold workability and corrosion resistance by using a ferritic stainless steel perpared by adding specified percentages of C, Si, Mn, P, S, Cr and Ti to Fe. CONSTITUTION:A ferritic stainless steel consisting of, by weight, <=0.05% C, <= 0.05% Si, <=0.50% Mu, <=0.040% P, <=0.030% S, 16.00-18% Cr, 0.25-1.0% Ti and the balance Fe with inevitable impurities and having superior cold workability and corrosion resistance is prepared, and a solid drawn tube is manufactured with the steel. Thus, a needle for injection and the ink holder of a ball-point pen can be manufactured inexpensively.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drawn pipe made of ferritic stainless steel which has excellent cold workability and corrosion resistance.

Conventionally, the barrels of ballpoint pens and fountain pens have been made of brass plated with chrome.

However, brass has poor capital resistance and develops rust such as patina, which poses a sanitary problem.

For this reason, in recent years, shaft members have been manufactured from stainless steel such as 5US304.

This stainless steel 9 contains carbon C1 silicon 5i17:y
i7Mn-,! JP, sulfur S1 nickel N
Since it contains chromium, Cr, etc., it has very good corrosion resistance, but on the other hand, it contains nickel, which makes it difficult to mold and process, and it is also very expensive. was. In particular, the biggest problem with pipe materials is that they are difficult to form because they require processing operations such as drawing.

In view of the above-mentioned drawbacks, this chapter's poles are designed for ballpoint pens, fountain pen shafts,
As a result of various research into tube materials used for the spring bars of stethoscopes and watch bands, we have developed a tube material that has sufficient corrosion resistance to withstand use, is easy to mold, and can be provided at a low cost. It has been discovered that when nickel is removed from steel, it is extremely easy to form, process, etc., is inexpensive, and does not significantly reduce its durability.

From the chemical composition table in Table 1, it can be seen that compared to the conventional Cr-Ni stainless steel, the present steel does not contain Ni at all or contains only a small amount of Ni, and is therefore cheaper.

Also, from Table 2, this steel has higher hardness and elongation than conventional steel, and is slightly inferior in toughness, but its yield strength is nearly twice that of conventional steel, so it does not lack strength in use. It can be seen that it can withstand normal use.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a drawn tube 1 of the present invention, which has a cylindrical shape with a through opening in the center.

The chemical composition of the stainless steel used for this tube material 1 (hereinafter referred to as implementation steel) is as shown in Table 3.

Table 3 As shown in Table 3, since the steel used does not contain Ni, the cost reduction is significant, but the characteristics of each steel are not significantly reduced as described below.

Next, Table 4 shows the mechanical properties of this steel, and Table 5 shows test values showing its formability.

Table 4 Table 5 From Table 4, it can be seen that the strength and elongation of the present dog steel are equal to or greater than those of general structural rolled steel, and there is no problem in use.

Table 5 also shows that the steel of this embodiment has remarkable deep drawing formability, gn,
It can be seen that the stretchability, which is a weak point of ferrite, has also been improved.

Figures 2 and 3 show examples of pipe materials using this steel. Figure 2 shows one applied to the outer barrel of a ballpoint pen 2, and Figure 3 shows one applied to a spring bar 3 for a watch band. , which is formed by drawing process.

Therefore, drawn pipes using wood texture can be manufactured at low cost because they do not contain Ni. Therefore, when used for thin tubes such as injection needles, it will not be corroded by chemicals and can be disposable, and it can also be used for other purposes, such as inexpensive products that have not been used until now, such as the shaft of a ballpoint pen. Steel available.

In addition, the wood tone has good cold modification properties, making it easy to manufacture thin drawn pipes.The inner and outer surfaces of the drawn pipes are smooth, so even if liquid is put inside the pipe, it will not flow easily. It is suitable for use with injection needles, etc., and also works well with ballpoint pens.

Furthermore, since the drawn tube has a smooth surface with no cracks in appearance, it is pleasant to the touch and does not lose its high-class image even when applied to writing instruments such as ballpoint pens and fountain pens, and some accessories.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention. Fig. 1 is a perspective view of a drawn tube of the present invention, Fig. 2 is a perspective view of the tube material applied to a ballpoint pen, and Fig. 3 is a perspective view of the tube material applied to a spring for a watch band. It is a perspective view applied to a rod. 1... Drawn pipe patent applicant Isao Tomizawa

Claims (1)

[Claims] In terms of weight, c: o, ns or less Si: 0.50 or less Mn: 0.50 or less P: 0.040% or less s: o, oao or less Cr: 16°00 -18 Ti: 0.25 - 1.0 Remaining part: Drawn pipe made of stainless steel with excellent cold workability and corrosion resistance free from iron and inevitable impurities.