Environment-friendly lead-free easy-cutting stainless steel used for ball-point pen point and smelting method thereof

A technology of lead-free ballpoint pen and smelting method, which is applied in the field of alloys, can solve problems such as instability, seldom seen, difficult yield of easy-cutting elements, etc., and achieve simple smelting method, low preparation cost, and stable yield Effect

Active Publication Date: 2019-06-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that on the one hand, there is no advanced production process of free-cutting stainless steel for ballpoint pen nibs. It is difficult to add free-cutting elements into steel and the yield is very unstable; another important factor is reflected in the type and quantity of inclusions. , distribution and other studies are not thorough enough, and no inclusion control requirements have been established to meet the special requirements of small hole processing for ballpoint pen nibs
So far, there are few related reports on the study of lead-free and environmentally friendly free-cutting stainless steel for pen heads.

Method used

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  • Environment-friendly lead-free easy-cutting stainless steel used for ball-point pen point and smelting method thereof
  • Environment-friendly lead-free easy-cutting stainless steel used for ball-point pen point and smelting method thereof
  • Environment-friendly lead-free easy-cutting stainless steel used for ball-point pen point and smelting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Making AlBi master alloy:

[0025] Al and Bi fragments are added to the corundum crucible at a mass ratio of 9:1 and mixed evenly (the amount of Bi is added at 0.30% of the total amount, and the amount of AlBi master alloy added is 3%). Melt in the medium and stir evenly, and quickly pour it on the rotating red copper drum cooled by circulating water (200-300r / min) after being out of the furnace, so as to obtain a uniform, flake-shaped AlBi master alloy with a thickness of 1mm.

[0026] Vacuum induction and positive pressure melting:

[0027] Put the calculated and weighed metal chromium, silicon, manganese, molybdenum, nickel, iron sulfide, AlBi master alloy and pure iron into a 50Kg vacuum and positive pressure induction furnace for melting, in which the AlBi master alloy needs to be melted and refined before joining.

[0028] When refining, the power transmission power is 80-100KW, the vacuum degree is ≤1Pa, and the refining time is 15 minutes. After refining, clo...

Embodiment 2

[0032] The difference with Example 1 is:

[0033] The amount of Bi in stainless steel is added at 0.40%, and that of AlBi alloy is 4%. When the AlBi alloy is added after refining, the 50Kg vacuum and positive pressure induction furnace is filled with argon with a pressure of 0.8MPa. Sampling after casting the ingot for chemical analysis, its chemical composition is shown in Table 1, wherein the content of Bi is 0.292%, and the content of Pb is 0.002%, which is far less than the maximum lead content of 0.2% of the internationally recognized environmental protection pen tip material. After calculation, the yield of Bi was 73%.

Embodiment 3

[0035] The difference with Example 1 is:

[0036]The amount of Bi in stainless steel is added at 0.40%, and that of AlBi alloy is 4%. When AlBi alloy is added after refining, the pressure of argon gas in the 50Kg vacuum and positive pressure induction furnace is 1.0MPa. Sampling after casting the ingot for chemical analysis, its chemical composition is shown in Table 1, wherein the content of Bi is 0.324%, and the content of Pb is 0.003%, which is far less than the maximum lead content of 0.2% in internationally recognized environmentally friendly pen tip materials. After calculation, the yield of Bi was 81%.

[0037] Table 1 embodiment stainless steel chemical composition

[0038] C

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Abstract

The invention aims at providing environment-friendly lead-free easy-cutting stainless steel used for a ball-point pen point and a smelting method thereof. The stainless steel is characterized in thatthe stainless steel is ooCr22Mo2BiS stainless steel and comprises the components including, by mass, smaller than or equal to 0.03% of C, smaller than or equal to 2.0% of Mn, smaller than or equal to1.0% of Si, 21.0-23.0% of Cr, 1.0-3.0% of Mo,, smaller than or equal to 0.30% of Ni, 0.15-0.35% of Bi, 0.2-0.4% of S, smaller than or equal to 0.015% of P, smaller than or equal to 0.10% of Pb and thebalance Fe. According to the environment-friendly lead-free easy-cutting stainless steel used for the ball-point pen point, the Bi replaces Pb, an intermediate alloy is adopted for increasing the Bisteady yield, and accordingly, the environment-friendly lead-free easy-cutting stainless steel used for the ball-point pen point is prepared; and the smelting method of the stainless steel is easy, the preparation cost is low, and the smelting method is applicable to large-scale application and production.

Description

technical field [0001] The invention belongs to the field of alloys, and in particular provides an environmentally friendly free-cutting stainless steel for a lead-free ballpoint pen tip and a smelting method thereof. Background technique [0002] Common materials for ballpoint pen tips include leaded brass, nickel cupronickel, and free-machining stainless steel. Lead brass was first used, but due to its poor corrosion resistance and wear resistance, it was gradually replaced by nickel cupronickel, but the corrosion resistance of nickel cupronickel is still worse than that of stainless steel. At present, the United States, Japan, Europe, etc. generally use free-cutting stainless steel to make ballpoint pen heads, and free-cutting stainless steel has formed a standardized series of products. There are 9 kinds of free-cutting stainless steel in the American AISI standard, and 10 kinds of free-cutting stainless steel in the Japanese JIS standard. These countries have successi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C38/38C22C38/58C22C38/02C22C38/22C22C38/44C22C38/60C22C33/06
Inventor 都祥元郭诚陈雅文孔凡亚
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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