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Lead-free In-containing and Ta-containing bismuth bath alloy for troostite heat treatment

A troostite and alloy technology, applied in the field of bismuth bath alloys, can solve the problem of not fundamentally eliminating lead pollution, and achieve the effects of eliminating flux inclusions, low cost, excellent resistance to volatilization and oxidation

Inactive Publication Date: 2018-09-14
GUANGZHOU YUZHI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these two methods have not fundamentally eliminated the lead pollution problem encountered in the heat treatment process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A lead-free In and Ta bismuth bath alloy for heat treatment at 490°C using troostite. In terms of weight percentage, the chemical composition of the alloy is: Ba: 1.2wt.%, In: 0.3wt.%, Ta: 0.8wt.%, Sc: 0.5wt.%, Sm: 0.2wt.%, Co: 1.5wt .%, the balance is bismuth. The preparation method of the alloy: add the above-mentioned raw materials into the atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating to 700-800 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes; put the alloy The liquid is kept at 700-800 degrees for 10 minutes and then cast into the equipment at the same level as the hot top for semi-continuous casting into the required round ingot. The ingot moves down at a speed of 6m / min. The material is used for troostite heat treatment of iron and steel materials in a bismuth bath; wherein, the use temperature of the bismuth bath alloy is 480-550 degrees.

[0019] ...

Embodiment 2

[0021] A lead-free In and Ta bismuth bath alloy for heat treatment at 520°C using troostite. By weight percentage. In terms of weight percentage, the chemical composition of the alloy is: Ba: 1.4wt.%, In: 0.2wt.%, Ta: 0.9wt.%, Sc: 0.5wt.%, Sm: 0.2wt.%, Co: 1.6wt .%, the balance is bismuth. The preparation method of the alloy: add the above-mentioned raw materials into the atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating to 700-800 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes; put the alloy The liquid is kept at 700-800 degrees for 10 minutes and then cast into the equipment at the same level as the hot top for semi-continuous casting into the required round ingot. The ingot moves down at a speed of 8m / min. The material is used for troostite heat treatment of iron and steel materials in a bismuth bath; wherein, the use temperature of the bismuth bath alloy is 480-...

Embodiment 3

[0024] A lead-free In and Ta bismuth bath alloy for heat treatment at 540°C using troostite. By weight percentage. In terms of weight percentage, the chemical composition of the alloy is: Ba: 1.2wt.%, In: 0.4wt.%, Ta: 1.0wt.%, Sc: 0.5wt.%, Sm: 0.2wt.%, Co: 1.8wt .%, the balance is bismuth. The preparation method of the alloy: add the above-mentioned raw materials into the atmosphere-protected induction furnace, and use a silicon carbide crucible; induction heating to 700-800 degrees to form an alloy solution, and use the electromagnetic stirring effect to fully stir for about 10 minutes; put the alloy The liquid is kept at 700-800 degrees for 10 minutes and then cast into the equipment at the same level as the hot top for semi-continuous casting into the required round ingot. The ingot moves down at a speed of 8m / min. The material is used for troostite heat treatment of iron and steel materials in a bismuth bath; wherein, the use temperature of the bismuth bath alloy is 480-...

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Abstract

The invention discloses a lead-free In-containing and Ta-containing bismuth bath alloy for troostite heat treatment and a processing technology thereof. The lead-free In-containing and Ta-containing bismuth bath alloy comprises, by weight, 1.0-1.5% of Ba, 0.2-0.4% of In, 0.6-1.2% of Ta, 0.4-0.6% of Sc, 0.2-0.3% of Sm, 1.0-2.0% of Co, and the balance bismuth. The bismuth bath alloy is used for replacing a lead bath alloy for heat treatment, the contact between steel wires and the air is limited, and decarburization is prevented. Compared with an ordinary heating method, the hardness of the steel wire surface is improved, the possibility of crack formation and expansion is reduced, and the fatigue property of the steel wires is improved.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a bismuth bath alloy. Background technique [0002] The hot-rolled wire rod will produce large deformation during the drawing process, which will cause work hardening, resulting in uneven internal stress of the wire rod, and fracture in the subsequent deep processing process. The uniformity of the high-strength wire rod is the key factor affecting the subsequent processing of the wire rod. The higher the strength of the wire, the higher the requirement for its uniformity. Rope-making steel wire is made of hot-rolled wire rod through multi-pass drawing. In the process of steel wire drawing, in order to eliminate its work hardening, it is necessary to toughen the steel wire to transform it into a fine pearlite (sorbite) structure that is conducive to deep drawing, that is, the sorbite treatment of the steel wire. [0003] The traditional sorbite treatment of rope-making steel wire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C12/00C22C1/02C21D1/56C21D9/52
CPCC22C12/00C21D1/56C21D9/525C22C1/02
Inventor 杨长江
Owner GUANGZHOU YUZHI TECH CO LTD
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