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High-strength corrosion-resistant bolt and production process thereof

A production process and high-strength technology, applied in the direction of bolts, screws, nuts, etc., to achieve the effect of reasonable process steps, avoid thermal cracking, and increase strength

Pending Publication Date: 2022-03-15
苏州昭伍亿精密五金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The Chinese patent application number is CN201811037872.X, which discloses a production process of torsional shear bolts. By improving the structure of the equipment, the bolts are heated evenly, so as to improve the strength of the bolts. Improvement to improve the strength and corrosion resistance of bolts

Method used

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  • High-strength corrosion-resistant bolt and production process thereof
  • High-strength corrosion-resistant bolt and production process thereof

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Effect test

Embodiment 1

[0034] Described production process, comprises the following steps:

[0035] (1) Pretreatment: after surface cleaning, grinding and polishing of Ni, Cr, Nb, Mo, Ti, Al and Fe raw materials, they are cleaned with deionized water for many times, then ultrasonically cleaned with absolute ethanol, and dried Dry standby; Among them, the raw materials for making high-strength corrosion-resistant bolts include the following components in parts by weight: Ni 46%, Cr 17%, Nb 5%, Mo 2.5%, Ti 0.5%, Al 0.3%, C≦0.03% ,S≦0.01%, the rest is Fe;

[0036] (2) Smelting: put the Ti raw material after the above pretreatment into the crucible in the high vacuum electric arc furnace, put the Ni, Cr, Nb, Mo, Al, Fe raw materials after the above pretreatment into the crucible in the high vacuum electric arc furnace In other crucibles, the placement rules of Ni, Cr, Nb, Mo, Al, Fe raw materials are as follows: metal raw materials with high melting point are placed on the upper part of the crucible, a...

Embodiment 2

[0041] Described production process, comprises the following steps:

[0042] (1) Pretreatment: after surface cleaning, grinding and polishing of Ni, Cr, Nb, Mo, Ti, Al and Fe raw materials, they are cleaned with deionized water for many times, then ultrasonically cleaned with absolute ethanol, and dried Dry standby; Among them, the raw materials for making high-strength corrosion-resistant bolts include the following components in parts by weight: Ni 50%, Cr 16%, Nb 4%, Mo 2%, Ti 0.5%, Al 0.4%, C≦0.03% ,S≦0.01%, the rest is Fe;

[0043] (2) Smelting: put the Ti raw material after the above pretreatment into the crucible in the high vacuum electric arc furnace, put the Ni, Cr, Nb, Mo, Al, Fe raw materials after the above pretreatment into the crucible in the high vacuum electric arc furnace In other crucibles, the placement rules of Ni, Cr, Nb, Mo, Al, Fe raw materials are as follows: metal raw materials with high melting point are placed on the upper part of the crucible, and...

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Abstract

The invention discloses a high-strength corrosion-resistant bolt and a production process thereof. Raw materials for manufacturing the high-strength corrosion-resistant bolt comprise the following components in parts by weight: 45-50% of Ni, 16-18% of Cr, 4-5% of Nb, 2-3% of Mo, 0.5-0.8% of Ti, 0.2-0.4% of Al, less than or equal to 0.03% of C, less than or equal to 0.01% of S and the balance of Fe. According to the high-strength and corrosion-resistant bolt and the production process thereof, the formula design is reasonable, the high-strength and corrosion-resistant bolt is an alloy with Ni-Cr-Fe as a matrix and is composed of an austenite matrix phase gamma, a main strengthening phase gamma '', an auxiliary strengthening phase gamma ', a stable phase delta and a small amount of MC type carbide, the high-strength and corrosion-resistant bolt raw material is prepared, the process step design is reasonable, and the production cost is low. The high-strength corrosion-resistant bolt raw material is obtained through pretreatment, smelting, solution treatment and aging heat treatment, then the bolt raw material is processed, and the prepared bolt finished product has excellent strength and corrosion resistance and is wide in application prospect.

Description

technical field [0001] The invention belongs to the field of bolts, and in particular relates to a high-strength, corrosion-resistant bolt and a production process thereof. Background technique [0002] A bolt is a mechanical part, a cylindrical threaded fastener with a nut, a type of fastener consisting of a head and a screw (cylindrical body with external threads), which needs to be matched with a nut. It is used to fasten two parts with through holes. This connection form is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection. [0003] Bolts are very commonly used in mechanical processing and assembly. They have a wide range of applications and need to adapt to different environments. This requires bolts to have different properties, but high strength and wear resistance are indispensable properties for each bolt. In order to further enhance the strength and corrosion resistanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B33/00F16B35/00C22C19/05C22C30/00C22C1/02C22F1/10C22F1/00C22B9/20C21D9/00C21D1/18B21K1/44
CPCF16B33/008F16B35/00C22C19/056C22C30/00C22C1/023C22F1/10C22B9/20C21D9/0093C21D1/18C22F1/002
Inventor 李国良
Owner 苏州昭伍亿精密五金有限公司
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