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Preparation method for high-strength foundation bolt

An anchor bolt, high-strength technology, applied in the field of preparation of high-strength anchor bolts, can solve problems such as breakage or cracks, accident sources, easy rust and corrosion, etc., achieve good plasticity, improve tensile strength, and bolt precision high effect

Inactive Publication Date: 2013-07-17
繁昌县琪鑫铸造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the bolts are in a relatively humid environment, they are prone to rust and corrosion, eventually leading to breakage or cracks, forming a potential source of accidents

Method used

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Examples

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Embodiment Construction

[0020] The present invention will be further described in conjunction with the following examples:

[0021] The preparation method of high-strength anchor bolts, the processing steps include:

[0022] a. Casting rod material, in parts by weight, first put 11-14 parts of scrap steel into the intermediate frequency electric furnace to melt into molten steel, then add carburant, and then put in 30 - 35 parts of steel ingot, 30-35 parts of pig iron and 12-16 parts of returned material, at the same time, sprinkle a layer of thermal insulation covering agent on the surface of the melt to cover, then remove slag, add ferromanganese, ferrosilicon and other alloys after slag removal , when the temperature in the intermediate frequency electric furnace reaches 1450°C, pouring is carried out, and the weight percentage of each chemical composition of the control rod blank should meet the following requirements: C 0.27~0.36, Mn 0.25~0.33, V 0.05-0.08, Si 0.25 ~0.35, W 0.01-0.04, P≤0.025, ...

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PUM

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Abstract

The invention discloses a preparation method for a high-strength foundation bolt. Processing steps comprise a step of casting of a rod material, wherein chemical components of a rod material blank comprise, by weight, 0.27 to 0.36% of C, 0.25 to 0.33% of Mn, 0.05 to 0.08% of V, 0.25 to 0.35% of Si, 0.01 to 0.04% of W, no more than 0.025% of P, no more than 0.035% of S, 0.45 to 0.60% of Ni, 0.20 to 0.30% of Sn and 0.45 to 0.65% of Cu, with the balance being Fe. According to the invention, a cold extruding process is used for processing of the bolt, so strength of the bolt is improved, a hardness number and a strength value required by a 12.9 high-strength bolt are reached, the problems of delayed fracture and fatigue fracture of the bolt under high stress are overcome, and the bolt has reliable connection and hardly breaks during usage, has a prolonged service life and meets usage demands for high strength bolts by a variety of industries in society.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a preparation method of high-strength anchor bolts. Background technique [0002] Anchor bolts are commonly used fasteners in the machinery industry. The current processing method is generally turning and forming, and the strength is often difficult to guarantee. Sometimes unsafe phenomena such as U-turns and rod fractures occur during use, which is very harmful to industrial production. Therefore, it plays an important role in the development of technology and economy to study and improve the production method of high-strength bolts to ensure the quality stability of high-strength bolts. In addition, when the bolts are in a relatively humid environment, they are prone to rust and corrosion, eventually leading to breakage or cracks, forming a potential source of accidents. [0003] In view of this, it is necessary to provide a method for preparing anchor bolts to produce high-strength...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/16C21D1/18C21D9/00C23C8/66C23F17/00B23P15/00B21J5/06
Inventor 赵光明
Owner 繁昌县琪鑫铸造有限公司
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