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Preparation method of high-strength corrosion-resistant bolts

A corrosion-resistant and high-strength technology, applied in the field of high-strength corrosion-resistant bolts, can solve the problems of easy rust, corrosion, fracture or crack, formation of accident sources, etc.

Active Publication Date: 2016-05-11
国动科技有限公司
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  • Abstract
  • Description
  • Claims
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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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  • Preparation method of high-strength corrosion-resistant bolts

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Embodiment Construction

[0016] The present invention will be further described in conjunction with the following examples:

[0017] A method for preparing a high-strength corrosion-resistant bolt, the processing steps comprising:

[0018] a. Casting rod material, control its chemical composition percentage as follows: C0.4-0.8%, Si0.02-0.05%, Mn0.18-0.21%, P0.16-0.18%, S0.05-0.07%, Cr0 .05-0.15%, Ti0.05-0.12%, Cu0.11-0.13%, Al0.01-0.02%, Mg0.02-0.03%, the balance is iron;

[0019] b. The rod material after casting is pickled; according to the wire diameter requirements of the bolt, it is drawn to make the rod material shrink to the wire diameter required by the bolt; the rod material after shrinking the wire diameter Cut to the length required by the bolt, put the cut rod material into the mold cavity at room temperature, and use the upsetting force to make the rod material form the head and rod size required by the bolt; finally pass through the reciprocating thread rolling machine The two tooth p...

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Abstract

The invention discloses a preparation method of a high-strength anti-corrosion bolt. The preparation method comprises the following processing steps of: a, casting a rod material which comprises the following chemical components according percentage composition: 0.4%-0.8% of C, 0.02%-0.05% of Si, 0.18%-0.21% of Mn, 0.16%-0.18% of P, 0.05%-0.07% of S, 0.05%-0.15% of Cr, 0.05%-0.12% of Ti, 0.11%-0.13% of Cu, 0.01%-0.02% of Al, 0.02%-0.03% of Mg, and the balance of iron; b, performing acid pickling on the casted rod material, performing wire drawing on the rod material according to the wire diameter requirement of the bolt so as to shrink the rod material to the wire diameter required for the bolt, cutting the rod material with the shrunk wire diameter to a length required for the bolt, placing the cut rod material in a die cavity at a normal temperature, and shaping the rod material to be in the size of the head part and the rod part required for the bolt through forging force. By processing the bolt through the cold extrusion process, the preparation method of the high-strength anti-corrosion bolt provided by the invention has the effects of improving the strength of the bolt, ensuring that the hardness value and the strength value required for a 12.9 high-strength bolt are achieved, and solving the problems of delay fracture and fatigue fracture of the bolt under high strength; and the bolt is reliable for connection and less prone to breaking in use, the service life of the bolt is prolonged, and thus the use requirement on high-strength bolts in various industries in society is satisfied.

Description

technical field [0001] The invention relates to a bolt processing method, in particular to a preparation method of a high-strength corrosion-resistant bolt. Background technique [0002] High-strength 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-turn and rod breakage 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 processing method for high-strength bol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C21D9/00C23C22/13C23C22/62B23P13/00
Inventor 王立新
Owner 国动科技有限公司
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