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Method for producing special fastener

A production method and fastener technology, which is applied in the production field of special fasteners, can solve the problems that the production process of fasteners cannot meet the requirements, etc., and achieve the effect of strengthening comprehensive performance and increasing corrosion resistance

Inactive Publication Date: 2008-09-24
浙江高强度紧固件有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the application of special fasteners in the above-mentioned special fields and environments requires the technology of high-strength fasteners that are resistant to deep-sea low-temperature environments, various salt corrosion, H2S stress corrosion cracking, and performance grades greater than or equal to 8.8. conditions, and to obtain special fasteners with the above performance parameters, the existing fastener production process cannot meet the requirements

Method used

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  • Method for producing special fastener
  • Method for producing special fastener
  • Method for producing special fastener

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Experimental program
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Effect test

Embodiment 1

[0039] see figure 1 As shown in the process flow, the present invention mainly includes blank preparation-heat treatment process-surface treatment process-inspection storage, specifically as follows:

[0040] Using domestic 42CrMoA as the raw material, the deep-sea fastener blanks are prepared through raw material inspection, punching, forging, lathe plane chamfering, turning the outer diameter of the thread blank, thread rolling machine rolling, and the blank before quenching The surface of the workpiece is machined to prevent decarburization of the workpiece, so that the surface of the blank is kept bright, and then the quenching test is carried out, and the quenching crack is inspected by the naked eye, and the metallographic inspection is performed regularly to correct the furnace temperature, and then the prepared fastener blank is In the continuous controllable atmosphere tempering quenching furnace, brine is used as the quenching medium, and under the protection of met...

Embodiment 2

[0042] The technical process of this embodiment is the same as that of Embodiment 1, except that water is used as the quenching medium, and the quenching and holding time is 60 minutes.

Embodiment 3

[0044] The technical process of this embodiment is the same as that of Embodiment 1, except that oil is used as the quenching medium, and the quenching and holding time is 120 minutes.

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Abstract

The invention discloses a fabrication method of special fastener, comprising a blank preparation, a heat treatment technology, a surface treatment technology and inspection of finish product. The invention utilizes 42CrMoA which is made in China as raw material, adopts a controllable atmosphere quenching furnace, and obtains the ideal temperature and time of quenching and tempering in heat treatment technology via massive theory instruction and test data. By strictly controlling the temperature and the time as well as carrying out the qualitative investigation of metallography and the test of entire mechanical performance, the invention can greatly strengthen the comprehensive performance of material and promote the corrosion resistance of products by coordinating with the special surface treatment technology. By examined, the special fastener which is prepared by using the invention can have the mechanical performance of 8.8 / 8 levels and above, the impact energy of the low temperature impact property of more than 40 Joule at minus 101 DEG C, the salt spray resistance of more than 4000 hours, and has the advantages of the high strength, the low temperature resistance and the corrosion resistance.

Description

technical field [0001] The invention relates to a production process of a fastener, in particular to a production method of a special fastener with high strength, low temperature resistance and corrosion resistance. Background technique [0002] Fasteners (bolts, screws, nuts) used in deep sea development, petrochemical industry, chemical industry, shipbuilding industry, nuclear power industry, aerospace industry and equipment matching and pipeline installation in special environments, such as low temperature in special environments 1. Salts have serious corrosion on metals, construction projects are costly and difficult to maintain. At this time, fasteners are required to have strong corrosion resistance and low temperature resistance on the basis of ensuring mechanical properties to prolong their service life and reduce Maintenance costs, which place high demands on the fasteners. Therefore, the application of special fasteners in the above-mentioned special fields and en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18
Inventor 葛海泉俞文龙冯永亮葛少辉秦保成戴建海陈兴娄勤松樊越峰加世明
Owner 浙江高强度紧固件有限公司
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