High-strength bolt and processing method thereof

A technology of high-strength bolts and processing methods, applied in the direction of screws, threaded fasteners, connecting components, etc., can solve the problems of plasticity and toughness that cannot reach high-strength bolts, and improve cold working performance, long service life, plasticity and toughness. Good results

Inactive Publication Date: 2013-02-27
谢亚平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this processing method can be used to produce high-strength bolts with strength and hardness reaching 12.9 and 14.9 grades, its plasticity and toughness still cannot meet the requirements of high-strength bolts.

Method used

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  • High-strength bolt and processing method thereof
  • High-strength bolt and processing method thereof
  • High-strength bolt and processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The high-strength bolt steel of Example 1 in Table 1 is selected for its chemical composition and mass percentage ratio. First, it is subjected to spheroidizing annealing treatment, pickling and derusting before being put into the furnace, and then enters the spheroidizing furnace. In order to avoid decarburization after spheroidizing annealing , the raw material is cooled slowly after 760°C and uniform temperature for 6 hours, then cut the raw material to the length required by the bolt, put the raw material into the mold cavity in the cold state, and cold extrude the raw material to form the head required by the bolt The cold-headed extruded bolt rough product of the head and rod; the above-mentioned cold-headed bolt rough product is quenched with quenching oil in a continuous heat treatment furnace at a temperature of 950 ° C, the holding time is 80 minutes, and then tempered at 550 ° C Treatment, holding time 2.5 hours; through quenching and tempering treatment, the b...

Embodiment 2

[0041] The high-strength bolt steel of Example 2 in Table 1 is selected for its chemical composition and mass percentage distribution ratio, and is first subjected to spheroidizing annealing treatment, pickling and rust removal before being put into the furnace, and then enters the spheroidizing furnace, in order to avoid decarburization after spheroidizing annealing , the raw material is cooled slowly after 780°C and uniform temperature for 5 hours, then cut the raw material to the length required by the bolt, put the raw material into the mold cavity in the cold state, and cold extrude the raw material to form the head required by the bolt Cold-headed extruded rough bolts at the head and shank; the above-mentioned cold-headed rough bolts are quenched with quenching oil in a continuous heat treatment furnace at a temperature of 940 ° C, the holding time is 100 minutes, and then tempered at 600 ° C Treatment, heat preservation time for 2 hours; through quenching and tempering t...

Embodiment 3

[0044] The high-strength bolt steel of Example 3 in Table 1 is selected for its chemical composition and mass percentage ratio. First, it undergoes spheroidizing annealing treatment, pickling and rust removal before entering the furnace, and then enters the spheroidizing furnace. In order to avoid decarburization after spheroidizing annealing , the raw material is cooled slowly after 750°C and uniform temperature for 8 hours, then cut the raw material to the length required by the bolt, put the raw material into the mold cavity in the cold state, and cold extrude the raw material to form the head required by the bolt Cold-headed extruded rough bolts at the head and shank; the above-mentioned cold-headed rough bolts are quenched with quenching oil in a continuous heat treatment furnace at a temperature of 980°C, the holding time is 60 minutes, and then tempered at 580°C Treatment, heat preservation time for 2 hours; through quenching and tempering treatment, the bolts can reach ...

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Abstract

The invention belongs to the technical field of bolt processing and relates to a high-strength bolt and a processing method thereof. The high-strength bolt solves the problem that the present bolt is low in strength and hardness. The high-strength bolt is formed by processing the high-strength bolt steel, wherein the high-strength bolt steel comprises the following chemical components by mass percent: 0.38%-0.45% of C, 0.15%-0.25% of Mn, 0.8%-1.2% of Cr, 1.1%-1.4% of Mo, 0.05%-0.15% of Si, less than 0.001% of S, less than 0.004% of P, 0.4%-0.6% of V, 0.01-0.05% of Nb and the balance of Fe. The high-strength bolt has the advantages of high strength and hardness.

Description

technical field [0001] The invention relates to a bolt and a processing method thereof, in particular to a high-strength bolt and a processing method thereof, and belongs to the technical field of bolt processing. Background technique [0002] Bolt is a very widely used accessory, which is inseparable from aerospace to daily life. According to different strengths, bolts can be divided into ordinary bolts and high-strength bolts. Compared with ordinary bolts, high-strength bolts have many advantages: shorter on-site assembly time, less impact on production, long service life, wide range of applicable components, safe and reliable connections, and better manufacturability and economy. It is precisely because of these advantages of high-strength bolts that industrially developed countries have concentrated research on high-strength bolt steel and high-strength bolts in recent years, and developed a series of ultra-high-strength bolt steel and ultra-high-strength bolts. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C23F17/00F16B35/00
Inventor 谢亚平
Owner 谢亚平
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