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High-strength bolt alloy material resistant to delayed fracture and manufacturing method of bolt

A technology of high-strength bolts and alloy materials, which is applied in the manufacture of bolts and the field of high-strength bolt alloy materials. It can solve the problems that the delayed fracture of bolts cannot be improved, and achieve improved corrosion resistance and surface finish, good resistance to delayed fracture, and enhanced The effect of mechanical properties

Active Publication Date: 2017-03-22
NINGBO ZHENHAI YONGDING FASTENER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alloy steel disclosed in this application can improve the strength of the bolt to a certain extent, but it cannot improve the delayed fracture of the bolt

Method used

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  • High-strength bolt alloy material resistant to delayed fracture and manufacturing method of bolt
  • High-strength bolt alloy material resistant to delayed fracture and manufacturing method of bolt
  • High-strength bolt alloy material resistant to delayed fracture and manufacturing method of bolt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The bolt alloy material of the present embodiment includes the following chemical composition in weight percentage: C 0.4%, Si 0.2%, Mn 0.05%, P 0.01%, S 0.02%, Cu 0.1%, Co 0.25%, Ni 0.24%, Al 0.24% , Ti 0.18%, Mo 0.18%, V 0.1%, Sm 0.08%, Te 0.04%, NdFeB 0.08%, and the balance is iron and unavoidable impurity elements.

[0046] Adopt the manufacturing method of the bolt of the bolt alloy material of the present embodiment, comprise following 9 processing steps:

[0047] (1) Cast rod material; control the chemical composition of the rod material according to the above-mentioned ratio to make a rod material blank, and cast the rod material blank, wherein the temperature of the cast blank is reduced to 300 ° C, and then the temperature is reduced to 25 ° C / hour Heating at a heating rate of 600°C, holding for 2 hours, cooling to 300°C at a cooling rate of 30°C / hour, and completing a temperature control stage, then repeating the above temperature control stage twice, cooli...

Embodiment 2

[0060] The bolt alloy material of the present embodiment includes the following chemical composition in weight percentage: C 0.45%, Si0.15%, Mn 0.05%, P 0.015%, S 0.03%, Cu 0.13%, Co 0.27%, Ni 0.25, Al 0.21% , Ti0.2%, Mo 0.22%, V 0.14%, Sm 0.09%, Te 0.05%, NdFeB 0.12%, and the balance is iron and unavoidable impurity elements.

[0061] Adopt the manufacturing method of the bolt of the bolt alloy material of the present embodiment, comprise following 9 processing steps:

[0062] (1) Cast rod material; control the chemical composition of the rod material according to the above-mentioned ratio to make a rod material blank, and cast the rod material blank, wherein the temperature of the cast blank is reduced to 300 ° C, and then the temperature is reduced to 25 ° C / hour Heating rate to 700°C, holding temperature for 1.5 hours, cooling to 300°C at a cooling rate of 30°C / hour, and completing a temperature control stage, then repeating the above temperature control stage twice, coo...

Embodiment 3

[0075] The bolt alloy material of the present embodiment includes the following chemical composition in weight percentage: C 0.35%, Si0.12%, Mn 0.05%, P 0.02%, S 0.04%, Cu 0.3%, Co 0.30%, Ni 0.25, Al 0.1% , Ti0.18%, Mo 0.22%, V 0.12%, Sm 0.11%, Te 0.05%, NdFeB 0.13%, the balance is iron and unavoidable impurity elements.

[0076] Adopt the manufacturing method of the bolt of the bolt alloy material of the present embodiment, comprise following 9 processing steps:

[0077] (1) Cast rod material; control the chemical composition of the rod material according to the above-mentioned ratio to make a rod material blank, and cast the rod material blank, wherein the temperature of the cast blank is reduced to 300 ° C, and then the temperature is reduced to 25 ° C / hour Heat up to 680°C at a heating rate, hold for 2 hours, cool to 300°C at a cooling rate of 30°C / hour, and complete the temperature control stage once, then repeat the above temperature control stage twice, cool to room t...

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Abstract

The invention relates to a delayed-fracture-resistant high-strength bolt alloy material and a manufacturing method of bolts. The bolt alloy material comprises, by weight, 0.2%-0.5% of C, 0.05%-0.5% of Si, 0.03%-0.08% of Mn, 0.01%-0.02% of P, 0.02%-0.04% of S, 0.1%-0.16% of Cu, 0.24%-0.32% of Co, 0.22%-0.28% of Ni, 0.08%-0.24% of Al, 0.12%-0.26% of Ti, 0.14%-0.29% of Mo, 0.1%-0.15% of V, 0.08%-0.14% of Sm, 0.04%-0.06% of Te, 0.08%-0.14% of neodymium iron boron and the balance Fe and impurity elements. The bolt alloy material is high in strength and good in delayed fracture resistance.

Description

technical field [0001] The invention relates to a bolt alloy material, in particular to a high-strength bolt alloy material resistant to delayed fracture; the invention also relates to a bolt manufacturing method. Background technique [0002] Fasteners play the role of connection, positioning and sealing in mechanical components, among which bolts are used the most. With the continuous enlargement of various types of machinery, equipment, and construction projects, as well as the continuous increase in power and speed, the working conditions of bolt parts have become more severe and the working stress has increased significantly. Therefore, bolt steel is required to have higher strength. For example, high-strength bolts are used in engineering, aircraft, trams, automobiles, and bridges; The bolt is an important part used in the bolt ball joint of the space steel grid. It directly transmits the alternating internal force caused by the alternating load, and its quality direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/60C23F17/00
Inventor 潘剑波
Owner NINGBO ZHENHAI YONGDING FASTENER
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