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Round steel with excellent corrosion resistance and delayed fracture resistance for bolt and production method of round steel

A delayed fracture resistance and production method technology, which is applied in the field of steel for fasteners, can solve the problems of increased hydrogen-induced delayed fracture and unsatisfactory anti-corrosion effect, so as to reduce the amount of hydrogen, avoid the deterioration of delayed fracture resistance, and inhibit corrosion pits generated effect

Active Publication Date: 2020-09-04
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the disadvantages of the unsatisfactory anticorrosion effect when the existing high-strength bolts are protected by coating, and the problem of hydrogen-induced delayed fracture during the use of the bolts, and to provide a corrosion-resistant and delayed-fracture resistance. Round steel for bolts and production method thereof

Method used

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  • Round steel with excellent corrosion resistance and delayed fracture resistance for bolt and production method of round steel
  • Round steel with excellent corrosion resistance and delayed fracture resistance for bolt and production method of round steel
  • Round steel with excellent corrosion resistance and delayed fracture resistance for bolt and production method of round steel

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Effect test

Embodiment 1

[0049] The round steel for bolts with excellent corrosion resistance and delayed fracture resistance of this embodiment adopts the production process of the present invention, and its process parameters are: the pure degassing time is 20 minutes during the vacuum degassing of the RH furnace; During this time, the target temperature of molten steel in the tundish is stably controlled at 15°C above the liquidus temperature; the heating temperature is 950°C when the high-quality bar heating furnace is heated, and the billet stays in the furnace for 140 minutes; the starting temperature of the round steel is 910°C, and the final The rolling temperature was 780°C. When the round steel is inspected for mechanical properties, its heating temperature is 900°C when it is quenched and heated in the heat treatment process, and its tempering temperature is 580°C when it is tempered at a high temperature.

[0050] The chemical composition and content that present embodiment adopts see fig...

Embodiment 2

[0052] The round steel for bolts with excellent corrosion resistance and delayed fracture resistance of this embodiment adopts the production process of the present invention, and its process parameters are: the pure degassing time is 20 minutes during the vacuum degassing of the RH furnace; The target temperature of molten steel in the tundish is stably controlled at 20°C above the liquidus temperature; when the heating furnace is heated, the heating temperature is 1000°C, and the billet stays in the furnace for 170 minutes; the starting rolling temperature of the round steel is 920°C, and the finishing rolling temperature is It is 840°C. When the round steel is inspected for mechanical properties, its heating temperature is 920° C. when it is quenched and heated in the heat treatment process, and its tempering temperature is 600° C. when it is tempered at a high temperature.

[0053] The chemical composition and content that present embodiment adopts see figure 1 , the test...

Embodiment 3

[0055] The round steel for bolts with excellent corrosion resistance and delayed fracture resistance of this embodiment adopts the production process of the present invention, and its process parameters are: the pure degassing time is 20 minutes during the vacuum degassing of the RH furnace; The target temperature of molten steel in the tundish is stably controlled at 18°C ​​above the liquidus temperature; when the heating furnace is heated, the heating temperature is 960°C, and the billet stays in the furnace for 150 minutes; the starting rolling temperature of the round steel is 890°C, and the finishing rolling temperature is is 800°C. When the round steel is inspected for mechanical properties, its heating temperature is 910°C when it is quenched and heated in the heat treatment process, and its tempering temperature is 600°C when it is tempered at a high temperature.

[0056] The chemical composition and content that present embodiment adopts see figure 1 , the test resul...

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Abstract

The invention discloses round steel with excellent corrosion resistance and delayed fracture resistance for a bolt and a production method of the round steel, and belongs to the technical field of steel for fasteners. The round steel with excellent corrosion resistance and delayed fracture resistance for the bolt comprises the following chemical components of, by weight, 0.55%-0.60% of C, 1.80%-2.00% of Si, 0.10%-0.20% of V, 0.05%-0.15% of Nb, 0.25%-0.35% of Mn, 1.05%-1.35% of Cr, 1.50%-1.80% of Mo, 0.10%-0.30% of Ni, 0.20%-0.35% of Cu, 0.015%-0.040% of Als, less than or equal to 0.010% of P,less than or equal to 0.010% of S, less than or equal to 0.00015% of H, less than or equal to 0.0010% of O, less than or equal to 0.005% of N, and the balance Fe and other inevitable impurities. By adopting the technical scheme, the problems can be effectively solved, the excellent corrosion resistance and delayed fracture resistance are achieved, and the performance requirement of the high-stressfastener of an automobile engine can be met.

Description

technical field [0001] The invention belongs to the technical field of steel for fasteners, and in particular relates to round steel for bolts with excellent corrosion resistance and delayed fracture resistance and a production method thereof. Background technique [0002] Fasteners are the basic industry of my country's equipment manufacturing industry and are widely used in various fields of the national economy. In recent years, with the rapid development of various industries such as automobiles, wind power, machinery, and construction in my country, the design stress and lightweight requirements for the materials used in the manufacture of various fasteners (such as bolts, nuts, etc.) have been put forward. An effective measure is to increase the strength of the fastener. The lightweight of the car body is to improve the fuel efficiency of the car and reduce the CO 2 One of the effective methods of emission, due to the small and lightweight requirements of the engine a...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/06C22C38/34C22C38/42C22C38/44C22C38/46C22C38/48C21D8/06C21D1/18C21C7/10
CPCC22C38/34C22C38/46C22C38/48C22C38/04C22C38/44C22C38/42C22C38/06C22C38/002C22C38/001C21D1/18C21D8/065C21C7/10
Inventor 尹德福汪开忠张晓瑞龚梦强胡芳忠于同仁丁雷姜婷牟祖茂孙凯
Owner MAANSHAN IRON & STEEL CO LTD
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