Vanadium-titanium-boron steel material for high-strength bolt and preparation method of vanadium-titanium-boron steel material

A technology of high-strength bolts and steel materials, applied in the manufacture of converters and other directions, can solve the problems of long cycle, high energy consumption, difficult to achieve, etc., to improve metal yield and quality of cast slabs, good workability and hardenability properties, and the effect of improving strength and toughness

Inactive Publication Date: 2018-06-01
湖南铂固科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, cold drawing and cold heading require high-strength 14.9 grade bolt materials to have excellent processing properties, but the existing bolt steel materials are difficult to meet this requirement
At this stage, the materials used to process bolts generally have plasticity and cannot adapt to cold drawing and cold heading processing. Intermediate heat treatment must be carried out to restore plasticity. There are many processes, high energy consumption, and long cycle time.

Method used

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  • Vanadium-titanium-boron steel material for high-strength bolt and preparation method of vanadium-titanium-boron steel material
  • Vanadium-titanium-boron steel material for high-strength bolt and preparation method of vanadium-titanium-boron steel material
  • Vanadium-titanium-boron steel material for high-strength bolt and preparation method of vanadium-titanium-boron steel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A vanadium-titanium-boron iron and steel material used for high-strength bolts of the present invention, the chemical element composition and mass percentages thereof include: 0.46% carbon, 0.20% silicon, 1.55% manganese, 0.007% phosphorus, 0.005% sulfur, molybdenum 0.44%, chromium 1.37%, nickel 0.24%, copper 0.20%, titanium 0.09%, boron 0.0020%, vanadium 0.20%, niobium 0.09%, and the balance is iron.

[0035] Its preparation method comprises the following steps:

[0036] (1) Steel is smelted in an oxygen top-blown converter. Carbon, nickel, copper, phosphorus, sulfur and iron are all derived from steel. Ferrosilicon is added for strong deoxidation before tapping, and ferrovanadium, ferromanganese and ferrotitanium are added. The smelting continues to deoxidize, and then ferroboron is added to achieve partial alloying, and the steel is tapped after the smelting is completed; the temperature of the converter smelting is controlled at 1600 ° C ~ 1660 ° C, and the temperat...

Embodiment 2

[0042] A vanadium-titanium-boron iron and steel material for high-strength bolts of the present invention, the chemical element composition and mass percentages thereof include: 0.42% carbon, 0.15% silicon, 1.48% manganese, 0.008% phosphorus, 0.007% sulfur, molybdenum 0.43%, chromium 1.31%, nickel 0.23%, copper 0.21%, titanium 0.06%, boron 0.0018%, vanadium 0.18%, niobium 0.07%, and the balance is iron.

[0043] Its preparation method comprises the following steps:

[0044] (1) Steel is smelted in an oxygen top-blown converter. Carbon, nickel, copper, phosphorus, sulfur and iron are all derived from steel. Ferrosilicon is added for strong deoxidation before tapping, and ferrovanadium, ferromanganese and ferrotitanium are added. The smelting continues to deoxidize, and then ferroboron is added to achieve partial alloying, and the steel is tapped after the smelting is completed; the temperature of the converter smelting is controlled at 1600 ° C ~ 1660 ° C, and the temperature o...

Embodiment 3

[0050] A vanadium-titanium-boron iron and steel material for high-strength bolts of the present invention, the chemical element composition and mass percentages thereof include: 0.39% carbon, 0.18% silicon, 1.52% manganese, 0.006% phosphorus, 0.005% sulfur, molybdenum 0.42%, chromium 1.35%, nickel 0.20%, copper 0.25%, titanium 0.08%, boron 0.0016%, vanadium 0.16%, niobium 0.08%, and the balance is iron.

[0051] Its preparation method comprises the following steps:

[0052] (1) Steel is smelted in an oxygen top-blown converter. Carbon, nickel, copper, phosphorus, sulfur and iron are all derived from steel. Ferrosilicon is added for strong deoxidation before tapping, and ferrovanadium, ferromanganese and ferrotitanium are added. The smelting continues to deoxidize, and then ferroboron is added to achieve partial alloying, and the steel is tapped after the smelting is completed; the temperature of the converter smelting is controlled at 1600 ° C ~ 1660 ° C, and the temperature o...

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Abstract

The invention discloses a vanadium-titanium-boron steel material for a high-strength bolt. The vanadium-titanium-boron steel material comprises the following chemical element components of, by mass percent, 0.39-0.46% of carbon, 0.15-0.30% of silicon, 1.45-1.60% of manganese, less than or equal to 0.015% of phosphorus, less than or equal to 0.015% of sulfur, 0.35-0.45% of molybdenum, 1.25-1.40% ofchromium, less than or equal to 0.25% of nickel, less than or equal to 0.25% of copper, 0.04-0.10% of titanium, 0.0005-0.0025% of boron, 0.15-0.30% of vanadium, 0.05-0.10% of niobium and the balanceiron. The vanadium-titanium-boron steel material has good machinability and hardenability, various elements act synergistically, and the strength and toughness of steel can be improved effectively. The invention also discloses a preparation method of the vanadium-titanium-boron steel material. By adopting top-blown oxygen converter smelting and furnace external refining, with a continuous castingtechnology, the chemical components of the vanadium-titanium-boron steel material can be controlled within the ranges of design.

Description

technical field [0001] The invention belongs to the technical field of high-strength fasteners, and in particular relates to a vanadium-titanium-boron steel material used for high-strength bolts and a preparation method thereof. Background technique [0002] At present, my country's high-strength bolt manufacturing technology stays at the level of 12.9. The current national standard GB / T3098.1 only stipulates the mechanical performance indicators of bolts with grades 12.9 and below, and has no requirements for high-strength bolts above grade 12.9; the fastener materials specified in the national standards GB / T6478 and GB / T3077 have properties Level 12.9 can be achieved, but not the performance requirements of the higher level 14.9. At present, the materials and technology of high-strength bolts of grade 14.9 and higher in our country are still in a blank state. For example, the commonly used alloy steels 35CrMo and 42CrMo cannot take into account the comprehensive mechanic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C38/50C22C38/54C22C38/46C22C38/48C22C38/20C22C38/28C22C38/32C22C38/24C22C38/26C22C33/04B22D11/00C21C5/32C21C7/06C21C7/00
CPCC22C38/42B22D11/001C21C5/32C21C7/0006C21C7/06C22C33/04C22C38/20C22C38/24C22C38/26C22C38/28C22C38/32C22C38/46C22C38/48C22C38/50C22C38/54
Inventor 叶振宇
Owner 湖南铂固科技股份有限公司
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