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Manganese-molybdenum-vanadium steel material for high-strength bolt and preparation method of manganese-molybdenum-vanadium steel material

A technology of high-strength bolts and steel materials, applied in the field of high-strength fasteners, can solve the problems that plasticity cannot be adapted to cold drawing and cold heading processing, is difficult to achieve, and has a long cycle, so as to improve metal yield, increase strength and toughness , Improving the effect of billet quality

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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  • Manganese-molybdenum-vanadium steel material for high-strength bolt and preparation method of manganese-molybdenum-vanadium steel material
  • Manganese-molybdenum-vanadium steel material for high-strength bolt and preparation method of manganese-molybdenum-vanadium steel material
  • Manganese-molybdenum-vanadium steel material for high-strength bolt and preparation method of manganese-molybdenum-vanadium steel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A steel material for high-strength bolts of the present invention contains chemical element components and their mass percentages: carbon 0.44%, silicon 0.23%, manganese 1.56%, phosphorus 0.010%, sulfur 0.012%, molybdenum 0.43%, Nickel 0.25%, copper 0.24%, titanium 0.06%, boron 0.0022%, vanadium 0.20%, niobium 0.07%, aluminum 0.05%, and the balance is iron.

[0034] The preparation method includes the following steps:

[0035] (1) Add iron and steel to an oxygen top-blown converter for smelting. The carbon, nickel, copper, phosphorus, sulfur and iron elements are all derived from iron and steel. Before tapping, add ferro-aluminum and ferrosilicon to strongly deoxidize, and then add ferro-vanadium and ferromanganese. Continue to deoxidize with ferro-titanium smelting, then add ferro-boron to achieve partial alloying, and tap steel after smelting; the temperature of converter smelting is controlled at 1600℃~1660℃, and the temperature of tapping is controlled at 1580℃~1600℃;

[...

Embodiment 2

[0041] A steel material for high-strength bolts of the present invention contains chemical element components and their mass percentages: carbon 0.42%, silicon 0.20%, manganese 1.45%, phosphorus 0.009%, sulfur 0.014%, molybdenum 0.40%, Nickel 0.24%, copper 0.19%, titanium 0.09%, boron 0.0017%, vanadium 0.15%, niobium 0.09%, aluminum 0.04%, and the balance is iron.

[0042] The preparation method includes the following steps:

[0043] (1) Add iron and steel to the oxygen top-blown converter for smelting. The carbon, nickel, copper, phosphorus, sulfur and iron elements are all derived from iron and steel. Before tapping, add ferro-aluminum and ferrosilicon to strongly deoxidize, and then add ferro-vanadium and ferromanganese. Continue to deoxidize with ferro-titanium smelting, then add ferro-boron to achieve partial alloying, and tap steel after smelting; the temperature of converter smelting is controlled at 1600℃~1660℃, and the temperature of tapping is controlled at 1580℃~1600℃;

...

Embodiment 3

[0049] A steel material for high-strength bolts of the present invention contains chemical element components and their mass percentages: carbon 0.40%, silicon 0.25%, manganese 1.50%, phosphorus 0.011%, sulfur 0.010%, molybdenum 0.38%, Nickel 0.20%, copper 0.20%, titanium 0.08%, boron 0.0020%, vanadium 0.18%, niobium 0.08%, aluminum 0.07%, and the balance is iron.

[0050] The preparation method includes the following steps:

[0051] (1) Add iron and steel to the oxygen top-blown converter for smelting. The carbon, nickel, copper, phosphorus, sulfur and iron elements are all derived from iron and steel. Before tapping, add ferro-aluminum and ferrosilicon to strongly deoxidize, and then add ferro-vanadium and ferromanganese. Continue to deoxidize with ferro-titanium smelting, then add ferro-boron to achieve partial alloying, and tap steel after smelting; the temperature of converter smelting is controlled at 1600℃~1660℃, and the temperature of tapping is controlled at 1580℃~1600℃;

...

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Abstract

The invention discloses a manganese-molybdenum-vanadium steel material for a high-strength bolt. The manganese-molybdenum-vanadium 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, 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, 0.03-0.08% of aluminum and the balance iron. The manganese-molybdenum-vanadium 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 manganese-molybdenum-vanadium steel material. By adopting top-blown oxygen converter smelting and furnace external refining, with a continuous casting technology, the chemical components of the manganese-molybdenum-vanadium 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 particularly relates to a manganese-molybdenum-vanadium steel material 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 12.9 level. The current national standard GB / T3098.1 only stipulates the mechanical performance index of bolts of grade 12.9 and below, and does not require high-strength bolts of grade 12.9 or above; the performance of the fastener materials specified in the national standards GB / T6478 and GB / T3077 It can reach the level of 12.9, but cannot meet the performance requirements of the higher level of 14.9. At this stage, the materials and technology of high-strength bolts of grade 14.9 and higher in my country are still in a blank state. For example, the commonly used alloy steels 35CrMo and 42CrMo cannot take into account the comprehensive mecha...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/12C22C38/08C22C38/16C22C38/14C22C38/06C22C33/04C21D8/00C21C7/00
CPCC22C38/02C21C7/0006C21D8/005C22C33/04C22C38/002C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
Inventor 叶振宇
Owner 湖南铂固科技股份有限公司
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