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Alloy structural steel wire rod for shaft and preparation method thereof

A technology of alloy structural steel and structural steel, which is applied in the field of alloy structural steel wire rods for shafts and its preparation, can solve the problems of high surface quality requirements of raw materials, difficulties in alloy structural steel wire rods, and unusable hot-rolled wire rods, etc., to achieve The effects of shortening the annealing time, controlling the purity of molten steel, and reducing the annealing temperature

Active Publication Date: 2022-03-01
ZENITH STEEL GROUP CORP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Alloy structural steel for shafts is generally an important part with high strength and good plasticity, usually some quenched and tempered structural steel with large size and heavy load, and with the demand for some important parts with small size and special performance requirements The increase in the number and the continuous optimization of the processing technology of downstream users have brought certain difficulties to the alloy structural steel wire rod produced by the traditional technology, such as the small drawing allowance of the shaft and high requirements on the surface quality of the raw materials; in order to ensure the service life of the product, Strict requirements on gas and non-metallic inclusions
[0004] Due to the adjustment of the downstream user's processing technology, the hot-rolled wire rod cannot be used under the new technology

Method used

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  • Alloy structural steel wire rod for shaft and preparation method thereof
  • Alloy structural steel wire rod for shaft and preparation method thereof
  • Alloy structural steel wire rod for shaft and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Converter smelting

[0044] 15t of scrap steel and 5t of pig iron are added to the converter, and 120t of molten iron is added for smelting. [Si]: 0.52%, [P]: 0.06%, and [S]: 0.025% in molten iron. During the smelting process, argon is blown at the bottom for stirring. The converter smelting time 15min tapping, end point [C]: 0.12%, end point [P]: 0.011%, tapping temperature 1640°C, when tapping reaches 30t, start adding 120kg aluminum cake, 205kg ferrosilicon, 1305kg silicon manganese, 1830kg High-carbon ferrochrome, 1650kg nickel plate, 360kg ferromolybdenum, 250kg recarburizer, 500kg lime and 250kg slagging agent. When the steel is tapped to 90t, all the post-furnace feeding is completed. It is 5 minutes, and the argon gas in the ladle is adjusted in time after the tapping is completed to prevent the molten steel from being exposed.

[0045] (2) LF refining

[0046] The molten steel heats up rapidly after LF refining. During the heating process, the argon stirr...

Embodiment 2

[0058] In step (1), add 18t of steel scrap, 6t of pig iron, 115t of molten iron, [Si]: 0.65%, [P]: 0.04%, [S]: 0.020%, end point [C]: 0.10%, end point [P]: 0.009%, tapping temperature 1648°C;

[0059] In step (2), the temperature of molten steel rises to 1610°C, and the LF refining ends;

[0060] In step (3), 50m pure calcium wire is fed, the soft blowing time is 25min, and the soft blowing ends when the molten steel temperature reaches 1565°C;

[0061] In step (4), the continuous casting superheat is 25°C, and the casting speed is controlled at 0.90m / min;

[0062] All the other are identical with embodiment 1.

Embodiment 3

[0064] In step (7), the high temperature section of the intermediate billet is 1080-1120°C, the total heating time is 120min, the rolling start temperature is 980-1000°C, the first three heat preservation covers are opened, and the cover entry temperature is 760-780°C, and the rest are the same as in Example 2.

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Abstract

The invention belongs to the field of steel material preparation, and in particular relates to an alloy structural steel wire rod for shafts and a preparation method thereof. Its element composition by weight percentage is: C0.35%~0.44%, Si0.15%~0.37%, Mn0.50%~0.80%, Cr0.60%~0.90%, Ni1.25%~1.65%, Mo0 .15%~0.25%, P / S≤0.030%, Cu≤0.30%, and the rest are Al, Fe and unavoidable impurities. The preparation method includes converter smelting, LF external refining, RH vacuum degassing, bloom continuous casting, intermediate billet rolling, finishing and wire rod rolling. The prepared alloy structural steel wire rod has a uniform structure, and the softening annealing process can be used for wire rod drawing and cold heading processing, which solves the problem of poor uniform structure of the alloy structural steel wire rod for shafts, spheroidizing annealing must be used before drawing, and the quality is stable poor performance and other technical problems.

Description

technical field [0001] The invention belongs to the field of steel material preparation, and in particular relates to an alloy structural steel wire rod for shafts and a preparation method thereof. Background technique [0002] Alloy structural steel is a steel that is used as mechanical parts and various engineering components and contains one or several certain alloying elements. Because alloy structural steel has better mechanical properties than carbon steel, especially excellent heat treatment performance, it is widely used in ships, vehicles, aircraft, missiles, weapons, railways, bridges, pressure vessels, machine tools and other structures. [0003] Alloy structural steel for shafts is generally an important part with high strength and good plasticity, usually some quenched and tempered structural steel with large size and heavy load, and with the demand for some important parts with small size and special performance requirements The increase in the number and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/44C22C38/42C22C38/06C22C33/06C21D8/06
CPCC22C38/02C22C38/04C22C38/44C22C38/42C22C38/06C22C33/06C21D8/065
Inventor 屠兴圹苏振伟周淼王冬烨黄云飞高协清朱策左锦中林俊
Owner ZENITH STEEL GROUP CORP CO LTD
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