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A kind of steel for high-strength engineering machinery and its preparation method

A construction machinery, high-strength technology, applied in the field of high-strength construction machinery steel, can solve the problems of complex process control, high production cost, poor stability, etc., and achieve the effect of simple process control, low production cost and excellent performance

Inactive Publication Date: 2016-06-08
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Calcium treatment is required in the smelting process of this technology, and four-stage cooling is adopted after rolling, the process control is complicated and the stability is poor
[0006] In summary, it can be seen that the current production of high-strength construction machinery steel usually adds more alloying elements, and adopts rapid cooling + heat treatment process or four-stage cooling process after rolling, which is complicated in process and high in production cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A high-strength engineering machinery steel and a preparation method thereof. The preparation method is as follows: smelting and refining in a converter to form a billet; heating the billet at a heating temperature of 1150~1190°C; the starting temperature of rough rolling is 1100~1130°C, and the starting temperature of finishing rolling is 930~950°C , the final rolling temperature is 820~850°C; two-stage cooling method is adopted after rolling: the first stage cools to 720~750°C at a cooling rate of 3~5°C / s, and the second stage cools to 720~750°C at a cooling rate of 35~40°C / s Cooling speed Cool to 575~590°C; Air cool to room temperature after coiling.

[0016] The chemical composition and content of the slab described in this embodiment are: C is 0.06~0.08wt%, Mn is 1.40~1.45wt%, Si is 0.35~0.40wt%, P≤0.02wt%, S≤0.01wt% , Ti is 0.155~0.16wt%, Mo is 0.12~0.14wt%, Nb is 0.05~0.06wt%, and the rest is Fe and unavoidable impurities.

[0017] The mechanical properties of ...

Embodiment 2

[0019] A high-strength engineering machinery steel and a preparation method thereof. Its preparation method is: smelting and refining in a converter and then casting into a slab; heating the slab at a heating temperature of 1170~1210°C; the starting temperature of rough rolling is 1120~1150°C, and the starting temperature of finish rolling is 940~960°C , the final rolling temperature is 840~870°C; two-stage cooling method is adopted after rolling: the first stage cools to 735~760°C at a cooling rate of 4~5°C / s, and the second stage cools to 735~760°C at a cooling rate of 45~50°C / s Cooling speed Cool to 580~595°C; Air cool to room temperature after coiling.

[0020] The chemical composition and content of the slab described in this embodiment are: C is 0.08~0.10wt%, Mn is 1.35~1.45wt%, Si is 0.35~0.45wt%, P≤0.02wt%, S≤0.01wt% , Ti is 0.15~0.155wt%, Mo is 0.10~0.13wt%, Nb is 0.04~0.05wt%, and the rest is Fe and unavoidable impurities.

[0021] The mechanical properties of the ...

Embodiment 3

[0023] A high-strength engineering machinery steel and a preparation method thereof. The preparation method is as follows: smelting and refining in a converter to form a billet; heating the billet at a heating temperature of 1200~1250°C; the starting temperature of rough rolling is 1110~1140°C, and the starting temperature of finish rolling is 920~945°C , the final rolling temperature is 830~860°C; two-stage cooling method is adopted after rolling: the first stage cools to 720~745°C at a cooling rate of 3~4°C / s, and the second stage cools to 720~745°C at a cooling rate of 40~45°C / s The cooling speed is cooled to 560~580°C; air-cooled to room temperature after coiling.

[0024] The chemical composition and content of the slab described in this embodiment are: C is 0.07~0.09wt%, Mn is 1.45~1.55wt%, Si is 0.40~0.45wt%, P≤0.02wt%, S≤0.01wt% , Ti is 0.145~0.15wt%, Mo is 0.11~0.14wt%, Nb is 0.05~0.06wt%, and the rest is Fe and unavoidable impurities.

[0025] The mechanical proper...

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Abstract

The invention relates to high-strength steel for engineering machines and a preparation method of the high-strength steel. A technical scheme is as follows: the preparation method of the steel comprises the following steps: performing converter smelting and refining, and then performing continuous casting to form blanks; heating casting blanks under the condition that the heating temperature is 1150-1250 DEG C; performing rough rolling at rolling starting temperature of 1100-1150 DEG C, performing precision rolling at rolling starting temperature of 915-960 DEG C, and performing finishing rolling at temperature of 820-880 DEG C; cooling by adopting a two-section type cooling mode after rolling: cooling a first section to 720-760 DEG C at cooling speed of 3-6 DEG C / s, and cooling a second section to 560-600 DEG C at cooling speed of 30-50 DEG C / s; and coiling, and performing air cooling to room temperature. The casting blanks comprise the following chemical components in percentage by weight: 0.06-0.10wt% of C, 1.35-1.55wt% of Mn, 0.35-0.50wt% of Si, less than or equal to 0.02wt% of P, less than or equal to 0.01wt% of S, 0.14-0.16wt% of Ti, 0.10-0.15wt% of Mo, 0.04-0.06wt% of Nb and the balance of Fe and inevitable impurities. The preparation method disclosed by the invention has the characteristics of low production cost and simple process, and the prepared high-strength steel for the engineering machines is excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of steel for high-strength engineering machinery. In particular, it relates to a steel for high-strength engineering machinery and a preparation method thereof. Background technique [0002] With the development of large-scale and lightweight construction machinery, the requirements for the strength and toughness of construction machinery component materials are more prominent, which promotes the development and production of construction machinery steel to continuously develop towards higher strength levels and better comprehensive performance. . [0003] "Ultra-thick construction machinery steel with yield strength ≥ 550MPa and production method" (CN103540850A) patented technology, its chemical composition and content are: C is 0.07~0.11wt%, Mn is 1.35~1.60wt%, Si is 0.25~ 0.5wt%, Nb is 0.04~0.06wt%, Ti is 0.005~0.018wt%, P≤0.020wt%, S≤0.010wt%, Cr is 0.25~0.35wt%, B is 0.0008~0.0020wt%, and the rest are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/00
Inventor 徐光杨海林王敏胡海江周明星张益
Owner WUHAN UNIV OF SCI & TECH