High-strength high-toughness high-carbon bainite steel and preparation method thereof

A technology of high carbon bainite steel and carbon bainite steel, which is applied in the field of material preparation, can solve the problems of complex production process, increase production cost, high requirements on equipment and process conditions, etc., achieve simple process, improve strength and toughness, The effect of excellent strength and toughness

Inactive Publication Date: 2019-06-25
JILIN AGRI SCI & TECH COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of these two methods is relatively complicated, and the requirements for equipment and process conditions are relatively high, especially the isothermal transformation time of bainite is too long, and a variety of alloying elements are added, which increases the production cost

Method used

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  • High-strength high-toughness high-carbon bainite steel and preparation method thereof
  • High-strength high-toughness high-carbon bainite steel and preparation method thereof
  • High-strength high-toughness high-carbon bainite steel and preparation method thereof

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preparation example Construction

[0023] A kind of preparation method of high-strength high-toughness high-carbon bainite steel of the present invention comprises the following steps:

[0024] In terms of percentage, the high carbon bainite steel contains the following chemical composition: C: 0.6%-0.9%; Si: 1.5-2.5%; Mn: 1.5%-2.5%; Cr: 0.5-1.5%; Mo: 0.1 -0.3%; the rest is Fe and unavoidable impurity elements;

[0025] S1. According to the chemical composition described in claim 1, the cast billet of alloy steel is obtained by vacuum smelting, and then the cast billet is hot-rolled into a forging billet of the required size, without high-temperature annealing, directly heated at 1150-1250 °C , take out after 1-2h soaking and heat preservation, hot rolling, and cool in the air;

[0026] S2. Austempering heat treatment process:

[0027] The first step: directly heat the rolled steel billet to 900-950°C, and keep it warm for 0.5-1.5h to make the whole structure austenitized; the second step: heat the austenitiz...

Embodiment 1

[0030] A method for preparing high-strength and high-toughness high-carbon bainitic steel, the high-carbon bainitic steel contains the following chemical components: C: 0.6%-0.9%; Si: 1.5-2.5%; Mn: 1.5%-2.5% %; Cr: 0.5-1.5%; Mo: 0.1-0.3%; the rest is Fe and unavoidable impurity elements;

[0031] S1. According to the chemical composition described in claim 1, the cast billet of alloy steel is obtained by vacuum smelting, and then the cast billet is hot-rolled into a forging billet of the required size, without high-temperature annealing, directly heated at 1150-1250 °C , take out after 1-2h soaking and heat preservation, hot rolling, and cool in the air;

[0032] S2. Austempering heat treatment process:

[0033] The first step: directly heat the rolled steel billet to 900-950°C, and keep it warm for 0.5-1.5h to make the whole structure austenitized; the second step: heat the austenitized bainite steel with 10 The cooling rate of -20°C / s is reduced to 200-220°C, placed in a s...

Embodiment 2

[0036] A method for preparing high-strength and high-toughness high-carbon bainitic steel, the high-carbon bainitic steel contains the following chemical components: C: 0.6%-0.9%; Si: 1.5-2.5%; Mn: 1.5%-2.5% %; Cr: 0.5-1.5%; Mo: 0.1-0.3%; the rest is Fe and unavoidable impurity elements;

[0037] S1. According to the chemical composition described in claim 1, the cast billet of alloy steel is obtained by vacuum smelting, and then the cast billet is hot-rolled into a forging billet of the required size, without high-temperature annealing, directly heated at 1150-1250 °C , take out after 1-2h soaking and heat preservation, hot rolling, and cool in the air;

[0038] S2. Austempering heat treatment process:

[0039] The first step: directly heat the rolled steel billet to 900-950°C, and keep it warm for 0.5-1.5h to make the whole structure austenitized; the second step: heat the austenitized bainite steel with 10 The cooling rate of -20°C / s is reduced to 220-250°C, placed in a s...

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Abstract

The invention discloses high-strength high-toughness high-carbon bainite steel. The high-carbon bainite steel comprises the chemical ingredients including 0.6% to 0.9% of C, 1.5% to 2.5% of Si, 1.5% to 2.5% of Mn, 0.5% to 1.5% of Cr, 0.1% to 0.3% of Mo and the balance Fe and inevitable impurity elements. The high-strength high-toughness high-carbon bainite steel has the characteristics of being low in cost and simple in process, and the prepared steel achieves excellent high toughness cooperation and is suitable for producing equipment bearing impact and fatigue action during work.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a high-strength, high-toughness high-carbon bainite steel and a preparation method thereof. Background technique [0002] The strength of steel increases with the increase of carbon content, but its plasticity and toughness decrease. How to achieve a good match between strength and plasticity has become an important issue to improve its performance and tap its potential. Compared with martensitic steels or bainitic / martensitic multiphase steels, bainitic steels with ultra-fine lath bainitic ferrite are favored for their better strong-plastic matching, impact toughness and fatigue strength. Widespread attention. [0003] Ultra-fine bainitic steel was proposed by Bhadeshia, University of Cambridge, etc. (US Patent US6884306). By using the inhibitory effect of Si on carbide precipitation, the ingot is austenitized and isothermal at a temperature slightly higher than the martensi...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/34C22C38/22C22C33/04C21D1/20C21D1/46C21D6/00
Inventor 修文翠吴化
Owner JILIN AGRI SCI & TECH COLLEGE
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