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Bainite steel plate with high elongation, high strength and low carbon and production method thereof

A low-carbon bainite and carbon bainite steel technology, applied in the direction of temperature control, furnace type, furnace, etc., can solve the problems of low elongation, forming influence, poor plasticity, etc., achieve high elongation, improve life, good strength effect

Inactive Publication Date: 2012-10-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional steel materials achieve the purpose of increasing strength by increasing the carbon content and the total amount of the alloy, but the consequence of doing so is to sacrifice the welding performance and low temperature toughness of the material
[0003] At present, the carbon content of ultra-high-strength steel with a yield strength of 1100MPa is basically about 0.2% to 0.4%. influences

Method used

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  • Bainite steel plate with high elongation, high strength and low carbon and production method thereof
  • Bainite steel plate with high elongation, high strength and low carbon and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] According to the mass percentage of chemical composition C: 0.075%, Si: 0.55%, Mn: 1.7%, P: 0.0069%, S: 0.005%, Cr: 0.4%, Mo: 0.37%, Cu: 0.8%, Nb: 0.06%, Ti: 0.02%, B: 0.0015%, Ni: 0.79%, V: 0.036%, molten steel is smelted in a vacuum electromagnetic induction furnace, and cast into a steel ingot, the thickness of the steel ingot is 70mm, the steel billet is heated to 1230 ° C, and kept for 2 hours, Rolling is carried out on a two-roll mill, the starting temperature is 1160°C, the final rolling is at 1050°C, the cumulative reduction rate is 62%, and then the second stage rolling is started when the temperature reaches 950°C, the final rolling temperature is 800°C, The thickness of the plate after rolling is 10mm. After the temperature reaches 780°C, it is quenched to 300°C, air-cooled to room temperature; then heated to 930°C and kept for 45 minutes, and then quenched to room temperature. After tempering at 650°C for 1 hour, water-cooled to room temperature, then temper...

Embodiment 2

[0033]According to the mass percentage of chemical composition C: 0.18%, Si: 1.55%, Mn: 1.13%, P: 0.0059%, S: 0.005%, Cr: 0.40%, Mo: 0.35%, Cu: 0.30%, Nb: 0.059%, Ti: 0.15%, B: 0.001%, Ni: 0.76%, V: 0.05%. Melt molten steel in a vacuum electromagnetic induction furnace and cast it into a steel ingot. The thickness of the steel ingot is 70mm. Two-stage rolling is carried out on the two-roll mill, the starting temperature is 1130°C, the final rolling temperature of the first stage is 1050°C, and the cumulative reduction rate is 62%, the second stage rolling starts when the temperature reaches 950°C, and the final rolling temperature The temperature is 810°C, the cumulative reduction rate is greater than 60%, and the thickness of the rolled plate is 10mm. Wait until the temperature reaches 760°C, then quench to 280°C, then air cool to room temperature; heat up to 960°C and keep for 45 minutes, then quench to room temperature. After heating to 630°C and tempering for 1 hour, wate...

Embodiment 3

[0035] According to the mass percentage of chemical composition C: 0.15%, Si: 1.0%, Mn: 1.3%, P: 0.004%, S: 0.003%, Cr: 0.36%, Mo: 0.4%, Cu: 0.30%, Nb: 0.04%, Ti: 0.20%, B: 0.0015%, Ni: 0.7%, V: 0.05%, molten steel is smelted in a vacuum electromagnetic induction furnace, and cast into a steel ingot, the thickness of the steel ingot is 70mm, and the steel billet is heated to 1200°C for 2 hours. Two-stage rolling is carried out on the two-roll mill, the starting temperature is 1160°C, the final rolling temperature of the first stage is 1040°C, and the cumulative reduction rate is 62%. The second stage rolling starts when the temperature reaches 950°C, and the final rolling temperature The temperature is 820°C, the cumulative reduction rate is greater than 60%, and the thickness of the rolled plate is 10mm. Wait until the temperature reaches 780°C, then quench to 280°C, air cool to room temperature; raise the temperature to 940°C and keep it for 45 minutes, then quench to room t...

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Abstract

The invention discloses a bainite steel plate with high elongation, high strength and low carbon and a production method thereof. The production method can produce the steel plates with high elongation, high strength and good low-temperature toughness and welding performance, wherein the elongation is more than or equal to 20% and the yield strength is more than or equal to 1100 MPa. The steel plate comprises the following chemical compositions in percentage by mass: 0.06-0.18% of C, 0.55-1.7% of Si, 1.1-1.7% of Mn, more than or equal to 0.007% of P, more than or equal to 0.006% of S, more than or equal to 0.0040% of N, 0.02-0.06% of Nb, 0.25-0.4% of Mo, 0.01-0.02% of Ti, 0.3-0.5% of Cr, 0.3-0.8% of Ni, 0.3-0.8% of Cu, 0.025-0.05% of V, and 0.0005-0.0015% of B, optionally 0.015-0.02% of ALs, and the balance Fe and inevitable impurities. The microstructure of the steel plate is a multiphase structure and contains bainite structure, martensite structure, a small amount of residual austenite structure and carbide with dispersedly distributed Nb, V, Ti and others elements at the same time. The method for producing the bainite steel plate with high elongation, high strength and low carbon comprises the following steps of preparation of materials, converter or smelting in electric furnace, external refining, continuous casting, reheating of slabs, controlled rolling, controlled cooling, and heat treatment.

Description

technical field [0001] The invention relates to a low-carbon bainite steel plate with high elongation and high strength and a production method thereof, in particular to a steel plate for construction machinery with high elongation and high strength. In particular, it involves the production method of 1100MPa high-elongation and high-strength steel plate. Based on the martensite / bainite multiphase structure, and exerting the effect of retained austenite on improving the toughness of steel, a method mainly composed of bainite is designed. High elongation and high strength steel plate composed of two phases of martensite and martensite. This steel plate has excellent welding performance and good low temperature toughness at the same time, and a suitable production process is given. Background technique [0002] With the development of the industrial level, the manufacturing and production of various engineering machinery, bridges, and vehicles involved in the industrial fields...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/58C22C38/54B21B37/74C21D9/00
Inventor 余伟徐立善陈银莉蔡庆伍刘涛何春雨
Owner UNIV OF SCI & TECH BEIJING
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