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Multiphase steel and preparation method thereof

A complex-phase steel and microstructure technology, applied in the field of hot-rolled steel plate production, can solve the problems of deteriorating wheel welding performance, high Al element content, and increased manufacturing cost, and achieve the effects of easy phase transformation strengthening, high strength, and improved strength.

Active Publication Date: 2014-03-26
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the hot rolling and cooling process in this patent is easier to implement, there are more alloying elements, especially the high content of Al, which increases the manufacturing cost accordingly
[0007] In addition, although the above-mentioned multi-phase steels achieve high strength, the high carbon equivalent and the addition of too many alloy elements will deteriorate the welding performance of the wheel

Method used

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  • Multiphase steel and preparation method thereof
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  • Multiphase steel and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment l

[0057] Embodiment 1: Select the chemical composition of high-strength steel, the percentage by weight is: C: 0.06%, Si: 0.62%, Mn: 1.5%, Ti: 0.036%; Cr: 0.62%; P: 0.049%; S: 0.003% ; Al: 0.032%; O: 0.0003%; N: 0.0005%; the rest is iron Fe and unavoidable impurities. The above-mentioned prepared raw materials were smelted on a 120-ton converter, and continuously cast into a continuous casting slab of 175mm×1250mm×11800mm, the continuous casting slab was heated to 1240°C for 170 minutes, and rolled on a hot continuous rolling mill. The rolling start temperature is controlled at 1150°C, the rough rolling finish rolling temperature is controlled at 1050°C, the rough rolling is carried out for 5 passes, the finish rolling start temperature is controlled at 1010°C, the finish rolling finish rolling temperature is controlled at 860°C, and the finish rolling is carried out for 5 passes , Water cooling is used between the finishing mills; the above-mentioned billets after rolling are s...

Embodiment 2

[0060] Embodiment 2: Select the chemical composition of high-strength steel, the weight percentage is: C: 0.08%, Si: 0.8%, Mn: 0.9%, Ti: 0.02%; Cr: 1.03%; P: 0.049%; S: 0.002% ; Al: 0.022%; O: 0.00035%; N: 0.00045%; the rest is iron Fe and unavoidable impurities.

[0061] The above-mentioned prepared raw materials were smelted on a 120-ton converter, and continuously cast into a continuous casting slab of 175mm×1230mm×11800mm, the continuous casting slab was heated to 1255°C for 160 minutes, and the rough rolling start temperature was controlled at 1200°C , The rough rolling finish rolling temperature is controlled at 1030°C, the rough rolling is 5 passes, the thickness of the intermediate billet is 35mm, after that, the intermediate billet is finished rolling, the finish rolling start temperature is controlled at 990°C, the finish rolling finish rolling temperature is controlled at 862°C, 6 passes of finishing rolling, water cooling is adopted between the finishing mills; the...

Embodiment 3

[0065] Embodiment 3: Select the chemical composition of high-strength steel, the weight percentage is: C: 0.92%, Si: 1.0%, Mn: 1.75%, Ti: 0.02%; Cr: 0.53%; P: 0.029%; S: 0.002% ; Al: 0.045%; O: 0.00029%; N: 0.00042%; the rest are iron Fe and unavoidable impurities.

[0066] The above-mentioned prepared raw materials were smelted on a 120-ton converter and continuously cast into a continuous casting slab of 175mm×1230mm×11800mm. The continuous casting slab was heated to 1265°C for 150 minutes, and the rough rolling start temperature was controlled at 1180°C , The rough rolling finish rolling temperature is controlled at 1040°C, the rough rolling is 5 passes, the thickness of the intermediate billet is 34mm, and then the intermediate billet is finished rolling, the finish rolling start temperature is controlled at 1000°C, and the finish rolling finish rolling temperature is controlled at 872°C. 6 passes of finishing rolling, water cooling is adopted between the finishing mills; ...

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Abstract

The invention discloses a kind of high-strength multiphase steel and a preparation method thereof. The multiphase steel comprises the following elements in percentage by weight: 0.06 to 0.10% of C, 0.61 to 1.1% of Si, 0.80 to 1.80% of Mn, 0.03 to 0.049% of P, not more than 0.05% of S, 0.02 to 0.05% of Al, 0.02 to 0.04% of Ti, 0.2 to 1.2% of Cr, not more than 0.003% of O, not more than 0.005% of N, and the balance being iron and inevitable impurities. The multiphase steel comprises an ultrafine polygonal ferrite structure, a bainite structure, and a martensitic structure, wherein the polygonal ferrite structure is the main component, and a certain amount of bainite structure and martensitic structure is dispersedly distributed in the polygonal ferrite structure. The preparation method achieves the phase-transition enhancement and fine crystal enhancement of the multiphase steel, improves the welding performance of the multiphase steel, and makes the multiphase steel have a good plasticity and toughness.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled steel plate production, and in particular relates to a multi-phase steel and a preparation method thereof. Background technique [0002] At present, in the field of automobile wheel manufacturing, steel plates with a tensile strength below 590MPa are commonly used, which are mainly used to manufacture automobile spokes, rims, etc. The strength and fatigue resistance of this type of steel are directly related to the stability and service life of the wheel quality. Therefore, it is generally required that these steels have high strength and excellent fatigue resistance at the same time. This is also the development of wheel lightweight technology. required by the trend. [0003] At present, ferritic and martensitic dual-phase steels meet the above requirements, but the preparation process of this steel has high requirements for cooling equipment, and the uncertainty of the preparation process ma...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C22C33/04
Inventor 赵培林
Owner LAIWU IRON & STEEL GRP
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