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Research and Development of a High Strength Micro-alloyed Steel with Yield Strength of 700MPa

Author: LuJiangXin
Tutor: WangGuoDong；LiuXiangHua
School: Northeastern University
Course: Materials Processing Engineering
Keywords: High-strength low-alloy steel Hot rolling High yield strength Precipitation strengthening Industrial Production
CLC: TF762
Type: PhD thesis
Year: 2005
Downloads: 1282
Quote: 11
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Abstract


This thesis yield strength 700MPa high strength micro-alloy steel (hereinafter referred to as BS700MC) mechanism of physical metallurgy and industrial production technology. Reasonable assurance BS700MC ingredients are the basis of performance. BS700MC require both high strength, but also requires a good formability, low temperature impact properties and weldability, but also consider the problem of mass production of the mill load. Therefore, BS700MC using Nb, Ti composite addition of micro-alloyed steel component system to precipitation strengthening, supplemented by phase transformation strengthening and fine grain strengthening, to achieve a low rolling resistance and high product deformation strength, so that Baosteel mass BS700MC possible. Ti is an BS700MC main precipitation strengthening element, laboratory tests show that under certain conditions, can lead to a 0.1% Ti improves the strength of 200MPa or more, but with the increased content of Ti, BS700MC intensity on the coiling temperature more sensitive to changes. Mo addition inhibits the formation of polygonal ferrite can be formed at higher temperatures non-polygonal ferrite, not only brought dislocation strengthening, but also to play a greater level of precipitation strengthening. Therefore, even a small amount of Mo is also enhanced with great results. Single-pass compression through thermal simulation obtained BS700MC true stress - true strain curve. BS700MC stress values ??increase with strain rate, temperature reduction and the increase of the degree of deformation increases. Since Nb containing more elements of the test under the given conditions, did not find a dynamic recrystallization. Use creep equation was established BS700MC high temperature flow stress model and predict the different rates of flow stress and temperature predicted results agree well with the real side of the value. To demonstrate Baosteel 2050 BS700MC mill capable of producing high-strength hot-rolled steel by thermal simulation experiment comparing three steel deformation resistance. Analysis shows, BS700MC in 900 ~ 950 ℃ deformation resistance and structural steel 50kg 800 ~ 850 ℃ rolling deformation resistance closer, which shows that the higher the final rolling temperature in the production line 2050 Steel industrial production is feasible. Heating temperature to precipitation strengthening based on the strength of BS700MC greatly. Experimental studies have shown reasonable assurance slab heating temperature must already exist in a large number of carbon nitride precipitates can be fully dissolved in the heating process. In between 1150 ℃ ~ 1250 ℃, the heating temperature rise 50 ℃, strength increased nearly 100MPa. Due to the fine grain strengthening and precipitation strengthening interaction, finish rolling temperature on the strength of obvious.

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CLC: > Industrial Technology > Metallurgical Industry > Steelmaking > A variety of steel smelting > High quality steel
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