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HIGH STRENGTH AND HIGH TOUGHNESS HOT ROLLED MEDIUM MANGANESE STEEL FOR AUTOMOTIVE APPLICATIONS PRODUCT AND PROCESS FOR MANUFACTURING THEREOF
HIGH STRENGTH AND HIGH TOUGHNESS HOT ROLLED MEDIUM MANGANESE STEEL FOR AUTOMOTIVE APPLICATIONS PRODUCT AND PROCESS FOR MANUFACTURING THEREOF
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机译：汽车用高强度高韧性热轧中锰钢产品及其制造工艺
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摘要
The present invention relates to a high-strength and high toughness hot-rolled steel strip with a minimum toughness of 30 GPa% and method of manufacturing the same. The high-strength hot-rolled steel strip of the current invention finds use in automotive applications like front bumper beam, wheel house, door impact beam etc. The medium manganese steel comprises of 0.15 - 0.25 % of carbon, 4 - 6 % of manganese, up to 1 % of silicon (excluding zero), up to 0.02 % of titanium, up to 1 % of aluminum (excluding zero), maximum up to 0.01 % of sulphur, maximum up to 0.03 % of phosphorous and up to 0.01 % of nitrogen, the balance being iron and impurities. The method for manufacturing such steel includes casting of slab, reheating the slab to 1200 °C followed by hot rolling where in the finish rolling temperature is done at T1, wherein T1 varies in the range A3 + 50 (°C) to A3 + 70 (°C), A3 is the temperature at which austenite starts transforming to ferrite, followed by Quenching the steel, followed by an intercritical annealing at temperature T3, such that (A3- 50 °C) T3 (A3 - 150 °C) for 3 4 hours followed by cooling to room temperature.
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