A kind of niobium microalloyed trip steel and preparation method thereof
A technology of micro-alloying and micro-alloying steel, which is applied in the field of high-strength steel and can solve problems such as unfavorable industrial production and harsh conditions
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[0032] The invention provides a method for preparing niobium microalloyed TRIP steel. The niobium microalloyed steel is heat-preserved at 800-1000°C for 3-5 minutes and then quenched to obtain a partially austenitic alloyed steel; wherein, niobium Microalloyed steel includes the following components in mass percentage: C 0.15-0.3%, Mn 1.0-3.0%, P 0.05-0.15%, Si≤0.3%, Al 0.5-3.0%, Nb 0.01-0.1%, the balance Fe; then the obtained partial austenitic alloy steel is annealed at 720-900°C for 1-10 minutes, cooled, and then hot-dip galvanized at 460-480°C for 10-60s to obtain niobium microalloyed TRIP steel.
[0033] The structure obtained by the method provided by the present invention contains a certain amount of martensite to ensure the acquisition of high strength; and the guarantee of elongation is through three-stage heat treatment after heat preservation treatment, quenching and subsequent annealing treatment, so that the residual austenite The body is distributed in the annea...
Embodiment 1
[0064] According to the following weight percentages: C: 0.18%; Mn: 1.2%; P: 0.06%; Si: 0.05%; Al: 0.8%; Nb: 0.04%; , and forged into a billet, the billet was heated to 1200 ° C with the furnace and kept for 3 hours.
[0065] Then rolling on a hot rolling mill, the rough rolling start temperature is controlled at 1100°C, the rough rolling finish temperature is controlled at 1100°C, and the steel billet with a thickness of 60mm is rolled to 36mm. The finish rolling temperature was controlled at 850°C to obtain a steel plate with a thickness of 4 mm; at a coiling temperature of 400°C, a phase change insulation was carried out for 1.5h, and then air-cooled to room temperature to obtain a hot-rolled steel plate.
[0066] The hot-rolled steel plate is pickled, cold-rolled with 70% deformation, and made into a chilled plate with a thickness of 1.2 mm for future use.
[0067] Heat the chilled plate to 1000°C at a heating rate of 10°C / s, and hold it isothermally for 3 minutes; then q...
Embodiment 2
[0070] According to the following weight percentages: C: 0.3%; Mn: 3.0%; P: 0.15%; Si: 0.3%; Al: 3.0%; For square steel billets, the steel billets are heated to 1300°C with the furnace and kept for 1.5 hours.
[0071] Then rolling on a hot rolling mill, the rough rolling start temperature is controlled at 1100°C, the rough rolling finish temperature is controlled at 1100°C, and the steel billet with a thickness of 60mm is rolled to 30mm. The temperature of finish rolling and initial rolling is controlled at 950°C, and the temperature of final rolling is controlled at 900°C to obtain a steel plate with a thickness of 6mm; at a coiling temperature of 400°C, a phase change insulation is carried out for 1.5h, and then air-cooled to room temperature to obtain a hot-rolled state steel plate.
[0072] The hot-rolled steel plate is pickled, cold-rolled with 70% deformation, and made into a chilled plate with a thickness of 2.1mm for future use.
[0073] Heat the chilled plate to 800...
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