Method for producing thin-specification anti-seismic refractory steel by adopting continuous rolling and rolling heat preservation

Abstract

The invention discloses a method for producing thin-specification anti-seismic refractory steel by adopting continuous rolling and rolling heat preservation, and relates to the technical field of steel production. The methodcomprises the following steps: cogging and rolling by adopting a medium-thickness plate rolling mill, rolling an original blank into an intermediate blank with the thickness of 110-130 mm, naturally cooling, returning the intermediate blank to a furnace, heating the intermediate blank to 1220-1260 DEG C, and controlling the austenitizing temperature. The temperature is higher than the full solid solution temperature of microalloy elements Nb and V but lower than the TiN redissolution temperature, the effect of inhibiting austenite grain growth of solid solution TiN is fully utilized, a fine and uniform original austenite structure is obtained, and the good plate shape and excellent comprehensive performance are achieved.

Description

technical field [0001] The invention relates to the technical field of iron and steel production, in particular to a method for producing thin gauge anti-seismic fire-resistant steel by adopting continuous rolling and coil rolling heat preservation. Background technique [0002] At present, the fire-resistant steel plates developed at home and abroad are designed with high Mo composition, mainly using the strong high-temperature solid solution strengthening effect of Mo to ensure the high-temperature strength below 600 °C, usually adding not less than 0.5wt.% Mo and Nb, V, Ti microalloying. In order to reduce the cost, the Mo content will decrease, but it is still around 0.3%. For example, 0.51% to 0.60% Mo is added in the patent application "An anti-seismic fire-resistant steel and its preparation method" with the application number 202010053131.1. Stage-controlled rolling process production; patent application No. 201910002022.4 "An anti-seismic fire-resistant steel for h...

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Problems solved by technology

In order to reduce the cost, the Mo content will decrease, but it is still around 0.3%. For example, 0.51% to 0.60% Mo is added in the patent application "An anti-seismic fire-resistant steel and its preparation method" with the application number 202010053131.1. Stage-controlled rolling process production; patent application No. 201910002022.4 "An anti-seismic fire-resistant steel for high-strength building structures and its preparation method" added 0.1% to 0.60% Mo, and kept warm in the α+γ phase area after rolling The heat treatment process of post-quenching and tempering increases the cost of the process; the patent application No. 201110080774.6 "low-cost high-strength high-toughness anti-seismic refractory steel and its preparation process" adds 0.2% to 0.4% Mo, using controlled rolling and controlled cooling Process production; patent application with application number 20160807258.1 "A 345MPa yield refractory steel plate and its production method" added 0.15% to 0.25% Mo, and was produced by controlled rolling air cooling + tempering process; patent application number 200810179362.6 The content of Mo in the application for "a fire-resistant steel and its manufacturing method" is 0.20% to 0.40%, and 0.05% to 0.12% V is added at the same time, and the cost of the alloy is relatively high

[0003] At the same time, for thin refractory steel plates with a thickness of 5-10mm, the main production difficulties lie in the difficulty of rolling the steel plates, the high temperature performance is difficult to guarantee, and the control of the plate shape is also an important difficulty.

Therefore, it is very difficult to produce this kind of thin-gauge anti-seismic fire-resistant steel at present, and there are no related technical reports specifically for this kind of thin-gauge fire-resistant steel

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