A kind of high-strength low-carbon bainitic refractory steel and its preparation method

Abstract

The invention relates to a high-strength low-carbon bainitic refractory steel and a preparation method thereof, which belongs to the technical field of low-carbon air-cooled bainitic refractory steel and solves the problems of low yield strength, complicated production process and high-temperature mechanics of refractory steel in the prior art. The problem of poor performance. A high-strength low-carbon bainitic refractory steel, the chemical composition of which is calculated by mass percentage: C: 0.07%‑0.1%, Si: 0.7%‑0.9%, Mn: 1.0%‑1.5%, Cr: 0.7%‑ 0.8%, Ni: 1.0%‑1.3%, Cu: 0.3%‑0.35%, Mo: 0.6%‑0.8%, Nb: 0.025%‑0.035%, V: 0.09%‑0.15%, Ti: 0.01%‑0.015% , (Nb+V+Ti)<0.2%, Alt<0.02%, S<0.003%, P<0.008%, and the balance is iron and unavoidable impurities. The invention improves the yield strength and high-temperature mechanical properties of the refractory steel.

Description

technical field [0001] The invention relates to the technical field of low-carbon air-cooled bainitic refractory steel, in particular to a high-strength low-carbon bainitic refractory steel and a preparation method thereof. Background technique [0002] With the rapid development of the modern construction industry, the method of coating the surface with refractory coating to improve the fire resistance of building materials has been gradually abandoned by people. The main reason is that the surface coating will increase the production cost, and the surface refractory coating will affect people impact on human health and increase environmental pollution. Therefore, people are gradually trying to improve the fire-resistant performance of buildings from the perspective of building materials themselves, and one of the important directions is to strengthen the development of fire-resistant steel. The so-called fire-resistant steel refers to the general provisions that the yield...

AI Technical Summary

Problems solved by technology

Due to the different thickness and size specifications of medium and heavy plates, the soaking time is different, the temperature process window is narrow when heating in the two-phase zone, and there are complex factors such as large temperature difference between the inside and outside of the steel plate, so it will inevitably lead to microstructure proportions. Huge technical difficulty in controlling instability and fluctuations in Nb solid solution resulting in fluctuations in refractory properties

Therefore, there are large technical bottlenecks in the production process and equipment that need to be broken through

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