High-strength-toughness and high-temperature hot rolled steel plate and preparation method thereof

Abstract

The invention discloses a high-strength-toughness and high-temperature hot rolled steel plate and a preparation method thereof. The high-strength-toughness and high-temperature hot rolled steel plate is prepared from the following chemical components in percentage by weight: 0.04-0.15 percent of C, 0.05-0.35 percent of Si, 0.5-2.5 percent of Mn, 0.005-0.025 percent of Ti, smaller than or equal to 1.0 percent of Cr, smaller than or equal to 0.5 percent of Mo, smaller than or equal to 1.0 percent of Ni, smaller than or equal to 0.5 percent of Cu, smaller than or equal to 0.003 percent of B, smaller than or equal to 0.02 percent of P, smaller than or equal to 0.01 percent of S, smaller than or equal to 0.007 percent of N, 0.001-0.006 percent of O, smaller than or equal to 0.03 percent of the total content of elements including Al, Zr, Mg, Ca and rare earth and the balance of Fe and inevitable impurity elements. The preparation method of the steel plate comprises the following steps: smelting and casting according to the components, carrying out high-temperature continuous rolling by adopting an austenite, carrying out accelerated cooling by watering the steel plate after being rolled, and then air cooling to room temperature, wherein the heating temperature of a steel billet is 1150-1260 DEG, the cooling temperature is larger than or equal to 5 DEG C / s. and the finish cooling temperature is 550-650 DEG C . As a microscopic structure of the steel plate is a fined acicular ferrite type structure, the steel plate is good in strength and toughness properties. The preparation method of the steel plate is flexible in process and simple in operation, saves the cost and improves the production efficiency.

Description

technical field [0001] The invention relates to the technical field of steel products, in particular to a high-strength toughness high-temperature hot-rolled steel plate and a preparation method thereof. Background technique [0002] Controlled rolling and controlled cooling technology is an important means to improve the comprehensive mechanical properties of hot-rolled steel. The traditional controlled rolling process includes two-stage rolling in the austenite recrystallization zone and non-recrystallization zone. First, through the rolling deformation in the recrystallization zone, the coarsened austenite grains are repeatedly recrystallized during the heating process and the size is refined, and then enter the austenite non-recrystallization zone when the temperature is high, and after sufficient deformation accumulation, the austenite is effective The grain size is significantly refined and the work-hardened state is maintained. Therefore, in the subsequent controlle...

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Problems solved by technology

In addition, the uniform distribution of fine inclusions formed by Ti or composite deoxidation with other elements in the steel also has the ability to promote the formation of intragranular ferrite, but the existing technology usually uses such inclusions to improve the welding heat-affected zone. However, the matrix structure of the hot-rolled steel plate cannot be directly refined, and the traditional controlled rolling, controlled cooling and heat treatment processes are still required to improve the properties of the steel plate

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