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Chromium-molybdenum steel plate having excellent creep strength and method for manufacturing same

A creep strength and steel plate technology, applied in the field of chromium molybdenum steel plate and its preparation, can solve the problem of impossible mass production, and achieve the effect of excellent high temperature creep life and long creep life

Active Publication Date: 2021-07-23
浦项股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, a heat-resistant steel is proposed that suppresses (Fe, Cr) that is thermodynamically unstable and prone to coarsening to reduce creep characteristics by extremely reducing the carbon content to 0.002 wt%. 23 C 6 The formation of carbides, and the creep characteristics are greatly improved by the precipitation of fine carbonitrides, but for heat-resistant steels with reduced carbon content as above, it is currently almost impossible to mass-produce such heat-resistant steels commercially

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  • Chromium-molybdenum steel plate having excellent creep strength and method for manufacturing same
  • Chromium-molybdenum steel plate having excellent creep strength and method for manufacturing same
  • Chromium-molybdenum steel plate having excellent creep strength and method for manufacturing same

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preparation example Construction

[0084] The preparation method of the precipitation-solidified chromium-molybdenum steel plate with excellent creep strength of the present invention comprises the following steps: hot-rolling the steel billet having the above-mentioned composition, so that the finish rolling temperature becomes above Ar3 to prepare the hot-rolled steel plate and then cooling; The cooled hot-rolled steel sheet is reheated in the temperature range of 900°C to 1200°C for 1t to 3t minutes [t (mm) is the thickness of the hot-rolled steel sheet] to austenitize the hot-rolled steel sheet; Quenching the austenitized hot-rolled steel sheet to normal temperature; and tempering the rapidly cooled hot-rolled steel sheet at a temperature range of 675-800° C. for 30-120 minutes.

[0085] First, in the present invention, a steel slab having the above composition is hot-rolled so that the finishing temperature becomes Ar3 or higher to obtain a hot-rolled steel sheet. The reason for hot rolling in the austenit...

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Abstract

Provided are a chromium-molybdenum steel plate having excellent creep strength and a method for manufacturing same. The chromium-molybdenum steel plate of the present invention comprises, by weight%, 0.11-0.15% of C, 0.10% or less of Si (exclusive of 0%), 0.3-0.6% of Mn, 0.010% or less of S (exclusive of 0%), 0.015% or less of P (exclusive of 0%), 2.0-2.5% of Cr, 0.9-1.1% of Mo, 0.65-1.0% of V, 0.25% or less of Ni (exclusive of 0%), 0.20% or less of Cu (exclusive of 0%), 0.07% or less of Nb (exclusive of 0%), 0.03% or less of Ti (exclusive of 0%), 0.015% or less of N (exclusive of 0%), 0.025% or less of Al (exclusive of 0%), 0.002% or less of B (exclusive of 0%), and the remainder of Fe and unavoidable impurities.

Description

technical field [0001] The present invention relates to a method for preparing a chromium-molybdenum steel plate with excellent creep characteristics, and in more detail, relates to a chromium-molybdenum steel plate and a preparation method thereof: the chromium-molybdenum steel plate passes through the composition phase martensite matrix of the steel Only carbonitrides are formed on the grain boundaries to hinder dislocation movement at high temperatures, and to ensure the stability of sub-grains, so that it can have excellent creep strength. Background technique [0002] In the power generation and oil refining / refining industries, it is necessary to consider the construction of environmental protection equipment and the efficient use of energy. [0003] First, in order to increase power generation efficiency, it is necessary to increase the temperature and pressure of steam supplied to the turbine, so it is necessary to improve the heat resistance of boiler materials that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/46C22C38/42C22C38/48C22C38/50C22C38/54C22C38/00C22C38/06C22C38/02C22C38/04
CPCC22C38/04C21D9/46C21D2211/008C21D1/25C21D8/0247C21D8/0273C21D8/0257C21D8/0226C21D8/0263C21D1/28C22C38/46C22C38/44C22C38/42C22C38/48C22C38/50C22C38/54C22C38/02C22C38/06C22C38/001C21D8/0205C21D6/02C21D6/004C21D6/005C21D1/22C21D1/18C21D6/008
Inventor 成贤济金旲优
Owner 浦项股份有限公司
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