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Heat-resistant steel for corrosion-resistant high-pressure boiler pipe and production method thereof

A technology for a high-pressure boiler and a production method, which is applied in the field of heat-resistant steel for corrosion-resistant high-pressure boiler tubes, can solve problems such as poor H2S corrosion resistance, and achieve the effects of reducing production costs, eliminating annealing procedures, and eliminating internal stress.

Active Publication Date: 2019-06-25
JIANGSU LIHUAI IRON AND STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing steel type 15Ni1MnMoNbCu has poor H2S corrosion resistance due to design limitations, and the high temperature strength and heat resistance can be improved. This requires the development of a corrosion-resistant heat-resistant steel for high-pressure boiler pipes

Method used

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  • Heat-resistant steel for corrosion-resistant high-pressure boiler pipe and production method thereof
  • Heat-resistant steel for corrosion-resistant high-pressure boiler pipe and production method thereof
  • Heat-resistant steel for corrosion-resistant high-pressure boiler pipe and production method thereof

Examples

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Embodiment Construction

[0074] 1) Molten iron transfer: A new type of molten iron ladle and its covered heat preservation device are used to transfer molten iron to reduce heat loss, facilitate pretreatment of molten iron, and improve smelting temperature conditions;

[0075]2) KR desulfurization: use the stirring head to stir clockwise in the ladle to make the molten iron form a vortex, put 450~900Kg self-made desulfurizer into the vortex at one time, stir for 12~15 minutes according to the sulfur content of the molten iron, and make the desulfurizer and molten iron The sulfur fully reacts, and then removes the desulfurization products through the slag remover, reduces the S content of the molten iron, and ensures that the S of the molten iron after desulfurization is ≤0.003%;

[0076] 3) Converter smelting: smelting in a top-bottom combined blowing converter with a capacity of more than 100 tons, using 85% molten iron and 15% high-quality scrap steel as raw materials for primary smelting to achieve ...

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Abstract

The invention discloses heat-resistant steel for a corrosion-resistant high-pressure boiler pipe and a production method thereof. The heat-resistant steel comprises the following chemical components of, by weight, 0.13%-0.15% of C, 0.25%-0.30% of Si, 1.00%-1.20% of Mn, 0.35%-0.45% of Cr, 0.25%-0.30% of Mo, 1.00%-1.10% of Ni, 0.50%-0.55% of Cu, 0.015%-0.030% of Nb, 0.015%-0.030% of Al, less than orequal to 0.013% of P, less than 0.003% of S, less than or equal to 0.010% of As, less than or equal to 0.010% of Sn, less than or equal to 0.010% of Pb, less than or equal to 0.010% of Sb, less thanor equal to 0.010% of Bi, less than or equal to 0.035% of As+Sn+Sb+Pb+Bi, less than or equal to 0.02% of V, less than or equal to 0.00015% of [H], less than or equal to 0.0020% of [O], less than or equal to 0.0070% of [N] and the balance Fe. According to the components, the heat-resistant steel for the corrosion-resistant high-pressure boiler pipe and the production method thereof have the advantages that a small amount of Cr elements are added, the Cu-Cr composite effect is utilized, and the high-temperature strength, the creep resistance and the H2S corrosion resistance of the high-pressureboiler pipe are improved.

Description

technical field [0001] The invention relates to the technical field of a corrosion-resistant high-pressure boiler tube heat-resistant steel, in particular to a corrosion-resistant high-pressure boiler tube heat-resistant steel and a production method thereof. Background technique [0002] Energy is closely related to human production and life. With the development of the world economy, energy consumption has increased rapidly, and the ensuing environmental problems have become more and more severe, such as air pollution and the greenhouse effect caused by carbon dioxide emissions. As a special steel in the energy field, heat-resistant steel is closely related to energy, power, and machinery industries. In thermal power generation, nuclear power, petrochemical, aerospace, applied chemistry and other fields, the performance life of heat-resistant steel is related to the development level of the industry. [0003] The heat-resistant steel for boiler tubes is mainly used in po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/48B22D41/00C21C1/02C21C5/35C21C7/00C21C7/06C21C7/076C21C7/072C21C7/10C21D1/84C21D6/00C22C33/04
CPCY02P10/20
Inventor 左辉张洪才许光乐石可伟郑力宁肖波
Owner JIANGSU LIHUAI IRON AND STEEL CO LTD
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