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Ferrite heat-resistant steel

A heat-resistant steel and ferrite technology, applied in the field of heat-resistant alloy steel, can solve the problems of metal high-temperature performance deterioration, affecting equipment safety, etc., and achieve the effects of good weldability, high lasting strength, and improved heat resistance.

Inactive Publication Date: 2013-06-05
JIANGSU XIHU SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat-resistant steel in the boiler tube works under high temperature, high pressure and steam corrosion for a long time, the structure and performance of the steel will change, which will obviously deteriorate the high temperature performance of the metal, thus affecting the safety of equipment operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A ferritic heat-resistant steel, the mass percentage of its chemical composition is: C: 0.08%, Cr: 13%, W: 3.0%, Co: 3.0%, Si: 0.4%, Mo: 0.5%, Mn: 0.2% , V: 0.3%, Nb: 0.04%, N: 0.04%, Ta: 0.06%, B: 0.003%, Lanthanum-rich rare earth: 0.05%. After the molten alloy steel with the above composition is cast into a steel slab, hot rolling and pickling are performed. Further cold rolling, annealing and pickling.

Embodiment 2

[0029] A ferritic heat-resistant steel, the mass percentage of its chemical composition is: C: 0.10%, Cr: 11%, W: 2.0%, Co: 3.0%, Si: 0.4%, Mo: 0.6%, Mn: 0.4% , V: 0.2%, Nb: 0.05%, N: 0.05%, Ta: 0.05%, B: 0.003%, Lanthanum-rich rare earth: 0.10%. After the molten alloy steel with the above composition is cast into a steel slab, it is hot-rolled, annealed and pickled. Further cold rolling, annealing and pickling.

Embodiment 3

[0031] A ferritic heat-resistant steel, the mass percentage of its chemical composition is: C: 0.10%, Cr: 9%, W: 2.0%, Co: 2.5%, Si: 0.5%, Mo: 0.3%, Mn: 0.8% , V: 0.2%, Nb: 0.08%, N: 0.05%, Ta: 0.05%, B: 0.003%, Lanthanum-rich rare earth: 0.08%. After the molten alloy steel with the above composition is cast into a steel slab, it is hot-rolled, annealed and pickled. Further cold rolling, annealing and pickling.

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Abstract

The invention discloses a ferrite heat-resistant steel. The ferrite heat-resistant steel is a heat-resistant alloy steel which has high temperature resistance and corrosion resistance and is used for an ultra supercritical fire-coal thermal power station boiler. The ferrite heat-resistant steel comprises, by mass, less than or equal to 0.10% of C, 8 to 15% of Cr, less than or equal to 3.0% of W, less than or equal to 3.0% of Co, 0.1 to 0.5% of Si, 0.2 to 0.8% of Mn, 0.3 to 0.6% of Mo, 0.2 to 0.3% of V, 0.05 to 0.10% of Nb, less than or equal to 0.05% of N, less than or equal to 0.08% of Ta, and the balance Fe and unavoidable impurities. The ferrite heat-resistant steel can be used at a high temperature of 650 DEG C and has excellent heat resistance and good corrosion resistance.

Description

technical field [0001] The invention designs a metal structure and functional material, in particular, relates to a high-temperature-resistant and corrosion-resistant heat-resistant alloy steel for an ultra-supercritical coal-fired thermal power plant boiler. Background technique [0002] The development of heat-resistant steel is closely related to the progress of energy, power and machinery industries. In the fields of new technology development such as thermal power generation, nuclear energy, aerospace, aviation, petroleum and chemical industries, the performance of heat-resistant steel is the key to its success, so the importance of heat-resistant steel is increasing day by day. Especially in recent years, in order to solve the increasingly prominent energy shortage and environmental pollution problems, high-efficiency super (super) critical voltage power generation has become a hot topic in the world. The parameters of thermal power generating units in various countr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/26C22C38/30C22C38/32
Inventor 董吉林马立群翟素萍翟海平徐华翟华平翟世先陶文明
Owner JIANGSU XIHU SPECIAL STEEL
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