Ferrite high temperature steel

A heat-resistant steel and ferrite technology, applied in the field of ferritic heat-resistant steel, can solve the problems of complex precipitation process, and achieve the effect of simple alloy heat treatment process, operability, and controllable size or shape.

Active Publication Date: 2017-11-07
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, studies have found that Ni 16 m 6 Si 7 The precipitation process of silicide phase in martensitic steel and duplex stainless steel is complicated, and most of them are harmful phases
However, there has not been any report on the research of this compound in ferritic steel.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A nanoscale Ni 16 m 6 Si 7 (M=Ti, Nb) precipitated phase strengthened ferritic heat-resistant steel and its preparation method. The chemical composition and content of the high-chromium ferritic heat-resistant steel are: 19wt.% of Cr; 3wt.% of Ni; 0.3wt.% of Mn; 3wt.% of Si; 1.5wt.% of Ti; C is 0.08wt.%; B is 0.05wt.%; the balance is Fe and unavoidable impurities.

[0043] According to the chemical composition and content of the high-chromium ferritic heat-resistant steel, the ingredients are mixed, the alloy is melted in a vacuum arc melting furnace, hot-rolled into a plate, and then aged at 660 ° C for 20 minutes, and air-cooled. Describe Ni 16 m 6 Si 7 (M=Ti, Nb) strengthened ferritic heat-resistant steel. figure 1 for nanoscale Ni 16 m 6 Si 7 Typical microstructure and diffraction pattern of (M=Ti,Nb) precipitate-strengthened ferritic heat-resistant steel, showing that Ni 16 m 6 Si 7 (M=Ti, Nb) are nano-scale dispersed particles and have a coherent rel...

Embodiment 2

[0045] A nanoscale Ni 16 m 6 Si 7 (M=Ti, Nb) precipitate-strengthened element heat-resistant steel and its preparation method. The chemical composition and content of the high-chromium ferritic heat-resistant steel are: Cr is 22wt.%; Ni is 1.8wt.%; Mn is 0.5wt.%; Si is 3.3wt.%; Nb is 1.3wt.%. %; C is 0.05wt.%; B is 0.05wt.%; the balance is Fe and unavoidable impurities.

[0046] According to the chemical composition and content of the high-chromium ferritic heat-resistant steel, the ingredients are mixed, the alloy is melted in a vacuum arc melting furnace, hot-rolled into a plate, and then aged at 760°C for 30 minutes, and air-cooled to obtain the obtained product. Describe Ni 16 m 6 Si 7 (M=Ti, Nb) Precipitation-strengthened ferritic heat-resistant steel. figure 2 Hardness versus aging time of the 22Cr ferritic heat-resistant steel prepared for Example 2 after aging at 660°C, Ni 16 m 6 Si 7 (M=Ti, Nb) precipitation makes the Vickers hardness of the alloy steel fro...

Embodiment 3

[0048] A nanoscale Ni 16 m 6 Si 7(M=Ti, Nb) particle reinforced ferritic heat-resistant steel and its preparation method. The chemical composition and content of the high-chromium ferritic heat-resistant steel are: Cr is 18wt.%; Ni is 2.5wt.%; Mn is 0.5wt.%; Si is 2wt.%; Ti is 0.85wt.% ; C is 0.07wt.%; B is 0.05wt.%; the balance is Fe and unavoidable impurities.

[0049] According to the chemical composition and content of the high-chromium ferritic heat-resistant steel, the ingredients are mixed, the alloy is melted in a vacuum arc melting furnace, hot-rolled into a plate, and then aged at 660 ° C for 30 minutes, and air-cooled. Describe Ni 16 m 6 Si 7 (M=Ti, Nb) precipitation strengthened ferritic heat-resistant steel. image 3 The room temperature and high temperature tensile curve of the 19Cr ferritic heat-resistant steel prepared for the implementation of case 3 shows that Ni 16 m 6 Si 7 The precipitation of (M=Ti, Nb) phase increases the room temperature ultima...

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Abstract

The invention discloses Fe-Cr-based ferrite high temperature steel. The components of the steel are composed of main elements including Fe and Cr, alloying elements including Ni, Mn, Si, Ti and Nb, microalloying elements including C and B and inevitable impurities. The high temperature steel comprises, by mass, of 65-75% of Fe, 18-25% of Cr, 1-5% of Ni, 0-2% of Mn, 2-4% of Si, 0.5-3% of Ti, 1-2.5 % of Nb, 0-0.05% of C and 0-0.08% of B, wherein the total mass percentage of Fe and Cr is 85-95%, the total mass percentage of Ni, Mn, Si, Ti and Nb is 7-13%, and the total mass percentage of C and B is 0-0.1%. A high temperature steel matrix in the technical scheme is a Fe-Cr-based ferrite, in the aging procedure, a spherical dispersedly-distributed coherent lattice nanoscale intermetallic compound Ni16M6Si7 (M=Ti, Nb) phase is dissolved out from the matrix to enable the strength of the steel to be obviously improved. The room-temperature tensile strength of the high temperature steel reaches 950 Mpa, and the instantaneous tensile strength under the high temperature of 600 DEG C is 300 Mpa or over.

Description

technical field [0001] The invention relates to ferritic heat-resistant steel, in particular to an intermetallic compound Ni 16 m 6 Si 7 (M=Ti, Nb) precipitation strengthened ferritic heat-resistant steel. Background technique [0002] To improve thermal efficiency and reduce CO 2 To meet the requirements of environmental protection and energy conservation, it is imminent to increase the heat-resistant temperature of steel for boiler tubes in order to improve the thermal efficiency of power plants (Quanrong; Research and development progress of ferritic heat-resistant steel for advanced coal-fired thermal power boilers and steam turbines [N] ; World Metal Bulletin; 2014.04.29:B12). At present, the parameters of thermal power generating units in various countries in the world have developed from subcritical parameters (16.77MPa / 540℃) to supercritical parameters (25.0MPa / 540℃~566℃; 24.0~30.0MPa / 580℃~610℃) and above. It has increased by 6-7% than before (Chen Tingkuan; Dev...

Claims

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Application Information

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IPC IPC(8): C22C38/54C22C38/58C22C38/50C22C38/48C22C38/02
CPCC22C38/02C22C38/48C22C38/50C22C38/54C22C38/58
Inventor 刘兴军杨木金王翠萍张锦彬韩佳甲卢勇施展杨水源
Owner XIAMEN UNIV
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