Precipitation strengthening high-carbon austenitic heat-resistance steel and preparation method thereof

A technology for austenitic heat-resistant steel and precipitation strengthening, applied in the field of precipitation-strengthening high-carbon austenitic heat-resistant steel and its preparation, can solve the problems of adverse effects on alloy properties, limited effect of alloy structure, etc., and achieve carbide growth rate The effect of slowing down, eliminating eutectic carbides and stabilizing the structure and properties of alloys

Inactive Publication Date: 2017-05-10
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, adding a small amount of rare earth elements has a limited effect on the refinement of the alloy structure, and excessive addition of rare earth elements will have an adverse effect on the properties of the alloy.

Method used

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  • Precipitation strengthening high-carbon austenitic heat-resistance steel and preparation method thereof
  • Precipitation strengthening high-carbon austenitic heat-resistance steel and preparation method thereof
  • Precipitation strengthening high-carbon austenitic heat-resistance steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The precipitation-strengthened high-carbon austenitic heat-resistant steel of this embodiment, by mass percentage, includes: C: 0.7%, Cr: 25%, Ni: 45%, Mn: 1.0%, Si: 2.5%, Nb: 1.0 %, W: 5.0%, Ti: 1.0%, and the balance is Fe. In this embodiment, the mass percent content of Ti and Nb satisfies Ti / Nb≥0.7, and Ti+Nb≥2.

[0026] The preparation method of the present embodiment heat-resistant steel comprises the following steps:

[0027] 1) Raw material preparation: The ingredients include by mass percentage: C: 0.7%, Cr: 25%, Ni: 45%, Mn: 1.0%, Si: 2.5%, Nb: 1.0%, W: 5.0%, Ti: 1.0% , the balance is Fe, and the alloy is prepared according to the above mass percentage;

[0028] 2) Smelting step: All the elements except Si and Mn in the above components are melted into the alloy mother liquid by induction furnace. After the molten steel reaches 1500°C, silicon and manganese are added for deoxidation, and P and S impurities in the mother liquid are controlled. The mass percen...

Embodiment 2

[0030] The precipitation-strengthened high-carbon austenitic heat-resistant steel in this embodiment includes, by mass percentage: C: 0.75%, Cr: 28%, Ni: 48%, Mn: 1.5%, Si: 2.1%, Nb: 0.5 %, W: 7.5%, Ti: 1.6%, and the balance is Fe.

[0031] The preparation method of the present embodiment heat-resistant steel comprises the following steps:

[0032] 1) Raw material preparation: The ingredients include by mass percentage: C: 0.75%, Cr: 28%, Ni: 48%, Mn: 1.5%, Si: 2.1%, Nb: 0.5%, W: 7.5%, Ti: 1.6% , the balance being Fe. , prepare the alloy according to the above mass percentage;

[0033] 2) Smelting step: All the elements except Si and Mn in the above components are melted into the alloy mother liquid by induction furnace. After the molten steel reaches 1500°C, silicon and manganese are added for deoxidation, and P and S impurities in the mother liquid are controlled. The mass percent content of the elements is all less than 0.03%, and then the molten steel is poured after the ...

Embodiment 3

[0035] The precipitation-strengthened high-carbon austenitic heat-resistant steel in this embodiment includes: C: 0.75%, Cr: 27%, Ni: 49%, Mn: 1.2%, Si: 2.4%, Nb: 1.2%, W: 7.0%, Ti: 0.9%, and the balance is Fe.

[0036] The preparation method of the present embodiment heat-resistant steel comprises the following steps:

[0037] 1) Raw material preparation: The ingredients include by mass percentage: C: 0.75%, Cr: 27%, Ni: 49%, Mn: 1.2%, Si: 2.4%, Nb: 1.2%, W: 7.0%, Ti: 0.9% , the balance is Fe, and the alloy is prepared according to the above mass percentage;

[0038] 2) Smelting step: All the elements in the above ingredients except Si and Mn are melted into the alloy mother liquor by using an induction furnace. After the alloy mother liquor reaches 1500°C, silicon and manganese are added for deoxidation, and P and S impurities in the mother liquor are controlled. The mass percent content of the elements is all less than 0.03%, and then the molten steel is poured after the ...

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Abstract

The invention discloses novel precipitation strengthening high-carbon austenitic heat-resistance steel. The steel comprises the following alloy components in percentage by mass: 0.5-0.8% of C, 24-28% of Cr, 35-50% of Ni, Co not more than 3.0%, Mn not more than 2.0%, 1.5-3.0% of Si, Nb not more than 1.0%, W not more than 7.5%, 0.5-2.5% of Ti, and the balance of Fe, wherein the Ti and Nb contents satisfy Ti / Nb not less than 0.7 and Ti+Nb not less than 2. An alloy prepared by the method eliminates coarse eutectic carbides in a cast-state alloy structure under the precondition of guaranteeing higher carbide volume fraction; and as a lot of (Nb, Ti) C are uniformly dispersed in the alloy to inhibit coarse growth of Cr23C6, the excellent effect on the alloy structure and the performance stability is achieved.

Description

technical field [0001] The invention belongs to the field of materials and material preparation, and relates to a new type of carbide precipitation-strengthened austenitic heat-resistant steel with high volume fraction and small and stable size, in particular to a precipitation-strengthened high-carbon austenitic heat-resistant steel, especially suitable for Components used for a long time under high temperature conditions, such as cracking furnace tubes and hydrogen conversion furnace tubes in ethylene production, pulverized coal burner nozzles and boiler reheaters in thermal power generation units, and centrifuges in the glass fiber industry. Background technique [0002] When the alloy is in high temperature service for a long time, the higher volume fraction of carbides is an important guarantee for the alloy to obtain good high temperature strength. At present, heat-resistant steels used at high temperatures generally have relatively high Cr and C contents. By forming l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C19/05C22C33/04C22C1/02C21D6/00C22F1/10
CPCC22C30/00C21D6/004C21D2211/001C22C1/023C22C19/055C22C19/058C22C33/04C22C38/04C22C38/34C22C38/44C22C38/48C22C38/50C22C38/52C22C38/58C22F1/10
Inventor 严靖博谷月峰袁勇赵新宝党莹樱尹宏飞杨征张醒兴
Owner HUANENG POWER INT INC
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