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High temperature resistant alloy and its preparation method

A high-temperature heat-resistant alloy technology, applied in the field of ferrous metal smelting, can solve the problems of high-temperature heat-resistant steel that have not yet been retrieved, and achieve the effects of reducing weight, prolonging service life, and improving high-temperature service life

Active Publication Date: 2013-05-08
辽宁瑞朗纳米新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Up to now, the inventor has not retrieved any publications in this field that use nano-ceramic composite nickel alloy instead of noble metal nickel to prepare high-temperature heat-resistant steel with a heat-resistant temperature of about 1300°C

Method used

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  • High temperature resistant alloy and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0035] To produce quenching trays, the tray weighs three tons, and the charge is distributed according to the following composition ratio (Wt%):

[0036] C: 0.22, Cr: 25, Mn: 0.89, S: 0.029, P: 0.024, Si: 1.4,

[0037] D (substitute nickel alloy): 5.0, Ni: 2.3, and the balance is iron.

[0038] Casting is carried out, and other alloy components except the D-generation nickel alloy are smelted in an electric furnace. When the temperature reaches the pouring temperature of 1620°C, pour out one-third of the molten steel and add the D-generation nickel alloy at the same time. Continue to heat and increase the 1650 ~ 1670 ℃ outlet water pouring. After annealing treatment, the mechanical properties are tensile strength 710Mpa, yield strength 560Mpa, elongation 7%, hardness HB241. After two years and seven months of use, the tray is still in good condition, without defects such as oxidation, cracking, and serious deformation.

Embodiment 2

[0040] Production of 180KW high temperature furnace bottom plate. Furnace charge according to following composition ratio (Wt%):

[0041] C: 0.24, Cr: 23, Mn: 1.0, S: 0.03, P: 0.022, Si: 1.5,

[0042] D (substitute nickel alloy): 5.40, Ni: 1.56, and the balance is iron.

[0043] The D-generation nickel alloy and other alloys are smelted in an electric furnace at the same time. When the temperature reaches 1620°C, continue heating and increase the temperature by 30-50°C to tap molten steel and pour. After finishing, heat preservation at 650-750°C for 3-5 hours for furnace cold annealing treatment, and it is still intact after more than three years of use.

Embodiment 3

[0045] Production of heat-treated material frames. Furnace charge according to following composition ratio (Wt%):

[0046] C: 0.20, Cr: 22, Mn: 1.1, S: 0.03, P: 0.022, Si: 1.6,

[0047] D (substitute nickel alloy): 4.80, Ni: 0, and the balance is iron.

[0048]The D-generation nickel alloy and other alloys are smelted in an electric furnace, and when the temperature reaches the pouring temperature of 1650°C, the molten steel is poured. After the material frame is cooled, heat it at 650-750°C for 3-5 hours for furnace cooling annealing treatment, and it is still intact after 30 months of use.

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Abstract

The invention relates to a high temperature resistant alloy and its preparation method, and concretely relates to a high temperature resistant alloy containing zero or less nickel. A nanometer ceramic composite nickel substitute alloy (nickel substitute alloy D for short) is adopted to replace isometric nickel generally used in high temperature alloys to make the alloys have a good casting performance, good mechanical performances in a casting state and a good weldability. The high temperature resistant alloy which is a steel has oxidation, carburizing and sulfuration resistances at a high temperature of 1250-1350DEG C; and compared with traditional high temperature alloys (such as ZG2Cr25Ni20Si2), the high temperature resistant alloy provided by the invention has the advantages of above 20% tensile strength increase, above 40% service life prolongation, and 30% cost reduction. The high temperature resistant alloy has a high high-temperature strength, can be widely applied to structural parts having high temperature resistance requirements, comprising heat treatment bed plates, bottom rollers, quenching normalising trays, material frames, power plant boiler high temperature burners, combustors, ash falling tubes, steel factory steel rolling rollers, guide rollers, magnesium melting reduction tanks and the like, and has the characteristics of great cost reduction and service life prolongation on the premise that use requirements are satisfied.

Description

technical field [0001] The invention relates to an alloy and a preparation method thereof, in particular to a nickel-free or nickel-less high-temperature heat-resistant alloy with a heat-resistant temperature of about 1300°C and a preparation method thereof, belonging to the technical field of ferrous metal smelting. The high-temperature heat-resistant steel provided by the present invention is widely used in steel rolling idlers, guide rollers, radiant tubes for heat treatment furnaces with controlled atmosphere, furnace bottom plates for heat treatment furnaces, heat treatment quenching, normalizing and annealing trays, and heat treatment carburizing tooling. , heat treatment material frame, burner, wind cap and burner for power boilers operating at high temperature and high pressure, ash falling pipe and magnesium smelting reduction tank and other components that need high temperature resistance. Especially in the application fields of controllable atmosphere heat treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/40C22C33/04
Inventor 曲德毅
Owner 辽宁瑞朗纳米新材料有限公司
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