Metal material having good resistance to metal dusting

A metal material, anti-metal technology, applied in the field of metal pipes, can solve the problems of no longer existing effect, no metal material, use restrictions, etc., and achieve the effect of good resistance to metal powder

Inactive Publication Date: 2003-12-24
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only effective in the initial stage. After long-term use, once the thin layer is peeled off, the effect will no longer exist.
[0008] In addition, it has been considered to add H to the atmospheric gas 2 S method, but H 2 S has the potential to reduce the activity of catalysts used for hydrocarbon upgrading, so its use is limited
As mentioned above, although various studies have been conducted, no metal material capable of sufficiently suppressing metal dusting has been obtained yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] Use a high-frequency heating vacuum furnace to melt the metal materials with the chemical compositions shown in Table 1 and Table 2, and use conventional methods for forging, hot rolling and cold rolling to make plates with a thickness of 6 mm, and then perform solution heat treatment at 1150 °C , to make a test piece with a thickness of 4mm, a width of 10mm, and a length of 20mm.

[0133] Using the test pieces of each metal material obtained, the volume ratio is 58%H 2 -40%CO-2%H 2 The test was carried out by maintaining in an atmosphere of O and at a temperature of 600° C. for 4 weeks.

[0134] Then, deposits on the surface of the test piece were removed, weighed, and the corrosion loss was calculated from the difference from the mass before the test. Then observe the cross-sectional structure of the test piece with an optical microscope to measure the depth of the carburized layer.

[0135] The metal dusting resistance was evaluated based on the corrosion decremen...

Embodiment 2

[0141] Use a high-frequency heating vacuum furnace to smelt metal materials with chemical compositions shown in Table 4-11.

[0142] On the ingots of the above-mentioned metal materials, a test piece with a diameter of 10 mm and a length of 110 mm at the parallel part was cut from the surface layer to the inside at a distance of 20 mm, and was heated to 1150 ° C in an Ar atmosphere using a Gleb test base, and then Cooling at 100°C / min to 900°C, at 900°C for 5 seconds -1 High temperature tensile tests were carried out at the strain rate to investigate its hot workability. The heating range of the test piece is 36 mm, and the He gas is used for rapid cooling immediately after the high temperature tensile test.

[0143] The hot workability was evaluated by the reduction of area (%) in the above high temperature tensile test. Judging from experience, when the value is 50% or more, there is hot workability that does not hinder product manufacture.

[0144] In addition, the ingot...

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PUM

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Abstract

A metal material, which has a chemical composition in mass %; C: 0.2 % or less, Si: 0.01 to 4 %, Mn: 0.05 to 2 %, P: 0.04 % or less, S: 0.015 % or less, Cr: 10 to 35 %, Ni: 30 to 78 %, Al: not less than 0.005 % and less than 4.5 %, N: 0.005 to 0.2 %, at least one of Cu: 0.015 to 3 % and Co: 0.015 to 3 % and balance: substantially Fe, wherein the value of [40S + Ni + 5Al + 40N + 10(Cu + Co)] is 50 or more where an elemental symbol represents the content in mass % of each element. The metal material exhibits excellent corrosion resistance in a circumstance wherein a conventional material is prone to metal dusting, and thus can be used for a heating furnace tube, a piping, a heat exchanger tube and the like in a petroleum refiner, a petrochemical plant and the like, and can significantly improve the durability and safety of an apparatus.

Description

technical field [0001] The present invention relates to high Cr-high Ni-Fe alloys used in containers, reaction tubes, parts, etc. exposed to high-temperature atmospheres in heat-exchange hydrocarbon upgrading devices such as petroleum refining and petrochemical devices, waste heat recovery devices, etc. Metal materials, multi-layer metal materials and metal tubes made of them. Background technique [0002] In the future, the demand for gases such as hydrogen and methanol as clean energy fuels is expected to increase significantly. Therefore, hydrocarbon reforming equipment is required to be larger, have higher thermal efficiency, and be suitable for mass production. In addition, conventional petroleum refining and petrochemical facilities, etc., hydrocarbon reforming units, ammonia production units and hydrogen production units using petroleum as raw materials, often use heat exchange to recover waste heat in order to improve energy efficiency. [0003] In order to fully an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/01C22C19/05C22C30/00C22C38/00C22C38/02C22C38/04C22C38/06C22C38/34C22C38/40C22C38/42C22C38/52C22C38/58F28F19/06F28F21/08
CPCC22C30/00F28F21/087C22C38/34C22C38/005C22C38/04F28F19/06C22C38/40C22C19/058C22C38/42C22C38/06C22C38/02B32B15/01C22C38/52C22C38/001C22C19/055Y10T428/12979Y10T428/12653Y10T428/12937Y10T428/12972Y10T428/12493Y10T428/12646Y10T428/12951Y10T428/12958Y10T428/12944Y10T428/12965Y10T428/12639Y02P20/10
Inventor 西山佳孝大塚伸夫
Owner NIPPON STEEL CORP
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