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Austenitic stainless steel and preparation method and application thereof

An austenitic stainless steel, an unavoidable technology, applied in the field of metallurgy, can solve the problems of low high-temperature mechanical properties and cannot meet the requirements, and achieve the effect of improving room temperature strength and high temperature strength

Active Publication Date: 2018-01-09
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Weak magnetic chromium-nickel type austenitic stainless steel has excellent low-temperature mechanical properties, but due to the limitation of the composition system, the high-temperature mechanical properties are generally low, and the maximum yield strength at room temperature can only be about 300MPa (corresponding to about 600MPa tensile strength)
Although this type of austenitic stainless steel can be widely used in low-temperature components of thermonuclear fusion reactors (such as correction field coil box, thermostat feeder support, etc.), it cannot meet the requirements of high-temperature and high-strength components in thermonuclear fusion reactors (such as partial Filter parts facing the plasma) requirements

Method used

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  • Austenitic stainless steel and preparation method and application thereof
  • Austenitic stainless steel and preparation method and application thereof
  • Austenitic stainless steel and preparation method and application thereof

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preparation example Construction

[0041] In the second aspect, the present invention provides a method for preparing austenitic stainless steel. The method includes: electroslag remelting of an ingot to obtain an electroslag ingot, heating the electroslag ingot, forging the electroslag ingot into a medium slab, and heating the electroslag ingot. The slabs are obtained as hot-rolled sheets and the hot-rolled sheets are annealed. Specifically, the method includes the following steps:

[0042] (1) The ingot is electroslag remelted in a protective atmosphere electroslag furnace to obtain an electroslag ingot. The ingot used in the preparation method of the present invention is made of molten iron, ferrochrome, nickel plate, ferromanganese, etc., and is smelted in a vacuum induction furnace under a nitrogen protective atmosphere, and its composition conforms to the composition of the austenitic stainless steel of the present invention .

[0043] (2) Heat the electroslag ingot to 1230°C-1280°C in a chamber-type he...

Embodiment 1

[0056] A 500kg vacuum induction furnace is used to smelt stainless steel. The ingot is electroslag remelted in a 1t protective atmosphere electroslag furnace. The electroslag ingot is heated to 1250°C in a chamber heating furnace and kept for 120 minutes. After being released from the furnace, it is upset on a free forging machine. It is a 180mm thick medium slab with a pier rough deformation rate of 30%, and the final forging temperature is 1020°C. The medium slab is heated to 1280°C in a heating furnace, kept for 120 minutes, and hot-rolled into a 50mm thick hot-rolled plate with a pass deformation rate of 12%. -15%, the final rolling temperature is 1020°C, the annealing temperature of the hot-rolled sheet is 1060°C, and the heat preservation is 70min. The annealed microstructure is a single-phase austenite structure. The chemical composition of the chromium-manganese-nickel type austenitic stainless steel for thermonuclear fusion reactor of this embodiment is shown in Table ...

Embodiment 2

[0058] Stainless steel is smelted in a 500kg vacuum induction furnace. The ingot is electroslag remelted in a 1t protective atmosphere electroslag furnace. The electroslag ingot is heated to 1230°C in a chamber heating furnace and kept for 150 minutes. After being released from the furnace, it is upset on a free forging machine. It is a 160mm thick medium slab with a pier rough deformation rate of 25%, and the final forging temperature is 1000°C. The medium slab is heated to 1290°C in a heating furnace, kept for 90 minutes, and hot-rolled into a 30mm thick hot-rolled plate with a pass deformation rate of 10%. -13%, the final rolling temperature is 1000°C, the annealing temperature of the hot-rolled sheet is 1055°C, and the heat preservation is 90min. The chemical composition of the chromium-manganese-nickel type austenitic stainless steel used in the thermonuclear fusion reactor of this embodiment is shown in Table 1, and the relative magnetic permeability and mechanical proper...

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Abstract

The invention provides austenitic stainless steel. The austenitic stainless steel comprises, by weight percentage, 0.02-0.04% of carbon, 0.7-1.0% of silicon, 5.0-7.0% of manganese, 20.5-22.5% of chromium, 12.5-14.5% of nickel, 1.50-2.50% of molybdenum, 0.25-0.30% of nitrogen, 0.20-0.40% of niobium, smaller than or equal to 0.03% of phosphorus, smaller than or equal to 0.01% of sulfur and the balance Fe and inevitable impurities. The invention further provides a preparation method of the austenitic stainless steel. The preparation method of the austenitic stainless steel includes the steps thatcast ingots are subjected to electroslag refusing so that electroslag ingots can be obtained, the electroslag ingots are heated and are forged into middle plate blanks, the middle plate blanks are heated so that hot rolled plates can be obtained, and the hot rolled plates are subjected to annealing. The room temperature strength and the high temperature strength of the austenitic stainless steelare remarkably improved while the weak magnetism of steel grades are kept, and the austenitic stainless steel can be used as a structural material of a thermonuclear fusion pile.

Description

technical field [0001] The invention belongs to the field of metallurgy. Specifically, the invention relates to a chromium-manganese-nickel type austenitic stainless steel material for a thermonuclear fusion reactor and a preparation method thereof. Background technique [0002] Thermonuclear fusion reactors need to confine deuterium and tritium nuclei under strong magnetic field conditions to achieve controlled thermonuclear fusion reactions. Chromium-nickel austenitic stainless steel represented by 304L, 316L and 316LN is usually used as the main structure Material. After the composition of the austenitic stainless steel is optimized, the relative magnetic permeability can reach below 1.03, which fully meets the weak magnetic requirements of the thermonuclear fusion reactor for structural materials. [0003] Weak magnetic chromium-nickel type austenitic stainless steel has excellent low-temperature mechanical properties, but due to the limitation of the composition system...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/58C22C38/44C22C38/48C21D8/02C21D1/26
Inventor 舒玮尹嵬刘承志
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD