Title:
ULTRA-LOW-TEMPERATURE STEEL, AND HEAT TREATMENT PROCESS THEREFOR AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2023/193317
Kind Code:
A1
Abstract:
An ultra-low-temperature steel, and a heat treatment process therefor and the use thereof. The ultra-low-temperature steel comprises the following components: C: 0.41-0.45%, Mn: 23.5-24.5%, Cr: 3.5-3.7%, Cu: 0.35-0.45%, Ni: 0.55-0.65%, V: 0.20-0.24%, Mo: 0.20-0.24%, Si: 0.15-0.25%, and Al: 0.02-0.04%, with the balance being Fe and inevitable impurity elements. The ultra-low-temperature steel has a fully-austenitic structure, and has stacking fault energy at -269ºC of 18-21 mJ·m-2. By means of cooperation between a specific heat treatment process and specific components, the ultra-low-temperature steel has multiple properties of good ultra-low-temperature resistance, corrosion resistance and hydrogen damage resistance, can be applied to the storage and transportation of ultra-low-temperature media such as liquefied natural gas and liquid hydrogen, and is suitable for complex environments such as land, ocean and aviation.
Inventors:
HUANG YIXIN (CN)
QIAO MINGLIANG (CN)
SUN CHAO (CN)
ZHOU YUWEI (CN)
YAN XUQIANG (CN)
ZHANG YUANYU (CN)
QIAO MINGLIANG (CN)
SUN CHAO (CN)
ZHOU YUWEI (CN)
YAN XUQIANG (CN)
ZHANG YUANYU (CN)
Application Number:
PCT/CN2022/089480
Publication Date:
October 12, 2023
Filing Date:
April 27, 2022
Export Citation:
Assignee:
NANJING IRON & STEEL CO LTD (CN)
International Classes:
C22C38/58; C21D6/00
Domestic Patent References:
| WO2021182110A1 | 2021-09-16 |
Foreign References:
| CN110724872A | 2020-01-24 | |||
| CN106222554A | 2016-12-14 | |||
| CN103320711A | 2013-09-25 | |||
| CN107523748A | 2017-12-29 | |||
| CN108504936A | 2018-09-07 | |||
| CN103882312A | 2014-06-25 | |||
| CN107739991A | 2018-02-27 | |||
| CN110050082A | 2019-07-23 | |||
| CN112888805A | 2021-06-01 | |||
| CN107747062A | 2018-03-02 |
Attorney, Agent or Firm:
NANJING SUGAO PATENT AND TRADEMARK FIRM ( ORDINARY PARTNERSHIP ) (CN)
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