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Nickel-containing steel for use at low temperatures

A nickel steel, low temperature technology, applied in the furnace type, furnace, heat treatment furnace, etc., can solve the problem of lack of toughness, and achieve the effect of excellent toughness and high yield stress

Active Publication Date: 2020-06-05
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as a result of research conducted by the present inventors, it has been found that the 9% Ni steels and 7% Ni steels disclosed in Patent Documents 2 to 4 cannot obtain sufficient toughness at -253°C, which is the liquefaction temperature of liquid hydrogen.

Method used

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  • Nickel-containing steel for use at low temperatures
  • Nickel-containing steel for use at low temperatures
  • Nickel-containing steel for use at low temperatures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0159] Examples of the present invention are shown below. The examples shown below are examples of the present invention, and the present invention is not limited by the examples described below.

[0160] Steel was melted in a converter, and a slab having a thickness of 150 mm to 400 mm was produced by continuous casting. In Table 1 and Table 2, the chemical components of the steel materials A1 to A25 are shown. These slabs were heated, controlled rolling, water-cooled or air-cooled to 200° C. or lower as they were, and subjected to heat treatments such as reheating quenching, intermediate heat treatment, and tempering to manufacture steel sheets. After reheating and quenching, after intermediate heat treatment, and after tempering, each is water-cooled to 200° C. or lower at a cooling rate within the above-mentioned range. The heating holding time of hot rolling is 30 to 120 minutes, and the holding time of heat treatment of reheating quenching, intermediate heat treatment,...

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Abstract

This nickel-containing steel for use at low temperatures has a chemical composition comprising, in mass%, 0.020-0.070% of C, 0.03-0.30% of Si, 0.20-0.80% of Mn, 12.5-17.4% of Ni, 0.010-0.060% of Al, 0.0015-0.0060% of N, and 0.0007-0.0030% of O, and has a metallic structure which includes an austenite phase at a volumetric fraction of 2.0-30.0%, wherein, at a sheet thickness central part in a surface parallel to a rolling direction and a thickness direction, the average particle size of prior austenite grains is 3.0-20.0 [mu]m, and the average aspect ratio of the prior austenite grains is 1.0-2.9.

Description

technical field [0001] The present invention relates to nickel (Ni)-containing steel (nickel-containing steel for low temperature) suitable for applications such as tanks for storing liquid hydrogen and used mainly at low temperatures around -253°C. Background technique [0002] In recent years, expectations for utilization of liquid hydrogen as a clean energy source have increased. Austenitic stainless steel, which is less prone to brittle fracture, is used for steel plates used in tanks for storing and transporting liquefied gases such as liquid hydrogen, since excellent low-temperature toughness is required. However, although austenitic stainless steel has sufficient low-temperature toughness, the yield stress at room temperature of a general-purpose material is about 200 MPa. [0003] When applying austenitic stainless steel with a low yield stress to a liquid hydrogen tank, there is a limit to the size of the tank. In addition, if the yield stress of the steel materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00C21D8/02C22C38/54
CPCC22C38/54C22C38/001C22C38/005C22C38/02C22C38/04C22C38/06C22C38/08C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C21D8/0226C21D8/0263C21D2211/001C22C38/12C22C38/14C22C38/16C22C38/002Y02E60/32C21D8/0205C21D6/004C21D6/005C21D6/008C21D9/46
Inventor 星野学滑川哲也大宫慎一加贺谷崇之
Owner NIPPON STEEL CORP