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Austenitic stainless steel for low temperature, casting of austenitic stainless steel and manufacturing method of casting

An austenitic stainless steel, low temperature technology, applied in the field of austenitic stainless steel, can solve the problems of low thermal conductivity, no low temperature brittleness, etc., and achieve the effect of good welding performance, good low temperature impact toughness, and excellent low temperature impact performance.

Active Publication Date: 2017-06-27
FUJIAN PROVINCE DATONG RECIPROCITY VALVE CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, metal materials at low temperatures must have good plasticity and toughness, high elastic modulus, low thermal conductivity and good welding performance, that is, they must not have the problem of low temperature brittleness

Method used

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  • Austenitic stainless steel for low temperature, casting of austenitic stainless steel and manufacturing method of casting
  • Austenitic stainless steel for low temperature, casting of austenitic stainless steel and manufacturing method of casting
  • Austenitic stainless steel for low temperature, casting of austenitic stainless steel and manufacturing method of casting

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Embodiment Construction

[0041] In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail with reference to the accompanying drawings.

[0042]The embodiment of the present invention adopts, but is not limited to, austenitic stainless steel F316, which is generally used at low temperature. By increasing the nickel content and ensuring a certain content of nitrogen, the transformation point of martensite is reduced, and the austenite in the alloy is more stable. The specific plan is: an austenitic stainless steel for low temperature, which contains carbon (C): 0.08% or less, manganese (Mn): 1.0-1.6%, silicon (Si): 0.6-1.2%, chromium ( Cr): 17.0-20.0%, nickel (Ni): 10.0-13.0%, molybdenum (Mo): 2.0-3.0%, nitrogen (N): 0.04-0.12%, the rest is iron (Fe) and unavoidable impurities; Phosphorus (P) ≤ 0.04% in impurities, sulfur (S) ≤ 0.02%, tin (Sn) ≤ 0.015%, arsenic (As) ≤ 0.01%, lead (Pb) ≤ 0.01%, ant...

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Abstract

The invention provides austenitic stainless steel for low temperature, a casting of austenitic stainless steel and a manufacturing method of the casting. The austenitic stainless steel comprises lower than 0.08% of C, 1.0%-1.6% of Mn, 0.6%-1.2% of Si, 17.0%-20.0% of Cr, 10.0%-13.0% of Ni, 2.0%-3.0% of Mo, 0.04%-0.12% of N and the balance Fe and impurities; in the impurities, P is smaller than or equal to 0.04%, S is smaller than or equal to 0.02%, Sn is smaller than or equal to 0.015%, As is smaller than or equal to 0.01%, Pb is smaller than or equal to 0.01%, Sb is smaller than or equal to 0.01%, and the sum of the Sn, the As, the Pb and the Sb is smaller than or equal to 0.035%. Chemical components are adjusted, the temperature points of Ms and Md (30 / 50) are controlled, the casting process is reasonably controlled, high-nickel welding rod selection, heat treatment temperature control and the like are achieved, the stability of a cast structure is guaranteed, and the good mechanical performance and size stability are achieved.

Description

technical field [0001] The present invention relates to austenitic stainless steel, more specifically, relates to a kind of austenitic stainless steel for low temperature used in liquid gas such as liquid oxygen, liquid nitrogen, etc. at minus 196°C, castings and a manufacturing method of the castings. Background technique [0002] Generally, stainless steel can be divided into several types according to the structure: austenitic stainless steel, ferritic stainless steel, duplex stainless steel, martensitic stainless steel and precipitation hardening stainless steel; among them, precipitation hardening stainless steel is not suitable for pressure vessel weldments; other 4 types The minimum allowable temperature of stainless steel is shown in the table below. [0003] [0004] At present, stainless steel for low temperature (below minus 100°C) in the world is basically austenitic stainless steel (mainly 304 or 316 series); however, due to the pursuit of dimensional stabili...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C38/58C22C38/04C22C38/02C21C7/06C21D6/00B22C1/00
CPCB22C1/00C21C7/06C21D6/004C21D2211/001C21D2211/005C22C38/001C22C38/02C22C38/04C22C38/44C22C38/58
Inventor 姚冬花朱玮黄进东
Owner FUJIAN PROVINCE DATONG RECIPROCITY VALVE CO LTD
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