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Niobium-containing austenitic stainless steel post welding heat treatment technology and fluidized bed

A post-weld heat treatment technology for austenitic stainless steel, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of troublesome disassembly and maintenance, large energy consumption, large volume of fluidized bed, etc., and achieve compact structure , Small footprint, good gathering effect

Active Publication Date: 2018-01-09
NANJING BAOSE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing fluidized bed has a large volume, consumes a large amount of energy, and most of them are integrated structures, which are troublesome to disassemble and maintain, and have poor practical effects

Method used

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  • Niobium-containing austenitic stainless steel post welding heat treatment technology and fluidized bed
  • Niobium-containing austenitic stainless steel post welding heat treatment technology and fluidized bed
  • Niobium-containing austenitic stainless steel post welding heat treatment technology and fluidized bed

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Embodiment Construction

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

[0034]A post-weld heat treatment process for niobium-containing austenitic stainless steel provided by the invention comprises the following steps:

[0035] 1) Analyze the composition and properties of niobium-containing austenitic stainless steel;

[0036] Niobium-containing austenitic stainless steel 06Cr18Ni11Nb (S34709) adds niobium as a stabilizing alloy element on the basis of austenitic stainless steel 06Cr19Ni10, and appropriately increases nickel to control the carbon content range from 0.04 to 0.10%. After solid solution treatment of solid stainless steel under heat preservation and water cooling at 1050°C and stable heat treatment at 800-900°C for 2 hours, the stabilizing element niobium and carbon form high melting point carbides and solid dissolve in austenite gra...

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Abstract

The invention discloses a niobium-containing austenitic stainless steel post welding heat treatment technology and a fluidized bed. The niobium-containing austenitic stainless steel post welding heattreatment technology comprises the following steps of: (1) analyzing the components and properties of niobium-containing austenitic stainless steel; (2) selecting and using a matched welding materialto form a welding joint having properties matched with the properties of parent metal; (3) setting appropriate post welding medium temperature heat treatment temperature and heat preservation time; and (4) carrying out medium temperature heat treatment on the niobium-containing austenitic stainless steel according to parameters. The niobium-containing austenitic stainless steel post welding heat treatment technology has the beneficial effects that the technology is simple and has relatively low requirements on devices used in the technology; the investment cost and the energy source consumption are low; after post welding heat treatment, the welding joint and the parent metal have excellent operating properties and meet related technical specifications and operating requirements.

Description

technical field [0001] The invention relates to the application field of heat treatment technology, in particular to a post-weld heat treatment technology and a fluidized bed for niobium-containing austenitic stainless steel. Background technique [0002] Ordinary chromium-nickel austenitic stainless steel has good room temperature and low temperature toughness, weldability, corrosion resistance and heat resistance. The disadvantage is that welding or long-term heating in the sensitization temperature range of 500-850 ° C will cause carbonization of chromium. When under the action of corrosive medium, preferential corrosion occurs and intergranular corrosion occurs, causing damage to welded components. Generally, austenitic stainless steel should not be heated within the sensitization temperature range. Post heat treatment. Therefore, niobium is added to 18-8 stainless steel (ordinary austenitic stainless steel) as a stabilizing element. At high temperature, niobium tends t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D9/50
Inventor 杜永勤卓夏文王书华
Owner NANJING BAOSE
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