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Ferritic stainless steel material for brazing, and heat exchanger member

A heat exchanger, stainless steel technology, used in heat exchange equipment, heat exchangers, heat exchanger shells, etc., to achieve excellent thermal fatigue characteristics and prevent coarse graining.

Active Publication Date: 2013-10-16
NIPPON STEEL STAINLESS STEEL CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

High temperature strength is also expected to be further improved

Method used

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  • Ferritic stainless steel material for brazing, and heat exchanger member
  • Ferritic stainless steel material for brazing, and heat exchanger member
  • Ferritic stainless steel material for brazing, and heat exchanger member

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Embodiment

[0054] Steels having the chemical compositions shown in Table 1 were smelted, and the resulting ingots were hot-forged into round bars and plates, and processed into round bars with a diameter of 15 mm and plates with a thickness of 30 mm. The holding temperature was set in the range of 1000 to 1100° C., and solution treatment was performed on the round bar. The plate is made into a hot-rolled plate with a thickness of 4 mm by hot rolling, and after annealing treatment, it is made into a plate with a thickness of 1 mm by cold rolling. Then, the holding temperature is set in the range of 850 to 1100 ° C, and recrystallization is carried out. Heat treatment as a final anneal yields materials with various recrystallization rates. Thereafter, a part of the material was removed, and cold rolling was carried out at a light working rate (described in Table 2) at which grain coarsening tends to occur during high-temperature brazing to prepare test steel sheets. In addition, Steel No....

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Abstract

[Problems] To provide a ferritic stainless steel in which grain coarsening is prevented in the case that the stainless steel is exposed to high temperature brazing as a heat exchanger member. [Means for Resolution] A ferritic stainless steel material for brazing, having partially recrystallized structure and composition including, in % by mass, C:0.03% or less, Si: more than 0.1 to 3%, Mn: 0.1 to 2%, Cr: 10 to 35%, Nb: 0.2 to 0.8%, N: 0.03% or less, if necessary, at least one of Mo, Cu, V and W: 4% or less in total, at least one of Ti and Zr: 0.5% or less in total, at least one of Ni and Co: 5% or less in total, or at least one of A1: 6% or less, REM (rare earth metal): 0.2% or less and Ca: 0.1% or less, the remainder being Fe and unavoidable impurities, wherein area ratio in percentage of recrystallized grains formed by heating after cold working is from 10 to 80%.

Description

technical field [0001] The present invention relates to a ferritic stainless steel material suitable for heat exchanger parts and a heat exchanger part subjected to brazing using the same, to which high temperature brazing such as nickel brazing is applied. Background technique [0002] In vehicles equipped with internal combustion engines, mainly automobiles, in order to reduce NO in exhaust x In order to avoid the increase of fuel cost, the EGR (Exhaust Gas Recirculation: Exhaust Gas Recirculation) method is often used. This is a technology that takes out a part of the exhaust gas discharged from the internal combustion engine and re-intakes it from the intake side of the internal combustion engine. It has been widely used mainly in diesel engines, but it has also been used in gasoline engines in recent years. [0003] In an EGR system, means are required to cool the exhaust gas to a temperature at which it can be circulated. This is the EGR cooler. [0004] In addition...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00B23K35/30C22C38/38C22C38/58F28F9/18F28F21/08C22C19/03
CPCF28D7/16B23K35/308C22C38/26F28F1/12C21D6/002C22C38/02F28D21/0003C21D8/0273F28F21/089C22C38/04C22C38/20B23K2201/14C22C38/001F28F21/083B23K2101/14C22C38/34C22C38/38
Inventor 奥学中村定幸堀芳明
Owner NIPPON STEEL STAINLESS STEEL CORP
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