Brazing articles of stainless steel, e.g. large heat exchanger involves applying an iron-based brazing filler material to parts of stainless steel, heating the parts, and providing brazed areas with specific average hardness

摘要

Brazing articles of stainless steel involves applying an iron-based brazing filler material to parts of stainless steel; optionally assembling the parts; heating the parts to at least 1000[deg]C in a non-oxidizing atmosphere, a reducing atmosphere and/or vacuum, and heating the parts to at least 1000[deg]C for at least 15 minutes; providing articles having an average hardness of less than 600 HV1 of the obtained brazed areas; and optionally repeating one or more of applying step, assembling step and heating step. An independent claim is also included for a brazed article of stainless steel comprising at least one base material of stainless steel and an iron-based brazing filler material. The obtained brazed areas, pores, cracks, gaps, joints, or crevices have a tensile strength of at least 110 N/mm 2 and an average hardness of less than 600 HV1.