Compared with austenitic series stainless steel JISG4304 SUS 304, ferrite series stainless steel JISG4304 SUS 430 is cost-effective for corrosion resistance, good heat thermal conductivity, small coefficient of thermal expansion, and less stress. Various types of excellent properties such as corrosion corrosion (Fress Corrosion Cracking), ferrite series stainless steel JISG4304 SUS 430 is used in automotive exhaust system components, roofing, doors and windows, building materials, kitchens, water storage tanks, hot water tanks, etc. Wide range of uses such as materials.
When these structures are produced, the stainless steel sheets are often cut and formed into an appropriate shape, and then joined by welding. However, since the C and N solid solubility limits of the ferrite series stainless steel JISG4304 SUS 430 are small, Cr carbonitride is generated in the welded portion due to deuteration and solidification by welding. A phenomenon known as sensitization is formed by forming a depletion layer and easily causing a decrease in corrosion resistance.
Therefore, a method of suppressing the generation of Cr carbonitride by suppressing the formation of Cr carbonitride by adding Ti or Nb having an affinity for carbon and nitrogen to Cr is suppressed.
However, in recent years, with the complication of the shape of the welded member, the welding is not performed under the incomplete condition in which insufficient nitrogen gas is prevented from being welded at the time of welding, and nitrogen in the air is mixed into the shielding gas. Next, since nitrogen enters the weld by the shielding gas, sensitization of the welded portion is more likely to occur.
Katalor supply austenitic series stainless steel JISG4304 SUS 304 and ferrite series stainless steel SUS 430. any question of ferrite series stainless steel SUS 430 and austenitic series stainless steel JISG4304 SUS 304 is welcomed to send to katalor.