Welding 321 Stainless Steel

The 321 H weld there is little or no corrosion or oxide attack. But T-22 is much less oxidation resistant than the stainless steels or the Incoweld A weld metal so that at the T-22weld junction an oxide wedge is beginning to form.

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Columbium stabilized stainless steels are more prone to hot cracking than titanium stabilized stainless steels.

Welding 321 stainless steel. Welding of SS 321 and SS 304. Here we are continuing the exhaust can build welding the seam using 347 filler to weld 321 stainless sheet stainshield tig gas and argon purge. 321H is to obtain the best creep strength and creep rupture strength.

Stainless Steel - Grade 321 UNS S32100 Grades 321 and 347 are the basic austenitic 188 steel Grade 304 stabilized by Titanium 321 or Niobium 347 additions. Welding 321 stainless. Fabrication Data Alloy 321 can be easily welded and processed by standard shop fabrication practices.

Alloy 321 does not perform well in chloride solutions even in small concentrations or in sulfuric acid service. ER321 is a filler metal that is made to weld Chromium-Nickel steels of similar composition. 304 has similar corrosion resistance qualities to 321 but 321 has superior mechanical properties at elevated temperatures compared to 304.

By SWP Date 11-14-2005 1536. AISI 321 stainless steel SS321 is basically type 304 with the addition of titanium Ti which stabilizes carbides against sensitization to prevent intergranular precipitation of chromium carbide when the steel is heated to a temperature within the sensitization range such as during welding. Also mentioned In Job Knowledge 103 was that the austenitic stainless steels are metallurgically simple alloys and room temperature mechanical properties are not significantly affected by variations in the welding procedure.

ER321 Stainless Steel Welding Wire. Figure 5 shows the start of an under-bead crack propagating from the oxide wedge. The austenitic stainless steels falling into the yellow area will also embrittle but this is as a result of the formation of hard brittle phases called sigma.

The problems of welding the fully ferritic steels that fall into the pink area where grain growth and embrittlement is a problem have already been dealt with in Job Knowledge No101. Sometimes 321 is chosen for its strength characteristics in which case 308 weld metal would match the strength-the same mechanical decision as with using 308 for 316 and sometimes because it is stabilized in which case 347 would be the choice. All welding on 321 is with 347 wireelectrodes due to metallurgical concerns.

These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850 C. Austenitic Types 309 and 312 may be used for dissimilar joints. 321 can be welded by all commonly used fusion and resistance methods.

Type 321 steels are usually welded with a type 347 filler. As nigel points out. Matching filler metals are available for welding Type 321 stabilized stainless steel.

Ad Improve Your Business ROI - Get A Better Deal On Welding Rod. Ad Improve Your Business ROI - Get A Better Deal On Welding Rod. For this reason Type 321 is designed to resolidify with a small amount of ferrite to minimize cracking susceptibility.

Available in multiple sizes and diameters in spool and wire rods. This data sheet applies to stainless steel 321 14541 hot and cold rolled sheet and strip semi-finished products bars rolled wire and profiles as well as seamless and welded tubes for pressure purposes. 321 should be welded using 347 filler wire.

Our standard is ER347 in welding 321 to 304 or mostly 304L. 321 stainless is basically an 188 stainless like 304 with a small addition of titanium. Machining The cold work hardening rate of 321 makes it less machinable than 410 stainless steel but similar to 304.

TP321 stainless steel is for seamless welded. Slightly tougher than 304 stainless this material will produce the same tough stringy chips. To minimize grain growth weld heat input should be minimized Preheat should be limited to 300-450F and used only for the higher carbon ferritic stainless steels eg 430 434 442 and 446.

The usage of slow speeds and constant positive feeds will minimize this alloys tendency to work harden. SS321 AISI 321 Stainless Steel 321H TP321. We have had no problems with either base or weld metal with this procedure in a very corrosive service HNO3 Organics 120C.

However increasing the oxygen and ferrite levels will reduce the toughness at cryogenic -196C temperatures. ER321 has the addition of titanium which allows for an increase in its resistance to intergranular corrosion. Weld metal with a fully austenitic structure is more susceptible to cracking during the welding operation.

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