304 Sudare

The austenitic stainless steel tubing are considered to be the most weldable of the high-alloy steel and can be sudate by all fusion and resistance sudură processes. The Alloys 304 and 304L are typical of the austenitic oțel inoxidabil.

Two important considerations in producing weld joints in the austenitic stainless steel are: preservation of rezistență la coroziune, and avoidance of cracking.

A temperature gradient is produced in the material being welded which ranges from above the melting temperature in the molten pool to ambient temperatură at some distance from the weld. The higher the carbon level of the material being welded, the greater the likelihood that the welding termice cycle will result in the chromium carbide precipitații which is detrimental to rezistență la coroziune.

To provide material at the best level of rezistență la coroziune, low carbon material (Alloy 304L) should be used for material put in service in the welded condition. Alternately, full annealing dissolves the chromium carbide and restores a high level of rezistență la coroziune to the standard carbon content materials.

Weld metal with a fully austenitic structure is more susceptible to cracking during the welding operation. For this reason, Alloys 304 and 304L are designed to resolidify with a small amount of ferită to minimize cracking susceptibility.

Aliaj 309 (23% Cr – 13.5% Ni) or nickel-base filler metals are used in joining the 18-8 austenitic alloys to oțel carbon.

Proprietăți generale
Compoziție chimică
Rezistența la coroziune
Proprietăți fizice
Proprietăți mecanice
Sudură
Tratament termic
Curățare
304/304L/304LN/304H Tuburi și țevi