Silver Tubes is a leading trader and manufacturer of Stainless Steel 321 Pipes/ Stainless Steel 321H Pipes, which is stabilized against chromium carbide formation by the addition of titanium. Type 321 Pipes is a titanium-stabilised version of 304, used in particular applications within the sensitizing temperature range. Type 321H Pipes is a stabilized stainless steel which offers as its main advantage an excellent resistance to intergranular corrosion following exposure to temperature in the chromium carbide precipitation range from 800 Degree F to 1500 Degree F (427 Degree C to 816 Degree C). Grade 321 Pipes is not subject to weld decay intergranular corrosion when exposed to mildly corrosive environments. Resistance to sensitization of Grade 321H Pipes, coupled with its higher strength at high temperature makes it suitable in application where it will become sensitized, or where it has insufficient hot strength.
The welded SS 321 Pipes must never be used in highly oxidizing environments as it is liable to 'Knife-line' attack. A limitation with SS 321H Pipes is that titanium does not transfer well across a high temperature arc, so is not recommended as a welding consumable. 321 Stainless Steel Pipes is a much better option in operating temperature environments in excess of 500 Degree C and therefore has its own merits. 321H Stainless Steel Pipes offers higher creep and stress rupture properties and, particularly, also be considered for exposure where sensitization and intergranular corrosion are concern.
ASTM A312 : Seamless and straight-seam welded austenitic pipe intended for high temperature and general corrosive service. Filler metal not permitted during welding.
ASTM A358 : Electric fusion welded austenitic pipe for corrosive and/or high temperature service. Typically only pipe up to 8 inch is produced to this specification. Addition of filler metal is permitted during welding.
ASTM A790 : Seamless and straight-seam welded ferritic/austenitic (duplex) pipe intended for general corrosive service, with a particular emphasis on resistance to stress corrosion cracking.
ASTM A409 : Straight-seam or spiral-seam electric fusion welded large diameter austenitic light-wall pipe in sizes 14" to 30" with walls Sch5S and Sch 10S for corrosive and/or high
ASTM A376 : Seamless austenitic pipe for high temperature applications.
ASTM A813 : Single-seam, single- or double- welded austenitic pipe for high temperature and general corrosive applications.
ASTM A814 : Cold-worked welded austenitic pipe for high temperature and general corrosive service
|SS 321||0.08 max.||2.00 max.||0.75 max.||0.045 max.||0.03 max.||17.0 – 19.0||9.0-12.0||5 x (C+N) min.||0.1|
|SS 321H||0.04 – 0.10||2.00 max.||0.75 max.||0.045 max.||0.03 max.||17.0 – 19.0||9.0-12.0||5 x (C+N) min.||0.1|
|Grade||Density||Melting Range,℃||Tensile Strength (Mpa)||Yield Strength (Mpa)||Elongation %||Hardness (Brinell)|
|SS 321 / 321H||7.92||98 - 1446||515||205||40||217|
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