ASTM A312 Tp321/Tp321h Stainless Steel Seamless Pipe/Tube

321 (UNS S32100) is titanium stabilized austenitic stainless steel plate with good general corrosion resistance. It has
excellent resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range
of 800 - 1500°F (427 - 816°C). The alloy resists oxidation to 1500°F (816°C) and has higher creep and stress rupture
properties than alloys 304 and 304L. It also possesses good low temperature toughness.
Alloy 321H (UNS S 32109) stainless steel plate is the higher carbon (0.04 - 0.10) version of the alloy. It was developed for
enhanced creep resistance and for higher strength at temperatures above 1000oF (537°C). In most instances, the carbon
content of the plate enables dual certification.
Alloy 321 stainless steel plate cannot be hardened by heat treatment, only by cold working. It can be easily welded and
processed by standard shop fabrication practices.
Alloy 321 stainless steel plate exhibits good general corrosion resistance that is comparable to 304. It was developed for
use in the chromium carbide precipitation range of 1800 - 1500°F here un-stabilized alloys such as 304 are subject to
intergranular attack.The alloy can be used in most diluted organic acids at moderate temperatures and in pure phosphoric
acid at lower temperatures and up to 10% diluted solutions at elevated temperatures. Alloy 321 resists polythionic acid
stress corrosion cracking in hydrocarbon service. It can also be utilized in chloride or fluoride free caustic solutions at
moderate temperatures.Alloy 321 stainless steel plate does not perform well in chloride solutions, even in small concentrations,
or in sulfuric acid service.