Stainless Steel-310S

These grades contain 25% chromium and 20% nickel, making them highly resistant to oxidation and corrosion. Grade 310S is a lower carbon version, less prone to embrittlement and sensitisation in service.
The high chromium and medium nickel content make these steels capable for applications in reducing sulphur atmospheres containing H2S. They are widely used in moderately carburising atmospheres, as encountered in petrochemical environments. For more severe carburising atmospheres other heat resisting alloys should be selected. Grade 310 is not recommended for frequent liquid quenching as it suffers from thermal shock. The grade is often used in cryogenic applications, due to its toughness and low magnetic permeability.
Alloy 310S is an austenitic chromium nickel stainless steel that posses good oxidation resistance and strength at high temperatures in continuous service up to 2000ºF (provided reducing sulfur gasses are not present). It is also used for intermittent service at temperatures up to 1900°F because it resists rescaling and has a low coefficient of expansion. This factor reduces the tendency of the steel to warp in heat service. Alloy 310S is similar to alloy 310 except for lower carbon content to minimize carbide precipitation during welding.

Features

• Good resistance to thermal fatigue and intermittent heating at high temperatures.
• Good aqueous corrosion resistance due to high chromium content
• Excellent resistance to an oxidizing and carburizing atmosphere.
• Resists nitric acid fuming at normal temperature and fused nitrates to temperatures upwards of 425 degrees Celsius.

Heat Treatment

• 310: Anneal at 1040–1120°C followed by rapid cooling.
• 310S: Stress relieve at 870–925°C for welded components.

Machining: Use carbide tools and high-speed techniques to manage work hardening.