CS 309 is a extremely alloyed austenitic chrome steel used for its wonderful oxidation resistance, high temperature power and creep resistance. The decrease nickel content material of CS309 improves resistance to sulphur attack at high temperatures. It is tough and ductile, and can be readily fabricated and machined. CS 309S is the low-carbon version of CS 309, and is beneficial for applications the place sensitisation, and subsequent corrosion by excessive temperature gases or condensates throughout shutdown may pose a problem.
Additionally, the decrease amount of carbon in its composition gives Stainless Steel 309S utilization in areas the place high temperature gases could pose a problem. As such, it’s commonly applied in the manufacturing of furnaces, exhaust techniques and containers uncovered to excessive temperatures. Alloy 309 is not designed for service in wet corrosive environments. The high carbon content material, which is current to enhance creep properties, has a detrimental impact on aqueous corrosion resistance. The alloy is prone to intergranular corrosion after long term exposure at high temperatures.
Stainless steels have good strength and good resistance to corrosion and oxidation at elevated temperatures. Stainless steels are used at temperatures as much as 1700° F for 304 and 316 and as much as 2000 F for the excessive temperature stainless grade 309(S) and as much as 2100° F for 310(S). Stainless steel is used extensively in warmth exchangers, super-heaters, boilers, feed water heaters, valves and primary steam traces as well as aircraft and aerospace applications. Heat resistant steel H20N12S2 is a chromium nickel silicon austenitic stainless-steel, grade proof against oxidation in air to a temperature of 950 °C. H20N12S2 has a chemical composition similar to H25N20S2, X15CrNiSi25 21, 1.4841.
Strength of this low-carbon alloy; nevertheless, is probably not as nice at elevated temperatures as that of the columbium (niobium)-stabilized alloys or ER309. ER 309L is preferred over ER 309 for cladding over carbon or low alloy steels, as well as for dissimilar joints that endure heat therapy. E is primarily supposed for welding heat resistant austenitic Chromium-Nickel steels of similar evaluation corresponding to AISI 309 or 309S. Also suitable for joining dissimilar metals similar to 18Cr-8Ni stainless-steel to delicate steel and welding clad surfaces of steel.
.03 max zero.03 max 0.75 max 0.75 max Alloy ER 309L is of comparable composition as ER 309 except for the carbon content material being decrease than 0.03%. This lower carbon content material reduces the potential for intergranular carbide precipitation. This increases the resistance of intergranular corrosion with out the usage of stabilizers such as columbium (niobium) or titanium.
Frequent thermal cycling reduces oxidation resistance to approximately 1850°F (1010°C). Heat-resistant steel H20N12S2 is a chromium-nickel-silicon austenitic stainless-steel, grade resistant to oxidation in air to a temperature of 950 °C. H20N12S2 has a chemical composition similar to H25N20S2, X15CrNiSi25-21, 1.4841. Alloy 253 MA / 1.4835 is a heat resistant austenitic chromium nickel stainless-steel.
Stainless Steel 309S is classed as a highly alloyed stainless steel. It accommodates much less nickel in its composition than Type 310 and a decrease carbon amount than its Type 309 counterpart. The decreased nickel allows for higher resistance against hydrogen sulfide, especially at high temperatures.
However, because of its excessive chromium content material (23%), Alloy 309 is extra corrosion resistant than most warmth resistant alloys. Alloy 309 (UNS S30900) is an austenitic stainless steel developed for use in high temperature corrosion resistance purposes. The alloy resists oxidation up to 1900°F (1038°C) underneath non-cyclic conditions.