SUS 309S

HuaNickel  SUS 309S is an austenitic heat-resistant alloy with an oxidation resistance of 1900°F at constant temperatures. When subjected to frequent thermal cycling, the alloy can resist about 1850°F. The high chromium content and relatively low nickel content of 309 provide a good high-temperature sulfur-containing atmosphere. 309 has only moderate resistance to carbon uptake and is not recommended for use in high carburizing environments. Usually in many product forms, the particle size and carbon content can meet the requirements of HuaNickel SUS 309S at the same time. Prolonged exposure to temperatures in the range of 1100-1600°F will result in the formation of some sigma, reducing ductility and impact resistance at room temperature.

SUS 309SChemical composition：

	Cr	Ni	C	P	S	Mn	Fe
Min	22	12	–	–	–	–	Bal
Max	24	15	0.08	0.45	0.03	2

SUS 309SPhysical properties：

Density	Melting point
0.285 lb/in³	2500 – 2590°F

SUS 309SMechanical properties：

Temperature, °F	70	1200	1600
Ultimate tensile strength, ksi	90	52	18
0.2% yield strength, ksi	45	22	–
Elongation, %	50	26	32

SUS 309SStainless steel characteristics：

Antioxidant 1900°F

Moderate strength at high temperatures

Easy to manufacture

Good vulcanization resistance

Good weldability

SUS 309SUses of stainless steel：

Annealing covers and boxes, carbon black, garbage incinerators, pulverized coal burners, brazing fixtures, lead bottom boilers, neutral salt tanks, mufflers, retortion columns, furnace fans and radiant tubes for aluminum and steel annealing, glass forming equipment, etc

Relevant standards：

ASTM: A 240, A 276, A 312, A 479 AMS: 5523

ASME: SA-240, SA-479, SA-312