SUS 446

SUS 446 is a high chromium ferrite heat-resistant alloy with excellent resistance to oxidation, vulcanization, and other forms of hot corrosion. This grade is most commonly used between 1500-2100°F, although it has a fairly low intensity at high temperatures. SUS 446 is the only heat-resistant alloy that can withstand molten copper and brass. Like other high chromium ferritic stainless steels, in the temperature range of 700-1000°F (embrittlement at 885°F). HuaNickelSUS 446 should not be used within this temperature range unless an almost complete loss of room temperature ductility can be tolerated. Sigma embrittlement occurs with prolonged exposure in the range of 1000-1300°F. SUS 446 has a high toughness to brittle impact transition temperature. Therefore, successful forming and bending is contributing to low forming speeds, edge preparation and preheating to 250-400°F. Annealing, if necessary, should be performed at 1550-1650°F, followed by rapid cooling.

SUS 446Chemical composition：

	Cr	C	N	Mn	Si	P	S	Fe
Min	23	–	–	–	–	–	–	Bal
Max	27	0.15	0.25	1.5	1	0.04	0.03

SUS 446Physical properties：

Density	0.270 lb/in³
Melting point	2640 – 2710°F

SUS 446Mechanical properties：

Temperature, °F	70	1000	1100	1200	1300	1400
Ultimate tensile strength, ksi	68	52.7	27.7	15	10.5	5
0.2% yield strength, ksi	50	42.3	23	12	9	4
Elongation, %	30	27	65	90	113	128
Hardness, Brinell	83-93	–	–	–	–	–

SUS 446Stainless steel characteristics：

Oxidation resistance through 2000°F

Sulfur resistance

Good thermal conductivity

Resistant to molten copper and low strength

SUS 446Uses of stainless steel：

Neutral salt tank electrode

A spout for transporting molten copper alloys

Oil burner parts

combustion chamber, etc

SUS 446Process performance：

Welding process: Welding can be done using traditional methods. It is helpful to warm up and adjust to 300-600°F. Austenitic weld fillers, such as HuaNickel  AWS E310 or E312, are generally recommended to maximize the ductility of weld deposits.

Relevant standards：

ASTM: A 276, A 240