446 is a high chromium ferritic heat resistant alloy with excellent resistance to oxidation, sulfidation and other forms of hot corrosion. 446 has a high ductile-to-brittle impact transition temperature.

Features

Oxidation resistance through 2000°F

Sulfidation resistance

Good thermal conductivity

Resistance to molten copper

Low strength

Applications

Neutral salt pot electrodes

Recuperators

Spouts for conveying molten copper alloys

Oil burner parts

Combustion chambers

Furnace and kiln linings

Stack dampers

Boiler baffles

Equivalent

STANDARD	WERKSTOFF NR.	UNS	JIS
SS 446	1.4762	S44600	SUS 446

Composition

Grade		C	Mn	Si	P	S	Cr	Ni	N
446	min.	–	–	–	–	–	23.0	–	0.10
	max.	0.20	1.5	0.75	0.040	0.030	30.0	0.50	0.25

Mechanical properties

Grade	Tensile Strength (MPa) min	Yield Strength 0.2% Proof (MPa) min	Elongation (% in 50mm) min	Hardness
				Rockwell B (HR B) max	Brinell (HB) max
446	485	275	20	92	201

Sizes

Hot Rolled Process – OD 30-500mm ; WT 3-60mm ; L 6-12meter

Cold Drawn Process – OD 10-200mm ; WT 0.5-20mm ; L 1-12meter

Cold Rolled Process – OD 6-200mm ; WT 0.1-20mm ; L 1-12meter

Surface

Acid pickling – pre-passivation process of treating stainless steel parts with an acid solution, typically hydrochloric or sulfuric acid, which can remove oxide scale and heat tint while dissolving steel flecks embedded in the part.

Polishing – P grade sandpaper: P150, P200, P250, P300, P400, P500, P600, P700, P800

Inspection

Chamical analysis / Tensile test at room temperature / flattening test / ring tensile test / drift expemdomg test / ring expanding test / leak tightness test / Tensile test at elevated temperature / impact test at room temperature / impact test at low temperature / eddy current test / ultrasonic test / magnetic flux leakage test

Machinability

Machinability of the grade 446 stainless steel is possible at slow speeds with positive feeds, rigid mounts and sharp tooling surfaces.

Welding

The grade 446 stainless steel can be easily welded using most of the traditional methods except oxyacetylene welding. Type 308 welding material can be used if required, but it will not exhibit scaling resistance equal to the base metal. Differences in coefficient of thermal expansion of base and weld metal has to be taken into consideration.