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Stainless Steel 347

Type 347 stainless steel has slightly improved corrosion resistance over type 321 stainless steel in strongly oxidizing environments. Type 347 is stabilized with columbium, it is preferable for aqueous and low temperature environments due to its good resistance to intergranular attack. Both 347 and 321 offer good resistance to polythionic acid stress corrosion cracking, encountered in oil refineries. The high temperature oxidation resistance of 347 is similar to that of 304 stainless steel. Useful to 1500°F.

In what form is Stainless Steel 347 available at ISHWAR STEEL CORPORATION?

Chemistry Composition,%

Bar
Wire
Sheet
Plate
Forgings
Pipe
Flanges

Chemistry Composition,%

	Cr	Ni	Cb + Ta	C	Si	Mn	P	S	Fe
MIN	17.0	9.0	Cb 10xc (Cb 8xC)	0.04	-	-		-	-
MAX	19.0	13.0	1.0	0.08	0.75	2.0	0.045	0.03	Balance

Features

Good creep strength up to 1500°F
Maintains good corrosion resistance in applications where the temperature is between 800°F and 1500°F.
Good resistance to intergranular corrosion in the as welded condition.

What applications might 347 Stainless Steel be used?

Oil Refineries
Fluid catalytic cracking units (FCC)
Hanger rods
Recuperator tube sheets, shell, supports
Especially where temperatures exceed 550°F and resistance to sulfidation is needed
Fired heater tubes
Distributor trays and thermowells
Equipment in and around reactors (good resistance to polythionic acid)

Mechanical Properties>

Minimum Specified Properties, ASTM A 240

Tensile Strength, ksi	75
0.2% Yield Strength, ksi	30
Elongation, %	40
Hardness Max, Brinell	201

Typical Tensile and Impact Properties

Temperature, °F	68	400	800	1000	1200	1350	1500
Ultimate Tensile Strength, ksi	93.3	73.6	69.5	63.5	52.3	39.3	26.4
0.2% Yield Strength, ksi	36.5	36.6	29.7	27.4	24.5	22.8	18.6