AK Steel 18 Cr-Cb™ Ferritic Stainless steel

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AK Steel 18 Cr-Cb™ Ferritic Stainless steel
Categories:	Metal; Ferrous Metal; Ferritic; Stainless Steel
Material Notes:	AK Steel 18 Cr-Cb™ provides a more effective solution than Type 409 to many automotive exhaust applications, due to its higher oxidation resistance, improved creep resistance and moderate formability. AK Steel 18 Cr-Cb™ is a ferritic stainless steel that is stabilized with titanium and columbium. When given a high temperature final solution anneal, the alloy exhibits dramatic creep resistance. The dual stabilization prevents carbide sensitization during welding and high-temperature exposure, and makes the alloy thermally non-hardenable. Potential applications include exhaust system catalytic converters, mufflers and pipes; heat exchangers and heat exchanger tubing; and nonstructural furnace parts. ASTM Grain Size = 5 - 7. Information provided by AK Steel
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Physical Properties	Metric	English	Comments

Density	7.65 g/cc	0.276 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	<= 88	<= 88	Specification
Tensile Strength, Ultimate	>= 414 MPa	>= 60000 psi	Specification
	462 - 517 MPa	67000 - 75000 psi	Typical
Tensile Strength, Yield	>= 262 MPa @Strain 0.2 %	>= 38000 psi @Strain 0.2 %	Specification
	303 - 359 MPa @Strain 0.2 %	43900 - 52100 psi @Strain 0.2 %	Typical
Elongation at Break	>= 25 %	>= 25 %	in 2 inches, Specification
	30 - 38 %	30 - 38 %	in 2 inches, Typical

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.00002329 ohm-cm	0.00002329 ohm-cm

Component Elements Properties	Metric	English	Comments
Carbon, C	0.020 %	0.020 %
Chromium, Cr	18 %	18 %
Iron, Fe	80.43 %	80.43 %	As Remainder
Manganese, Mn	0.30 %	0.30 %
Niobium, Nb (Columbium, Cb)	0.55 %	0.55 %
Silicon, Si	0.45 %	0.45 %
Titanium, Ti	0.25 %	0.25 %

Descriptive Properties
Strain Hardening Exponent n	0.18

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NAKS090 / 14693

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