AK Steel 15 Cr-Cb® ULTRA FORM® Ferritic Stainless steel

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AK Steel 15 Cr-Cb® ULTRA FORM® Ferritic Stainless steel
Categories:	Metal; Ferrous Metal; Ferritic; Stainless Steel
Material Notes:	AK Steel’s 15 Cr-Cb ULTRA FORM® is a low-carbon, low-nitrogen ferritic grade of stainless steel with an intermediate, 14.5% chromium content. Alloying additions of Ti, Cb, Si and Mn provide excellent room temperature formability and impart superior hot strength and high temperature oxidation resistance when compared to Type 409, Type 439, Type 430, 11 Cr-Cb™ and Type 436. This grade’s alloying additions, combined with AK Steel’s proprietary ULTRA FORM® processing technology, yield a fine, equiaxed grain structure that enhances room temperature formability and minimizes ridging. Information provided by AK Steel
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Mechanical Properties	Original Value	Comments

Hardness, Rockwell B	78 - 85	Annealed
Tensile Strength, Ultimate	68.0 - 78.0 ksi	Annealed
	30.0 MPa @Temperature 899 °C	0.059" Coil
	46.0 MPa @Temperature 816 °C	0.059" Coil
	146 MPa @Temperature 704 °C	0.059" Coil
	359 MPa @Temperature 593 °C	0.059" Coil
Tensile Strength, Yield	45.0 - 55.0 ksi @Strain 0.2 %	Annealed
	22.0 MPa @Strain 0.2 %, Temperature 899 °C	0.059" Coil
	39.0 MPa @Strain 0.2 %, Temperature 816 °C	0.059" Coil
	110 MPa @Strain 0.2 %, Temperature 704 °C	0.059" Coil
	164 MPa @Strain 0.2 %, Temperature 593 °C	0.059" Coil
Elongation at Break	28 - 37 %	in 2 inches, Annealed

Component Elements Properties	Original Value	Comments
Carbon, C	0.010 %
Chromium, Cr	14.50 %
Iron, Fe	82.251 %	Balance
Manganese, Mn	1.0 %
Nickel, Ni	0.30 %
Niobium, Nb (Columbium, Cb)	0.35 %
Nitrogen, N	0.011 %
Phosphorus, P	0.025 %
Silicon, Si	1.3 %
Sulfur, S	0.0030 %
Titanium, Ti	0.25 %

Descriptive Properties
Delta r	0.5	Annealed
r-bar	1.3-1.6	Annealed

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NAKS088a / 139268

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