Alloy 18 SR®

Description
18 SR is a titanium stabilized ferritic stainless steel that can be used for high temperature applications up to 2000˚F in dry air.  18 SR has high temperature scaling resistance superior to that of Types 409, 430, and 304 stainless steels due to the aluminum addition in this grade.  This grade has corrosion resistance, formability, and weldability similar to that of Type 439 and 441.  Typical applications include industrial ovens, furnace equipment, heat exchangers, and automotive exhaust components.

Chemical Composition
Chemical composition (wt%) limits of 18 SR*
Element 18 SR
Carbon 0.015
Chromium 18.0
Manganese 0.30
Silicon 0.60
Aluminum 2.0
Titanium 0.25
* Maximum, unless range is indicated
Mechanical Properties
Typical room temperature mechanical properties for annealed product
Property 18 SR
Yield Strength, min. (ksi) 56
Tensile Strength, min. (ksi) 78
Elongation, min. (%) 30
Hardness, max. (Rb) 84
18 SR® is a registered trademark of AK Steel Corporation
Physical Properties
Physical properties for 18 SR stainless steel
Property 18 SR
Density, lb/in3 0.27
Modulus of Elasticity, psi 29 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F 5.9 x 10-6
Thermal Conductivity, Btu/ft hr ˚F 13.2
Specific Heat, Btu/lb ˚F 0.11
Electrical Resistivity, Microohm-in 37.40-41.34

Data are typical, are provided for informational purposes, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice. We make no representation or warranty as to its accuracy and assume no duty to update. Actual data on any particular product or material may vary from those shown herein.  © 2014 RMP Inc. All rights reserved