Custom 450* UNS S4500

A martinsitic precipitation hardening steel, Custom 450© stainless steel offers high strength combined with excellent corrosion resistance similar to 304 stainless in corrosion resistance with moderate strength similar to that of 410 stainless. As with most precipitation hardened alloys, Custom 450© stainless has excellent transverse properties.

Used when ease of welding and brazing in fabrication is required. Custom 450©, unlike many precipitation hardening grades, Custom 450© can be used in the annealed condition.

Applications: Valve parts, Paper mills, aircraft and power generation, chemical processing, nuclear and space craft.

Heat Treatment: Solution heat treatment, heat at 1875/1925f (1024/1052c cool to below 90f (32c) to allow material to fully martensite. Material can be air cooled, but should be rapidly quenched for best response to aging.

Aging: All solution treated materials: Condition H-900 4hrs and air cool. H-900 offers the best combination of ductility, strength and toughness. H-1150 increases ductility but decreases strength.

Chemistry Analysis
Carbon max 0.05% Manganese max 1.00%
Phosphorus max 0.03% Sulfur max 0.030%
Silicon max 1.0% Chromium   14.00 - 16.00%
Nickel   5.00-7.00% Columbium + Niobium   8 X C Minimum
Iron   Balance Molybdenum   0.50-1.00%

Corrosion Resistance

The following table is for reference only, many factors can affect the corrosive resistance, a corrosion test for each application should be applied.

Phosphoric acid Restricted Acetic Acid Moderate
Sodium Hydroxide Moderate Sea Water Restricted
Salt Spray Good Nitric Acid Good
Sulfuric Acid Restricted Humidity Excellent
Sour oil/gas Moderate    

Typical Room Temperature Tensile properties

Solution treated 1875/1925f (1024/1052c) and air cooled, followed by tempering at indicated temperature
Temper Temperature Yield 0.2% Yield 0.2% Ultimate Tensile Strength   % Elongation in 2" {50.8mm} hardness Brinell
% Reduction of Area Charpy V-notch
      0.2% offset 0.2% offset       ft-lb J
F ksi mpa ksi Mpa          
Annealed 118 814 142 978 13 28 50 98 133
H900 188 1296 196 1351 14 42 56 40 54
H950 184 1269 187 1289 16 41 58 47 64
H1000 169 1165 173 1193 17 39 63 51 69
H1050 152 1048 160 1103 20 37 66 69 94
H1150 92 634 142 979 23 28 69 97 132
Custom 450 * machines similar to other martensitic stainless steels.
AMS 5763 5773 (type 1) ASTM A564 ASTM A705 ASME SA564 ESR AMS 2300 EN10204 DIN3.1B p
Shapes Manufactured:
Flat Bars, Square Bars, Round Bars, Rings, Hollows, Discs, Blocks and special Shapes. Send us a drawing to see how we can save you material and Machining time!

*Custom 450 is a registered trademark of Cartech

The information in this data sheet is for information only and should not be used for engineering.

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