ATI 13-8 Supertough® A
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ATI 13-8 Supertough® Technical Data Sheet ATI 13-8 Supertough Alloy (UNS S13800) is a modification of the standard ATI 13-8 alloy, and has superior fracture toughness and Charpy impact energies, even at cryogenic temperatures. These improvements have been achieved with tighter chemistry controls and thermo-mechanical processing practices. This improved alloy is a martensitic precipitation-hardening stainless steel that has excellent strength, high hardness, and good corrosion resistance. Transverse fracture toughness properties of 120 ksi/in. minimum in the H1000 condition is achieved by tight chemical composition control, low carbon content, and double vacuum melting. The alloy is produced by vacuum induction melting (VIM), followed by vacuum arc remelting (VAR).This melt practice ensures excellent macro and micro-cleanliness, and tight compositional control. The strengthening mechanism (precipitation hardening in a martensitic matrix) makes it possible to achieve uniform strengthening in heavy sections. Strength and ductility levels can be ® tailored to the application by varying the aging temperature. ATI 13-8 Supertough Alloy is available as ingot, billet, block, round bar, rolled shapes and rectangles, rolled and drawn rod, and wire. Typical applications are large airframe structural components. SPECIFICATIONS • AMS 5934 - Bars, forgings, rings, and extrusions • AMS 5629 - Bars, forgings, rings, and extrusions • AMS 5864 - Plate PHYSICAL PROPERTIES Melting Range: 2,560 to 2,680°F (1,404 to 1,471°C) 3 Density: 0.279 lbs/in (7.76 gm/cc) HEAT TREATMENT Solution treatment from 1,675 to 1,725°F (913 to 941°C) for 15 to 30 minutes at temperature. Air cool or oil quench to below 60°F (15°C) to ensure complete transformation to martensite. Aging is normally carried out from 950 to 1,150°F (510 to 621°C), depending upon the desired final properties. Heat treatment is usually performed in air. Heat treatment of brazed components may be done in inert atmospheres. Reducing atmospheres should not be used because of the potential for nitrogen contamination. HARDNESS Hardness in the solution annealed condition is approximately Rockwell C 33. See the attached table for hardness in the various aged conditions. OXIDATION RESISTANCE Data are typical and should not be construed as maximum or minimum values for specification or for final design. Data on any particular piece of material may vary from those herein. U.S. and foreign patents; other patents pending. © 2011 ATI. All rights reserved. VERSION 1 (12/29/2011): PAGE 1 of 5 Allegheny Technologies Incorporated 1000 Six PPG Place Pittsburgh, PA 15222-5479 U.S.A. w

ATI 13-8 Supertough® Technical Data Sheet ATI 13-8 Supertough® Alloy has excellent oxidation resistance up to 1,500°F (816°C). Resistance to stress corrosion improves as aging temperature increases. Experimental data demonstrate that the stress corrosion resistance is significantly better than that of ’standard’ 13-8 alloy. This alloy has the best resistance to stress corrosion cracking of all of the precipitation hardenable stainless steels. Its resistance to general corrosion is greatest in the fully-hardened condition. The alloy shows very little rusting when exposed to a 5 percent salt...

ATI 13-8 Supertough®.Technical Data Sheet Chemical Composition A$TM Dll 41 synthetic seawater at room temperature 1A5TM G59-97 2 ASTM G5-94 Data are typical and should not be construed as maximum or minimum values for specification or for final design. Data on any particular piece of material may vary from those herein. U.S. and foreign patents; other patents pending. © 2011 ATI. All rights reserved. VERSION 1 (12/29/2011): PAGE 3 of 5 Allegheny Technologies Incorporated 1000 Six PPG Place Pittsburgh, PA 15222-5479 U.S. A. www.ATImetals.com

Fatigue Crack Growth Rate HI000 Condition ATI 13-8 Supertough®Time to 0.2 % Creep Deformation For Bar At Elevated Temperatures 15.0 Test Conditions Room Temperature Thermal Conductivity 700? F 1 ui. c Time to Rupture For Bar At Elevated Temperatures -A-' Data are typical and should not be construed as maximum or minimum values for specification or for final design. Data on any particular piece of material may vary from those herein. U.S. and foreign patents; other patents pending. © 2011 ATI. All rights reserved. VERSION 1 (12/29/2011): PAGE 4 of 5 Allegheny Technologies Incorporated 1000...

.Technical Data Sheet Temperature Dependence Of Fracture Toughness Uniaxial Stress Control Fatigue HI000 Condition ASTM Room lemperalure Smooth Uniaxial Fatigue 30Hz sinusoidal wavelorm Tests discontinued at 10,000 000 cycles 100,000 1,000,000 10,000,000 100,000,000 Cycles to Failure I 3-9 Allay Strain Control-Low Cycle Fatigue HI000 Condition Compression and Tensile Modulus vs Temperature Test Temperature Elastic Modules (Msil Room Temperature Triangular wave form Allegheny Technologies Incorporated 1000 Six PPG Place Pittsburgh, PA 15222-5479 U.S. A. www.ATImetals.com Data are typical and...