ATI CP Grade 2

Product catalog summary

Introduction
ATI 30, CP Grade 1, ATI 40, CP Grade 2, ATI 55, CP Grade 3, and ATI 70, CP Grade 4 are commercially pure titanium grades known for their high ductility, excellent corrosion resistance, moderate strength, and good weldability. These grades are identified by their minimum yield strengths and oxygen levels. They are produced through electron beam processing or vacuum arc remelting and are used in applications such as airframe components, cryogenic vessels, and medical devices.

Specifications
The titanium grades conform to ASTM Grades I-IV, ASTM B 348 for bars and billets, AMS 4921 for bars, wire, and forgings, ASTM F 67, and ISO 5832-2 for unalloyed titanium.

Physical Properties
The melting range is 3,000-3,040°F (1,649-1,671°C) with a density of 0.163 lbs/in³ (4.51 gm/cm³). The beta transus temperatures vary slightly among the grades, ranging from 1,630°F to 1,740°F.

Heat Treatment
Annealing is performed at 1,000-1,300°F for 0.5 to 2 hours followed by air cooling. Stress relief annealing is done at 1,000-1,100°F for 30 minutes.

Hardness
Typical hardness for ATI CP Grade 2 is Rockwell B80, and for ATI CP Grade 4, it is Rockwell B100.

Forgeability/Formability
These titanium grades can be forged at 600-1,200°F with reductions of 25-40% below the beta transus. Formability at room temperature is limited, but temperatures of 400-1,000°F are used for forming operations.

Machinability
Machining is similar to austenitic stainless steels, requiring slow speeds, heavy feeds, and non-chlorinated cutting fluids.

Weldability
Welding requires precautions to prevent contamination. Fusion welding is done in inert gas environments, while spot, seam, and flash welding do not require protective atmospheres.

Special Precautions
Care must be taken to avoid hydrogen contamination during pickling and oxygen, nitrogen, and carbon pickup during processing, as these can reduce ductility and affect forming characteristics.

Catalog excerpts

ATI 30, CP Grade 1, ATI 40, CP Grade 2, ATI 55, CP Grade 3, ATI 70, CP Grade 4 Technical Data Sheet ATI 30, CP Grade 1, ATI 40, CP Grade 2, ATI 55, CP Grade 3, ATI 70, CP Grade 4 Commercially Pure Titanium (UNS R50250, R50400, R50550, R50700) INTRODUCTION ATI 30, CP Grade 1, ATI 40, CP Grade 2, ATI 55, CP Grade 3, ATI 70, CP Grade 4 or Commercially Pure, titanium grades (UNS R50250, R50400, R50550, R50700) are used where high ductility combined with excellent corrosion resistance, moderate strength, and good weldability are desired. The four grade numbers (ATI 30, 40, 55, 70) refer to the approximate minimum yield strengths for each grade. The different grades are characterized by differences in oxygen levels. These three titanium grades may be produced by single melt EB (electron beam) processing, or in a multiple melting practice with a final VAR (vacuum arc remelt). Typical product forms are billet, rolled bar, rod, and drawn wire products for applications such as airframe skin and structural components, cryogenic vessels, heat exchangers, chemical processing equipment, and medical and surgical device applications. SPECIFICATIONS • ASTM Grades I, II, III, IV (ATI 30, 40, 55, 70) • ASTM B 348 - Bars and Billets • AMS 4921 - Bars, Wire, and Forgings • ASTM F 67 - Unalloyed Titanium • ISO 5832-2 - Unalloyed Titanium HEAT TREATMENT Commercially pure titanium can be annealed by heating to 1,000 - 1,300°F (538 - 704°C) for 1/2 to 2 hours and air cooling. Stress relief annealing can be achieved by heating to 1,000 - 1,100°F (538 - 593°C) for 30 minutes followed by air cooling. HARDNESS Typical annealed hardness in the annealed condition for ATI CP Grade 2 titanium is approximately Rockwell B80 and for ATI CP Grade 4 titanium about Rockwell B100. 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 (2/21/2012): PAGE 1 of 3 Allegheny Technologies Incorporated 1000 Six PPG Place Pittsburgh,

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ATI 30, CP Grade 1, ATI 40, CP Grade 2, ATI 55, CP Grade 3, ATI 70, CP Grade 4 Technical Data Sheet FORGEABILITY/FORMABILITY Commercially pure titanium is readily finish forged from 600 - 1,200°F (316 - 649°C). Reductions of 25-40% below the Beta transus are necessary to obtain optimum properties. At room temperature CP titanium has limited formability. Temperatures from 400 to 1,000°F (204 - 538°C) are normally used for deep drawing, spinning and other forming operations. MACHINABILITY Commercially pure titanium can be machined using practices for austenitic stainless steels using slow speeds,...

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ATI 30, CP Grade 1, ATI 40, CP Grade 2, ATI 55, CP Grade 3, ATI 70, CP Grade 4 Technical Data Sheet C hem (cal Composition Ultimate Tensile Strength 0.2% Yield Reduction in Area Elongation 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 (2/21/2012): PAGE 3 of 3 Allegheny Technologies Incorporated 1000 Six PPG Place Pittsburgh, PA 15222-5479 U.S. A. www.ATImeta

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ATI CP Grade 2

ATI CP Grade 2

Catalog excerpts

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