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ASME SB-348-2017 pdf download

N OTE 1—H grade material is identical to the corresponding numeric grade (that is, Grade 2H = Grade 2) except for the higher guaranteed minimum UTS, and may always be certified as meeting the requirements of its corresponding numeric grade. Grades 2H, 7H, 16H, and 26H are intended primarily for pressure vessel use. The H grades were added in response to a user association request based on its study of over 5200 commercial Grade 2, 7, 16, and 26 test reports, where over 99 % met the 58 ksi minimum UTS. 1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 2. Referenced Documents 2.1 ASTM Standards: E8 Test Methods for Tension Testing of Metallic Materials E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications E539 Test Method forAnalysis ofTitaniumAlloys by X-Ray Fluorescence Spectrometry E1409 Test Method for Determination of Oxygen and Nitro- gen in Titanium and Titanium Alloys by the Inert Gas Fusion Technique E1447 Test Method for Determination of Hydrogen in Tita- nium and Titanium Alloys by Inert Gas Fusion Thermal Conductivity/Infrared Detection Method E1941 Test Method for Determination of Carbon in Refrac- tory and Reactive Metals and TheirAlloys by Combustion Analysis E2371 Test Method for Analysis of Titanium and Titanium Alloys by Atomic Emission Plasma Spectrometry E2626 Guide for Spectrometric Analysis of Reactive and Refractory Metals 3. Terminology 3.1 Definitions ofTerms Specific to This Standard: 3.1.1 bar, n—a hot rolled, forged, extruded or cold worked semifinished solid section product whose cross sectional area is equal to or less than 16 in. 2 (10 323 mm 2 ); rectangular bar must be less than or equal to 10 in. (254 mm) in width and greater than 0.1875 in. (4.8 mm) in thickness. Discussion—Extruded bar has been approved for use on unalloyed titanium grades 1, 2, 3 and 4 only. Other grades may be produced via the extrusion process with agreement between the producer and the purchaser. 3.1.2 billet, n—a solid semifinished section hot worked or forged from an ingot, with a cross sectional area greater than 16 in. 2 (10 323 mm 2 ) whose width is less than five times its thickness. 4. Ordering Information 4.1 Orders for material under this specification shall include the following information as applicable: 4.1.1 Grade number (Section 1),
4.1.2 Product classification (Section 3), 4.1.3 Chemistry (Table 1), 4.1.4 Mechanical properties (Table 2), 4.1.5 Marking (Section 16), 4.1.6 Finish (Section 8), 4.1.7 Packaging (Section 16), 4.1.8 Required reports (Section 15), and 4.1.9 Disposition of rejected material (Section 14). 5. Chemical Composition 5.1 The grades of titanium and titanium alloy metal covered by this specification shall conform to the requirements as to chemical composition prescribed in Table 1. 5.1.1 The elements listed in Table 1 are intentional alloy additions or elements which are inherent to the manufacture of titanium sponge, ingot or mill product. Elements other than those listed in Table 1 are deemed to be capable of occurring in the grades listed in Table 1 by and only by way of unregulated or unanalyzed scrap additions to the ingot melt. Therefore, product analysis for elements not listed in Table 1 shall not be required unless specified and shall be considered to be in excess of the intent of this specification. 5.1.2 Elements intentionally added to the melt must be identified, analyzed and reported in the chemical analysis. 5.2 When agreed upon by the producer and purchaser and requested by the purchaser in his written purchase order, chemical analysis shall be completed for specific residual elements not listed in this specification. 5.3 Product Analysis—Product analysis tolerances do not broaden the specified heat analysis requirements, but cover variations between laboratories in the measurement of chemi- cal content. The manufacturer shall not ship material which is outside the limits specified in Table 1 for the applicable grade. Product analysis limits shall be as specified in Table 3. 6. Mechanical Properties 6.1 Material supplied under this specification shall conform to the mechanical property requirements given in Table 2, as applicable. 6.2 Tension testing specimens are to be machined and tested in accordance with Test Methods E8. Tensile properties shall be determined using a strain rate of 0.003 to 0.007 in./in./min through the specified yield strength, and then increasing the rate so as to produce failure in approximately one additional minute. 7. Dimensions, Weight, and Permissible Variations 7.1 Size—Tolerances on titanium and titanium alloy mate- rial covered by this specification shall be as specified in Tables 4-11, as applicable.

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