Designation: B737 − 10 (Reapproved 2026)Standard Specif i cation forHot-Rolled and/or Cold-Finished Hafnium Rod and Wire 1This standard is issued under the f i xed designation B737; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specif i cation covers hot- or cold-worked hafniumrod and wire.1.2 This specif i cation contains two material grades, onespecif i cally for nuclear applications (Grade R1) and one forcommercial alloying applications (Grade R3).1.3 The products covered include the following:1.3.1 Rod3 ⁄ 8 in. to 1 in. (9.5 mm to 25 mm) in diameter.1.3.2 Wire less than3 ⁄ 8 in. (9.5 mm) in diameter.1.4 Unless a single unit is used, for example, corrosion massgain in mg/dm 2 , the values stated in either inch-pound or SIunits are to be regarded separately as standard. The valuesstated in each system are not exact equivalents; therefore, eachsystem must be used independently of the other. SI valuescannot be mixed with inch-pound values.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2E8/E8M Test Methods for Tension Testing of Metallic Ma-terialsE21 Test Methods for Elevated Temperature Tension Tests ofMetallic MaterialsE29 Practice for Using Signif i cant Digits in Test Data toDetermine Conformance with Specif i cationsE2626 Guide for Spectrometric Analysis of Reactive andRefractory Metals3. Terminology3.1 Def i nitions:3.1.1 rounds, f l ats, tubes, and wrought powder metallurgicalproducts (single def i nition, common to nuclear and non-nuclear standards), n—a lot shall consist of a material of thesame size, shape, condition, and f i nish produced from the sameingot or powder blend by the same reduction schedule and thesame heat treatment parameters. Unless otherwise agreedbetween manufacturer and purchaser, a lot shall be limited tothe product of an 8 h period for f i nal continuous anneal, or toa single furnace load for f i nal batch anneal.4. Ordering Information4.1 Purchase orders for material under this specif i cationshall include the following information as required to ad-equately describe the desired material:4.1.1 Quantity (weight or number of pieces),4.1.2 Name of material,4.1.3 Form (rod, wire),4.1.4 Finish (Section 12),4.1.5 Applicable dimensions (diameter and length),4.1.6 Grade (Table 1),4.1.7 ASTM designation and year of issue,4.1.8 Zirconium analysis requirements (Table 1), and4.1.9 Workmanship standards (Section 13).N OTE 1—A typical ordering description is as follows: 500 lb hafniumrod, annealed; mechanically descaled and pickled; 0.375 in. diameter by6 in. minimum random lengths; Grade R1; ASTM Specif i cationB737 – 01.4.2 In addition to the data specif i ed in 4.1, the followingoptions and points of agreement between the manufacturer andthe purchaser shall be specif i ed on the purchase order ifrequired:4.2.1 Mechanical test temperature (see 8.1),4.2.2 Mechanical test requirements for Grade R3 (Section8),4.2.3 Straightness (Table 2),4.2.4 Special tests (Section 11),4.2.5 Inspection (Section 16),1 This specif i cation is under the jurisdiction of ASTM Committee B10 onReactive and Refractory Metals and Alloys and is the direct responsibility ofSubcommittee B10.02 on Zirconium and Hafnium.Current edition approved July 1, 2026. Published July 2026. Originally approvedin 1984. Last previous edition approved in 2021 as B737 – 10 (2021). DOI:10.1520/B0737-10R26.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1
