ASTM B737-10 (2021) PDF

Full title and description

Designation: ASTM B737-10 (Reapproved 2021) — Standard Specification for Hot-Rolled and/or Cold-Finished Hafnium Rod and Wire. The specification defines material grades, chemical and (where applicable) mechanical requirements, manufacturing and finish options, sampling and test methods for wrought hafnium rod and wire.

Abstract

This specification covers hot- and/or cold-worked hafnium rods and wires in two grades (Grade R1 for nuclear applications and Grade R3 for commercial/ alloying applications). It specifies production by vacuum melting (electron-beam or consumable-arc furnaces), sampling practices, chemical limits, dimensional ranges (rod diameters ~3/8 to 1 in; wire under 3/8 in), surface finishes, and required corrosion testing in water. Mechanical-property requirements apply to rod forms but do not apply to wire unless otherwise agreed.

General information

• Status: Published / current (reapproved edition 2021).
• Publication date: Approved April 1, 2021; published April 2021 (document metadata also lists 31-Mar-2021).
• Publisher: ASTM International (Committee B10, Subcommittee B10.02 responsible).
• ICS / categories: Materials and metallurgy — Metals and alloys; typically classified under ICS area 77 (non‑ferrous and specialty metals / alloys). (ICS grouping for metals shown under ICS 77 listings).
• Edition / version: B737-10 (Reapproved 2021). Original adoption 1984; last previous edition noted as B737–10 (2015) before reapproval.
• Number of pages: Approximately 4 pages (published short specification).

Scope

Specifies requirements for hot‑rolled and/or cold‑finished hafnium rod (≈3/8 to 1 in / 9.5 to 25 mm) and wire (less than 3/8 in / 9.5 mm). Contains two material grades (R1 for nuclear applications and R3 for commercial alloying uses), and defines metallurgical condition (recrystallization annealed unless otherwise specified), permitted impurities, sampling locations (top/middle/bottom of ingots), allowable finishes, dimensional tolerances and corrosion test conditions.

Key topics and requirements

• Grades: Grade R1 (nuclear) and Grade R3 (commercial/alloying) with different impurity limits and test requirements.
• Chemical composition: Maximum impurity limits for many elements (Al, C, Cr, Fe, O, N, H, Si, Ti, etc.) and zirconium content controls; manufacturer’s ingot analysis accepted for most elements while H and N are measured on finished product.
• Manufacture: Material produced from vacuum‑melted ingots (electron‑beam or consumable‑arc furnaces) and worked by conventional hot/cold rolling or drawing.
• Mechanical properties: Requirements apply to rod (room‑temperature and, if ordered, elevated‑temperature tests); requirements do not apply to wire unless specified.
• Corrosion testing: Water corrosion tests (example: 360 °C, 2690 psi, 672 h test parameters noted for Grade R1) with specified allowable mass gain for nuclear grade.
• Finishes and delivery: Rods—mechanically descaled & pickled, centerless ground & pickled, or centerless ground/pickled/oxidized; wires—conditioned & pickled, or conditioned/pickled/oxidized.
• Ordering/inspection: Purchase order items and options to specify include quantity, form, finish, dimensions, grade, special tests, straightness and certification requirements.

Typical use and users

Primary users and applications include hafnium producers and mills, suppliers of specialty refractory/reactive metals, manufacturers of control‑rod components for nuclear reactors (Grade R1), alloy producers and research laboratories requiring high‑purity hafnium for evaporation/sputtering targets, and aerospace/advanced engineering applications where hafnium’s corrosion or high‑temperature properties are required. Commercial suppliers commonly reference ASTM B737 when specifying product chemistry and finish.

Related standards

Referenced ASTM standards and test methods commonly cited in B737 include Practice E29 (rounding / significant digits), Test Methods E8 (tension testing), E21 (elevated temperature tensile testing), and others relevant to spectrometric analysis and reactive/refractory metals. The specification also cross‑references ordering and inspection practices and may reference withdrawn or related guides for spectrometric analysis.

Keywords

hafnium; hafnium rod; hafnium wire; hot‑rolled; cold‑finished; Grade R1; Grade R3; nuclear grade; alloying grade; vacuum melting; electron‑beam; consumable‑arc; corrosion test; ASTM B737; reactive/refractory metals.

FAQ

Q: What is this standard?

A: ASTM B737-10 (Reapproved 2021) is the ASTM International specification that sets chemical, metallurgical and certain mechanical and corrosion‑test requirements for hot‑rolled and/or cold‑finished hafnium rod and wire.

Q: What does it cover?

A: It covers two grades of wrought hafnium (R1 for nuclear use, R3 for commercial/alloying), manufacturing origin (vacuum‑melted ingots), chemical impurity limits, dimensional ranges, finishing options, sampling and test methods, and corrosion testing requirements; mechanical property requirements apply to rods.

Q: Who typically uses it?

A: Hafnium producers and processors, purchasers specifying raw hafnium rod/wire for nuclear or alloying uses, suppliers of specialty metals, and laboratories and OEMs in nuclear, aerospace, electronics (sputtering/evaporation targets) and research sectors.

Q: Is it current or superseded?

A: The edition is B737-10 (Reapproved 2021) and is listed as the current/reapproved 2021 text; the standard traces to original approval in 1984 with earlier editions and reapprovals (previous noted edition 2015). For any amendments or revision work items, ASTM work‑item records should be consulted.

Q: Is it part of a series?

A: It is part of ASTM’s family of B‑series standards covering nonferrous metals and alloys and falls under the jurisdiction of ASTM Committee B10 (Reactive and Refractory Metals and Alloys), Subcommittee B10.02 (Zirconium and Hafnium). Related ASTM test methods and practices (E8, E21, E29, etc.) are referenced.

Q: What are the key keywords?

A: Hafnium, hafnium rod, hafnium wire, nuclear grade, alloying grade, vacuum melted, chemical composition, corrosion testing, ASTM B737.