ASTM B603-24 PDF

Full title and description

ASTM B603-24 — Standard Specification for Drawn or Rolled Iron‑Chromium‑Aluminum Alloys for Electrical Heating Elements. Specifies requirements for annealed, drawn or rolled iron‑chromium‑aluminum alloy shapes used in electrical heating and resistance applications, including chemical composition, electrical resistivity, mechanical properties, and temperature‑dependent resistance behavior.

Abstract

This specification covers annealed, drawn, or rolled shapes of iron‑chromium‑aluminum alloys intended for use as electrical heating and resistance elements. It defines composition classes, nominal resistivity ranges, acceptance tolerances, and requirements for properties that affect heating‑element performance. (See Table of chemical requirements and resistivity classes in the standard.)

General information

• Status: Active.
• Publication date: November 1, 2024 (designated B603‑24).
• Publisher: ASTM International.
• ICS / categories: Materials/Metallurgy — Ferroalloys and resistance/heating materials (commonly mapped to ICS 77.100 and within ASTM Book of Standards Vol. 02.04, Subcommittee B02.10).
• Edition / version: B603‑24. DOI: 10.1520/B0603-24.
• Number of pages: 3 (concise specification).

Scope

The standard applies to annealed, drawn, or rolled shapes (wire, strip, etc.) of iron‑chromium‑aluminum alloys produced for electrical heating and resistance use. It establishes allowable chemical composition ranges for named classes, the nominal resistivity ranges (at ~25 °C), permissible electrical‑resistance tolerances by product form and size, and basic mechanical/property acceptance criteria. Units are provided in inch‑pound as standard with SI conversions for information.

Key topics and requirements

• Chemical composition classes (Al and Cr ranges) that define alloy types used for different resistivity targets.
• Nominal resistivity ranges by class (expressed in Ω·cmil/ft and μΩ·cm) and allowed tolerances for wire and strip.
• Requirements for electrical resistance measurements and test methods (resistivity determined per the referenced ASTM test method).
• Mechanical property and form (drawn/rolled/annealed) acceptance provisions relevant to heating‑element fabrication.
• Temperature dependence of resistance (guidance on temperature‑coefficient/performance characteristics used in selection).

Typical use and users

Used by manufacturers of resistance and heating elements, wire and strip producers, materials engineers, test laboratories, specification writers, and procurement teams who need a concise, consensus specification for iron‑chromium‑aluminum resistance alloys for furnaces, industrial heaters, household heating devices, and similar applications.

Related standards

Commonly referenced and related documents include ASTM B63 (Test Method for Resistivity of Metallically Conducting Resistance and Contact Materials) for resistivity determination and other ASTM test methods such as tensile/test standards (e.g., ASTM E8/E8M) and relevant ASTM product‑form practices found in Book of Standards Vol. 02.04. Users should consult the standard's normative references for the complete list.

Keywords

iron‑chromium‑aluminum, heating element alloys, resistance wire, resistivity, electrical heating, alloy classes, ASTM B603, heating‑element specification.

FAQ

Q: What is this standard?

A: ASTM B603‑24 is a concise specification that defines drawn or rolled iron‑chromium‑aluminum alloys intended for electrical heating and resistance applications, covering composition, resistivity ranges, and acceptance tolerances.

Q: What does it cover?

A: It covers annealed, drawn or rolled shapes (wire, strip, etc.), specifying chemical/compositional classes, nominal resistivity ranges and tolerances, basic mechanical/property requirements, and considerations for temperature‑dependent resistance.

Q: Who typically uses it?

A: Heating‑element manufacturers, resistance‑wire producers, materials engineers, test labs, and procurement/sourcing teams that specify and verify iron‑chromium‑aluminum resistance alloys.

Q: Is it current or superseded?

A: Current — the B603‑24 edition (published/implemented in late 2024) supersedes earlier B603 editions. Check ASTM or authorized distributors for any later revisions.

Q: Is it part of a series?

A: It is part of ASTM's Vol. 02.04 (Nonferrous Metals and Alloys) collection and developed by Committee B02 (Subcommittee B02.10 on thermostat metals and electrical resistance/heating materials). Related ASTM standards for resistance materials and test methods are published in the same volume.

Q: What are the key keywords?

A: iron‑chromium‑aluminum, heating element, resistance alloy, resistivity, wire, strip, ASTM B603.