ASTM A801-21 PDF

Full title and description

Standard Specification for Wrought Iron‑Cobalt High Magnetic Saturation Alloys (UNS R30005 and K92650). This ASTM specification defines chemical, magnetic and product‑form requirements for two wrought Fe–Co alloys used where high saturation flux density and high permeability (at or above about 1.5 T / 15 kG) are required.

Abstract

This specification covers two wrought iron‑cobalt alloy types (commonly identified by UNS R30005 and UNS K92650), describes nominal compositions and chemical limits, states magnetic property requirements and dimensional/tolerance considerations, and addresses forms supplied (forging billets, hot‑rolled bars/plate/strip, cold‑finished bars, and cold‑rolled strip). Appendices provide guidance on heat treatment and typical physical properties.

General information

• Status: Active.
• Publication date: February 1, 2021.
• Publisher: ASTM International.
• ICS / categories: 77.080.10 (Irons / magnetic materials).
• Edition / version: A801‑21 (2021 edition).
• Number of pages: 6.

Scope

The standard applies to wrought Fe–Co high‑saturation alloys in two specified types: Alloy Type 1 (UNS R30005, nominally ≈49% Co, ≈49% Fe, ≈2% V) and Alloy Type 2 (UNS K92650, nominally ≈27% Co, small Cr, balance Fe). It covers material supplied in forms appropriate for subsequent fabrication and final heat treatment (forging billets; hot‑rolled bar, plate, and strip; cold‑finished bars; and cold‑rolled strip). It does not cover parts produced by casting or by powder‑metallurgical techniques. The specification requires chemical analysis, magnetic property verification, and provides guidance on heat treatment and physical properties.

Key topics and requirements

• Defined nominal compositions and maximum impurity limits (controls on C, N, S, etc.).
• Magnetic property requirements (DC magnetic properties and saturation flux density targets, suitable for applications at and above ~1.5 T / 15 kG).
• Product forms and physical conditions: forging billets, hot‑rolled products (bar, plate, strip), cold‑finished bar, cold‑rolled strip.
• Dimensional tolerances, marking, packaging and purchaser‑specified special requirements.
• Test methods and inspection: chemical analysis for key elements, magnetic testing procedures, and heat‑treatment conditioning of test specimens.
• Appendices with recommended heat‑treatment practices and typical physical property data for design and processing.

Typical use and users

Used by designers and manufacturers of magnetic components requiring very high saturation and good permeability (electromagnets, pole pieces, flux guides, specialty transformers, and high‑field magnetic circuits). Typical users include material producers and suppliers, metallurgical and heat‑treatment engineers, magnetic component designers, test laboratories, quality/inspection personnel, and procurement/specification engineers in aerospace, industrial magnetics and scientific equipment sectors.

Related standards

Related ASTM standards and test methods commonly referenced with this specification include ASTM test practices and terminologies for magnetic testing and sampling (for example, related D‑C magnetic test methods and magnetic terminology standards used by ASTM technical committees). Users often reference other magnetic‑material standards and manufacturer datasheets when comparing saturation, permeability and heat‑treatment guidance.

Keywords

iron‑cobalt, Fe‑Co, UNS R30005, UNS K92650, high saturation, saturation flux density, magnetic alloys, permendur, composition limits, heat treatment, magnetic testing, ASTM A801

FAQ

Q: What is this standard?

A: ASTM A801‑21 is the ASTM International specification that defines chemical, magnetic and product‑form requirements for two wrought iron‑cobalt high‑saturation alloys (UNS R30005 and UNS K92650) used in high‑field magnetic components.

Q: What does it cover?

A: It covers nominal compositions and impurity limits, required magnetic properties (including saturation flux density), acceptable product forms (forging billets, hot‑rolled and cold‑finished products, strip), inspection and test requirements, dimensional tolerances, and includes appendices on heat treatment and typical physical properties.

Q: Who typically uses it?

A: Material producers, magnetic‑component designers, metallurgists, heat‑treaters, test laboratories, purchasing/specification engineers and quality inspectors in industries where high magnetic saturation is needed (aerospace, industrial magnetics, scientific instruments).

Q: Is it current or superseded?

A: As published it is the 2021 edition (A801‑21) and is listed as an active ASTM specification; users should check ASTM International for any amendments or later revisions beyond 2021 if they need the very latest status.

Q: Is it part of a series?

A: It is a standalone material specification within ASTM’s magnetics materials activity and is often used in conjunction with ASTM test methods and terminology standards for magnetic testing (referenced within the standard for sampling and magnetic property measurement procedures).

Q: What are the key keywords?

A: iron‑cobalt, high saturation, UNS R30005, K92650, permendur, magnetic alloys, saturation flux density, heat treatment, ASTM A801.