SAE AMS 5659T-2021

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For more information on this standard, visit

https://www.sae.org/standards/content/AMS5659T

AEROSPACE

MATERIAL SPECIFICATION

AMS5659™

REV. T

Issued 1965-09

Revised 2021-10

Superseding AMS5659S

Steel, Corrosion Resistant, Bars, Wire, Forgings, Rings, and Extrusions

15Cr - 4.5Ni - 0.30Cb (Nb) - 3.5Cu

Consumable Electrode Remelted

Solution Heat Treated, Precipitation Hardenable

(Composition similar to UNS S15500)

RATIONALE

AMS5659T prohibits unauthorized exceptions (3.9, 4.4.6, 5.2.1.1, 8.7), revises composition (3.1) to replace obsolete

chemical analysis standards, updates condition (3.3.1.1, 8.9), introduces AMS2761 replacing legacy controls (3.4), adds

strain rate control (3.5.2.2.1), deletes redundant requirements with AMS2371 (prior 3.5.2.2.1.2, 3.5.2.2.1.3), adds AS1182

(3.6.3, 8.6), updates title, allows prior revisions (8.8), and results from a Five-Year Review and update of this specification.

1. SCOPE

1.1 Form

This specification covers a corrosion resistant steel in the form of bars, wire, forgings, flash welded rings, and extrusions in

the solution heat treated condition (see 8.3), 12 inches (305 mm) and under in nominal diameter, thickness or for hexagons,

least distance between parallel sides, and having a maximum cross-sectional area of 144 in2 (930 cm2), and stock of any

size for forging, flash welded rings, or extruding.

1.1.1 For purchase of solution treated and aged product, use the applicable AMS slash specification (see 8.3). If a slash

sheet description is not specified, solution annealed material shall be supplied. A specific example of a slash

specification is:

AMS5659/H1025 - Precipitation Hardened to H1025 condition.

1.2 Application

These products have been used typically for parts requiring corrosion resistance and high strength up to 600 °F (316 °C)

with good ductility and strength in the transverse direction in large section sizes, but usage is not limited to such applications.

1.2.1 Certain design and processing procedures may cause these products to become susceptible to stress-corrosion

cracking. ARP1110 recommends practices to minimize such conditions.

1.3 Classification

Products covered by this specification are classified as follows:

Type 1 - Steel multiple melted using vacuum consumable electrode remelting.

Type 2 - Steel multiple melted using electroslag remelting.

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SAE INTERNATIONAL AMS5659™T Page 2 of 10

1.3.1 Unless a specific type is ordered, either type may be supplied.

2. APPLICABLE DOCUMENTS

The issue of the following documents in effect on the date of the purchase order forms a part of this specification to the

extent specified herein. The supplier may work to a subsequent revision of a document unless a specific document issue is

specified. When the referenced document has been cancelled and no superseding document has been specified, the last

published issue of that document shall apply.

2.1 SAE Publications

Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA

and Canada) or +1 724-776-4970 (outside USA), www.sae.org.

AMS2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Bars and Wire

AMS2248 Chemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys, Maraging and Other

Highly Alloyed Steels, and Iron Alloys

AMS2300 Steel Cleanliness, Premium Aircraft-Quality, Magnetic Particle Inspection Procedure

AMS2315 Determination of Delta Ferrite Content

AMS2371 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steels and Alloys, Wrought

Products and Forging Stock

AMS2374 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steel and Alloy Forgings

AMS2750 Pyrometry

AMS 2761 Heat Treatment of Steel Raw Materials

AMS2806 Identification Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy Steels and Corrosion and

Heat-Resistant Steels and Alloys

AMS2808 Identification Forgings

AMS7490 Rings, Flash Welded, Corrosion and Heat-Resistant Austenitic Steels, Austenitic-Type Iron, Nickel, or

Cobalt Alloys, or Precipitation-Hardenable Alloys

ARP1110 Minimizing Stress Corrosion Cracking in Wrought Forms of Steels and Corrosion Resistant Steels and

Alloys

ARP1917 Clarification of Terms Used in Aerospace Metals Specifications

AS1182 Standard Stock Removal Allowance Aircraft-Quality and Premium Aircraft-Quality Steel Bars and

Mechanical Tubing

AS6279 Industry Standard Practices for Production, Distribution, and Procurement of Metal Stock

2.2 ASTM Publications

Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959,

Tel: 610-832-9585, www.astm.org.

ASTM A370 Mechanical Testing of Steel Products

ASTM A604 Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets

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SAE INTERNATIONAL AMS5659™T Page 3 of 10

ASTM A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

ASTM E140 Hardness Conversion Tables for Metals, Relationship Among Brinell Hardness, Vickers Hardness,

Rockwell Hardness, Superficial Hardness, Knoop Hardness, Scleroscope Hardness, and Leeb Hardness

3. TECHNICAL REQUIREMENTS

3.1 Composition

Shall conform to the percentages by weight shown in Table 1, determined in accordance with ASTM A751, or by other

analytical methods acceptable to purchaser.

Table 1 - Composition

Element

Min

Max

Carbon

0.07

Manganese

1.00

Silicon

1.00

Phosphorus

0.030

Sulfur

0.015

Chromium

14.00

15.50

Nickel

3.50

5.50

Columbium (Niobium)

5xC

0.45

Copper

2.50

4.50

Molybdenum

0.50

3.1.1 Check Analysis

Composition variations shall meet the applicable requirements of AMS2248.

3.2 Melting Practice

Product shall be multiple melted using vacuum consumable electrode remelting for Type 1 or using electroslag remelting

for Type 2.

3.3 Condition

The product shall be supplied in the following condition:

3.3.1 Bars, Wire, Forgings, and Flash Welded Rings

3.3.1.1 Rounds

Solution heat treated and descaled. Bars 2.00 inch (50.8 mm) and under in nominal diameter shall be cold finished. Bars

over 2.0 inches (50.8 mm) in nominal diameter shall be hot or cold finished (see 3.6.3). When a specific finish is required,

it must be ordered (see 8.8).

3.3.1.2 Hexagons

Solution heat treated, cold drawn, and descaled.

3.3.1.3 Squares and Flats

Hot finished, solution heat treated, and descaled.

3.3.1.4 Bar shall not be cut from plate (also see 4.4.5).

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摘要：

SAE AMS 5659T-2021 是航空材料规范（AMS）中针对耐腐蚀钢棒材、线材、锻件及环形件的最新修订标准，专注于提供高温环境下优异的抗腐蚀性能和机械稳定性。该标准主要涵盖含铬量较高的马氏体不锈钢，适用于航空航天领域中需要承受高温、高应力及腐蚀性介质的零部件制造，例如发动机部件、液压系统和紧固件。与旧版本相比，AMS 5659T-2021 更新了热处理工艺要求、化学成分公差范围以及材料的微观组织检验标准，以确保材料在极端条件下的可靠性和一致性。遵循该规范可帮助制造商提升产品安全性和耐久性

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