AEROSPACE AMS 5643Q

MATERIAL Issued OCT 1951

SPECIFICATION Revised JAN 2003

Superseding AMS 5643P

Steel, Corrosion-Resistant, Bars, Wire, Forgings, Tubing, and Rings

16Cr - 4.0Ni - 0.30Cb - 4.0Cu
Solution Heat Treated, Precipitation Hardenable
(Composition similar to UNS S17400)

1. SCOPE:

1.1 Form:

This specification covers a corrosion-resistant steel in the form of bars, wire, forgings, mechanical
tubing, flash welded rings, and stock for forging, flash welded rings or heading.

1.2 Application:

These products have been used typically for parts requiring corrosion resistance and high strength
up to 600 °F (316 °C), but usage is not limited to such applications.

1.2.1 Certain processing procedures and service conditions may cause these products to become
susceptible to stress-corrosion cracking; ARP1110 recommends practices to minimize such
conditions.

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.

SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely
voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”
SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions.
Copyright 2003 Society of Automotive Engineers, Inc.
All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying,
recording, or otherwise, without the prior written permission of SAE.

TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada)

Tel: 724-776-4970 (outside USA)
Fax: 724-776-0790
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2.1 SAE Publications:

Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001 or www.sae.org.

AMS 2241 Tolerances, Corrosion and Heat-Resistant Steel, Iron Alloy, Titanium, and Titanium
Alloy Bars and Wire
AMS 2243 Tolerances, Corrosion and Heat-Resistant Steel Tubing
AMS 2248 Chemical Check Analysis Limits, Corrosion and Heat-Resistant Steels and Alloys,
Maraging and Other Highly-Alloyed Steels, and Iron Alloys
AMS 2315 Determination of Delta Ferrite Content
AMS 2371 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steels and
Alloys, Wrought Products and Forging Stock
AMS 2374 Quality Assurance Sampling and Testing, Corrosion and Heat-Resistant Steel and
Alloy Forgings
AMS 2806 Identification, Bars, Wire, Mechanical Tubing, and Extrusions, Carbon and Alloy
Steels and Corrosion and Heat-Resistant Steels and Alloys
AMS 2808 Identification, Forgings
AMS 7490 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

2.2 ASTM Publications:

Available from ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959 or
www.astm.org.

ASTM A 370 Mechanical Testing of Steel Products

ASTM E 340 Macroetching Metals and Alloys
ASTM E 353 Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar
Chromium-Nickel-Iron Alloys

3. TECHNICAL REQUIREMENTS:

3.1 Composition:

Shall conform to the percentages by weight shown in Table 1, determined by wet chemical methods
in accordance with ASTM E 353, by spectrochemical methods, or by other analytical methods
acceptable to purchaser.

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TABLE 1 - Composition
Element min max
Carbon - 0.07
Manganese - 1.00
Silicon - 1.00
Phosphorus - 0.040
Sulfur - 0.030
Chromium 15.00 17.50
Nickel 3.00 5.00
Columbium 5xC 0.45
Copper 3.00 5.00
Molybdenium - 0.50

3.1.1 Check Analysis: Composition variations shall meet the applicable requirements of AMS 2248.

3.2 Condition:

The product shall be supplied in the following condition:

3.2.1 Bars and Wire:

3.2.1.1 Rounds: Solution heat treated and smooth turned, centerless ground, or centerless ground and
polished.

3.2.1.2 Hexagons: Cold drawn, solution heat treated, and descaled.

3.2.1.3 Squares and Flats: Hot finished, solution heat treated and descaled.
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3.2.2 Forgings and Flash Welded Rings: Solution heat treated and descaled.

3.2.2.1 Flash welded rings shall not be supplied unless specified or permitted on purchaser’s part
drawing. When supplied, rings shall be manufactured in accordance with AMS 7490.

3.2.3 Mechanical Tubing: Hot or cold finished, solution heat treated, and descaled.

3.2.4 Stock for Forging, Heading, or Flash Welded Rings: As ordered by the forging, heading, or flash
welded ring manufacturer.

3.3 Heat Treatment:

Bars, wire, forgings, mechanical tubing, and flash welded rings shall be solution heat treated to
1900 °F ± 25 (1038 °C ± 14), holding at heat for a time commensurate with section thickness,
heating equipment, and procedure used, and cooling as required to below 90 °F (32 °C).

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3.3.1 Flash welded rings may be given a homogenization heat treatment prior to solution heat treatment
when permitted by purchaser. When such treatment is permitted, rings shall be heated to
2100 °F ± 25 (1149 °C ± 14), held at heat for not less than 90 minutes, and cooled at a rate
equivalent to, or faster than, an air cool.

3.4 Properties:

The product shall conform to the following requirements; tensile and hardness testing shall be
performed in accordance with ASTM A 370:

3.4.1 Macrostructure: Visual examination of transverse sections etched in hot hydrochloric acid in
accordance with ASTM E 340, shall show no pipe or cracks. Porosity, segregation, inclusions,
and other imperfections shall be controlled by macrostructure standards established by purchaser.

3.4.2 Microstructure: The product shall contain not more than 5% ferrite, determined in accordance with
AMS 2315.

3.4.3 Mechanical Properties:

3.4.3.1 As Solution Heat Treated: Hardness shall conform to Table 2.

3.4.3.2 Response to Precipitation Heat Treatment: Solution heat treated product up to 8.0 inches
(203 mm) in diameter or least distance between parallel sides, precipitation heat treated to a
particular condition in accordance with the corresponding temperatures and times shown in Table
2, and cooled in air shall have the properties shown in Table 2 for that particular condition. Tensile
and hardness tests shall be made in the H900 condition, unless purchaser specifies another
condition.
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TABLE 2 - Hardness and Minimum Tensile Properties

Tensile Yield Strength Elongation Reduction Hardness Hardness Temperature/
Strength at 0.2% Offset in 4D of Area (1) (1) Time
Condition ksi (MPa) ksi (MPa) % % HB HRC °F (°C)/Hours
H900 190 (1310) 170 (1172) 10 40 (2) 388-444 40-47 900 (482)/1 (3)
H925 170 (1172) 155 (1069) 10 44 (2) 375-429 38-45 925 (496)/4 (4)
H1025 155 (1069) 145 (1000) 12 45 331-401 34-42 1025 (552)/4 (4)
H1075 145 (1000) 125 (862) 13 45 311-375 31-38 1075 (579)/4 (4)
H1100 140 (965) 115 (793) 14 45 302-363 30-37 1100 (593)/4 (4)
H1150 135 (931) 105 (724) 16 50 277-352 28-37 1150 (621)/4 (4)
Solution
Heat
Treated 363 (5) 39 (5) 1900 (1038) (6)

NOTES:

(1) Hardness shall not be the basis for rejection if tensile properties are acceptable determined
on specimens taken from the same sample as that with nonconforming hardness or from
another sample with similar nonconforming hardness.
(2) For sizes over 3 inches (76 mm), 35% for H900 condition and 38% for H925 condition.
(3) Temperature tolerance ±10 °F (±6 °C); time tolerance ± 0.083 hour (± 5 minutes); cool in air.
(4) Temperature tolerance ±10 °F (±6 °C); time tolerance ± 0.25 hour (± 15 minutes); cool in air.
(5) Maximum; alternate for wire - 175 ksi (1207 MPa) maximum tensile strength.
(6) Temperature tolerance ±25 °F (± 14 °C); time commensurate with thickness and
equipment; cooled as required to below 90 °F (32 °C).

3.4.3.2.1 Alternative Test of Forging Stock: A sample of stock, forged to a coupon having a percent
reduction not greater than the least reduced portion of the forging and heat treated in
accordance with 3.3 and Table 2, shall conform to the requirements of Table 2.

3.5 Quality:

The product, as received by purchaser, shall be uniform in quality and condition, sound, and free
from foreign materials and from imperfections detrimental to usage of the product.

3.5.1 Grain flow of die forgings, except in areas which contain flash-line end grain, shall follow the
general contour of the forgings showing no evidence of reentrant grain flow.

3.6 Tolerances:
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Shall conform to all applicable requirements of the following:

3.6.1 Bars and Wire: AMS 2241.

3.6.2 Mechanical Tubing: AMS 2243.

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4. QUALITY ASSURANCE PROVISIONS:

4.1 Responsibility for Inspection:

The vendor of the product shall supply all samples for vendor’s tests and shall be responsible for the
performance of all required tests. Purchaser reserves the right to sample and to perform any
confirmatory testing deemed necessary to ensure that the product conforms to specified

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requirements.

4.2 Classification of Tests:

4.2.1 Acceptance Tests: The following requirements are acceptance tests and shall be performed on
each heat or lot as applicable:

4.2.1.1 Composition (3.1) and macrostructure (3.4.1) of each heat.

4.2.1.2 Hardness (Table 2) of each lot of bars, wire, forgings, mechanical tubing, and flash welded rings
as solution heat treated.

4.2.1.3 Mechanical properties (Table 2) and microstructures (3.4.2) of each lot of bars, wire, forgings,
mechanical tubing, and flash welded rings after precipitation heat treatment to the specified
condition (3.4.3.2).

4.2.1.4 Tolerances (3.7) of bars, wire, and mechanical tubing.

4.2.2 Periodic Tests: Tests of forging stock (3.4.3.2.1) to demonstrate ability to develop required
properties, tests of other products to demonstrate ability to develop required properties in
conditions other than that tested in accordance with (3.4.3.2), and grain flow of die forgings (3.5.1),
are periodic tests and shall be performed at a frequency selected by the vendor unless frequency
of testing is specified by purchaser.

4.3 Sampling and Testing:

Shall be in accordance with the following:

4.3.1 Bars, Wire, Mechanical Tubing, Flash Welded Rings, and Stock for Forging, Flash Welded Rings,
or Heading: AMS 2371.

4.3.2 Forgings: AMS 2374.

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4.4 Reports:

The vendor of the product shall furnish with each shipment a report showing the results of tests for
composition, macrostructure, and microstructure of each heat and for hardness as solution heat

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treated and tensile properties and hardness after precipitation heat treatment of each lot, and stating
that the product conforms to the other technical requirements. This report shall include the purchase
order number, heat and lot numbers, AMS 5643Q, size, and quantity. If forgings are supplied, the
size and melt source of stock used to make the forgings shall also be included.

4.5 Resampling and Retesting:

Shall be in accordance with the following:

4.5.1 Bars, Wire, Mechanical Tubing, Flash Welded Rings, and Stock for Forging, Flash Welded Rings,
or Heading: AMS 2371.

4.5.2 Forgings: AMS 2374.

5. PREPARATION FOR DELIVERY:

5.1 Sizes:

Except when exact length or multiples of exact lengths are ordered, straight bars, wire, and tubing
will be acceptable in mill lengths of 6 to 20 feet (1.8 to 6.1 m) but not more than 10% of any shipment
shall be supplied in lengths shorter than 10 feet (3 m).

5.2 Identification:

Shall be as follows:

5.2.1 Bars, Wire, and Mechanical Tubing: In accordance with AMS 2806.

5.2.2 Forgings: In accordance with AMS 2808.

5.2.3 Flash Welded Rings and Stock for Forging, Flash Welded Rings, or Heading: As agreed upon by
purchaser and vendor.

5.3 Packaging:

The product shall be prepared for shipment in accordance with commercial practice and in
compliance with applicable rules and regulations pertaining to the handling, packaging, and
transportation of the product to ensure carrier acceptance and safe delivery.

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6. ACKNOWLEDGMENT:

A vendor shall mention this specification number and its revision letter in all quotations and when
acknowledging purchase orders.

7. REJECTIONS:

Product not conforming to this specification, or to modifications authorized by purchaser, will be

subject to rejection.

8. NOTES:

8.1 A change bar (|) located in the left margin is for the convenience of the user in locating areas where
technical revisions, not editorial changes, have been made to the previous issue of a specification.
An (R) symbol to the left of the document title indicates a complete revision of the specification,
including technical revision. Change bars and (R) are not used in original publications, nor in
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specifications that contain editorial changes only.

8.1.1 This AMS 5643Q is an editorial correction necessary to correct publication errors in the P revision,
and to involve a new 3.2.3 that resulted from a recent 28-day limited scope ballot. In this instance,
the change bar symbol(s) included herein are for the convenience of the user in locating areas
where technical changes have been made to the N and P revisions of this specification.

8.2 Terms used in AMS are clarified in ARP1917.

8.3 The MIL-HDBK-5 values are lower than specification tensile strength values for some heat treat
conditions.

8.4 Procurement documents should specify not less than the following:
AMS 5643Q
Form and size or part number of product desired
Quantity of product desired
Acceptance standards for macrostructure (See 3.4.1)
Precipitation heat treated condition for test if other than H900 (See 3.4.3.2).

PREPARED UNDER THE JURSDICTION OF AMS COMMITTEE “F”

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