材料测试规范 AMS2248E

AEROSPACE MATERIAL

SPECIFICATION

AMS 2248E

IssuedRevisedReaffirmed

JAN 1960OCT 1993OCT 2000

Superseding AMS 2248D

Chemical Check Analysis Limits

Corrosion and Heat Resistant Steels and Alloys, Maraging and

Other Highly-Alloyed Steels, and Iron Alloys

1.SCOPE:1.1

This specification defines limits of variation for determining acceptability of chemical composition of cast and wrought corrosion and heat resistant steels and alloys, maraging and other highly alloyed steels, and iron alloy parts and materials acquired from a producer.

Check limits for elements or for ranges of elements not listed herein shall be as specified in the applicable material specification or as agreed upon by purchaser and producer.Application:

When specifically referenced in the material specification, the purchaser may apply check analysis limits to determine the acceptability of parts and materials at purchaser's final acceptance or verification testing operation.

Check analysis limits are not for producer's use at producer's acceptance testing.

1.1.1

1.21.2.1

1.2.2

2.APPLICABLE DOCUMENTS:

The following publications form a part of this specification to the extent specified herein. The

applicable issue of referenced publications shall be the issue in effect on the date of the purchase order.2.1

ASTM Publications:

Available from ASTM, 1916 Race Street, Philadelphia, PA 19103-1187.ASTM E 59

Sampling Steel and Iron for Determination of Chemical Composition

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 entirelyvoluntary, 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 2000 Society of Automotive Engineers, Inc.All rights reserved.

QUESTIONS REGARDING THIS DOCUMENT:TO PLACE A DOCUMENT ORDER:SAE WEB ADDRESS:

(724) 772-7161(724) 776-4970

http://www.sae.org

FAX: (724) 776-0243FAX: (724) 776-0790

Printed in U.S.A.

AMS 2248ESAEAMS 2248E

3.TECHNICAL REQUIREMENTS: 3.1

Analytical Procedures:

Methods of analysis shall be acceptable to purchaser.3.23.2.1

Definitions:

Check (Product or Verification) Analysis: An analysis made by purchaser after the steel or alloy has been worked into semi-finished or finished forms or fabricated into parts, and is either for the purpose of verifying the composition of a heat or lot or to determine variations in the composition within a heat. Acceptance or rejection of a heat or lot of product or batch of parts may be made by a purchaser on the basis of this check analysis.

Variation Limit, Under Minimum or Over Maximum: Given in 3.3 is the amount an individual

determination for a specified element may vary under or over the specified composition limit. In no case shall the several determinations of any element in a heat, using the same analytical

procedure, vary both above and below the specified range. These variations apply only to product analyses performed by purchaser.Check Analysis Limits: Shall be as shown in Table 1.

3.2.2

3.3

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AMS 2248ESAEAMS 2248E

TABLE 1 - Check Analysis Variation Limits

ElementCarbonUpper Limit or Max of Specified Range, % Up to 0.010,inclOver 0.010to 0.030, inclOver 0.030 to 0.20, inclOver 0.20 to 0.60, inclOver 0.60to 1.20, incl Up Over 1.00 Over 3.00 Over 6.00 Over 10.00 Over 15.00

to 1.00, inclto 3.00, inclto 6.00, inclto 10.00, inclto 15.00, inclto 20.00, incl

Variation Under min0.0020.0050.01 0.02 0.03 0.03 0.04 0.05 0.06 0.10 0.15 0.05 0.10 0.0050.0100.0050.0100.020

Chromium

Up Over 0.90 Over 2.10 Over 10.00 Over 15.00 Over 20.00 Up Over 1.00 Over 5.00 Over 10.00 Over 20.00 Over 30.00 Over 40.00

to 0.90,inclto 2.10, inclto 10.00, inclto 15.00, inclto 20.00, inclto 30.00, incl

Nickel

to 1.00, inclto 5.00,inclto 10.00, inclto 20.00, inclto 30.00, inclto 40.00, incl

0.03 0.07 0.10 0.15 0.20 0.25 0.30

0.03 0.07 0.10 0.15 0.20 0.25 0.30

0.03 0.05 0.10 0.15 0.20 0.25

0.03 0.05 0.10 0.15 0.20 0.25 VariationOver max0.0020.0050.01 0.02 0.03 0.03 0.04 0.05 0.06 0.10 0.15 0.05 0.10 0.0050.0100.0050.0100.020

Manganese

Silicon

Up to 1.00, inclOver 1.00 to 3.00, incl Up to 0.040, inclOver 0.040 to 0.20, incl Up to 0.040,inclOver 0.040 to 0.20, inclOver 0.20 to 0.50, incl

Phosphorus

Sulfur

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AMS 2248ESAEAMS 2248E

TABLE 1 - Check Analysis Variation Limits (Contined)

ElementCobaltUpper Limit or Max of Specified Range, %Over 0.05 to 0.50, inclOver 0.50 to 2.00, inclOver 2.00 to 5.00, inclOver 5.00 to 10.00, inclOver 10.00 to 15.00, inclOver 15.00 to 22.00, inclOver 22.00 to 30.00, inclOver 0.20 Over 0.60 Over 2.00 Over 7.00 Over 15.00 Up Over 1.00 Over 2.00 Over 5.00 Over 10.00

to 0.60, to 2.00,to 7.00, to 15.00, to 30.00, to 1.00, to 2.00, to 5.00, to 10.00, to 20.00,

inclinclinclinclinclinclinclinclinclincl

Variation Under min0.01 0.02 0.05 0.10 0.15 0.20 0.25 0.03 0.05 0.10 0.15 0.20 0.03 0.05 0.07 0.10 0.15 0.05 0.10 0.15 0.05 0.07 0.10 0.02 0.0050.05 0.10 0.20 0.35 0.0050.01 0.02 0.03 0.04

VariationOver max0.01 0.02 0.05 0.10 0.15 0.20 0.25 0.03 0.05 0.10 0.15 0.20 0.03 0.05 0.07 0.10 0.15 0.05 0.10 0.15 0.05 0.07 0.10 0.02 0.01 0.05 0.10 0.20 0.35 0.0050.01 0.02 0.03 0.04

Molybdenum

Tungsten

Columbium

Up to 1.50, inclOver 1.50 to 5.00, inclOver 5.00

Up to 1.00, inclOver 1.00 to 3.00, inclOver 3.00 Up Up Over 0.15 Over 0.50 Over 2.00 Over 5.00 Up Over 0.02 Over 0.19 Over 0.25 Over 0.35

to 0.10, inclto 0.15, to 0.50, to 2.00, to 5.00, to 10.00, to 0.02, to 0.19, to 0.25, to 0.35, to 0.45,

inclinclinclinclinclinclinclinclinclincl

Titanium

TantalumAluminum

Nitrogen

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AMS 2248ESAEAMS 2248E

TABLE 1 - Check Analysis Variation Limits (Continued)ElementBoronUpper Limit or Max of Specified Range, % 0.001 to 0.010,inclOver 0.01 to 0.12, incl

All

Up Over 1.00 Over 2.50 Over 5.00 Over 10.00 Over 15.00 Up Over 0.50 Over 1.00 Over 3.00 Over 5.00

to 1.00, inclto 2.50, inclto 5.00, inclto 10.00, inclto 15.00, inclto 30.00, inclto 0.50, inclto 1.00, inclto 3.00, inclto 5.00, inclto 10.00, incl

Variation Under min0.00040.005 0.03 0.03 0.05 0.07 0.10 0.15 0.25 0.03 0.05 0.10 0.15 0.20 0.03 0.05 0.000 0.05 0.005 --VariationOver max0.0010.01 0.03 0.03 0.05 0.07 0.10 0.15 0.25 0.03 0.05 0.10 0.15 0.20 0.03 0.05 0.02 0.05 0.01 0.005

SeleniumIron

Copper

Vanadium

Up to 0.50,inclOver 0.50 to 1.50, incl Up to 0.10, inclOver 0.10

Up to 0.05, inclUp to 0.010,incl

Zirconium

TinOxygen

4.QUALITY ASSURANCE PROVISIONS: 4.1

Sampling:

For the purpose of determining conformance to the material specification composition requirement, each heat or lot in a shipment shall be considered separately. All samples shall be taken from product in the condition in which it is received except that all protective surface treatments shall be removed before sampling finished parts. Drillings or chips shall be taken without the application of water, oil, or other lubricants, shall be free from scale, grease, dirt, and other foreign materials, and shall be taken in a manner to prevent alteration of the chemical composition of the sample. If

finished parts are too hard for machining, they may be tempered in a protective atmosphere prior to sampling. Sampling shall be in accordance with ASTM E 59, insofar as practical.

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AMS 2248ESAEAMS 2248E

5.PREPARATION FOR DELIVERY:

Not applicable.

6.ACKNOWLEDGMENT:

Not applicable.7.REJECTIONS:

Not applicable.8.NOTES: 8.1

A change bar ( l ) 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 this specification. An (R) symbol to the left of the document title indicates a complete revision of the specification, including technical revisions. Change bars and (R) are not used in original publications, nor in specifications that contain editorial changes only.

In the analysis of finished parts, check limits do not apply to elements whose percentage can be varied by fabricating techniques employed by purchaser (for example, carbon in steel) unless sample is taken in a manner which excludes such changes.Similar Specifications:

SAE J409 is listed for information only and shall not be construed as an acceptable alternate unless all requirements of this AMS are met.8.4

Variations meeting the requirements of this specification have been classified under Federal Supply Classification (FSC) 95GP.

8.2

8.3

PREPARED UNDER THE JURISDICTION OF AMS COMMITTEE \"F\"

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