SAE AMS 6517B-2019

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AEROSPACE

MATERIAL SPECIFICATION

AMS6517™

REV. B

Issued 2011-03

Revised 2019-10

Superseding AMS6517A

Steel, Bars, and Forgings

3.5Cr - 9.5Ni - 18Co - 1.1Mo (0.13 - 0.17C)

Double Vacuum Melted, Normalized, Annealed

(Composition similar to UNS K93061)

RATIONALE

AMS6517B results from a Five-Year Review and update of this specification that revises analytical methods (3.1),

changes room temperature to quantitative values (3.4, 3.5.3.1), revises format to be consistent with AMS6509A (3.5.3),

adds tensile testing strain rates (3.5.3.1.1.3), revises quality (3.6.2), adds AS6279 (3.8), prohibits unauthorized exceptions

(3.9), makes forging properties acceptance tests (4.2.1.4) and revises reporting (4.4) and identification (5.2.1).

1. SCOPE

1.1 Form

This specification covers a premium aircraft-quality alloy steel in the form of bars, forgings, and forging stock.

1.2 Application

These products have been used typically for carburized parts requiring high minimum core hardness with a narrow range,

reduced distortion and subject to magnetic particle inspection standards, but usage is not limited to such applications.

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.

AMS2251 Tolerances, Low-Alloy Steel Bars

AMS2259 Chemical Check Analysis Limits, Wrought Low-Alloy and Carbon Steels

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

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SAE INTERNATIONAL AMS6517™B Page 2 of 8

AMS2370 Quality Assurance Sampling and Testing, Carbon and Low-Alloy Steel Wrought Products and Forging

Stock

AMS2372 Quality Assurance Sampling and Testing Carbon and Low-Alloy Steel Forgings

AMS2750 Pyrometry

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

Heat-Resistant Steels and Alloys

AMS2808 Identification Forgings

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 Standard Practice 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

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

ASTM E45 Determining the Inclusion Content of Steel

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

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

ASTM E112 Determining Average Grain Size

ASTM E399 Plane-Strain Fracture Toughness of Metallic Materials

3. TECHNICAL REQUIREMENTS

3.1 Composition

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

other analytical methods acceptable to purchaser.

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SAE INTERNATIONAL AMS6517™B Page 3 of 8

Table 1 - Composition

Element

Min

Max

Carbon

0.13

0.17

Manganese

0.10

Silicon

0.10

Phosphorus

0.008

Sulfur

0.005

Chromium

3.0

4.0

Nickel

9.2

9.8

Cobalt

17.5

18.5

Molybdenum

0.9

1.3

Titanium

0.045

Aluminum

0.1

Vanadium

0.04

0.12

Oxygen

0.0020 (20 ppm)

Nitrogen

0.0015 (15 ppm)

3.1.1 Check Analysis

Composition variations shall meet the applicable requirements of AMS2259.

3.2 Melting Practice

Steel shall be multiple melted using vacuum induction melting followed by vacuum arc remelting.

3.3 Condition

The product shall be supplied in the following condition unless another condition is authorized by purchaser; hardness

shall be determined in accordance with ASTM A370:

3.3.1 Bars and Forgings

Normalized and annealed (see 3.4) having hardness not higher than 352 HBW, or equivalent (see 8.2), as descaled. Bar

shall not be cut from plate.

3.3.2 Forging Stock

As ordered by the forging manufacturer.

3.4 Heat Treatment

Bars and forgings shall be normalized by heating to 1785 °F ± 25 °F (974 °C ± 14 °C) for a time commensurate with

section thickness, 60 minutes minimum, cooling in air to below 120 °F (49 °C) and annealed by heating to 1255 °F ± 25 °F

(679 °C ± 14 °C) for not less than 2 hours, and cooling in air. Pyrometry shall be in accordance with AMS2750.

3.5 Properties

The product shall conform to the following requirements; hardness and tensile testing shall be performed in accordance

with ASTM A370:

3.5.1 Macrostructure

Visual examination of transverse full cross-sections from bars, billets, and stock for forging, flash welded rings, or

extrusions, etched in hot hydrochloric acid in accordance with ASTM A604, shall not show pipe or cracks. Porosity,

segregation, inclusions, and other imperfections shall be no worse than the macrographs of ASTM A604 shown in

Table 2.

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摘要：

SAE AMS 6517B-2019 是美国汽车工程师学会（SAE）发布的一项航空航天材料规范，主要针对高合金、耐腐蚀及高温性能优异的马氏体时效钢（maraging steel）的棒材、线材、锻件等产品形式的技术要求。该标准替代了之前的AMS 6517A版本，细化了材料的化学成分、力学性能、热处理工艺及检测方法，适用于制造航空航天领域的结构件、紧固件及高应力部件。通过明确材料在退火或时效状态下的拉伸强度、硬度、冲击韧性等关键指标，该规范确保了材料在极端环境下的可靠性和一致性。对于从事航空航天制造

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