SAE AMS 4975P-2021

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For more information on this standard, visit

https://www.sae.org/standards/content/AMS4975P

AEROSPACE

MATERIAL SPECIFICATION

AMS4975™

REV. P

Issued 1960-05

Revised 2021-12

Superseding AMS4975N

Titanium Alloy, Bars, Wire, and Rings

6.0Al - 2.0Sn - 4.0Zr - 2.0Mo - 0.08Si

Solution and Precipitation Heat Treated

(Composition similar to UNS R54620)

RATIONALE

AMS4975P results from a Five-Year Review and update of the specification. Changes have been made to require reporting

of properties outside the size limits (3.5.1.1.4), prohibit unauthorized exceptions (3.9, 8.4), revise composition (2.2, 3.1),

reporting (4.4.3), and marking (5.1.1), and allow use of immediate prior specification revision (8.5).

1. SCOPE

1.1 Form

This specification covers a titanium alloy in the form of bars, wire, flash welded rings 3.00 inches (76.2 mm) and under in

nominal diameter or least distance between parallel sides and 16 in2 (103 cm2) and under in cross-sectional area and stock

of any size for flash welded rings (see 8.6).

1.2 Application

These products have been used typically for parts requiring high strength and toughness and good creep resistance up to

1000 °F (538 °C), but usage is not limited to such applications.

1.2.1 Certain processing procedures and service conditions may cause these products to become subject to

stress-corrosion cracking; ARP982 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.

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

AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys

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SAE INTERNATIONAL AMS4975™P Page 2 of 8

AMS2750 Pyrometry

AMS2809 Identification, Titanium and Titanium Alloy Wrought Products

AMS7498 Rings, Flash Welded, Titanium and Titanium Alloys

ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products

ARP1917 Clarification of Terms Used in Aerospace Metals Specifications

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 E8/E8M Tension Testing of Metallic Materials

ASTM E21 Elevated Temperature Tension Tests of Metallic Materials

ASTM E139 Conducting Creep, Creep-Rupture, and Stress-Rupture Tests of Metallic Materials

ASTM E539 Analysis of Titanium Alloys by Wavelength Dispersive X-Ray Fluorescence Spectrometry

ASTM E1409 Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys by Inert Gas Fusion

ASTM E1447 Determination of Hydrogen in Titanium and Titanium Alloys by the Inert Gas Fusion Thermal

Conductivity/Infrared Detection Method

ASTM E1941 Determination of Carbon in Refractory and Reactive Metals and Their Alloys by Combustion Analysis

ASTM E2371 Analysis of Titanium and Titanium Alloys by Direct Current Plasma and Inductively Coupled Plasma

Atomic Emission Spectrometry

ASTM E2994 Analysis of Titanium and Titanium Alloys by Spark Atomic Emission Spectrometry and Glow Discharge

Atomic Emission Spectrometry

3. TECHNICAL REQUIREMENTS

3.1 Composition

Shall conform to the percentages by weight shown in Table 1; carbon shall be determined in accordance with ASTM E1941,

hydrogen in accordance with ASTM E1447, oxygen and nitrogen in accordance with ASTM E1409, and other elements in

accordance with ASTM E539, ASTM E2371, or ASTM E2994. Other analytical methods may be used if acceptable to the

purchaser.

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SAE INTERNATIONAL AMS4975™P Page 3 of 8

Table 1 - Composition

Element

Min

Max

Aluminum

Zirconium

Molybdenum

Tin

Silicon

Oxygen

Iron

Carbon

Nitrogen

Hydrogen (3.1.1)

Yttrium (3.1.2)

Other Elements, each

(3.1.2)

Other Elements, total (3.1.2)

Titanium

5.50

3.60

1.80

0.06

remainder

6.50

4.40

2.20

0.10

0.15

0.10

0.05

0.0125

0.005

0.10

0.30

(500 ppm)

(125 ppm)

( 50 ppm)

3.1.1 Hydrogen content of rings may be as high as 0.0150 (150 ppm).

3.1.2 Determination not required for routine acceptance.

3.1.3 Check Analysis

Composition variations shall meet the applicable requirements of AMS2249.

3.2 Melting Practice

Alloy shall be multiple melted. The first melt shall be made by vacuum consumable electrode, nonconsumable electrode,

electron beam cold hearth, or plasma arc cold hearth melting practice. The subsequent melt or melts shall be made using

vacuum arc remelting (VAR) practice. Alloy additions are not permitted in the final VAR melt.

3.2.1 The atmosphere for nonconsumable electrode melting shall be vacuum or shall be argon and/or helium at an

absolute pressure not higher than 1000 mm of mercury.

3.2.2 The electrode tip for nonconsumable electrode melting shall be water-cooled copper.

3.3 Condition

The product shall be supplied in the following condition:

3.3.1 Bars

Hot finished with or without subsequent cold reduction, solution and precipitation heat treated, and descaled. The product

shall be processed to the final thickness/diameter by metallurgical working operations prior to any straightening, dimensional

sizing, or surface finishing operations. Bar shall not be cut from plate.

3.3.2 Wire

Cold drawn, solution and precipitation heat treated, and descaled.

3.3.3 Flash Welded Rings

Solution and precipitation heat treated and, when so specified, descaled.

3.3.3.1 Flash welded rings, when supplied, shall be manufactured in accordance with AMS7498.

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摘要：

SAE AMS 4975P-2021 是美国汽车工程师学会发布的钛合金材料技术规范，涵盖航空航天级钛合金的化学成分、机械性能及热处理要求。该标准适用于高强度、耐腐蚀的钛合金部件，如飞机结构件和发动机组件，确保材料在极端环境下具备可靠性。2021年更新版优化了检测方法，并符合最新行业安全与性能要求，为制造商和供应商提供统一的技术基准，有助于提升产品质量与合规性。

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