SAE AMS 4903D-2020

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AEROSPACE

MATERIAL SPECIFICATION

AMS4903™

REV. D

Issued 2003-04

Revised 2020-01

Superseding AMS4903C

Titanium Alloy Sheet, Strip, and Plate

6Al - 4V

Solution Heat Treated

(Composition similar to UNS R56400)

RATIONALE

AMS4903D is a Five-Year Review and update of this specification that adds ASTM E2994 to composition analytical methods

(3.1), corrects size in Table 3, prohibits unauthorized exceptions (3.9), and revises reporting (4.4) and identification (5.1).

1. SCOPE

1.1 Form

This specification covers a titanium alloy in the form of sheet strip and plate up through 2.000 inches (50.80 mm), inclusive.

1.2 Application

This material has been used typically for parts to be formed or machined in the solution heat treated condition and

subsequently precipitation heat treated requiring high strength-to-weight ratio and stability up to 550 °F (288 °C) in the

precipitation heat treated condition, but usage is not limited to such applications.

1.3 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.

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SAE INTERNATIONAL AMS4903™D Page 2 of 8

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.

AMS2242 Tolerances, Corrosion and Heat Resistant Steel, Iron Alloy, Titanium, and Titanium Alloy Sheet, Strip, and

Plate

AMS2249 Chemical Check Analysis Limits, Titanium and Titanium Alloys

AMS2368 Sampling and Testing of Wrought Titanium Raw Materials Except Forgings and Forging Stock

AMS2631 Ultrasonic Inspection, Titanium and Titanium Alloy Bar and Billet

AMS2750 Pyrometry

AMS2809 Identification Titanium and Titanium Alloy Wrought Products

ARP982 Minimizing Stress-Corrosion Cracking in Wrought Titanium Alloy Products

AS4194 Sheet and Strip Surface Finish Nomenclature

AS6279 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 E8/E8M Tension Testing of Metallic Materials

ASTM E290 Bend Testing of Material for Ductility

ASTM E384 Microindentation Hardness of Materials

ASTM E539 Analysis of Titanium Alloys by 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 AMS4903™D Page 3 of 8

Table 1 - Composition

Element

Min

Max

Aluminum

5.50

6.75

Vanadium

3.50

4.50

Iron

0.30

Oxygen

0.20

Carbon

0.08

Nitrogen

0.05

(500 ppm)

Hydrogen

0.015

(150 ppm)

Yttrium (3.1.1)

0.005

( 50 ppm)

Other Elements, each (3.1.1)

0.10

Other Elements, total (3.1.1)

0.40

Titanium

remainder

3.1.1 Determination not required for routine acceptance.

3.1.2 Check Analysis

Composition variations shall meet the 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 melt cycle.

3.2.1 The atmosphere for non-consumable 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 Sheet and Strip

Hot rolled, with or without subsequent cold reduction, solution heat treated, descaled, and leveled, having a surface

appearance comparable to a commercial corrosion-resistant steel No. 2D finish (see 8.3).

3.3.2 Plate

Hot rolled, solution treated, and flattened, having a surface appearance comparable to a commercial corrosion-resistant

steel No. 1 finish (see 8.3). Plate product shall be produced using standard industry practices designed strictly for the

production of plate stock to the procured thickness. Bar, billet, forgings, or forging stock shall not be substituted for plate.

3.4 Solution Heat Treatment

The product shall be solution heat treated by heating to a temperature within the range 1650 to 1775 °F (899 to 968 °C),

holding at the selected temperature within ±25 °F (±14 °C) for a time commensurate with product thickness and the heating

equipment and procedure used, and cooling at a rate that will produce product meeting the requirements of 3.5. When

vacuum furnace equipment is used, inert gas cooling may be applied. Pyrometry shall be in accordance with AMS2750.

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摘要：

SAE AMS 4903D-2020 是美国汽车工程师学会（SAE）发布的一项关键航空航天材料规范，专指钛合金（Ti-6Al-4V）退火板材、薄板和带材的技术要求。该标准规定了材料的化学成分、力学性能、热处理工艺、表面质量及检测方法，适用于飞机结构件、发动机部件及其他高可靠性应用场景。AMS 4903D 版本更新于2020年，替代旧版并强化了材料均匀性、可焊性和抗疲劳特性，确保其在极端温度与应力环境下的稳定性。该标准是航空航天制造、金属材料采购及品质管控领域的必备参考文件，有助于工程人员合规选用

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