SAE AMS 4881E-2025 镍铝青铜马氏体砂离心和连续铸件78Cu - 11Al - 5.1Ni - 4.8Fe淬火硬化和回火退火（UNS C95520）

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For more information on this standard, visit

https://www.sae.org/standards/content/AMS4881E/

AEROSPACE

MATERIAL SPECIFICATION

AMS4881™

REV. E

Issued 1976-07

Reaffirmed 2018-05

Revised 2025-06

Superseding AMS4881D

Nickel-Aluminum-Bronze, Martensitic, Sand, Centrifugal and Continuous Castings,

78Cu - 11Al - 5.1Ni - 4.8Fe,

Quench Hardened and Temper Annealed

(Composition similar to UNS C95520)

RATIONALE

AMS4881E results from a Five-Year Review and update of this specification with changes to clarify that casting approval

and reapproval actions are to be carried out by the cognizant engineering organization (see 4.2 and 4.4); update wording

to prohibit unauthorized exceptions (see 3.8, 4.5.1, and 8.4); relocate Definitions (see 2.3); update Applicable Documents

(see Section 2), Composition (see 3.1), Casting (3.3), Hardness (3.6.2), and Ordering Information (see 8.5); add default

requirement for inspection (see 3.7.3); and allow the use of the immediate prior specification revision (see 8.3).

1. SCOPE

1.1 Form

This specification covers a nickel-aluminum-bronze alloy in the form of sand, centrifugal, and continuous castings (see 8.5).

1.2 Application

These castings have been used typically for parts requiring a combination of high strength and hardness with some ductility

and toughness, 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.

AMS2175 Castings, Classification and Inspection of

AMS2360 Room Temperature Tensile Properties of Castings

SAE INTERNATIONAL AMS4881™E Page 2 of 8

AMS2630 Inspection, Ultrasonic, Product Over 0.5 Inch (12.7 mm) Thick

AMS2694 In-Process Welding of Castings

AMS2750 Pyrometry

AMS2804 Identification, Castings

AS7766 Terms Used in Aerospace Metals Specifications

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 B208 Preparing Tension Test Specimens for Copper Alloy Sand, Permanent Mold, Centrifugal, and

Continuous Castings

ASTM B601 Temper Designations for Copper and Copper Alloys - Wrought and Cast

ASTM E8/E8M Tension Testing of Metallic Materials

ASTM E18 Rockwell Hardness of Metallic Materials

ASTM E478 Chemical Analysis of Copper Alloys

ASTM E1417/E1417M Liquid Penetrant Testing

ASTM E1742/E1742M Radiographic Examination

2.3 Definitions

Terms used in AMS are defined in AS7766.

2.3.1 Copper temper designations are defined in ASTM B601.

3. TECHNICAL REQUIREMENTS

3.1 Composition

Shall conform to the percentages by weight shown in Table 1, determined in accordance with ASTM E478 by or by other

analytical methods acceptable to the purchaser (see 8.5).

Table 1 - Composition

Element (see 3.1.1)

Min

Max

Copper (see 3.1.2)

74.5

Aluminum

10.5

11.5

Nickel

4.2

6.0

Iron

4.0

5.5

Manganese

1.5

Zinc

0.30

Tin

0.25

Cobalt

0.20

Silicon

0.15

Chromium

0.05

Lead

0.03

Sum of Named Elements (see 3.1.3)

99.8

SAE INTERNATIONAL AMS4881™E Page 3 of 8

3.1.1 These composition limits do not preclude the presence of other elements. Limits may be established and analysis

required for unnamed elements by agreement between the manufacturer or supplier and purchaser.

3.1.2 Copper may be reported as “remainder” or as the difference between the sum of results for all elements and 100%

or as the result of direct analysis.

3.1.3 When all named elements in Table 1 are analyzed, the sum shall be 99.8% minimum, but such determination is not

required for routine acceptance of each lot.

3.2 Condition

Quench hardened and temper annealed (TQ50) (see 2.3.1).

3.3 Casting

Castings shall be produced in lots from metal conforming to 3.1. Metal remelted from previously analyzed and compliant

ingot may be poured directly into castings. Molten metal taken from alloying furnaces, with or without additions of foundry

operating scrap (gates, sprues, risers, and rejected castings), shall not be poured into castings unless first converted to

ingot, analyzed, and remelted or unless the composition of a sample taken after the last addition to the melt conforms to 3.1.

3.3.1 A melt shall be the metal withdrawn from a batch furnace charge of 2000 pounds (907 kg) or less as melted for

pouring castings, or when permitted by the purchaser, a melt shall be 4000 pounds (1814 kg) or less of metal

withdrawn from one continuous furnace in not more than 8 consecutive hours.

3.3.2 A lot shall be all castings poured from a single melt in not more than 8 consecutive hours and quench hardened

and temper annealed in the same heat-treatment batch.

3.4 Test Specimens

3.4.1 Chemical Analysis Specimens

Shall be cast from each melt and be of any convenient size, shape, and form.

3.4.2 Tensile Coupons

Shall be cast with each lot of sand cast or centrifugal cast castings and as follows:

3.4.2.1 Sand Cast

Coupons from which specimens are produced shall be standard keel blocks in accordance with ASTM B208 cast in molds

made with the regular foundry mix of sand, without using chills, or in baked core sand molds. Metal for the coupons shall

be part of the melt that is used for the castings and shall be poured at a temperature not lower than the temperature of the

metal during pouring of the castings. If the metal for castings is given any treatment, such as fluxing or cooling and reheating,

the metal for the coupons shall be a portion of the metal so treated and during such treatment shall be heated to the same

maximum temperature and held for approximately the same length of time as the molten metal for the castings. Coupons

shall be heat treated with the castings in accordance with 3.5 and machined to standard tensile specimens conforming to

ASTM E8/E8M with 0.500-inch (12.70-mm) diameter at the reduced parallel gauge section.

3.4.2.2 Centrifugally Cast

Coupons from which specimens are produced shall be cylindrical bars of such size to allow machining specimens

conforming to ASTM E8/E8M with 0.500-inch (12.70-mm) diameter at the reduced parallel gauge section. Metal for the

coupons shall be part of the melt that is used for the castings and shall be poured at a temperature not lower than the

temperature of the metal during pouring of the castings. If the metal for castings is given any treatment, such as fluxing or

cooling and reheating, the metal for the coupons shall be a portion of the metal so treated and during such treatment shall

be heated to the same maximum temperature and held for approximately the same length of time as the molten metal for

the castings.

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标签： #铸件 #马氏体 #镍

摘要：

本文档详细介绍了SAE AMS 4881E-2025标准，适用于镍铝青铜马氏体材料的砂型铸造、离心铸造和连续铸造件。该合金的典型成分为78%铜、11%铝、5.1%镍和4.8%铁（对应UNS C95520），经过淬火硬化和回火退火处理，以获得优良的机械性能和耐腐蚀性。该标准为航空航天及工业领域提供了材料要求、热处理工艺及验收规范，确保铸件在高温、高压及腐蚀环境下的可靠性与耐久性。适用于需要高强度、耐磨性和抗海水腐蚀的关键部件制造，是工程选材和采购的重要技术依据。

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SAE AMS 4881E-2025 镍铝青铜马氏体砂离心和连续铸件78Cu - 11Al - 5.1Ni - 4.8Fe淬火硬化和回火退火（UNS C95520）

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