SAE AMS 4842G-2025 铸造铅青铜砂和离心80Cu - 10Sn - 9.5Pb铸造 (UNS C93700)

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For more information on this standard, visit

https://www.sae.org/standards/content/AMS4842G/

AEROSPACE

MATERIAL SPECIFICATION

AMS4842™

REV. G

Issued 1941-09

Reaffirmed 2012-02

Revised 2025-06

Superseding AMS4842F

Castings, Leaded Bronze, Sand and Centrifugal,

80Cu - 10Sn - 9.5Pb,

As Cast

(Composition similar to UNS C93700)

RATIONALE

AMS4842G 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 4.2.1 and 4.4); update wording

to prohibit unauthorized exceptions (see 8.5); relocate Definitions (see 2.3); update Applicable Documents (see Section 2),

note on historical change to composition (see 8.2), Classification of Tests (see 4.2), and Ordering Information (see 8.6);

remove nonspecific test method language for Composition (see 3.1); and allow the use of the immediate prior specification

revision (see 8.4).

1. SCOPE

1.1 Form

This specification covers a leaded bronze in the form of sand and centrifugal castings (see 8.6).

1.2 Application

These castings have been used typically for bearings requiring excellent anti-friction properties and resistance to corrosion,

but usage is not limited to such applications. Alloy has good machinability under high speeds and heavy loads.

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

AMS2694 In-Process Welding of Castings

SAE INTERNATIONAL AMS4842™G Page 2 of 6

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 B824 General Requirements for Copper Alloy Castings

ASTM E18 Rockwell Hardness of Metallic Materials

ASTM E1220 Visible Penetrant Examination Using the Solvent-Removable Process

ASTM E1417/E1417M Liquid Penetrant Testing

ASTM E1742/E1742M Radiographic Examination

2.3 Definitions

Terms used in AMS are defined in AS7766.

3. TECHNICAL REQUIREMENTS

3.1 Composition

Shall conform to the percentages by weight shown in Table 1, determined in accordance with ASTM B824 or other analytical

methods approved by the purchaser:

Table 1 - Composition

Element (see 3.1.1 and 3.1.3)

Min

Max

Copper (see 3.1.2 and 3.1.5)

78.0

82.0

Tin

9.0

11.0

Lead

8.0

11.0

Nickel (incl Copper) (see 3.1.2)

0.50

Zinc

0.8

Antimony

0.50

Iron

0.15

Phosphorus

0.10

Sulfur

0.08

Aluminum

0.005

Silicon

0.005

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 In determining copper minimum, copper may be calculated as copper plus nickel.

3.1.3 Copper may be reported as the difference between the sum of results for all elements. When all named elements

in Table 1 are analyzed, the sum shall be 99.0% minimum, but such determination is not required for routine

acceptance of each lot.

3.1.4 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.

SAE INTERNATIONAL AMS4842™G Page 3 of 6

3.2 Condition

As cast.

3.3 Casting

Castings shall be produced in lots from metal conforming to 3.1. A lot shall be all castings produced from one furnace melt

or crucible melt except that, when two or more furnace melts or crucible melts or combination thereof are used to charge a

ladle for pouring, the castings therefrom shall constitute a lot. A lot shall be not more than 2000 pounds (907 kg) of castings.

3.4 Chemical Analysis Specimens

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

3.5 Properties

Castings shall conform to the following requirements:

3.5.1 Hardness

Shall be as follows, determined in accordance with ASTM E18:

3.5.1.1 Sand Castings

Not lower than 65 HRF.

3.5.1.2 Centrifugal Castings

Not lower than 75 HRF.

3.5.2 Structure

May show a uniform distribution of lead in the copper-tin matrix. Method of testing and standards for acceptance shall be

as agreed upon by the purchaser and producer (see 8.6).

3.6 Quality

3.6.1 Castings, as received by the purchaser, shall be uniform in quality and condition, sound, and free from foreign

materials and from imperfections detrimental to usage of the castings.

3.6.1.1 Castings shall have smooth surfaces and shall be cleaned sufficiently to permit penetrant examination.

3.6.2 Castings, when specified, shall be produced under radiographic control. This control shall consist of radiographic

examination of castings in accordance with ASTM E1742/E1742M until proper foundry technique, which will

produce castings free from harmful internal imperfections, is established for each part number and of production

castings as necessary to ensure maintenance of satisfactory quality.

3.6.3 Castings, when specified, shall be subjected to fluorescent penetrant inspection in accordance with

ASTM E1417/E1417M, to contrast dye penetrant inspection in accordance with ASTM E1220, or to both.

3.6.4 Radiographic, fluorescent penetrant, contrast dye penetrant, and other quality standards shall be as agreed upon

by the purchaser and producer (see 8.6).

3.6.4.1 When acceptance standards are not specified, the following applies: Castings shall meet Grade C of AMS2175,

and radiographic indications of gas holes, sand spots, and inclusions shall be cause for rejection when closer to

the edge than twice their maximum dimension.

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标签： #铸造 #MS #AMS

摘要：

SAE AMS 4842G-2025 是一项最新修订的航空航天材料规范，专门针对采用砂型铸造和离心铸造工艺生产的铅青铜合金，其成分为80%铜、10%锡、9.5%铅（UNS C93700）。该标准规定了铸造铅青铜的化学成分、机械性能、热处理要求及质量检测方法，广泛应用于制造高负荷、高耐磨及低摩擦系数的轴承、衬套、轴套和泵体等关键零件。C93700 合金因其优异的减摩性、抗咬合性和铸造流动性，常用于航空航天、船舶、重型机械及工业泵阀领域。本文档适用于需要确保材料在高温、高冲击或边界润滑条件下可靠性的

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SAE AMS 4842G-2025 铸造铅青铜砂和离心80Cu - 10Sn - 9.5Pb铸造 (UNS C93700)

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