SAE AMS 5643-H1075-2022

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For more information on this standard, visit

https://www.sae.org/standards/content/AMS5643/H1075/

AEROSPACE

MATERIAL SPECIFICATION

AMS5643™/H1075

Issued 2022-01

Steel, Corrosion Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings

16Cr - 4.0Ni - 0.30Cb (Nb) - 4.0Cu

Solution and Precipitation Heat Treated (H1075)

(Composition similar to UNS S17400)

RATIONALE

AMS5643/H1075 is a new specification for the purchase of corrosion resistant steel product in the solution and precipitation

heat treated (H1075) condition.

1. SCOPE

1.1 Form

This specification covers a corrosion-resistant steel product 8 inches (203 mm) and under in nominal diameter, thickness

or for hexagons, least distance between parallel sides, and having a maximum cross-sectional area of 64 in2 (413 cm2) in

the solution and precipitation heat treated (H1075) condition

1.1.1 The aged product may be supplied directly by a mill or by a producer another entity performing the functions of a

producer as defined in AS6279. The latter would be accomplished by precipitation heat treatment of solution treated

material previously certified to AMS5643. The entity assuming responsibility for the aging operation is designated

the producer of AMS5643/H1075.

1.2 Application

These products have been used typically for parts requiring corrosion resistance and high strength up to 600 °F (316 °C),

but usage is not limited to such applications (see 8.1).

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

AMS2759/3 Heat Treatment, Precipitation-Hardening Corrosion-Resistant, Maraging, and Secondary Hardening Steel

Parts

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SAE INTERNATIONAL AMS5643™/H1075 Page 2 of 5

AMS2761 Heat Treatment of Steel Raw Materials

AMS5643 Steel, Corrosion Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings, 16Cr - 4.0Ni - 0.30Cb (Nb)

- 4.0Cu, Solution Heat Treated, Percipitation Hardenable

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

3. TECHNICAL REQUIREMENTS

3.1 Composition

Shall be in accordance with AMS5643.

3.2 Condition

Shall be in accordance with AMS5643, and the following:

3.2.1 The product shall be supplied in the precipitation hardened (H1075) heat treat condition.

3.2.2 Bar shall not be cut from plate (see also 4.3.3).

3.3 Heat Treatment

Shall be in accordance with AMS5643 and the following:

3.3.1 Precipitation Heat Treatment

3.3.1.1 Shall be in accordance with the requirements applicable to either AMS2761 or AMS2759/3 at the producer’s

option, except acceptance testing and criteria shall be as specified in 3.4.1.3.

3.3.1.2 When product certified as AMS5643 (solution treated material) is precipitation heat treated by an entity other than

the producer of the original product, the heat treatment source shall be accredited by a recognized industry

agency for stainless steel heat treatment acceptable to the purchaser.

3.3.2 Stress Relief

3.3.2.1 A stress relief heat treatment after precipitation heat treatment is optional. When performed, stress relief shall be

accomplished by heating to 975 °F ± 25 °F (524 °C ± 14 °C) and soaking for at least 1 hour plus 1 hour additional

for each inch (25 mm) of thickness or fraction thereof greater than 1 inch (25 mm). When load thermocouples are

used, the soaking time shall be at least 1 hour.

3.3.2.2 Stress relieving as above may be performed after straightening to meet dimensional tolerances of AMS2241

unless prohibited by purchaser or cognizant engineering organization (see 8.3) but must still meet all properties

(see 3.4).

3.4 Properties

3.4.1 All products shall conform to the following requirements:

3.4.1.1 Macrostructure

Shall be in accordance with AMS5643.

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SAE INTERNATIONAL AMS5643™/H1075 Page 3 of 5

3.4.1.2 Microstructure

Shall be in accordance with AMS5643.

3.4.1.3 Tensile Properties

Shall be in accordance with the following:

3.4.1.3.1 Bars

Bars, 8 inches (203 mm) and under in nominal diameter, thickness or for hexagons, least distance between parallel sides,

and having a maximum cross-sectional area of 64 in2 (413 cm2) shall be as shown in Table 1. Tensile testing shall be

performed in accordance with ASTM A370.

3.4.1.3.1.1 Unless otherwise specified, the strain rate shall be set at 0.005 in/in/min (0.005 mm/mm/min) and maintained

within a tolerance of ±0.002 in/in/min (0.002 mm/mm/min) through 0.2% offset yield strain. The strain rate

after yield may be increased to any value up to 0.5 in/in/min (or 0.5 mm/mm/min) or equivalent crosshead

speed as a function of gage length.

Table 1A - Tensile properties, inch/pound units

Condition

Tensile

Strength

ksi

Minimum

Yield Strength

at 0.2% Offset

ksi

Minimum

Elongation in

2 Inches or 4D

Minimum

Reduction

of Area

H1075

145-180

125

Note: Properties have been taken from the response to heat treatment requirements of AMS5643

and were not independently substantiated using SAE AMS procedures.

Table 1B - Tensile properties, SI Units

Condition

Tensile

Strength

MPa

Minimum

Yield Strength

at 0.2% Offset

MPa

Minimum

Elongation in

50.8 mm or 4D

Minimum

Reduction

of Area

H1075

999-1242

861

Note: Properties have been taken from the response to heat treatment requirements of AMS5643

and were not independently substantiated using SAE AMS procedures.

3.4.1.3.2 All other product forms

The property requirements of 3.4.1.3.1 shall apply. Test plans shall be as agreed upon between producer and purchaser.

3.4.1.3.3 When the ultimate tensile strength exceeds 180 ksi (1242 MPa), one additional aging cycle may be performed.

The set temperature for the additional aging may be higher than 1075 °F (579 °C), but not more than 25 °F

(14 °C) higher. The soaking time shall be not more than the original precipitation heat treatment cycle.

3.4.1.3.4 When the tensile properties as specified in Table 1 are not met, it is permissible to again perform solution heat

treatment in accordance with AMS5643 and precipitation heat treatment to the requirements specified in 3.3,

and retest.

3.4.1.3.5 Tensile property requirements for product outside of the range covered by 1.1 shall be agreed upon between

purchaser and producer (see also 4.3.4).

3.4.1.4 Hardness

Not applicable.

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摘要：

SAE AMS 5643-H1075-2022 是一项由国际自动机工程师学会（SAE International）发布的航空航天材料规范，专注于H1075状态下的耐腐蚀钢（通常为17-4PH马氏体不锈钢）的棒材、线材、锻件及管材的技术要求。该标准替代了旧版AMS 5643系列中的相关修订，明确了材料在沉淀硬化热处理后的力学性能、化学成分、显微组织及质量控制流程，适用于航空航天结构件、紧固件及高应力环境下的关键零部件。H1075状态代表了在1075°F（约579°C）下进行沉淀硬化处理后的材料性能

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