ThePipingMart Blog Grades AMS 5642 Stainless Steel – Composition, Properties, and Uses

AMS 5642 Stainless Steel – Composition, Properties, and Uses

AMS 5642

AMS 5642 is a type of stainless steel sought after in many industries for its durability, strength, and resistance to corrosion. This alloy is designed to withstand extreme environments such as high temperatures, acidic or corrosive solutions, and heavy loads. This blog post will delve deeper into the properties, composition, uses, hardness, and heat treatment of AMS 5642.

What is AMS 5642?

AMS 5642 (also known as 17-4 PH Stainless Steel) is a specification that outlines the requirements for corrosion-resistant stainless steel bars and wire intended for use in the aerospace industry. This type of stainless steel is highly sought after for its ability to withstand harsh environments and maintain its strength at high temperatures – characteristics that are essential in aerospace applications. The specifications outlined in AMS5642 ensure that the stainless steel meets strict criteria for chemical composition, mechanical properties, and microstructure. With its remarkable properties and stringent quality control measures, it is no wonder that AMS 5642 has become a widely used standard in the aerospace industry.

What Form is AMS 5642 Available at Piping Mart?

  • Screws

AMS 5642 Composition

AMS 5642 sheet is a type of martensitic stainless steel comprising chromium, molybdenum, nickel, and carbon. Combining these components gives the alloy exceptional resistance to corrosion, strength, and toughness. It has higher nickel and molybdenum levels than other grades of stainless steel alloys, making it ideal for use in environments with high temperatures and acidic solutions.

Chemical Element % Present
Carbon (C) 0.0 – 0.07
Chromium (Cr) 15.00 – 17.00
Manganese (Mn) 0.0 – 1.50
Silicon (Si) 0.0 – 0.70
Phosphorous (P) 0.0 – 0.04
Sulphur (S) 0.0 – 0.03
Nickel (Ni) 3.00 – 5.00
Copper (Cu) 3.00 – 5.00
Molybdenum (Mo) 0.0 – 0.60
Niobium (Columbium) (Nb) 0.0 – 0.45
Iron (Fe) Balance

AMS 5642 Physical Properties

This alloy exhibits a good balance of physical properties such as hardness, strength, and flexibility. The density of AMS 5642 is 7.8 g/cm^3, which is relatively high. It has a melting point of 1450-1510°C and a boiling point of 2810°C, making it highly heat-resistant. This alloy’s coefficient of thermal expansion is 14.3 µm/m°C, which is relatively low. Its thermal conductivity is 24.9W/mK, which makes it an excellent heat conductor.

Physical Property Value
Density 7.75 g/cm³
Thermal Expansion 10.8 x10^-6 /K
Modulus of Elasticity 196 GPa
Thermal Conductivity 18.4 W/m.K
Electrical Resistivity 0.8 x10^-6 Ω .m

AMS 5642 Mechanical Properties

The mechanical properties of this alloy depend on the heat treatment it undergoes. Its annealed tensile strength is around 620 MPa, and its yield strength is about 300 MPa. However, after heat treatment, its tensile strength can increase up to 1950 MPa, and its yield strength can increase to 1400 MPa. Its elongation at break is 20%, and its hardness is 25HRC in its annealed state, while after heat treatment, its hardness can reach up to 45HRC.

Properties Metric Imperial
Shear modulus 77.4 GPa 11200 ksi
Elastic modulus 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Hardness, Brinell 352 352
Hardness, Knoop (estimated from Rockwell C) 363 363
Hardness, Rockwell C 36 36
Hardness, Vickers (estimated from Rockwell C) 349 349

AMS 5642 Equivalents

AISI 630 ASTM A693 (630) AMS 5342 MIL-S-81506
AMS 5604 ASTM A705 (630) AMS 5343 SAE J467 (17-4PH)
AMS 5622 MIL C-24111 AMS 5344 ASME SA705
AMS 5643 MIL P-47183 AMS 5355 ASME SA564
ASTM A564 (630) MIL S-81591 AMS 5825

AMS 5642 Uses

This alloy is widely used in the aerospace, nuclear, and chemical industries. Its excellent resistance to a wide range of chemicals and temperatures makes it an ideal material for exhaust systems in aircraft, chemical reactors and tanks, and tubing for heat exchangers. It is also used in springs, bearings, valve stems, and other applications where strength and toughness are essential.

AMS 5642 Hardness

The hardness of AMS 5642 depends on the heat treatment it undergoes. The alloy in its annealed state has a hardness of around 25HRC, while after heat treatment, its hardness can increase to 45HRC. The high hardness of this alloy makes it ideal for applications that require high wear resistance, such as bearings, valve stems, and pump parts.

AMS 5642 Heat treatment

AMS 5642 plate can be heat treated to increase its strength and toughness. Heat treatment involves heating the alloy to a specific temperature, holding it at that temperature for a specified amount of time, and then rapidly cooling it to room temperature. This process can be repeated several times to achieve the desired properties. After heat treatment, this alloy exhibits excellent strength and wear resistance.


AMS 5642 is a type of martensitic stainless steel that exhibits excellent strength, toughness, and resistance to corrosion. Its composition, physical properties, and mechanical properties make it a versatile material widely used in various industries. It is an ideal material for applications that require high strength, toughness, and wear resistance. With the right heat treatment, AMS 5642 can be tailored to meet specific requirements, making it a popular choice for various applications.

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