ThePipingMart Blog Grades AMS 7012 Stainless Steel – Composition, Properties, and Uses

AMS 7012 Stainless Steel – Composition, Properties, and Uses

AMS 7012

AMS 7012 is a low-carbon, high-alloy steel commonly used in aerospace applications. It’s unique composition and physical properties make it special, offering exceptional strength, toughness, and durability. This blog post will explore this remarkable steel alloy in detail, delving into its composition, physical and mechanical properties, uses, hardness, and heat treatment techniques.

What is AMS 7012?

AMS 7012 (also known as 17-4 PH Stainless Steel) is the standard specification for reusable ballistic-resistant body armour, and it’s an essential requirement for anyone looking to manufacture or use such products. The standard lays out stringent testing requirements to ensure that the armour can offer reliable protection against bullets and other high-velocity projectiles. Aside from the core requirements, the specification also defines various aspects of the armor, such as its shape, curvature, and thickness. This allows for consistency in production, which ultimately means that the end-users can feel confident that their gear will perform as expected. Overall, AMS7012 ensures that ballistic-resistant body armour is made to the highest possible standards, keeping individuals safe as they do their duties.

What Form is AMS 7012 Available at Piping Mart?

  • Screws

AMS 7012 Composition

AMS 7012 material is a low-carbon, high-alloy steel primarily composed of iron, carbon, chromium, nickel, molybdenum, and vanadium. The percentage of each element in the alloy varies slightly, with a typical composition being 0.11% carbon, 15% chromium, 4% nickel, 1% molybdenum, and 0.50% vanadium. An increased nickel content increases the material’s corrosion resistance and toughness while adding vanadium enhances its wear resistance and high-temperature strength.

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 7012 Physical Properties

AMS 7012 sheet possesses exceptional physical properties, with a density of 7.86 g/cm³, a melting point of 1399°C, and a thermal conductivity of 28.6 W/m*K. It offers high-temperature strength with a maximum operating temperature of 593°C (1100°F), which makes it ideal for aerospace applications susceptible to extreme temperature variations. The material also exhibits excellent resistance to corrosion, oxidation, and thermal shock.

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 7012 Mechanical Properties

AMS 7012 welding wire boasts outstanding mechanical properties such as high tensile, yield, and ultimate strength, with a typical tensile strength of 2030 MPa, yield strength of 1900 MPa, and an ultimate tensile strength of 2200 MPa. Its high strength and superior flexibility, and toughness make it perfect for use in high-stress structural components in aircraft and other specialized applications.

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 7012 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 7012 Uses

Due to its unique composition and exceptional physical and mechanical properties, AMS 7012 finds use in several industries, such as aerospace, defence, and automotive applications. It is commonly used in manufacturing turbine parts, engine components, rocket nozzles, and structural supports for high-stress applications.

AMS 7012 Hardness

AMS 7012 has a Rockwell hardness of approximately 59 HRc, which makes it extremely tough and wear-resistant. The alloy offers excellent resistance to abrasion and wear, ensuring that it maintains its integrity under high-stress conditions.

AMS 7012 Heat Treatment

AMS 7012 is typically quenched and tempered to enhance its hardness, strength, and durability. The quenching process, followed by tempering, strengthens the material to withstand multiple thermal and mechanical stresses. This heat-treatment process ensures that the material attains the desired mechanical properties, such as increased strength, hardness, and flexibility, making it ideal for specialized applications.


AMS7012 is a remarkable steel alloy with exceptional physical and mechanical properties, making it a go-to material for specialized applications. It boasts tremendous strength, flexibility, toughness, and wear resistance, making it ideal for high-stress structural applications in the aerospace, defence, and automotive industries. Understanding the unique composition and physical and mechanical properties of AMS 7012 material is crucial when selecting the ideal material for your specific application, ensuring that your components offer maximum performance and reliability.

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