ThePipingMart Blog Grades Stainless Steel 450 (UNS S45000) – Composition, Properties, and Uses

Stainless Steel 450 (UNS S45000) – Composition, Properties, and Uses

Stainless Steel 450

Stainless steel is one of the most versatile and widely used materials in manufacturing and industrial applications. It offers excellent corrosion resistance, durability, and strength compared to other materials. Among the various types of stainless steel, stainless steel 450 stands out for its unique composition, mechanical and physical properties, and applications. In this blog post, we will explore the basics of stainless steel 450 and its features that make it valuable in different industries.

Stainless Steel 450 Composition

Stainless steel 450 is a martensitic alloy that contains 11% of chromium and 0.75% carbon. It also includes other elements such as nickel, silicon, and manganese to improve its corrosion resistance, hardness, and strength. The combination of these elements gives stainless steel 450 its unique properties.

Element Content (%)
Iron, Fe 74.3
Chromium, Cr 15
Nickel, Ni 6
Copper, Cu 1.5
Silicon, Si 1.0
Manganese, Mn 1.0
Molybdenum, Mo 0.75
Niobium, Nb (Columbium, Cb) 0.40
Carbon, C 0.050
Phosphorous, P 0.030
Sulfur, S 0.030

Stainless Steel 450 Mechanical Properties

Stainless steel 450 boasts impressive mechanical properties, including high tensile strength, yield strength, and hardness. It also has excellent wear resistance and is ideal for abrasion-resistance applications.

Properties Metric Imperial
Tensile strength 986 MPa 143000 psi
Yield strength (@ strain 0.200%) 814 MPa 118000 psi
Bulk modulus (typical for steel) 166 GPa 24100 ksi
Shear modulus (typical for steel) 83.9 GPa 12200 ksi
Charpy impact 125 – 141 J 92.2 – 104 ft-lb
Elongation at break (gage length is 4 times specimen diameter) 13.30% 13.30%
Hardness, Brinell (converted from Rockwell C hardness) 278 278
Hardness, Knoop (converted from Rockwell C hardness) 296 296
Hardness, Rockwell C 28 28
Hardness, Vickers (converted from Rockwell C hardness) 287 287

Stainless Steel 450 Physical Properties

Regarding physical properties, stainless steel 450 has a density of 7.74 g/cm³ and a melting point of 1415°C. Stainless steel 450 is a popular material in various industries due to its exceptional physical properties. This alloy is known for its high strength, corrosion resistance, and durability. With a unique combination of nickel, chromium, and molybdenum, stainless steel 450 exhibits significant oxidizing and reducing media resistance, making it an excellent choice for harsh environments. Its physical properties make it ideal for oil and gas, petrochemical, and aerospace applications. In summary, stainless steel 450’s physical properties make it a superior choice for many industries that require strength, resistance, and long-lasting durability.

Properties Metric Imperial
Density 7.80 cm³ 0.282 lb/in³

Stainless Steel 450 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient ( @ 20-100°C/68-212°F) 10.1 µm/m°C 5.61 µin/in°F
Thermal conductivity (typical value for stainless steel) 20.7 W/mK 144 BTU in/hr.ft².°F

Stainless Steel 450 Equivalent

Other designations that are equivalent to 450 stainless steel alloy include:

  • AMS 5763
  • AMS 5773
  • AMS 5859
  • AMS 5863
  • ASTM A564 (XM-25)
  • ASTM A693 (XM-25)
  • ASTM A705 (XM-25)

Stainless Steel 450 Uses

Stainless steel 450 is commonly used in various industries due to its unique properties. It is ideal for manufacturing components that require high strength, durability, and corrosion resistance. Some typical applications of stainless steel 450 include aircraft components, cutting tools, surgical instruments, dental devices, and nozzle valves. Its high wear resistance properties also make it ideal for manufacturing moulds and dies.

Stainless Steel 450 Corrosion Resistance

One of the primary reasons stainless steel 450 is popular is its excellent corrosion resistance properties. Chromium and other alloying elements provide a protective layer on the metal surface that shields it from corrosion-causing agents. It can withstand the most corrosive environments, including high-temperature and high-pressure settings.

Stainless Steel 450 Heat Treatment

Stainless steel 450 can be heat-treated to improve its mechanical properties. It can be hardened through quenching and tempering to achieve desired hardness and strength.

Stainless Steel 450 Machining

Stainless steel 450 is also easy to machine and can be shaped into various forms without losing its properties. However, its high hardness makes it challenging to machine, requiring specialized techniques.

Stainless Steel 450 Welding

Stainless steel 450 can be welded using various techniques, including gas tungsten arc welding, gas metal arc welding, shielded metal arc welding, and plasma arc welding. However, it requires preheating before welding and should be cooled slowly to prevent cracking.


Stainless Steel 450 is a remarkable material with unique composition, mechanical properties, and applications. Its high strength, durability, wear resistance, and corrosion resistance make it an ideal choice in various aerospace, medical, and automotive industries. Understanding the properties and characteristics of stainless steel 450 is crucial in selecting the suitable material for your application.

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