ThePipingMart Blog Grades AMS 5630 Stainless Steel – Composition, Properties, and Uses

AMS 5630 Stainless Steel – Composition, Properties, and Uses

AMS 5630

Stainless steel is one of the most durable and versatile materials used in various aerospace, automotive, and medical industries. One of the popular stainless steel grades is AMS 5630, which offers excellent strength, toughness, and corrosion resistance. This blog post will explore the composition, physical and mechanical properties, uses, hardness, and heat treatment of AMS 5630.

What is AMS 5630?

AMS 5630 also known as 440C Stainless Steel) is a type of stainless steel revered for its excellent corrosion resistance properties. This type of stainless steel is commonly used in various industries, including aerospace, automotive, and medical. It has high flexibility and can be easily formed and welded, making it an ideal choice for applications that require intricate designs. Because of these properties, AMS 5630 pipe is a popular choice for applications where strength, durability, and resistance to harsh environments are crucial. It is considered premium-grade stainless steel and is often used in high-performance applications where failure is not an option. Whether you are building a rocket or a medical device, AMS5630 is the go-to material for engineers and manufacturers who must create reliable and long-lasting products.

What Form is AMS 5630 Available at Piping Mart?

  • Nut
  • Bar
  • Bolt
  • Pipe
  • Screw
  • Tubing
  • Valves
  • Washers
  • Flanges
  • Fasteners
  • Electrodes
  • Stud Bolts
  • Sheet Plates
  • Round Pipes
  • Sheet Pipes
  • Pipe Fittings
  • Forged Fitting
  • ERW Pipes
  • Stud Bolts

AMS 5630 Composition

AMS 5630 is an austenitic stainless steel composed of chromium, nickel, and molybdenum. It has a chemical composition of 17-19% chromium, 8-10% nickel, and 2-3% molybdenum. Adding molybdenum provides better corrosion resistance, while nickel enhances the toughness and flexibility of the material.

Element Content (%)
Iron, Fe 79.15
Chromium, Cr 17
Carbon, C 1.1
Manganese, Mn 1
Silicon, Si 1
Molybdenum, Mo 0.75

AMS 5630 Physical Properties

This stainless steel grade has a density of 7.87 g/cm3, a melting point of 1400-1450°C, and a thermal conductivity of 14.6 W/mK at room temperature. Additionally, it offers high-temperature strength and excellent resistance to oxidation and scaling.

Properties Metric Imperial
Density 7.80 cm³ 0.282 lb/in³
Melting point 1483°C 2700°F

AMS 5630 Mechanical Properties

AMS 5630 has remarkable mechanical properties such as tensile strength, yield strength, and elongation. It has a tensile strength of 760 MPa, yield strength of 345 MPa, and an elongation of 56%. Moreover, this grade has a low coefficient of thermal expansion, making it ideal for high-temperature applications.

Properties Metric Imperial
Tensile strength 760-1970 MPa 110000-286000 psi
Yield strength (@ strain 0.200%) 450-1900 MPa 65300-276000 psi
Bulk modulus 166 GPa 24100 ksi
Shear modulus 83.9 GPa 12200 ksi
Elastic modulus 200 GPa 29008 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break 2-14 % 2-14 %
Hardness, Rockwell B (converted from Brinell hardness) 97 97

AMS 5630 Equivalents

  • AMS 5618
  • AMS 5630
  • AMS 5880
  • ASTM A276
  • ASTM A314
  • ASTM A473
  • ASTM A493
  • ASTM A580
  • DIN 1.4125
  • QQ S763
  • MIL-S-862
  • SAE 51440C
  • SAE J405 (51440C)

AMS 5630 Thermal Properties

Properties Metric Imperial
Thermal expansion co-efficient 10.2 µm/m°C 5.67 µin/in°F
Thermal conductivity 24.2 W/mK 168 BTU in/hr.ft².°F

AMS 5630 Uses

This stainless steel grade is commonly used in various applications such as aircraft parts, surgical instruments, pump shafts, and chemical processing equipment. Due to its excellent corrosion resistance, it is also used in marine applications, offshore oil rigs, and seawater desalination plants.

AMS 5630 Hardness

AMS 5630 has a Rockwell hardness of B90, which means it has a moderate hardness level. This property makes it easier to machine, form, and weld.

AMS 5630 Heat treatment

AMS 5630 plate can be heat treated to enhance its mechanical properties. The standard treatment for this grade is solution annealing at 1010-1150°C, followed by quenching in water or oil. This process helps soften the steel and provides high strength, flexibility, and toughness.

AMS 5630 Density

Density is a measure of an object’s mass per unit volume. Understanding the density of materials such as steel can be crucial in engineering design and manufacturing. This is where AMS 5630 comes in. AMS 5630 is a high-performance stainless steel alloy used in various applications, including aerospace and defence. Knowing the density of this alloy is important for understanding its strength-to-weight ratio and its suitability for multiple applications. As a material with excellent corrosion resistance, high strength, and good mechanical properties, AMS 5630 is a highly desirable option for many industries. Whether you’re a designer, engineer, or manufacturer, understanding the density of this particular material is essential for ensuring that your products are built to last.


AMS 5630 is highly versatile stainless steel, popular in various industries due to its strength, durability, and corrosion resistance. It is composed of chromium, nickel, and molybdenum, which enhance its mechanical and physical properties. AMS 5630 can be used in various applications, including aircraft parts, surgical instruments, and chemical processing equipment. Its moderate level of hardness, along with its great heat treatment capability, makes it easy to machine, form and weld. If you’re looking for a durable and reliable material for your industrial processes or projects, consider choosing AMS 5630 stainless steel.

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