ThePipingMart Blog Grades ASTM A335 Grade P5 (UNS T51605) – Composition, Properties, and Uses

ASTM A335 Grade P5 (UNS T51605) – Composition, Properties, and Uses

ASTM A335 Grade P5 Pipe (UNS T51605)

UNS T51605 is a low-carbon chromium-molybdenum alloy steel with excellent toughness and weldability. This type of ASTM A335 P5/ASME SA335 P5 steel is commonly used in many industries due to its strength, corrosion resistance, heat resistance, and machinability. In this guide, we will provide you with an overview of the composition, chemical properties, mechanical properties, physical properties, welding, heat treatment, corrosion resistance, and uses of alloy steel grade P5b.

What Forms is ASTM A335 Grade P5 Available at Piping Mart?

  • ASTM A335 Grade P5 Pipes
  • ASTM A335 Grade P5 Tubes
  • ASTM A335 Grade P5 Bars
  • ASTM A335 Grade P5 Sheet
  • ASTM A335 Grade P5 Plates

ASTM A335 p5 Chemical Composition

The composition of UNS T51605 includes 0.12 – 0.20% carbon; 0.40 – 0.60% manganese; 1.20 – 1.50% chromium; 0.15 – 0.25% molybdenum; 0.35 – 0.45% silicon; and less than or equal to 0.030% sulfur and phosphorus each. Additionally, ASTM A335 P5 pipe material may contain other elements, such as vanadium and nickel, in trace amounts (less than or equal to 0.10%).

Element Content (%)
Fe 95
C 0.1
Mn 0.20-0.60
Si 0.4
Cr 2.00-2.50
Ni 0.35
Cu 0.25
P 0.03
S 0.03

ASTM A335 p5 Chemical Properties

The chemical properties of ASTM A335 p5 make it resistant to corrosion in a wide range of environments, including acids, alkalis, oxidants, and reducing agents as well as high temperatures (up to 1000°F). Additionally, all Chrome Moly Alloy A335/SA335 P5 has excellent weldability when properly heat treated, making it suitable for use in pressure vessels and piping systems where weld integrity is critical for safe operation requirements such as those in the oil & gas industry.

ASTM A335 p5 Mechanical Properties

The mechanical properties of ASTM A335 p5 are impressive as well—it has a minimum tensile strength of 586 MPa (85 ksi) at room temperature with good ductility thanks to its low carbon content (less than or equal to 0.20%). Additionally, it has good impact toughness even at low temperatures (-150°F). Furthermore, this type of steel A335/SA335 P5 can be hardened through tempering processes which further increases its strength and wear resistance, making it ideal for applications that require high levels of durability, such as die manufacturing or automotive components that must endure extreme conditions over long periods of time without failure or significant degradation due to external forces or environmental factors such as temperature fluctuations or exposure to corrosive substances like saltwater/ocean air, etc.

Properties Metric Imperial
Poisson’s ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30458 ksi

ASTM A335 p5 Physical Properties

The physical properties of ASTM A335 p5 include a density range between 7800-8100 kg/m3 with a melting point between approximately 1475-1550 °C (2700-2822 °F). Additionally, this type of steel exhibits excellent thermal conductivity (~43 W/m•K) and electrical resistivity (~7 μΩ•cm). It also has good magnetic permeability (~1), making it suitable for use in various electronic applications where magnetic shielding may be necessary depending on the application requirements.

Properties Metric Imperial
Density 7.85 g/cm3 0.281 lb/in3

Alloy Steel Grade P5b Uses

ASTM A335 p5 is known for its strength and versatility, making it ideal for various uses. Its extreme resistance to heat, corrosion, and impact helps make it especially useful in the automotive, machine tool, and power industries. This incredibly hard metal is used extensively in turbine blades that are able to withstand the toughest conditions. In addition to its strength, Alloy Steel Grade P5 b’s lower carbon content gives it a greater ability to be welded into complex shapes or sizes, making it perfect for custom engineering projects. From consumer products like car engines and airplane parts to sophisticated medical implants, Alloy Steel Grade P5b can handle just about any challenge.

  • Alloy steel grade P5b is a chromium-molybdenum alloy used in various applications.
  • The chromium content in alloy steel grade P5b helps improve the material’s corrosion resistance.
  • The molybdenum content in alloy steel grade P5b helps improve the material’s strength and hardness.
  • Alloy steel grade P5b is often used in applications that require high temperatures, such as boiler tubes and furnace components.
  • Alloy steel grade P5b is also often used in oil and gas applications, such as valves and fittings.
  • The high strength and hardness of alloy steel grade P5b make it ideal for use in construction applications, such as bridges and buildings.
  • Alloy steel grade P5b can also be used in various other applications, such as gears, shafts, and bearings.
  • Alloy steel grade P5b is available in various forms, including plate, sheet, strip, bar, and pipe.
  • SA 335 gr P5 alloy steel is typically supplied in the annealed condition.
  • Annealing alloy steel grade P5b can be done at temperatures ranging from 1650 degrees Fahrenheit to 2050 degrees Fahrenheit.


ASTM A335 p5 can be welded using either shielded metal arc welding (SMAW) or gas metal arc welding (GMAW) processes, provided that proper preheating is done before welding begins (>250°F). Heat Treatment: Heat treatment is required for proper tempering, which allows the material’s mechanical properties to be enhanced by increasing its hardness without affecting its ductility too much—this process should not exceed 1050°F if optimal results are desired; otherwise, brittleness can occur.

Corrosion Resistance

This type of steel offers superior corrosion resistance compared with other types since its chromium content helps protect against oxidation. In contrast, its low sulfur content helps reduce pitting due to acidic solutions. Uses: Due to its unique combination of chemical/physical/mechanical/thermal characteristics mentioned above—alloy steel grade P5B is used widely in various industries, including aerospace engineering, automotive manufacturing, oil & gas production, agricultural equipment manufacturing, medical device manufacturing, food processing machinery construction, power generation equipment manufacturing, construction projects involving heavy machinery parts fabrication, etc.

Heat Treatment

Alloy Steel Grade P5 is an incredibly durable and versatile steel that can be customized through heat treatment. This specialty steel is able to undergo a process of rapid thermal hardening and tempering that allows for various levels of hardness and strength to be achieved. The process involves raising the temperature in a controlled vacuum chamber to specific intervals before cooling it. This method allows the microstructure of Steel Grade P5b to be fine-tuned, making it an exceptionally resistant material perfect for any construction or engineering application.

Heat Resistance

Alloy Steel Grade P5b is a high-grade steel that is widely known for its exceptional heat resistance. The key factor behind this toughness and resilience to heat is its composition which makes it far more durable and dependable than many other types of steel. It keeps its shape under demanding conditions and remains stable and safe from oxidation, despite fluctuating temperatures of extreme hot or cold. Due to this, Alloy Steel Grade P5b is used in a number of industrial operations, including oil refining, petrochemical production, and the manufacture of pressure vessels and piping components. Even though Alloy Steel Grade P5b tends to be expensive compared to other steel options, its capital cost is worth investing in due to its safety and longevity.


Creating precisely machined parts from alloy steel Grade P5b requires skill and expertise. Many advanced properties make it an ideal choice as it offers resistance to high-temperature creep deformation, oxidation, corrosion and wear. It is also suitable for applications requiring elevated toughness combined with long-term fatigue strength. As such, alloy steel Grade P5b is used throughout the automotive industry for parts ranging from automotive transmission tools to drive shafts. Specialized machining processes are needed to achieve the desired surface finish, dimensional accuracy, and optimal performance in these types of products. To gain maximum benefit from this high-quality material, seek out a reliable supplier who provides services for precise machining for alloy steel Grade P5b components.


In conclusion—alloy steel grade P5B is an excellent choice when looking for an alloy that offers superior strength combined with good corrosion resistance along with moderate ductility retention after tempering processes have been applied. Its ability to withstand extreme temperatures without significant degradation makes it suitable for various industrial applications requiring high-performance components capable of enduring tough conditions over lengthy periods without failure… Proper quality control should always be done before any large-scale production runs utilizing this material so optimal results are achieved every time!

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