ThePipingMart Blog Grades AISI 4815H Alloy Steel (UNS H48150) – Composition, Properties, and Uses

AISI 4815H Alloy Steel (UNS H48150) – Composition, Properties, and Uses

AISI 4815H

Different materials are used in various industries, including construction, automobile, and aerospace. A knowledgeable buyer knows that seeking durable, reliable, and cost-effective products is essential. One such material used widely in these industries is AISI 4815H. But what is it? In this blog, we will discuss all the critical aspects of AISI 4815H, from its composition and mechanical properties to its uses, heat treatment, and welding. Keep reading.

What is AISI 4815H?

AISI 4815H is an alloy steel primarily used for making components that need hardening and low-temperature stress-relieving capabilities. It is created by adding elements like Molybdenum, Chrome, and Nickel to improve strength, toughness, and hardenability. AISI 4815H is typically supplied in an annealed and machineable condition.

AISI 4815H Composition

The composition of AISI 4815H is fundamental to its unique properties. Its primary elements include:

  • Carbon (C): 0.13 – 0.18%
  • Manganese (Mn): 1.15 – 1.50%
  • Silicon (Si): 0.15 – 0.35%
  • Chromium (Cr): 0.70 – 0.90%
  • Molybdenum (Mo): 0.15 – 0.25%
  • Nickel (Ni): 1.40 – 1.70%
  • Phosphorus (P): 0.035% max
  • Sulfur (S): 0.040% max.

AISI 4815H Mechanical Properties

The mechanical properties of AISI 4815H make it an appealing choice for various engineering applications. The material is highly resistant to wear and tear due to its exceptional hardness, toughness, and core strength. Here are a few of AISI 4815H’s crucial mechanical properties:

  • Tensile Strength: 910 MPa
  • Yield Strength: 760 MPa
  • Elongation: 11% in 50mm

Other critical mechanical properties of AISI 4815H include excellent fatigue resistance, ductility, and toughness.

AISI 4815H Physical Properties

In addition to the mechanical properties, AISI 4815H has some physical properties that make it highly demanded in several industrial applications. These properties include a high melting point of 1425°C and a density of 7.85 g/cm3. AISI 4815H also has excellent machinability, making it easy to machine.

AISI 4815H Uses

AISI 4815H is helpful in various industries, including construction, automotive, aerospace, and tooling. It is often used as hardening steel in multiple components, including gears, hydraulic, and crankshafts. Due to its excellent resistance to wear and tear, AISI 4815H is also ideal for making drill bits, dies, and cutting tools.

AISI 4815H Corrosion Resistance

AISI 4815H has a reasonably low corrosion resistance compared to other alloys. Therefore, it is usually used in applications where the environment is not highly corrosive or corrosion resistance is not a significant concern. AISI 4815H can be coated with metals like Zinc or nickel to improve corrosion resistance.

AISI 4815H Heat Treatment

Heat treatment is an essential process that changes the physical and mechanical properties of AISI 4815H to make it more suitable for various applications. The heat treatment process usually involves annealing, hardening, and tempering. The annealing process softens the steel, making it more manageable to machine, while hardening increases its strength and resistance to wear.

AISI 4815H Machining

Machining AISI 4815H is relatively easy due to its excellent machinability. The material can be machined using various cutting tools, including drills, end mills, reamers, and taps. It is essential to use the correct cutting tool, coolant, and cutting speed for optimal results.

AISI 4815H Welding

When welding AISI 4815H, using the proper welding techniques and welding filler material is critical. The material can be welded using MIG, TIG, and stick welding techniques; low hydrogen welding rods are recommended. It is also vital to preheat the material adequately before welding and avoid rapid cooling after welding.


AISI 4815H is a unique alloy steel that has gained popularity in several industries due to its exceptional mechanical and physical properties. It is ideal for applications requiring complex, solid components and resists wear and tear. The material has excellent machinability and can be heat treated to improve its properties further. If you need to use AISI 4815H, it is crucial to understand its composition, mechanical and physical properties, uses, corrosion resistance, heat treatment, machining, and welding techniques. We hope this blog has provided you with all the information you need about AISI 4815H.

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