17 4ph h900 hardness

17-4PH H900 stainless steel is widely used in various industries, including aerospace, defense, and oil and gas. In this article, we will delve into the characteristics and applications of 17-4PH H900 stainless steel, shedding light on its remarkable hardness.

The term “17-4PH H900 hardness” refers to a specific type of stainless steel alloy known as 17-4 precipitation-hardening stainless steel. The “H900” designation indicates that the alloy has undergone a heat treatment process called aging, which results in a specific level of hardness.

What is 17-4PH H900 Stainless Steel?

17-4PH H900 stainless steel is a precipitation-hardening martensitic stainless steel alloy. It is composed of iron, chromium, nickel, copper, and small amounts of other elements such as manganese, silicon, and niobium. The “H900” designation refers to the heat treatment process that the alloy undergoes to achieve its desired hardness.

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Heat Treatment Process:

The heat treatment process plays a crucial role in enhancing the hardness of 17-4PH stainless steel. The H900 treatment involves heating the alloy to a temperature of around 900°F (482°C) for a specific duration, followed by air cooling or oil quenching. This process transforms the microstructure of the alloy, resulting in a hardened material with excellent mechanical properties.

17 4PH H900 hardness

One of the key characteristics of 17-4PH H900 stainless steel is its exceptional hardness. After the H900 heat treatment, this alloy typically achieves a hardness of approximately 40 HRC (Rockwell C scale). This level of hardness is comparable to some tool steels, making 17-4PH H900 stainless steel suitable for applications that require high strength and wear resistance.

ConditionHardness BrinellHardness Rockwell
H1150-D255 min-311 maxC24-33

In the H900 condition, 17-4PH stainless steel has been heat-treated at a temperature of around 900°F (482°C) for a specific duration to achieve maximum hardness. The resulting hardness is typically around 40-45 HRC (Rockwell C scale), which is relatively high for stainless steel.

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Mechanical Properties:

Apart from its impressive hardness, 17-4PH H900 stainless steel exhibits excellent mechanical properties. It offers a combination of high tensile strength, good corrosion resistance, and moderate toughness. These properties make it a versatile material for various demanding applications.

ConditionUltimate Tensile Strength (PSI)0.2% Yield Strength (PSI)Elongation (% in 2in.)Reduction Of Area (%)


The remarkable hardness and mechanical properties of 17-4PH H900 stainless steel make it well-suited for a wide range of applications. Some notable applications include:

  • Aerospace components: The aerospace industry extensively uses 17-4PH H900 stainless steel for manufacturing critical components such as landing gear, engine parts, and structural components due to its high strength and corrosion resistance.
  • Defense equipment: This alloy finds applications in the defense sector for producing firearm components, missile parts, and armor plates, where hardness and strength are of utmost importance.
  • Oil and gas industry: 17-4PH H900 stainless steel is utilized in the oil and gas industry for manufacturing valves, pumps, and drilling equipment, thanks to its excellent corrosion resistance and high strength.
  • Medical devices: The medical field benefits from the hardness and corrosion resistance of 17-4PH H900 stainless steel in the production of surgical instruments, orthopedic implants, and dental tools.
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Conclusion: 17-4PH H900 stainless steel is a remarkable alloy known for its impressive hardness and mechanical properties. The heat treatment process it undergoes enhances its hardness, making it suitable for various demanding applications across industries. Whether in aerospace, defense, oil and gas, or medical fields, this alloy continues to prove its worth as a reliable and high-performance material.