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What does PH mean in stainless steel?

What is the pH value of stainless steel? In stainless steel, “PH” stands for “precipitation hardening.” Precipitation-hardened stainless steels are a class of stainless steel alloys known for their ability to be enhanced through heat treatment processes. This process is also known as age hardening or precipitation strengthening.

17-4ph stainless steel

17-4ph stainless steel vs 17-7ph stainless steel vs 15-5ph stainless steel

Property17-4ph Stainless Steel17-7 PH Stainless Steel15-5 PH Stainless Steel
Chromium (Cr) Content (%)15-1717-1914-15.5
Nickel (Ni) Content (%)3-56.75-7.752.5-4.5
Copper (Cu) Content (%)3-5Notable, 0.5-1.33.5-5.5
Aluminum (Al) Content (%)1.0-1.3
Niobium (Nb) Content (%)0.15-0.45
Carbon (C) Content (%)
Key CharacteristicsHigh strength and hardness, good corrosion resistance, good toughness, excellent mechanical properties.High strength and hardness, good corrosion resistance, excellent fatigue properties, good formability.High strength and hardness, excellent corrosion resistance, good toughness, good transverse ductility.
Typical ApplicationsAerospace, petrochemical, various high-strength and corrosion-resistant applications.Springs, washers, aircraft components, applications requiring high strength and corrosion resistance.Aerospace components, chemical processing equipment, applications requiring high strength and corrosion resistance.

17-4 PH, 17-7 PH, and 15-5 PH are all precipitation-hardening stainless steel alloys. They are known for their ability to be strengthened through a heat treatment process, which leads to improved mechanical properties. Here’s a comparison of these three stainless steel alloys:

  1. 17-4ph Stainless Steel:

    • Chemical Composition: It typically contains about 15-17% chromium, 3-5% copper, 3-5% nickel, and 0.07% carbon.
    • Key Characteristics:
      • High strength and hardness.
      • Good corrosion resistance.
      • Good toughness.
      • Excellent mechanical properties, making it suitable for a wide range of applications.
    • Applications: Aerospace, petrochemical, and various industries requiring high strength and corrosion resistance.
  2. 17-7ph Stainless Steel:

    • Chemical Composition: It contains approximately 17-19% chromium, 6.75-7.75% nickel, 1.0-1.3% aluminum, and 0.09% carbon.
    • Key Characteristics:
      • High strength and hardness.
      • Good corrosion resistance.
      • Excellent fatigue properties.
      • Good formability.
    • Applications: Springs, washers, aircraft components, and other applications requiring both high strength and corrosion resistance.
  3. 15-5 PH Stainless Steel:

    • Chemical Composition: It consists of about 14-15.5% chromium, 3.5-5.5% copper, 2.5-4.5% nickel, 0.05% carbon, and 0.15-0.45% niobium.
    • Key Characteristics:
      • High strength and hardness.
      • Excellent corrosion resistance.
      • Good toughness.
      • Good transverse ductility.
    • Applications: Aerospace components, chemical processing equipment, and other applications where a combination of high strength and corrosion resistance is required.

In summary, 17-4 PH, 17-7 PH, and 15-5 PH are similar in that they are all precipitation-hardening stainless steels with high strength and corrosion resistance. The choice among them depends on specific application requirements, with factors like desired mechanical properties, corrosion resistance, and formability playing a role in the selection process. Each of these alloys is valuable in different industries and applications.

What is 17-4ph stainless steel standard?

17-4ph stainless steel, also known as Type 630, is a precipitation-hardening martensitic stainless steel. It is defined by several standards, including:

  1. ASTM A693: Standard Specification for Precipitation-Hardening Stainless and Heat-Resisting Steel Plate, Sheet, and Strip. This specification covers the requirements for 17-4 PH stainless steel in the form of plate, sheet, and strip.

  2. AMS 5604: This is an Aerospace Material Specification that covers 17-4 PH stainless steel in various forms, such as bars, wire, forgings, and extrusions.

  3. AMS 5622: Another Aerospace Material Specification, it covers bars and wire in the 17-4 PH condition.

These standards ensure that 17-4 PH stainless steel meets specific requirements for its chemical composition, mechanical properties, and heat treatment processes, making it suitable for various applications, including aerospace, petrochemical, and other high-strength and corrosion-resistant uses. The specific standard to refer to can depend on the form and application of the material.

What is the difference between 17-4 PH stainless steel and 316 stainless steel?

17-4 PH (Precipitation-Hardening) stainless steel and 316 SS (Stainless Steel) are two different types of stainless steel with distinct properties and applications. Here are the key differences between them:


  • 17-4ph stainless steel: It contains significant amounts of chromium, nickel, copper, and small quantities of other elements. Copper is a key component contributing to its precipitation hardening.
  • 316 stainless steel: It is an austenitic stainless steel, primarily composed of chromium, nickel, and molybdenum, with smaller amounts of other elements. It lacks copper, which is present in 17-4 PH.

Precipitation Hardening:

  • 17-4ph stainless steel: It is a precipitation-hardening stainless steel, which means it gains strength through heat treatment. Aging at elevated temperatures causes the formation of hard precipitates, resulting in high strength.
  • 316 stainless steel: 316 SS is not precipitation-hardening. Its strength is achieved through cold working and solid solution strengthening.

Strength and Hardness:

  • 17-4ph stainless steel: 17-4 PH is known for its high strength and hardness. It can reach a tensile strength of over 1000 MPa after heat treatment.
  • 316 stainless steel: While 316 SS is moderately strong for a stainless steel, it has lower strength compared to 17-4 PH.

Corrosion Resistance:

  • 17-4ph stainless steel: It provides good corrosion resistance, but it may not be as corrosion-resistant as 316 SS, especially in environments with high chloride content.
  • 316 stainless steel: 316 SS is renowned for its excellent corrosion resistance, particularly in chloride-rich environments. It is often used in applications exposed to seawater and chemical solutions.

Magnetic Properties:

  • 17-4ph stainless steel: It exhibits magnetic properties and is ferromagnetic.
  • 316 stainless steel: 316 SS is typically non-magnetic in the annealed condition, making it suitable for applications where magnetism is undesirable.

Typical Applications:

  • 17-4ph stainless steel: Commonly used in aerospace, defense, and industrial applications where high strength and moderate corrosion resistance are required.
  • 316 stainless steel: Widely used in a variety of industries, including marine, chemical, food processing, and pharmaceuticals, due to its superior corrosion resistance.

In summary, the choice between 17-4ph stainless steel and 316 SS depends on the specific requirements of the application. 17-4ph stainless steel is preferred when high strength and moderate corrosion resistance are needed, while 316 SS is chosen for its excellent corrosion resistance in various corrosive environments.

Other issues you may be concerned about

  • There is no one-size-fits-all answer to this question. The best stainless steel grade varies based on factors like the environment, temperature, corrosion resistance, and mechanical properties required for a particular application.
  • Common stainless steel grades include 304, 316, 316L, 317, 410, 17-4 PH, and many more, each with its strengths and weaknesses.

Stainless steel 304 (SS 304) and 316 (SS 316) are both popular and versatile grades. The choice depends on the application:

  • SS 304: It offers good corrosion resistance in most environments and is cost-effective. It’s suitable for general applications, such as kitchen appliances and architectural cladding.
  • SS 316: It has superior corrosion resistance, especially in chloride-rich environments, making it suitable for marine, chemical, and pharmaceutical applications. It is often preferred when the application involves exposure to saltwater.
  • For high-temperature applications, austenitic stainless steels like SS 304 and SS 316 are common choices due to their good high-temperature properties.
  • SS 310 is specifically designed for high-temperature applications and offers excellent oxidation resistance. It is often used in furnaces, heat treatment equipment, and exhaust systems.
  • In extreme heat environments, nickel-based alloys like Inconel or Hastelloy may be preferred due to their exceptional high-temperature properties.
  • Yes, 17-4 stainless steel is typically magnetic. The magnetic properties of stainless steel are influenced by its composition. In the case of 17-4 stainless steel, it contains significant amounts of iron, which is a ferromagnetic material. As a result, 17-4 stainless steel is generally magnetic and exhibits magnetic behavior. However, it’s worth noting that the degree of magnetism can vary depending on factors such as the specific heat treatment and processing conditions used for the material.

Huaxiao Metal Corporation Limited——Professional supplier of special steel and other tool steel

Huaxiao Metal Corporation Limited is a reputable supplier specializing in special steel and various tool steel products. With a focus on providing high-quality materials to meet the diverse needs of customers, Huaxiao Metal Corporation has established itself as a reliable source for these types of steel products. Whether you require special steel for specific applications or tool steel for cutting, machining, or industrial purposes, they aim to offer a wide range of options to meet your requirements. Their commitment to quality and customer satisfaction makes them a valuable partner for those seeking specialized steel solutions.

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