17-4 PH Investment Casting

17-4 PH Stainless Steel: A Versatile Alloy

17-4 PH stainless steel, also known as AISI Type 630, is a precipitation-hardening stainless steel that provides high strength and hardness, excellent corrosion resistance, and exceptional mechanical properties. This versatile alloy is ideal for various industries, including aerospace, chemical processing, and oil and gas. The name “17-4” represents its chemical composition: 17% chromium and 4% nickel, with additional elements such as copper and niobium contributing to its unique properties.

Table 1: Chemical Composition of 17-4 PH Stainless Steel

Element Percentage
Chromium (Cr) 15.0 – 17.5%
Nickel (Ni) 3.0 – 5.0%
Copper (Cu) 3.0 – 5.0%
Carbon (C) ≤ 0.07%
Manganese (Mn) ≤ 1.0%
Silicon (Si) ≤ 1.0%
Phosphorus (P) ≤ 0.04%
Sulfur (S) ≤ 0.03%
Niobium (Nb) + Tantalum (Ta) 0.15 – 0.45%

Table 2: Mechanical Properties of 17-4 PH Stainless Steel

Condition Tensile Strength (ksi) Yield Strength (ksi) Elongation (%) Hardness (HRC)
H900 190-210 170-200 10 40-47
H1025 155-175 145-165 12 35-42
H1075 145-165 125-145 13 32-39
H1100 135-155 105-125 14 31-37
H1150 125-145 75-100 16 28-34

The 17-4 PH Investment Casting Process: A Detailed Overview

Investment casting, also known as lost-wax casting, is a process that has been utilized for thousands of years. It involves creating a detailed wax model of the desired part, encasing it in a ceramic shell, and then melting the wax out to create a hollow cavity. Molten metal is then poured into the cavity, and once solidified, the ceramic shell is removed, leaving behind a precisely cast component.

  1. 17-4 PH Investment Casting ProcessWax Pattern Creation: A wax model of the desired part is created, either by injection molding or 3D printing. This wax pattern is an exact replica of the final part, including all intricate details and surface finishes.
  2. Assembly: The wax patterns are attached to a central wax gating system, forming a tree-like structure. This allows multiple parts to be cast simultaneously, improving efficiency.
  3. Shell Formation: The wax tree is repeatedly dipped into a ceramic slurry, followed by a refractory coating, to build up a thick shell around the wax patterns. The shell must be strong enough to withstand the high temperatures and pressures during the casting process.
  4. Wax Removal: The ceramic shell is heated to remove the wax, creating a hollow cavity. This step is crucial, as any residual wax can cause defects in the final casting.
  5. Casting: Molten 17-4 PH stainless steel is poured into the pre-heated ceramic shell. The alloy fills the cavity, taking on the shape of the wax pattern.
  6. Shell Removal: Once the metal has solidified, the ceramic shell is removed, typically by mechanical means or high-pressure water blasting.
  7. Post-Casting Operations: The individual parts are cut from the gating system and undergo various post-casting processes, such as heat treatment, surface finishing, and quality inspection.

Advantages of 17-4 PH Investment Casting

  • Design Flexibility: Investment casting allows for the production of complex and intricate parts, providing engineers with greater design freedom.
  • High Precision: The process yields high dimensional accuracy and excellent surface finishes, reducing the need for secondary machining operations.
  • Cost-effective: Investment casting is an economically viable option for both small and large production runs, thanks to its efficient use of materials and minimal waste.
  • Superior Material Properties: 17-4 PH stainless steel provides a combination of high strength, hardness, and corrosion resistance, making it ideal for demanding applications.

Applications of 17-4 PH Investment Casting

17-4 PH Investment Cast Part

17-4 PH investment castings are utilized in a wide range of industries, including:

  • Aerospace: Aircraft components, landing gear systems, and structural parts.
  • Chemical Processing: Valves, fittings, and pump components.
  • Oil and Gas: Subsea equipment, drilling tools, and flow control devices.
  • Medical: Surgical instruments, orthopedic implants, and dental prosthetics.
  • Automotive: High-performance engine components, transmission parts, and exhaust systems.

Tips for Successful 17-4 PH Investment Casting

To ensure the highest quality and performance of 17-4 PH investment cast parts, consider the following best practices:

  1. Collaborate with Expert Foundries: Work with experienced foundries that specialize in 17-4 PH stainless steel and investment casting. Their expertise can help identify potential design challenges and optimize the manufacturing process.
  2. Use Advanced Simulation Tools: Utilize computer-aided design (CAD) and casting simulation software to optimize the gating system, reduce defects, and improve yield.
  3. Quality Control: Implement strict quality control measures at every stage of the process, from wax pattern creation to final inspection, to ensure consistent results and minimize defects.
  4. Post-Casting Treatments: Heat treatment, such as solution annealing and aging, can further enhance the mechanical properties of 17-4 PH stainless steel, providing increased strength and durability.
  5. Material Selection: Ensure that the 17-4 PH stainless steel used for casting meets industry standards and specifications. High-quality raw materials contribute to the superior performance of the final product.

Contact CFS Foundry for 17-4 Investment Casting Services

CFS Foundry is a leading investment casting manufacturer, we specialize in investment casting services of various stainless steel alloys including 17-4 ph alloy. With years of experience and state-of-the-art facilities, we produce and deliver high-quality, precision-engineered components to customers across various industries, including aerospace, automotive, medical,  oil & gas, and more.

Key features of our 17-4 investment casting services include:

  • Experienced team: CFS Foundry employs a team of skilled engineers, metallurgists, and technicians who are well-versed in the intricacies of 17-4 investment casting.
  • Advanced technologies: Utilizing the latest casting technologies, such as computer-aided design (CAD) and casting simulation software, CFS Foundry can optimize the casting process and minimize defects.
  • Strict quality control: CFS Foundry implements rigorous quality control measures at every stage of the investment casting process, ensuring that the final product meets our clients’ exact specifications.
  • Flexible production: With the ability to accommodate both small and large production runs, CFS Foundry can cater to a wide range of project requirements.

If you are looking for a quality manufacturer on 17-4 ph investment casting, pls feel free to contact our foundry!


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