What is 17-4 PH stainless steel? 17-4 PH stainless steel (SAE type 630 stainless steel) is a kind of precipitation hardening martensitic stainless steel. It is the most used stainless steel casting alloy of all precipitation hardening stainless steel. 17-4 PH stainless steel casting is the martensitic precipitation-hardened stainless steel casting grade.

The name is from its chemical makeup which is approximately 17% chromium and 4% nickel. The rest elements consist of copper, niobium, columbium, low carbon content.


The Typical usage of 17 4 PH stainless steel castings is for high strength and a modest level of corrosion resistance application. The Strength and toughness desired can be manipulated by the heat treatment process.


It is not an official material grade. It has different standards in different countries.

  • Cast UNS J92180. ASTM A747 Grade CB7CU-1
  • European standard EN10088-3: W Nr 1.4542; X5CrNiCuNb16-4
  • Japan: JIS G4303. SUS630
  • USA: AISI 630. ASTM A564/A693/A705-Type630. AMS5604. AMS 5622.AMS 5643. AS7474A564/SA693/SA705-Type630.UNss17400
  • China: 0Cr17Ni4Cu4Nb. 05Cr17Ni4Cu4Nb

It is similar to 18-8 stainless steel, with a simple heat treatment process and good machinability.
Our Stainless steel quality standards including UNS S17400, AMS 5643, ASTM A564, and ASTM A693 Grade 630.

17-4 ph Stainless Steel Chemical Composition as below:

C MnSi P S CrNi Cu Nb
≤0.07 ≤1.00 ≤1.00 ≤0.040 ≤0.030 15.0-17.5 3.00-5.003.00-5.00 0.15-0.45

17 4 ph stainless steel properties

  • High strength.
  • High hardness.
  • Excellent fatigue properties.
  • Good welding performance
  • Excellent corrosion resistance performance.
  • Good castability, minimum distortion upon heat treatment.
  • In high-heat treated conditions, excellent mechanical properties.

17-4 PH Stainless Steel Casting


JC Casting is an investment casting foundry and manufacturer for 17-4 PH Stainless Steel Casting. There are 2 main Casting Methods in our factory.

  • Investment Casting(Lost Wax Casting, Precision Casting)
  • Sand Casting

Process of 17-4 Stainless Steel Casting

The investment casting process has been used in stainless steel castings for a long history. The casting technic can create 17-4 ph stainless steel castings in accurate dimensions and a good surface finish.

The 17-4 ph stainless steel castings process is as below:

  • 1–Making a mold according to 3d file.
  • 2–Filling the mold with wax .To get a wax patterns
  • 3–Inspect and modify the patterns if there is any defect.
  • 4–Weld the wax patterns to form a assembly tree.
  • 5–Build a shell by Dipping the wax into ceramic slurry
  • 6–Heating the ceramic shell to remove the wax.
  • 7–Pouring the molten metal liquid into the shell.
  • 8–Breaking off the shell, and shot blasting or operate other surface finishing.

For more details, you can view the investment casting process.

17-4 PH Stainless Steel Casting has better corrosive attacks capability than any hardenable stainless steel castings. It is widely used in the chemical, petroleum, paper, dairy, and food processing industries. It is comparable to 304,304L grade Alloy in most media.

17-4 PH stainless steel casting Heat Treatment

The 17-4 PH stainless steel casting can be hardened further by aging at temperatures ranging between 480-620 degrees Centigrade. This process can combination of the alloy’s superior properties. And increases product structure reliability. To make fabrication simple and cost-effective.

Applications of 17-4 PH Stainless Steel Castings

17-4 PH Stainless Steel Castings have been widely used for a variety of applications. Including

  • Oil field valve parts
  • Chemical process equipment
  • Fasteners
  • Pump shafts
  • Nuclear reactor components
  • Gears
  • Missile fittings
  • Valves, shafts
  • Chemical fiber industries
  • High-strength parts with certain corrosion resistance requirements.
  • Intricate parts requiring machining and welding.
  • aircraft fittings, Aerospace-structural, and parts
  • Oil path, mechanical seals, and Components
  • Propeller shafts, pins, and valve spindles
  • Food Process Equipment
  • Nuclear Waste Processing and Storage
  • Pulp and Paper- paper mill equipment

For example, in Oil & Gas field Industry

Oil and gas working is usually operated at great depths, below sea level. Such depths are with high pressure. The high strength of 17-4 PH stainless steel castings shows its High strength and hardness for piping systems at such depths. The 17 4ph stainless steel casting has good resistance to corrosion both on and offshore. Especially for the media like hydrogen sulfide gas, carbon dioxide, and low pH levels in oil prospecting conditions. These features make it the perfect choice for the oil & gas industry.

For Food Processing Equipment

In the food & beverage industry, most of the equipment is made from stainless steel. Stainless Steel 17-4ph castings have a good surface condition and a great finish. That makes it an ideal choice for Food Processing Equipment. The smooth surface and high chromium content make it less prone to corrosion and easy to clean. After all, hygiene is an important integral element of food and beverage manufacture.

17-4 PH stainless steel casting manufacturer and supplier

JC Stainless Steel Foundry is very skilled In customized 17-4 ph stainless steel investment castings. As one of the top leading stainless steel casting manufacturers in China, JC casting can customize 17-4 ph stainless steel castings in different sizes and shapes. Besides, we can also provide extra machining and surface treatment services as per our client’s idea.

Besides the 17 4 ph ss materials, We can help our customers to custom any type of stainless steel casting. Our advanced casting process can produce different castings in small to medium types.

Any inquiry on 17-4 ph stainless steel casting or stainless steel foundry in China, please do not hesitate to contact us or email us at [email protected]

Related Products: