316 VS 17-4 PH Stainless Steel Casting

Stainless steel 304, 316, and 17-4 PH are 3 types of stainless steel grades for investment casting. They are also commonly used in our foundry. By American standards, 304,316 is a typical austenite stainless steel casting grade. 17-4 PH stainless steel is precipitation hardening material grade. We have made a competence for 304 and 316.you can view the article on 304 VS 316 stainless steel. Today, let’s compare the difference between Stainless Steel 316 and 17-4 ph castings.

Both 17-4 ph and 316 stainless steel castings offer high corrosion resistance. But 17-4 PH has the higher hardening content. Precipitation hardening grade is actually a combination of two stainless steel structures. such as austenite and martensite.

JC Foundry is a professional stainless steel casting company. Both 17-4 PH and 316 stainless steel castings are typical supplies. Due to the differences in chemical compositions and mechanical properties, these two types of stainless steel castings are used in different applications.


To check the differences between 17-4 PH and 316 stainless steel castings. We tested these two kinds of stainless steel casting samples in the chemical and mechanical lab on different testing equipment. The chemical compositions of 17-4 PH stainless steel casting and 316 stainless steel casting are carried out to identify the chemical composition whereas the mechanical tests are performed to know the strength of 316 vs PH 17-4 samples.

After carefully testing and comparison, it can be clearly checked that the chemical composition for the two grades is a bit different in terms of molybdenum, copper, columbium, and Tantalum, etc. The summary of results is shared below:

GRADES >>SS31617-4PH
Copper, columbium, and TantalumN/A4


The mechanical properties of 17-4PH stainless steel casting are higher in terms of hardness, tensile strength, and yield strength as compared to the sample of SS316 stainless steel casting. Here is the summary of results for mechanical properties below:

GRADES >>SS31617-4PH
Tensile Strength Mpa5451276
Yield Strength Mpa2751170
Hardness (HB)220350
Elongation %50%8%


Stainless steel is stainless steel, right? The type of pressure sensor material is critical when measuring liquids and gases. 17-4 PH Stainless Steel is used in a variety of non-corrosive or slightly corrosive liquids and gases. Hydraulic oils, brake fluids, and other standard industrial fluids are ideal for 17-4 PH stainless steel. 316L stainless steel has a high nickel content and is suitable for use with many of the more corrosive liquids and gases. For example, natural gas containing low H2S requires 316L to resist corrosion.

Our Quality controlling.

Before each casting, either 304.316 or PH 17-4 stainless steel casting, stainless steel casting manufacturers should test the chemical compositions. If all elements content is available, the pouring can be done. we have our own spectrometer testing room. The elements testing will be made before each pouring. Before delivering, we also test the mechanical properties to check the quality is within the required range or not. Only qualified stainless steel castings can be sent to customers. At the same time. The related testing reports will be enclosed together.


Now, our foundry just purchased the high automatic machine and in producing. Better precision castings will be provided for you. If you have any inquiries about investment castings. not only 304, 316, 17-4.but also other materials, such as alloy casting, carbon steel casting. welcome, contact us freely. We will reply to you within 12 hours. Now you can email us

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