455 Stainless Steel vs 17-4 – What’s the Difference

455 Stainless Steel vs 17-4

Stainless steel is popular in producing items like kitchen appliances, surgical tools, and automotive parts. However, several types of stainless steel are available, each with unique properties. Two such types are 455 stainless steel and 17-4 stainless steel. In this blog post, we will compare and contrast these two stainless steels so you can decide which type is best for your needs.

Difference Between 455 Stainless Steel vs 17-4

Chemical Composition

455 stainless steel is a martensitic chromium, nickel, and copper alloy. It has relatively high amounts of manganese and silicon, making it a cost-effective alternative to austenitic stainless steels. On the other hand, 17-4 stainless steel is a precipitation-hardening steel made up of 4% copper, 4% nickel, and 17% chromium. It also contains small amounts of aluminium, titanium, and manganese.


455 stainless steel is known for its high strength and corrosion resistance, making it an excellent choice for durable applications. It also has good formability, weldability, and machinability. 17-4 stainless steel is particularly known for its excellent corrosion resistance, especially in harsh environments. It also has high strength and hardness, making it ideal for applications requiring durability and wear and tear resistance.


455 stainless steel is used to produce surgical tools, industrial equipment, and automotive parts. It is also popular in the aerospace industry thanks to its excellent strength-to-weight ratio. 17-4 stainless steel is commonly used to produce pump shafts, valves, and gears. It is also used in the aerospace and defence industries due to its ability to withstand high-stress environments.

Heat Treatment

Both 455 stainless steel and 17-4 stainless steel can be heat-treated to enhance their properties. 455 stainless steel can be tempered and hardened for improved strength and wear resistance, while 17-4 stainless steel can be aged to increase its strength and hardness.


455 stainless steel is generally less expensive than 17-4 stainless steel, making it an attractive option for budget-conscious buyers.


In conclusion, 455 stainless steel and 17-4 stainless steel are excellent choices for applications requiring durability, corrosion resistance, and hardness. Depending on your specific needs, one type of stainless steel may be more suitable. Ultimately, it’s important to consider factors like chemical composition, properties, applications, heat treatment options, and cost before making a final decision.



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