13-8 vs 17-4 stainless steel

Material	13-8 Mo Stainless Steel	17-4 Stainless Steel
Chemical Composition	13% chromium, 8% nickel, 2% molybdenum, 0.10% carbon	17% chromium, 4% nickel, 4% copper, 0.07% carbon
Heat Treatment	Age hardenable	Precipitation hardenable
Strength	High strength, good toughness	High strength, good corrosion resistance
Corrosion Resistance	Moderate	Good
Weldability	Good	Moderate
Machinability	Moderate	Moderate
Applications	Aerospace, nuclear, petrochemical industries	Aerospace, chemical processing, food processing, oil and gas industries

Chemical composition: 
13-8 Mo stainless steel has 8% nickel, 13% chromium, 2% molybdenum, and 0.05% carbon, while 17-4 stainless steel has 4% copper, 17% chromium, 4% nickel, and 0.07% carbon.

Strength and hardness: 
13-8 Mo stainless steel is stronger and harder than 17-4 stainless steel. In its hardened and aged state, 13-8 Mo can have a tensile strength of up to 220 ksi and a Rockwell hardness of up to 45 HRC, while 17-4 can have a tensile strength of up to 190 ksi and a Rockwell hardness of up to 40 HRC.

Corrosion Resistance:
Both 13-8 Mo stainless steel and 17-4 stainless steel are good at resisting corrosion. But 13-8 Mo has better resistance to stress corrosion cracking and pitting corrosion, while 17-4 has better resistance to general corrosion and high-temperature oxidation.

Weldability: 
Compared to 17-4 stainless steel, 13-8 Mo stainless steel is harder to weld. It needs to be heated before and after the weld to keep it from cracking and ensure it has the right mechanical properties.

Applications: 
13-8 Mo stainless steel is often used in high-stress and high-corrosion environments, such as aerospace and petrochemical applications. 17-4 stainless steel is used in various industries, such as aerospace, chemical processing, and medical devices.

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