Question 1

Is 304 or 316 easier to machine?

Accepted Answer

304 is easier to machine due to lower work-hardening rate and lower cutting forces. 316's higher strength and molybdenum content reduce tool life by approximately 20% under identical machining parameters. Adjust speeds down by 15–20% when switching from 304 to 316.

Question 2

Can stainless steel be heat treated for better machinability?

Accepted Answer

Austenitic stainless (304, 316) cannot be heat treated for hardness changes. However, solution annealing at 1,040°C followed by rapid quenching can soften material that has been cold-worked. Avoid purchasing cold-drawn 304/316 bar for machining-intensive work.

Question 3

What causes built-up edge when machining stainless steel?

Accepted Answer

BUE is common in stainless due to its high ductility and work-hardening. Increase cutting speed to above 250 SFM for 304 and 200 SFM for 316. Use TiAlN-coated tools with polished flutes to reduce material adhesion. Maintain chip load above 0.003 in/tooth to ensure clean shearing.
⚡ Calculated for Carbide-Tooling.com High-Performance Series. View Catalog →

Stainless Steel Properties

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