Properties Chart

Brief Comparison between Austenitic, Martensitic & Ferritic Stainless Steels
Duplex is a fourth type of stainless, it is generally identified as a combination Austenitic-Ferritic alloy.

Austenitic Ferritic Martensitic
Non-Magnetic
(May become slightly magnetic after cold working).
Magnetic Magnetic
Generally do not harden with
heat treating.
Generally do not harden with
heat treating.
Hardenable by quenching
and tempering.
Always contains Nickel - around 4-22%, increased or decreased simultaneously with the chromium content as it is varied. Do not have the weldability of the Austenitic grades, but produce very good results due to their lower carbon content. Highly resistant to weak acids and bases while possessing only a moderate chromium content. Generally have a lower nickel content and a higher carbon content.
Of the 3 types, this class of stainless is generally the most suitable for welding and fabricating - also a superior absorber of laser light. Good subject for laser welding as the low heat input of the laser in the HAZ (Heat Affected Zone) reduces grain coarsening. Have the poorest quality of welds due to brittleness and cracking in the HAZ (Heat Affected Zone) because of the high carbon content. Not the best candidate for autogenous welding, more success with filler material.
Make up the 300 grades of stainless. (Also 200) Includes 400 grades such as: 409, T409AL, 434, 436, 439, 441, 442, 444 & 446 Includes 400 grades such as: 403, 410, 414,416, 420, 440
& 431
Chromium content approx.
16-26%
Chromium content approx.
11-28%
Chromium content approx.
12-18%