Stainless Steel Standard and Grades

INOX will offer Ferritic stainless steel grades, austenitic stainless steel grades and duplex stainless steel grades. Composition is a fundamental characteristic of stainless steel because it determines the alloy's corrosion resistance, microstructural phase balance, mechanical properties, and physical properties. The table below lists the most important stainless steel grades and the most important molybdenum-containing grades. The most widely used grades are austenitic Types 304 and 316 and ferritic Types 409 and 430.
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Stainless Steel Standard and Grades

EN AISI UNS Cr Mo Ni N PREN
Ferritic grades
1.4512 409 S40900 11.5       11.5
1.4016 430 S43000 16.5       16.5
1.4113 434 S43400 16.5 1     19.8
1.4526 436 S43600 17.5 1.25     21.6
1.4521 444 S44400 17.7 2.1     24.6
    S44600 27 3.7 2   39.2
Austenitic Stainless Steel grades
1.4301 304 S30400 18.1   8.3   18.1
1.4401 316 S31600 17.2 2.1 10.2   24.1
1.4438 317L S31703 18.2 3.1 13.7   28.4
1.4439 317LMN S31726 17.8 4.1 12.7 0.14 33.6
1.4539 904L N08904 20 4.3 25   34.2
  (6%Mo)   20 6.1 18-24 0.2 43.3
Duplex Stainless Steel grades
1.4362 2304 S32304 23 0.3 4.8 0.1 25.6
1.4462 2205 S32205 22 3.1 5.7 0.17 35.0
1.4410 2507 S32750 25 4 7 0.27 42.5
The Pitting Resistance Equivalent Number (PREN) is a measure of the relative pitting corrosion resistance of stainless steel in a chloride-containing environment. Higher PREN values indicate greater corrosion resistance.