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Identification Tests for Stainless Steels

Magnetic, spark, hardness and acid identification tests of austenitic, martensitic and ferritic stainless steels

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Stainless steels can be hard to identify. The different types can be distinguished by methods as

  • magnet testing
  • spark testing
  • hardness testing
  • acid testing

For full table with Sulfuric and Hydrochloric Acid Test - rotate the screen!

AISI TypeGradeGroupMagnet TestSpark TestHardness TestSulfuric Acid TestHydrochloric Acid Test
302 Chromium-
Nickel
Austenitic Non-
Magnetic
Few forks - short, reddish >165 Brinell after heated to 1800oF and water quench Strong attack - green crystals and dark surface Rapid reaction - pale blue-green solution
303 Spoiled egg odor - heavy black smudge
303Se Garlic odor
304 Strong attack - green crystals and dark surface Fast attack - gas formation
308 Full red without many forks
309
310
316 Few forks - short, reddish Slow attack - tan surface turns brown Very slow attack
317
321 Fast attack - gas formation
347
410 Chromium Martensitic Magnetic Long white with few forks > 280 Brinell after heated to 1800oF and water quench Rapid reaction - dark green solution
414
416 Spoiled egg odor - heavy black smudge
416Se Garlic odor
420 Long white-red with burst
431 Long white with few forks
440 A, B, C Long white-red with burst
430 Ferritic Long white with few forks 180 - 250 Brinell after heated to 1800oF and water quench
430F Spoiled egg odor - heavy black smudge
430FSe Garlic odor
446 Full red without many forks
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  • en: stailess steels identification
  • es: identificación aceros stailess
  • de: stailess Stähle Identifikations
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