Identification Tests for Stainless Steels

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

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

  • magnet testing
  • spark testing
  • hardness testing
  • acid testing
AISI Type Grade Group Magnet Test Spark Test Hardness Test Sulfuric Acid Test Hydrochloric 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

Related Topics

  • Dimensions - Sizes and dimensions of pipes and tubes, and their fittings - inside and outside diameter, weight and more
  • Corrosion - Corrosion in piping systems - caused by thermodynamic and electrochemical processes - corrosion problems and methods of protection and prevention
  • Material Properties - Material properties - density, heat capacity, viscosity and more - for gases, fluids and solids

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