STAINLESS STEELS

Stainless steel is an iron that resists rusting in most ambient atmosphere. Because of its corrosion-resistance it is widely used in construction, transportation, medical and food industries. The elemental composition of stainless steels can impact it characteristics.  For example, chromium (Cr) adds more corrosion, oxidation, and heat resistance, nickel (Ni) increases temperature resistance, and molybdenum (Mo) enhances strength, hardenability, weldability, toughness, elevated temperature strength, and corrosion resistance.

ACCURATE IDENTIFICATION OF STAINLESS STEEL ALLOYS USING HANDHELD LIBS

The Rigaku KT-100S analyzer utilizes laser induced breakdown spectroscopy (LIBS) and was built to be used in all areas of the metals' lifecycle.  

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304 SS vs. 316 SS

 

321 SS vs. 347 SS

 

304 vs. 17-PH

QUICK GUIDE TO STAINLESS STEEL ALLOYS

Cr-Ni Stainless Steels

Characteristics: resists rusting. Cr add corrosion, oxidation, heat resistant. Ni adds temp resistance, Mo enhances strength, hardenability, weldability, toughness, elevated temperature strength and corrosion resistance

Use: many including kitchen appliances

Chemistry: Fe=60-70%, Cr=18%, Mn 0-2%, Ni 8-15%, Mo=0-3%

Examples: SS-304, SS-316

 

Cr Stainless Steel

Characteristics: when temp resistance is not needed

Use: gas turbines, hardware, motor shaft

Chemistry: Fe=80%, Cr=10-25%, Ni=2.5%max

Examples: SS-410, SS-420

 

Duplex Stainless Steel

Characteristics: magnetic, high tensile strength, stronger than 3XX series

Use: marine apps, offshore rigs

Chemistry: Fe=50-60%, Cr=21-26%, Ni=3.5-8%, Mo=4.5% max

Examples: SS-2205, SS-2304

 

Cobalt Stainless Steel

Characteristics: thermal expansion, high strength, hardened

Use: specialty apps, seals

Chemistry: Fe=50%, Ni=30%, Co=15%

Examples: Kovar

 

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