Page 48 - Design Criteria.qxd

49 ® Welcome to the Next Generation of Sealing Technology
Trade Temperature Hardness
Material Name Description Range Value (Brinell) Comments
Carbon - Commercial Quality -50 to 540°C 120 max For General applications only.
Steel Sheet Forged or Rolled Steel Often referred (-58 to 1000°F) -
to as Soft Iron or Armco 90 max for solid
metal gaskets
316 - An 18-12 Chromium/Nickel Austenitic 815°C max 160 max Excellent corrosion resistance
Stainless Steel, containing approx. (1500°F) Subject to stress corrosion
2% molybdenum content for high cracking and intergranular
temperature strength. corrosion in the presence of
certain media
Carbide precipitation may occur
above 540°C
316L - Variation of 316, carbon content reduced to 815°C max 160 max Reduced possibilities of stress
0.03% maximum (1500°F) Corrosion cracking and
intergranular corrosion due to
reduced carbon content
304 - An 18-8 chromium/nickel austenitic 540°C max 160 max Excellent corrosion resistance
stainless steel (1000°F) Subject to stress corrosion
cracking and intergranular
corrosion at elevated
temperatures
304L - Variation of 304. Carbon content reduced to 540°C max 160 max Reduced possibilities of stress.
0.03% maximum 1000°F Corrosion cracking and
intergranular corrosion due to
reduced carbon content
317L - An 18-13 chromium/nickel 3% molybdenum 815°C max 160 max Reduced possibilities of stress
austenitic stainless steel *1500°F) Corrosion cracking and
intergranular corrosion due to
reduced carbon content
321 - An 18-10 chromium/nickel austenitic stainless 870°C max 160 max Is subject to stress corrosion
steel with a titanium addition (1600°F) Reduced possibilities of
intergranular corrosion
347 - An 18-10 chromium/nickel austenitic stainless 870°C max 160 max Similar properties as 321. High
steel with the addition of columbium (niobium) (1600°F) temperature resistance
410 - A 13% chrom, 0.15% carbon martensitic 850°C max 170 max Excellent high temperature
stainless alloy (1560°F) strength/corrosion properties.
Excellent resistance to oxidation,
nitriding and carborization
Titanium Titanium High Purity Titanium material 1095°C max Approx 215 Excellent high temperature
(2000°F) Corrosion resistance
Outstanding in oxidizing medias
Alloy 600 Inconel A 70% nickel, 15% chronium, 1095°C max 150 max Excellent high temperature
600® 8% Iron alloy steel (2000°F) strength/corrosion properties
Excellent resistance to oxidation
Nitriding and carborization
Alloy 625 Inconel A nickel/chromium alloy with substantial 1095°C max 200 max Outstanding corrosion resistance
625® additions of molybdenum & columbium (niobium) (2000°F) in a wide range of acid, neutral
and alkaline environments
Alloy 800 Incoloy A 32% nickel, 20% chromium, 1095°C max 200 max Excellent high temperature
800® 46% iron alloy steel (2000°F) resistance
Alloy 825 Incoloy A nickel, chromium, iron, molybdenum and 1095°C max 150 max High resistance to hot acid
825® copper alloy steel (2000°F) conditions and outstanding
resistance to stress corrosion
cracking.
Metallic Gasket Materials