Stainless Steel Flanges

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Chemical Composition of SS Buttweld Fittings

Grade Si P C Mn S Cr Ni
SS 304 0.75 max 0.045 max 0.08 max 2 max 0.030 max 18 – 20 8 – 11
Grade Si P C Mn S Cr Ni
SS 304L 1.0 max 0.045 max 0.035 max 2.0 max 0.03 max 18 – 20 8 – 13
Grade Mn Si C P Ni S Cr Mo N
SS 304H 2.0 max 0.75 max 0.10 max 0.045 max 8 – 10.5 0.03 max 18 – 20 – –
Grade C Mn S Cr Si P Mo Fe Ni
SS 310 0.015 max 2.0 max 0.015 max 24.00 – 26.00 0.15 max 0.020 max 0.10 max 54.7 min 19.00 – 21.00
SS 310S 0.08 max 2.0 max 0.030 max 24.00 – 26.00 1.00 max 0.045 max 0.75 max 53.095 min 19.00 – 21.00
Grade Si P S C Ni N Mn Cr Mo
SS 310H 1.00 max 0.045 max 0.030 max 0.04 – 0.10 19.00 – 21.00 53.885 min 2.0 max 24.00 – 26.00 –
Grade C Mn Si Cr Mo P S Ni Fe
SS 316 0.08 max 2.0 max 1.0 max 16.00 – 18.00 2.00 – 3.00 0.045 max 0.030 max 11.00 – 14.00 67.845 min
SS 316L 0.035 max 2.0 max 1.0 max 16.00 – 18.00 2.00 – 3.00 0.045 max 0.030 max 10.00 – 14.00 68.89 min
Grade C Mn Si Mo Ni P S Cr Fe
SS 316Ti 0.08 max 2.0 max 0.75 max 2.00 – 3.00 10.00 – 14.00 0.045 max 0.030 max 16.00 – 18.00 68.395 min
Grade C Mn Si Cr Mo P S Ni Fe
SS 317 0.08 max 2.0 max 1.0 max 18.00 – 20.00 3.00 – 4.00 0.045 max 0.030 max 11.00 – 15.00 57.845 min
Grade C Mn S Cr Si P Mo Ni Fe
SS 317L 0.035 max 2.0 max 0.030 max 18.00 – 20.00 1.0 max 0.045 max 3.00 – 4.00 11.00 – 15.00 57.89 min
Grade C Mn Si P N Ni S Cr Ti
SS 321 0.08 max 2.0 max 1.0 max 0.045 max 0.10 max 9.00 – 12.00 0.030 max 17.00 – 19.00 5(C+N) – 0.70 max
SS 321H 0.04 – 0.10 2.0 max 1.0 max 0.045 max 0.10 max 9.00 – 12.00 0.030 max 17.00 – 19.00 4(C+N) – 0.70 max
Grade C Mn S Cr Si P Cb Fe Ni
SS 347 0.08 max 2.0 max 0.030 max 17.00 – 20.00 1.0 max 0.045 max 10xC – 1.10 62.74 min 9.00 – 13.00
SS 347H 0.04 – 0.10 2.0 max 0.030 max 17.00 – 19.00 1.0 max 0.045 max 8xC – 1.10 63.72 min 9.0 -13.0
Grade C Mn S Cr Si P Cb Fe Ni
SS 347 0.08 max 2.0 max 0.030 max 17.00 – 20.00 1.0 max 0.045 max 10xC – 1.10 62.74 min 9.00 – 13.00
SS 347H 0.04 – 0.10 2.0 max 0.030 max 17.00 – 19.00 1.0 max 0.045 max 8xC – 1.10 63.72 min 9.0 -13.0
Grade C P S Mn Si Cr Mo Ni N
SS 410 0.15 max 0.040 max 0.030 max 1.0 max 1.0 max 11.5 – 13.5 – 0.50 max –
Grade C Mn S Cr Mo Si P Ni N Fe
SS 446 0.2 max 1.5 max 0.030 max 23 – 30 – 0.75 max 0.04 max 0.50 max 0.10 – 0.25 Balance
Grade C Mn Si P Mo S Cr Ni Cu
SS 904L 0.020 max 2.00 max 1.00 max 0.040 max 4.00 – 5.00 max 0.030 max 19.00 – 23.00 23.00 – 28.00 1.00 – 2.00
Mechanical Properties of SS Butt weld Pipe Fittings

Grade Density Tensile Strength Melting Point Yield Strength (0.2%Offset) Elongation
304 8.0 g/cm3 Psi – 75000 , MPa – 515 1400 °C (2550 °F) Psi – 30000 , MPa – 205 35 %
Grade Melting Point Density Tensile Strength Yield Strength (0.2%Offset) Elongation
304L 1400 °C (2550 °F) 8.0 g/cm3 Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
Grade Density Tensile Strength Melting Point Yield Strength (0.2%Offset) Elongation
304h 8.0 g/cm3 Psi – 75000 , MPa – 515 1400 °C (2550 °F) Psi – 30000 , MPa – 205 35 %
Grade Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
310/310s 7.9 g/cm3 1402 °C (2555 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 40 %
Grade Density Tensile Strength Melting Point Yield Strength (0.2%Offset) Elongation
310h 7.9 g/cm3 Psi – 75000 , MPa – 515 1402 °C (2555 °F) Psi – 30000 , MPa – 205 40 %
Grade Melting Point Density Tensile Strength Yield Strength (0.2%Offset) Elongation
SS 316 1400 °C (2550 °F) 8.0 g/cm3 Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
SS 316L 1399 °C (2550 °F) 8.0 g/cm3 Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %
Grade Density Tensile Strength Melting Point Yield Strength (0.2%Offset) Elongation
316Ti 8.0 g/cm3 Psi – 75000 , MPa – 515 1399 °C (2550 °F) Psi – 30000 , MPa – 205 35 %
Grade Density Tensile Strength Melting Point Yield Strength (0.2%Offset) Elongation
317 7.9 g/cm3 Psi – 75000 , MPa – 515 1400 °C (2550 °F) Psi – 30000 , MPa – 205 35 %
Grade Density Tensile Strength Melting Point Yield Strength (0.2%Offset) Elongation
317L 7.9 g/cm3 Psi – 75000 , MPa – 515 1400 °C (2550 °F) Psi – 30000 , MPa – 205 35 %
Grade Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
321/321h 8.0 g/cm3 1457 °C (2650 °F) Psi – 30000 , MPa – 205 Psi – 75000 , MPa – 515 35 %
Grade Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
347/347h 8.0 g/cm3 1454 °C (2650 °F) Psi – 30000 , MPa – 205 Psi – 75000 , MPa – 515 35 %
Grade Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
347/347h 8.0 g/cm3 1454 °C (2650 °F) Psi – 30000 , MPa – 205 Psi – 75000 , MPa – 515 35 %
Grade Tensile Strength ksi (MPa) min Elongation (% in 50mm) min Yield Strength 0.2% offset ksi (MPa) min Hardness (Brinell) MAX Hardness (Rockwell B) MAX
410 65 (450) 20 30 (205) 217 96
Grade Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
446 7.5 g/cm3 1510 °C (2750 °F) Psi – 40,000 , MPa – 275 Psi – 75,000 , MPa – 485 20 %
Grade Density Melting Point Yield Strength (0.2%Offset) Tensile Strength Elongation
904L 7.95 g/cm3 1350 °C (2460 °F) Psi – 32000 , MPa – 220 Psi – 71000 , MPa – 490 35 %

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