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Difference Between Duplex and Super Duplex Material

Difference Between Duplex and Super Duplex Material


Table Of Content

Duplex and Super Duplex Stainless Steel Grades

UNS
 Common name or type EN Number Cr Mo Ni Cu MnA CA NA Other PREN
First-generation duplex stainless steels
S31500 1.4424 18.5 2.7 4.9 - 1.2-2.0 0.03 0.05-0.10 1.7Si 27
S32404 21 2.2 6 1.4 2.0 0.04 - - 28
S32900 329C 1.4480 26 1.5 4.5 - 1.0 0.08 - - 31
Second-generation duplex stainless steels
“Lean” duplex
S32001 1.4482 20 0.6 1.6 - 4.0-6.0 0.03 0.05-0.17 - 22
S32101 1.4162 21 0.4 1.5 0.5 4.0-6.0 0.04 0.20-0.25 - 26
S32202 1.4062 22.5 0.4 2.2 - 2.0 0.03 0.18-0.26 - 27
S32304 2304D 1.4362 23 0.3 4.0 0.3 2.5 0.03 0.05-0.20 - 26
S82011 21 0.4 1.5 - 2.0-3.0 0.03 0.15-0.27 - 26
S82012 1.4635 19.5 0.3 1.2 - 2.0-4.0 0.05 0.16-0.26 - 25
S82013 20 - 1 0.8 2.5-3.5 0.06 0.20-0.30 - 24
S82122 21 0.6 2 1 2.0-4.0 0.03 0.15-0.20 - 25
1.4655 22.5 0.3 4.5 2 2.0 0.03 0.05-0.20 - 26
1.4669 22 0.5 2 2.2 1.0-3.0 0.045 0.12-0.20 - 26
Molybdenum-containing “lean” duplex
S32003 21.5 1.8 3.3 - 2.0 0.03 0.14-0.20 - 30
S81921 21 1.5 3 2.0-4.0 0.03 0.14-0.20 - 27
S82031 1.4637 21 1 3 2.5 0.05 0.14-0.24 - 27
S82121 21.5 0.8 3 1.0-2.5 0.035 0.15-0.25 - 27
S82441 1.4662 23.5 1.5 3.5 2.5-4.0 0.03 0.20-0.30 - 33
“Standard” duplex
S31803 2205D 1.4462 21 2.7 5.0 - 2.0 0.03 0.08-0.20 - 31
S32205 2205D 1.4462 22 3 5.0 - 2.0 0.03 0.14-0.20 - 35
S31200 1.4460 25 1.7 6.0 - 2.0 0.03 0.14-0.20 - 32
S32950 26.5 1.5 4.8 - 2.0 0.03 0.15-0.35 - 34
S31260 1.4481 25 3 7 0.5 1.0 0.03 0.10-0.30 0.3W 37
S32808 27 1 7 - 1.1 0.03 0.30-0.40 2.3W 39
“Super” duplex
S32506 25 3 6 - 1.0 0.03 0.08-0.20 0.15W 40
S32520 1.4507 25 4 6.5 1 1.5 0.03 0.20-0.35 - 41
S32550 255D 1.4507 25 3.5 6 2 1.5 0.04 0.10-0.25 - 40
S32750 2507D 1.4410 25 4 7 - 1.2 0.03 0.24-0.32 - 42
S32760 Z100D 1.4501 25 3.5 7 0.7 1.0 0.03 0.20-0.30 0.7W 41
S32906 1.4477 28 2 6 - 0.80-1.5 0.03 0.30-0.40 - 40
S39274 25 3 7 0.5 1.0 0.03 0.24-0.32 1.8W 42
S39277 25 3.5 7 1.5 0.80 0.025 0.23-0.33 1W
“Hyper” duplex
S32707 1.4658 27 4.8 6.5 - 1.5 0.03 0.30-0.50 1.0Co 50
S33207 1.4485 30 3.5 7 - 1.5 0.03 0.40-0.60 - 52
Austenitic stainless steels
S30403 304LC 1.4307 18 - 8 - 2.0 0.03 0.10 - 20
S31603 316LC 1.4404 16 2 11 - 2.0 0.03 0.10 - 24
S31703 317LC 1.4438 18 3 11 - 2.0 0.03 0.10 - 29
N08904 904LD 1.4539 20 4.1 24 1.0 2.0 0.02 - - 34
N08367 20 6 24 - 2.0 0.03 0.18-0.25 - 43
S31254 1.4547 20 6 18 0.8 1.0 0.02 0.18-0.22 - 43

ASTM Designation Is Different For Each Grade, Refer The Below Table To Know The Manufacturing Standard Of Duplex Steel Long Flat Products

Equivalents Of Stainless Steel Duplex And SDSS Material

Equivalents Of Stainless Steel Duplex And SDSS Material
Trade Name DUPLEX DUPLEX 2205 DUPLEX SUPER DUPLEX 2507 FERRALIUM 225 ZERON 100
UNS # S31200 S31803 S32205 S32750 S32550 S32760
Seamless Welded Pipe
(without Filler Metal)		 A/SA790 A/SA790 A/SA790 A/SA790 A/SA790 A/SA790
Welded Pipe
(with Filler Metal)		 A928 A928 A928 A928 A928 A928
Seamless & Welded General Service Tubing
(without Filler Metal)		 A/SA789 A/SA789 A/SA789 A/SA789 A/SA789 A/SA789
Sanitary Tubing - A270 A270 A270 - -
Buttweld Fittings* - A/SA815 A/SA815 A/SA815 A/SA815 A/SA815
Forged Fittings A/SA182
F50		 A/SA182
F51		 A/SA182
F60		 A/SA182
F53		 A/SA182
F61		 A/SA182
F55
Flanges A/SA182
F50		 A/SA182
F51		 A/SA182
F60		 A/SA182
F53		 A/SA182
F61		 A/SA182
F55
Bar - A/SA479
A/SA276		 A/SA479
A/SA276		 A/SA479
A/SA276		 A/SA479
A/SA276		 A/SA479
A/SA276
Plate A/SA240 A/SA240 A/SA240 A/SA240 A/SA240 A/SA240
Forged Valves A/SA182
F50		 A/SA182
F51		 A/SA182
F60		 A/SA182
F53		 A/SA182
F61		 A/SA182
F55

Check Most Suitable Temperature Range For DSS And SDSS Material, Know Their Properties And Melting Range

Mechanical Properties Of DSS And SDSS Material

Mechanical Properties Of DSS And SDSS Material
Grades Melting Point (°F) Melting Point (°C) Density (lb/in 3) Density (g/cm 3)
S31803 / S32205 2588 -2669 1420 -1465 0.285 7.805
S32750 / S32760 2460 1350 0.281 7.8

Tensile Strength of Duplex SS

Grade UNS Yield strength
(0.2% MPa)		 Tensile Strength
(MPa)
2304 S32304 400 (58) 600 (87)
2205 S32205 450 (65) 655 (95)
2507 S32750 550 (80) 795 (116)

As per NASA (Technical Note No. 411) Rapid Chemical Test Can Be Performed To Compare Chromium And Molybdenum Contents In DSS SDSS Material

Composition Of Duplex & Super Duplex Material

Grade Nickel Manganese Silicon Carbon Sulfur Chromium Molybdenum Nitrogen Phosphorus Iron
S 31803 6.50 2 1.00 0 .030 0.020 22 3.0 -3.5 0.14 -0.20 0.030 63.72
S32205 6.50 2 1.00 0 .030 0.020 21 2.5 0.8 -0.20 0.030 63.54
S32750 6.00 - 8.00 1.20 0.80 0.030 0.020 24.00 - 26.00 3.00 - 5.00 0.24 - 0.32 0.035 58.095
S32760 6.00 - 8.00 1.00 1.00 0.05 0.010 24.00 - 26.00 3.00 - 4.00 0.20 - 0.30 0.030 57.61
Stress Corrosion Cracking (SCC) Testing Is Performed To Know The Failure Of Material At High Temperature, Refer Below Table For Duplex Steel SDSS Chloride Limit

Chloride SCC Resistance Testing Of DSS And Super Duplex SS Material In Boiling Salt Solutions

Chloride SCC Resistance Testing Of DSS And Super Duplex SS Material In Boiling Salt Solutions
Alloy 42% MgCl2 26% NaCl 33% LiCl
Austenitic SST
Type 304L (S30403) SCC SCC SCC
Type 316L (S31603) SCC SCC SCC
904L (N08904) SCC No Cracking SCC
6% Mo SST SCC No Cracking SCC
Alloy 20 (N08020) SCC No Cracking No Cracking
Duplex SST
2205 (S32205) SCC No Cracking No Cracking
255 (S32550) SCC No Cracking ---
2507 (32750) SCC No Cracking ---

Application Of Duplex Alloy

  • Chemical process plant
  • Pollution control equipment
  • Oil refining
  • Transport and storage
  • Gas exploration
  • Offshore rigs
  • Marine environments
  • Paper manufacturing

What is Super Duplex Stainless Steel used for

  • Oil & Gas
  • Bolts and Fasteners
  • Pollution control scrubbers
  • Pump Shafts
  • Water Treatment
  • Vegetable Processing
  • Marine Applications
Compare The Pressure Rating Of DSS Super Duplex Steel Accordance To European (EN 13480-3), American (ASME B31.3), German (DIN 2413) Swedish (RN 78) Standard

DSS And SDSS Tubular Pressure Rating For Vessels And Boilers

Grade Maximum internal pressure, bar
20°C 50°C 100°C 150°C 200°C 250°C 300°C 350°C 400°C
1.4547
(254 SMO)		 1579 1421 1254 1138 1045 984 929 905 882
1.4462
(SAF 2205)		 1858 1858 1672 1556 1440 1370 - - -

1.4410
(SAF 2205)

2322 2322 2230 2067 1951 1881 - - -

American Standard ASME B31.3 Pressure Rating

Grades Bar (Max internal pressure)
100 (°F) 200 (°F) 300 (°F) 400 (°F) 500 (°F) 600 (°F) 700 (°F)
S32750
(SAF 2507)		 909 853 817 799 796 796 -
S 31803 705 705 679 653 639 632 -
S31254
(254 SMO)		 632 632 503 465 437 420 408

Pressure Rating As per DIN 2413 German Standard

Grade
Maximum internal pressure, bar
20°C 100°C 150°C 200°C 250°C 300°C 350°C 400°C
1.4462
(SAF 2205)		 1665 1332 1443 1335 1270 - - -
(1.4410)
(SAF 2507)		 1984 1732 1869 1764 1701 - - -

Pressure Rating As per RN 78 Swedish Code

Grade
Maximum internal pressure, bar
20°C 100°C 150°C 200°C 250°C 300°C 350°C 400°C
2377
(SAF 2205)		 1918 1534 1428 1321 1257 - - -
2328
(SAF 2507)		 2344 2046 1897 1790 1726 - - -

Difference Between Duplex and Super Duplex Material

Super Duplex Thermal Expansion Coefficient

Properties UNS S32750 UNS S31803 UNS S32760 UNS S32205
Specific Heat Capacity 480 J/kg-K 480 J/kg-K 480 J/kg-K 480 J/kg-K
Max Temp: Corrosion 450 °C (840 (°F)) 430 °C (810 (°F)) 450 °C (840 (°F)) 440 °C (820 (°F))
Max Temperature: Mechanical 1100 °C (2010 (°F)) 1060 °C (1940 (°F)) 1100 °C (2010 (°F)) 1070 °C (1970 (°F))
Thermal Conductivity 15 W/m-K 16 W/m-K 15 W/m-K 15 W/m-K
Thermal Expansion 12 µm/m-K 13 µm/m-K 13 µm/m-K 13 µm/m-K
Melting Completion 1450 °C (2640°F) 1450 °C (2640°F) 1460 °C (2660°F) 1450 °C (2640°F)
Latent Heat of Fusion 300 J/g 300 J/g 300 J/g 300 J/g
Melting Onset 1400 °C (2560 (°F)) 1400 °C (2560 (°F)) 1410 °C (2570 (°F)) 1400 °C (2560 (°F))

Electrical Propertie Of DSS And SDSS

Values
Electrical Resistance 0,8 µΩm

Difference Between Duplex Alloy Heat Treatment

Supplied by AWI Temperature Cooling
Spring Temper 250 °C (480 °F) Air

HSN Code of DSS And Super Duplex Alloy Material

HS Code Duplex stainless steel Import
HSN Code No of Shipments Description
73041190 65 Other
7222 Bars And Rods
7306 Other Tubes and Pipes
72221119 213 Other
73064000 44 Circular cross-section
72223099 169 Other
7219 Flat-Rolled Products
7304 Hollow Profiles and Seamless
72192112 62 Exceeding 14 mm
HS Code Duplex stainless steel Export
HSN Code No of Shipments Description
72222012 43 Nickel chromium
73072100 43 Flanges
7222 Other Bars And Rods
7307 Tube Or Pipe Fittings
84841090 100 Other
73072900 36 Other
8484 Gaskets
73072300 98 Butt welding fittings

Welding Consumables for Duplex SS

PROCESS AWS CLASSIFICATION
SMAW E2595-15
GTAW ER 2209
GTAW ER2594
SMAW E2209-16
SMAW E2553-16

Duplex Stainless Steel is Magnetic or Not and Characteristics

Duplex Characteristics

  • Restricted to (300 deg. C)
  • More difficult to form
  • Weldable
  • Stress corrosion cracking
  • Wide range (Corrosion Resistance)
  • Twice design strength