Mito Metals Corporation
DUPLEX
STEEL
SEAMLESS
Pipes
二相ステンレス鋼シームレスパイプ
Duplex and super duplex stainless steel seamless pipes — dual-phase austenite-ferrite microstructure for exceptional strength and chloride resistance.
0
Max NPS"
0
Duplex Grades
0
Min PREN
OD: 609.6mm
WT: 59.54mm
PREN ≥ 40
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Overview
DUAL-PHASE
AUSTENITE-FERRITE
Microstructure
AUSTENITE-FERRITE
Microstructure
50/50 austenite-ferrite dual-phase microstructure delivers twice the yield strength of standard austenitic grades with superior chloride stress corrosion cracking resistance.
01
Dual Phase
50/50 austenite-ferrite structure — twice the yield of 316L at equivalent wall thickness.
02
Chloride Resistant
PREN ≥ 34 (duplex) to ≥ 40 (super duplex) — immune to chloride SCC.
03
1/2" to 24" NPS
Full range per ASTM A790 & A789 with all standard schedules.
04
Full Certification
EN 10204 3.1/3.2, NORSOK MDS, NACE MR0175 with ferrite testing.
Diameter Range
FROM 1/2" TO 24" NPS
½"
DN15¾"
DN201"
DN252"
DN504"
DN1006"
DN1508"
DN20010"
DN25012"
DN30016"
DN40020"
DN50024"
DN600Wall Thickness
AVAILABLE SCHEDULES
5S
Light
5S
Min Wall
10S
Light
10S
Light Wall
SCH 10
Standard
SCH 10
Standard
SCH 40
Standard
SCH 40
Standard
40S
Standard
40S
SS Std
STD
Standard
STD
Default
SCH 80
Extra Strong
SCH 80
XS Wall
80S
Extra Strong
80S
SS XS
XS
Extra Strong
XS
Extra
SCH 160
Extra Heavy
SCH 160
Heavy
XXS
Dbl Extra
XXS
Max Wall
Material Grades
DUPLEX & SUPER DUPLEX
Grades
Grades
2205
UNS S31803 / S32205
STANDARD DUPLEX
Cr22–23%
Ni4.5–6.5%
Mo3.0–3.5%
PREN≥ 34
Yield65 ksi min
2507
UNS S32750
SUPER DUPLEX
Cr24–26%
Ni6–8%
Mo3–5%
PREN≥ 40
Yield80 ksi min
2304
UNS S32304
LEAN DUPLEX
Cr21.5–24.5%
Ni3–5.5%
PREN≥ 25
Yield58 ksi min
2760
UNS S32760
SUPER DUPLEX
Cr24–26%
W0.5–1.0%
PREN≥ 40
Yield80 ksi min
Dimensional Data
PIPE SPECIFICATIONS
ASTM A790 / A789 — Wall Thickness in mm
| NPS | DN | OD MM | 5S | 10S | SCH 40S | SCH 80S | SCH 160 |
|---|---|---|---|---|---|---|---|
| 1/2" | 15 | 21.3 | 1.65 | 2.11 | 2.77 | 3.73 | — |
| 3/4" | 20 | 26.7 | 1.65 | 2.11 | 2.87 | 3.91 | — |
| 1" | 25 | 33.4 | 1.65 | 2.77 | 3.38 | 4.55 | — |
| 2" | 50 | 60.3 | 1.65 | 2.77 | 3.91 | 5.54 | — |
| 4" | 100 | 114.3 | 2.11 | 3.05 | 6.02 | 8.56 | 13.49 |
| 6" | 150 | 168.3 | 2.77 | 3.40 | 7.11 | 10.97 | 18.26 |
| 8" | 200 | 219.1 | 2.77 | 3.76 | 8.18 | 12.70 | 23.01 |
| 10" | 250 | 273.1 | 3.40 | 4.19 | 9.27 | 15.09 | 28.58 |
| 12" | 300 | 323.9 | 3.96 | 4.57 | 10.31 | 17.48 | 33.32 |
| 16" | 400 | 406.4 | 4.19 | 4.78 | 12.70 | 21.44 | 40.49 |
| 20" | 500 | 508.0 | 4.78 | 5.54 | 15.09 | 26.19 | 50.01 |
| 24" | 600 | 609.6 | 5.54 | 6.35 | 17.48 | 30.96 | 59.54 |
Delivery
END FINISH & SURFACE
End Finish
Plain End — Square CutStandard
Beveled End — 30° ± 5°Weld prep
Threaded — NPT / BSPConnection
Testing
HydrostaticA790
Ferrite Count30–70%
UT 100%Volumetric
Surface
PickledA380
Bright AnnealedBA
Solution Annealed1040°C+
Compliance
NORSOK MDS D45/D56North Sea approved
NACE MR0175 / ISO 15156Sour service
AD2000 Merkblatt W2Pressure equipment