MITO METALS — ALLOY DIVISION
ALLOY
STEEL
SEAMLESS
PIPES
合金鋼シームレスパイプ
Chrome-moly alloy steel seamless pipes for high-temperature, high-pressure service — power generation, petrochemical, and refinery critical applications.
1/2"–24"NPS
1500°FMax Temp
8Grades
A335ASTM
Explore
Overview
ENGINEERED FOR
EXTREME CONDITIONS
EXTREME CONDITIONS
Hot-extruded from chromium-molybdenum alloy billets — no weld seam — for sustained creep resistance and pressure integrity at elevated service temperatures.
1500°F
Max Service
24"
Max NPS
9.5%
Max Cr
64 ksi
P92 Yield
01
Chrome-Moly Matrix
Cr-Mo alloy system for oxidation resistance and creep strength at elevated temperatures.
02
Zero Weld Seam
Hot-extruded from solid billets — no weld to fail under thermal cycling.
03
Full Size Range
1/2" to 24" NPS per ASTM A335 with all standard wall thicknesses.
04
Full Traceability
EN 10204 3.1/3.2 MTR with heat traceability and NACE MR0175 compliance.
Diameter Range
FROM 1/2" TO 24" NPS
½"
DN15
1"
DN25
2"
DN50
4"
DN100
6"
DN150
8"
DN200
10"
DN250
12"
DN300
16"
DN400
20"
DN500
24"
DN600
Wall Thickness
AVAILABLE SCHEDULES
SCH 20
Standard
SCH 30
Standard
SCH 40
Standard
STD
Standard
SCH 60
Heavy
SCH 80
X-Strong
XS
X-Strong
SCH 100
Heavy
SCH 120
Heavy
SCH 140
Heavy
SCH 160
X-Heavy
XXS
Dbl Extra
Material Grades
CHROME-MOLY
ALLOY GRADES
ALLOY GRADES
P5ASTM A335 P55Cr–0.5Mo
Cr: 4–6%Mo: 0.45–0.65%Temp: 1200°F
P9ASTM A335 P99Cr–1Mo
Cr: 8–10%Mo: 0.90–1.10%Temp: 1200°F
P11ASTM A335 P111.25Cr–0.5Mo
Cr: 1–1.5%Mo: 0.44–0.65%Yield: 30 ksi
P22ASTM A335 P222.25Cr–1Mo
Cr: 1.9–2.6%Mo: 0.87–1.13%Yield: 30 ksi
P91ASTM A335 P919Cr–1Mo–V–Nb
Cr: 8–9.5%Mo: 0.85–1.05%Yield: 60 ksi
P92ASTM A335 P929Cr–1.8W–Mo–V
W: 1.5–2.0%Temp: 1200°F+Yield: 64 ksi
Dimensional Data
PIPE SPECIFICATIONS
ASTM A335 — Wall Thickness in mm
ASTM_A335_DIMENSIONS.DAT
| NPS | DN | OD | SCH 40 | SCH 80 | SCH 120 | SCH 160 | XXS |
|---|---|---|---|---|---|---|---|
| 1/2" | 15 | 21.3 | 2.77 | 3.73 | — | — | 7.47 |
| 1" | 25 | 33.4 | 3.38 | 4.55 | — | — | 9.09 |
| 2" | 50 | 60.3 | 3.91 | 5.54 | — | — | 11.07 |
| 4" | 100 | 114.3 | 6.02 | 8.56 | 11.13 | 13.49 | 17.12 |
| 6" | 150 | 168.3 | 7.11 | 10.97 | 14.27 | 18.26 | 21.95 |
| 8" | 200 | 219.1 | 8.18 | 12.70 | 18.26 | 23.01 | 22.23 |
| 10" | 250 | 273.1 | 9.27 | 15.09 | 21.44 | 28.58 | 25.40 |
| 12" | 300 | 323.9 | 10.31 | 17.48 | 25.40 | 33.32 | 25.40 |
| 16" | 400 | 406.4 | 12.70 | 21.44 | 30.96 | 40.49 | — |
| 20" | 500 | 508.0 | 15.09 | 26.19 | 38.10 | 50.01 | — |
| 24" | 600 | 609.6 | 17.48 | 30.96 | 46.02 | 59.54 | — |
Delivery
END FINISH & COATINGS
End Finish Options
+
Plain EndSquare cut
Beveled End30° ± 5°
ThreadedNPT / BSP
GroovedRoll / cut
Protective Coatings
+
Black VarnishAnti-rust
3LPE / 3LPPPolyethylene
FBEFusion epoxy
Bare / OiledRust preventive
Testing & Inspection
+
HydrostaticASTM A335
Ultrasonic (UT)100% volumetric
RadiographicPer request
PMI VerificationXRF / OES
Heat Treatment
+
NormalizedPer ASTM spec
N + TemperedP91 / P92
AnnealedFull anneal
Stress RelievedPWHT per code