Delivering High Quality Stainless Steel and Alloy Piping Products — Pipes, Tubes, Fittings, Flanges and more for Global Industries.
sales@savoypipinginc.com
Delivering High Quality Stainless Steel and Alloy Piping Products — Pipes, Tubes, Fittings, Flanges and more for Global Industries.
sales@savoypipinginc.com
| Choose | When | Watch-outs |
|---|---|---|
| A691 91 | EFW alloy route for large OD / project packages | State class + plate spec |
| A335 seamless | Seamless chrome-moly when required | Different product form |
| A691 hub | Sibling Cr grades | Confirm design metal temperature |
ASTM A691 Grade 91 Class ____ OD: ____ Wall: ____ Qty: ____ HT/NDE: ____ MTC: 3.1/3.2 Destination: ____
Email sales@savoypipinginc.com with destination and any IBR / NACE / TPI notes.
Savoy Piping Inc. supplies ASTM A691 Grade 91 / ASME SA691 Grade 91 electric-fusion-welded chrome moly pipe — 9Cr-1Mo-V plate-welded pipe for high-pressure elevated-temperature service in large diameters where seamless chrome moly is impractical.
Typically fabricated from Grade 91 / modified 9Cr pressure-vessel plate families. Buyers usually need more than a grade name: specify class (heat treatment + radiography + pressure test), OD, wall, ends and documentation up front.
Where Grade 91 fits: large-diameter supercritical / advanced steam systems needing CSEF Grade 91 in EFW form. Matching seamless / tube products: ASTM A335 P91 and ASTM A213 T91.
Related grades: 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91. Hub: ASTM A691 grades / ASME SA691.
| ASTM A691 91 Alloy Steel EFW Pipes Specification | ASTM A691 / ASME SA691 |
| ASTM A691 91 Alloy Steel EFW Pipes Grades | ASTM A691 / ASME SA691 Grade 91 |
| ASTM A691 91 Alloy Steel EFW Pipes Type | EFW (Electric Fusion Welded Pipes) |
| ASTM A691 91 Alloy Steel EFW Pipes Class Designation | CLASS 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 40, 41, 42, 43 |
| ASTM A691 91 Alloy Steel EFW Pipes Outer Diameter Size | 16" NB to 100" NB (Nominal Bore Size) |
| ASTM A691 91 Alloy Steel EFW Pipes Wall Thickness | Schedule 20 to Schedule XXS (Heavier On Request) Up to 75 mm Thickness |
| ASTM A691 91 Alloy Steel EFW Pipes Length | 5 to 7 Meters, 09 to 13 Meters, Single Random Length, Double Random Length And Customize Size. |
| ASTM A691 91 Alloy Steel EFW Pipes Ends | Plain Ends / Beveled Ends / Coupling |
| ASTM A691 91 Alloy Steel EFW Pipes Delivery Conditions | As Rolled, Normalizing Rolled, Thermomechanical Rolled / Formed, Normalizing Formed, Normalized and Tempered / Quenched and Tempered - BR / N / Q /T |
| ASTM A691 91 Alloy Steel EFW Pipes Coating | Epoxy Coating / Colour Paint Coating / 3LPE Coating. |
| ASTM A691 91 Alloy Steel EFW Pipes Other Testing | NACE MR0175, NACE TM0177, NACE TM0284, Charpy V-Notch Test, Radiograph HIC Examination, XRAY, Ultrasonic EXAMINATION, Liquid Penetrant, Magnetic Particle, HIC Test, SSC Test, SWC, H2 Service, IBR, PWHT Etc. |
| ASTM A691 91 Alloy Steel EFW Pipes Dimension | All Pipes Is Manufactured and Inspected / Tested to the Relevant standards including ASTM, ASME, API. |
| ASTM A691 91 Alloy Steel EFW Pipes Value Added Services | Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Galavanizing / Heat Treatment |
| ASTM A691 91 Alloy Steel EFW Pipes Packaging | Loose / Bundle / Wooden Pallet / Wooden box-a / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector |
| ASTM A691 91 Alloy Steel EFW Pipes Shipment & Transportation | By Road - Truck / Train, By Sea - Break-bulk Conventional Vessel / FCL (Full Container Load) / LCL (Less Container Load) / 20 Feet Container / 40 Feet Container / High Cube Container / Open Top Container, By Air - Freighter Civil Passenger and Cargo Planes |
| ASTM A691 91 Alloy Steel EFW Pipes Material Test Certificate | Manufacturer Test Certificate As Per EN10204 3.1, 3.2 / Laboratory Test Certificate From NABL Approved Lab. / Under Third Party Inspection Agency Like SGS, TUV, DNV, LLOYDS, ABS ETC |
ASTM A691 / ASME SA691 Grade 91 is electric-fusion-welded alloy steel pipe fabricated from pressure-vessel-quality plate for high-pressure service at elevated temperatures. Chemistry is modified 9Cr-1Mo with vanadium (CSEF plate chemistry aligned to Grade 91 families).
Unlike seamless ASTM A335 P91, A691 Grade 91 is made by forming and fusion-welding plate with filler metal. That makes it a practical route for larger OD and heavy fabrication packages, provided the specified class, NDE and heat treatment are met.
Always order grade + class together, and confirm weld procedure / PWHT requirements for the chrome moly chemistry involved.
Grade 91 is CSEF modified 9Cr — not classic 9CR. Use Grade 91 when creep design demands it; use 9CR for traditional high-chromium process EFW. Pair with seamless P91/T91 only within an approved materials strategy.
| Class | Heat Treatment on Pipe | Radiography, see Section | Pressure Test, see: |
| A691 / SA691 EFW Pipe Class 10 | none | none | none |
| A691 / SA691 EFW Pipe Class 11 | none | 9 | none |
| A691 / SA691 EFW Pipe Class 12 | none | 9 | 8.3 |
| A691 / SA691 EFW Pipe Class 13 | none | none | 8.3 |
| A691 / SA691 EFW Pipe Class 20 | stress relieved, see 5.3.1 | none | none |
| A691 / SA691 EFW Pipe Class 21 | stress relieved, see 5.3.1 | 9 | none |
| A691 / SA691 EFW Pipe Class 22 | stress relieved, see 5.3.1 | 9 | 8.3 |
| A691 / SA691 EFW Pipe Class 23 | stress relieved, see 5.3.1 | none | 8.3 |
| A691 / SA691 EFW Pipe Class 30 | normalized, see 5.3.2 | none | none |
| A691 / SA691 EFW Pipe Class 31 | normalized, see 5.3.2 | 9 | none |
| A691 / SA691 EFW Pipe Class 32 | normalized, see 5.3.2 | 9 | 8.3 |
| A691 / SA691 EFW Pipe Class 33 | normalized, see 5.3.2 | none | 8.3 |
| A691 / SA691 EFW Pipe Class 40 | normalized and tempered, see 5.3.3 | none | none |
| A691 / SA691 EFW Pipe Class 41 | normalized and tempered, see 5.3.3 | 9 | none |
| A691 / SA691 EFW Pipe Class 42 | normalized and tempered, see 5.3.3 | 9 | 8.3 |
| A691 / SA691 EFW Pipe Class 43 | normalized and tempered, see 5.3.3 | none | 8.3 |
| Pipe Grade | Type of Steel | ASTM Specification | HB, max A | |
| Number | Grade | |||
| CM-65 | carbon-molybdenum steel | A 204/ A204M | A | 201 |
| CM-70 | carbon-molybdenum steel | A 204/ A204M | B | 201 |
| CM-75 | carbon-molybdenum steel | A 204/ A204M | C | 201 |
| CMSH-70 | carbon-manganese-silicon steel, normalized | A 537/A 537M | 1 | |
| CMS-75 | carbon-manganese-silicon steel | A 299/A 299M | … | … |
| CMSH-80 | carbon-manganese-silicon steel, quenched and tempered | A 537/A 537M | 2 | |
| 1/2 CR | 1/2 % chromium, 1/2 % molybdenum steel | A 387/ A 387M | 2 | 201 |
| 1CR | 1 % chromium, 1/2 % molybdenum steel | A 387/ A 387M | 12 | 201 |
| 1-1/4 CR | 1-1/4 % chromium, 1/2 % molybdenum steel | A 387/ A 387M | 11 | 201 |
| 2-1/4 CR | 2-1/2 % chromium, 1 % molybdenum steel | A 387/ A 387M | 22 | 201 |
| 3CR | 3 % chromium, 1 % molybdenum steel | A 387/ A 387M | 21 | 201 |
| 5CR | 5 % chromium, 1/2 % molybdenum steel | A 387/ A 387M | 5 | 225 |
| 9CR | 9 % chromium, 1 % molybdenum steel | A 387/ A 387M | 9 | 241 |
| 91 | 9 % chromium, 1 % molybdenum, vanadium-modified steel (CSEF) | A 387/ A 387M | 91 | 241 |
| Pipe Grade | ASTM Specification | Post-Weld Heat-Treat Temperature Range (Strees Relieving), F ( C) | Normalizing Temperature, max unless otherwise noted, F ( C) | Quenching Temperature, max unless otherwise noted, F ( C) | Tempering Temperature, min, F ( C) |
| CM-65 | A204/ A204M | 1100 to 1200 (59 to 650) | 1700 (925) | … | … |
| CM-70 | A204/ A204M | 1100 to 1200 (59 to 650) | 1701 (925) | … | … |
| CM-75 | A204/ A204M | 1100 to 1200 (59 to 650) | 1702 (925) | … | … |
| CMSH-70 | A537/A 537M | 1100 to 1200 (59 to 650) | 1703 (925) | … | … |
| CMS-75 | A 299/A 299M | 1100 to 1200 (59 to 650) | 1704 (925) | … | … |
| CMSH-80 | A537/A 537M | 1100 to 1200 (59 to 650) | A | 1700 (925) | 1100 to 1250 (59 to 675) |
| 1/2 CR | A387 / A387M | 1100 to 1300 (59 to 705) | 180 (1010) | 1700 (925) | 1150 to 1375 (620 to 74) |
| 1CR | A387 / A387M | 1100 to 1350 (59 to 730) | 181 (1010) | 1700 (925) | 1150 to 1375 (620 to 74) |
| 1-1/4 CR | A387 / A387M | 1100 to 1375 (59 to 74) | 182 (1010) | 1700 (925) | 1150 to 1375 (620 to 74) |
| 2-1/4 CR | A387 / A387M | 1200 to 1400 (650 to 760) | 183 (1010) | 1700 (925) | 1250 to1400 (675 to 760) |
| 3CR | A387 / A387M | 1200 to 1400 (650 to 760) | 184 (1010) | 1700 (925) | 1250 to1400 (675 to 760) |
| 5CR | A387 / A387M | 1200 to 1400 (650 to 760) | 185 (1010) | 1700 (925) | 1300 to 1400 (705 to 760) |
| 9CR | A387 / A387M | 1325 to 1375 (715 to 74) | B | … | 1325 to 1375 (715 to 74) |
| 91 | A387 / A387M | 1350 to 1420 (730 to 770) | 1350 to 1420 (730 to 770) | 190 min (1040 min) | 1350 to 1440 (730 to 780) |
ASTM A691 Grade 91 EFW pipe is used for high-pressure, high-temperature large-diameter steam and process systems requiring modified 9Cr CSEF chemistry when electric-fusion-welded plate pipe is specified.
Both are modified 9Cr CSEF chrome moly families. A335 P91 is seamless pipe; A691 Grade 91 is EFW pipe from PVQ plate. Product form, welding and inspection packages differ — follow the piping class.
CSEF 9Cr materials are sensitive to incorrect heat treatment and welding practice. Soft or over-hard zones can damage creep life or toughness. Projects usually mandate controlled PWHT and hardness surveys.
Yes. We can arrange ASTM A691 / ASME SA691 Grade 91 EFW supply with EN 10204 3.1 or 3.2 MTCs and third-party inspection when required by the purchase order.
We supply this product for domestic and export projects with MTC (EN 10204 3.1 standard; 3.2 / TPI on request). Include destination, Incoterms and inspection needs on the RFQ.