ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe is an advanced alloy steel pipe produced via the process of Electric Fusion Welding by employing high-quality pressure vessel plates and filler metal. As the name suggests, this grade of pipes is designed for applications involving high-pressure and high-temperature conditions, it can perform well in harsh condition due to the presence of both chromium and molybdenum in this alloy. These pipes are available in different classes depending upon the type of heat treatment and tests carried out during their production. This particular type of pipe is commonly used in extensive applications like power generation plants, refineries, and petrochemical industries. At USA Piping Solution, we offer you the best ASTM A691 Grade 22 EFW pipes along with other grades also which are made with strict quality check to provide a equal performance in different industries.
Specification of ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe
| Parameter | Details |
|---|---|
| Grades | Cl22, 1Cr, 1¼Cr, 2¼Cr, 3Cr, 5Cr, 9Cr, 91, CM65, CM70, CM75 |
| Size Range | 1/2” NB to 36” NB |
| Thickness | 3 mm to 12 mm |
| Schedules | SCH 5, 10, 20, 30, 40, 80, 120, 160, XXS |
| Class Designation | Class 10 to Class 73 |
| Pipe Types | Seamless, ERW, Welded, LSAW, Fabricated |
| Manufacturing | Cold drawn, Cold rolled |
| Origin | European, Japanese, Korean, US, Russian, Indian |
| Tolerance | Cold drawn: ±0.1 mm Cold rolled: ±0.05 mm |
Chemical Composition of ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe
| Element | 1Cr | 1-1/4Cr | 2-1/4Cr | 5Cr | 9Cr | 91 |
|---|---|---|---|---|---|---|
| Carbon (C) | 0.05–0.17 | 0.05–0.17 | 0.05–0.15 | 0.15 max | 0.15 max | 0.08–0.12 |
| Manganese (Mn) | 0.40–0.65 | 0.40–0.65 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 |
| Phosphorus (P) | 0.025 max | 0.025 max | 0.025 max | 0.025 max | 0.025 max | 0.020 max |
| Sulfur (S) | 0.025 max | 0.025 max | 0.025 max | 0.025 max | 0.025 max | 0.010 max |
| Silicon (Si) | 0.15–0.40 | 0.50–0.80 | 0.50 max | 0.50 max | 1.00 max | 0.20–0.50 |
| Chromium (Cr) | 0.80–1.15 | 1.00–1.50 | 2.00–2.50 | 4.00–6.00 | 8.00–10.00 | 8.00–9.50 |
| Molybdenum (Mo) | 0.45–0.60 | 0.45–0.65 | 0.90–1.10 | 0.45–0.65 | 0.90–1.10 | 0.85–1.05 |
| Vanadium (V) | — | — | — | — | 0.04 max | 0.18–0.25 |
Mechanical Properties of ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Reduction of Area (%) |
|---|---|---|---|---|
| 1Cr | 380 – 550 | ≥ 230 | ≥ 22 | — |
| 1-1/4Cr | 415 – 585 | ≥ 240 | ≥ 22 | — |
| 2-1/4Cr | 415 – 585 | ≥ 205 | ≥ 18 | ≥ 40 |
| 5Cr | 415 – 585 | ≥ 205 | ≥ 18 | ≥ 40 |
| 9Cr | 415 – 585 | ≥ 205 | ≥ 18 | ≥ 40 |
| 91 | 415 – 585 | ≥ 205 | ≥ 18 | ≥ 40 |
ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe Sizes
| OD (mm) | WT (mm) | Size (Inch) | Schedule | Weight (kg/m) |
|---|---|---|---|---|
| 13.72 | 1.65 | 1/4” | 10S | 0.50 |
| 13.72 | 2.24 | 1/4” | 40S | 0.64 |
| 13.72 | 3.02 | 1/4” | 80S | 0.81 |
| 17.15 | 1.65 | 3/8” | 10S | 0.64 |
| 17.15 | 2.31 | 3/8” | 40S | 0.86 |
| 21.34 | 2.77 | 1/2” | 40S | 1.29 |
| 26.67 | 3.91 | 3/4” | 80S | 2.23 |
| 33.40 | 3.38 | 1” | 40S | 2.54 |
| 42.16 | 3.56 | 1 1/4” | 40S | 3.44 |
| 48.26 | 5.08 | 1 1/2” | 80S | 5.49 |
Weight Chart of ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe
| Size (NPS) | O.D. (in) | Wall (in) | I.D. (in) | Wt (lb/ft) | Schedule / Class | Section Modulus (in³) | Gallons per Foot |
|---|---|---|---|---|---|---|---|
| 1/2 | 0.840 | 0.109 | 0.622 | 0.85 | STD / 40 | 0.0407 | 0.0158 |
| 0.147 | 0.546 | 1.09 | XHY / 80 | 0.0478 | 0.0122 | ||
| 0.294 | 0.252 | 1.72 | XXHY | 0.0577 | 0.0026 | ||
| 3/4 | 1.050 | 0.113 | 0.824 | 1.13 | STD / 40 | 0.0705 | 0.0277 |
| 0.154 | 0.742 | 1.48 | XHY / 80 | 0.0853 | 0.0225 | ||
| 0.308 | 0.434 | 2.44 | XXHY | 0.1103 | 0.0077 | ||
| 1 | 1.315 | 0.133 | 1.049 | 1.68 | STD / 40 | 0.1328 | 0.0449 |
| 0.179 | 0.957 | 2.17 | XHY / 80 | 0.1606 | 0.0374 | ||
| 0.358 | 0.599 | 3.66 | XXHY | 0.2136 | 0.0146 | ||
| 1 1/4 | 1.660 | 0.140 | 1.380 | 2.27 | STD / 40 | 0.2346 | 0.0777 |
| 0.191 | 1.278 | 3.00 | XHY / 80 | 0.2913 | 0.0666 | ||
| 0.382 | 0.896 | 5.22 | XXHY | 0.4110 | 0.0328 | ||
| 1 1/2 | 1.900 | 0.145 | 1.610 | 2.72 | STD / 40 | 0.3262 | 0.1058 |
| 0.200 | 1.500 | 3.63 | XHY / 80 | 0.4118 | 0.0918 | ||
| 0.400 | 1.100 | 6.41 | XXHY | 0.5977 | 0.0494 | ||
| 2 | 2.375 | 0.154 | 2.067 | 3.66 | STD / 40 | 0.5606 | 0.1743 |
| 0.218 | 1.939 | 5.03 | XHY / 80 | 0.7309 | 0.1534 | ||
| 0.436 | 1.503 | 9.04 | XXHY | 1.1043 | 0.0922 | ||
| 3 | 3.500 | 0.216 | 3.068 | 7.58 | STD / 40 | 1.7241 | 0.3840 |
| 0.300 | 2.900 | 10.26 | XHY / 80 | 2.2253 | 0.3431 | ||
| 0.600 | 2.300 | 18.60 | XXHY | 3.4243 | 0.2158 | ||
| 4 | 4.500 | 0.237 | 4.026 | 10.80 | STD / 40 | 3.2140 | 0.6613 |
| 0.337 | 3.826 | 15.00 | XHY / 80 | 4.2713 | 0.5972 | ||
| 0.674 | 3.152 | 27.57 | XXHY | 6.7927 | 0.4054 | ||
| 6 | 6.625 | 0.280 | 6.065 | 18.99 | STD / 40 | 8.4958 | 1.5008 |
| 0.432 | 5.761 | 28.60 | XHY / 80 | 12.2241 | 1.3541 | ||
| 0.864 | 4.897 | 53.21 | XXHY | 20.025 | 0.9784 |
Different Types of ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe
A691 Round Pipes
1.5 mm Thickness
A691 Grade 91 Pipe
1/2 inch
SA691 EFW Pipe
2 inch Mirror Polished
A691 Welded Pipe
8 inch Seamless
A691 Steel Pipe
14 inch, Schedule 40
A691 SAW Steel Pipe
Gr. 1.25 CR/CL
A691 Seamless Pipes
Nominal Size 3 inch
A691 Seamless Pipe Tube
4 mm Thickness
A691 Square Pipe
Hot-Rolled, 100 mm OD
A691 Welded Pipes
Schedule 40
A691 EFW Pipes
2 inch, 2–5 mm Thick
A691 CLASS 42 EFW Pipe
2 inch
ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe Thickness Chart
| Pipe Type | Outer Diameter (OD) | Wall Thickness (Schedule) | Length |
|---|---|---|---|
| A691 Alloy Steel EFW Pipe | 1/2” NB – 60” NB | SCH 5, 10, 40, 80, 160 | Custom |
| ASTM A691 Welded Pipe | 1/2” NB – 24” NB | As per requirement | Custom |
| ASTM A691 ERW Pipe | 1/2” NB – 24” NB | As per requirement | Custom |
| Alloy Gr.5 CR High Pressure Boiler Pipe | 16” NB – 100” NB | As per requirement | Custom |
Heat Treatment Chart for ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe
| Pipe Grade | ASTM Plate Spec | Post-Weld Heat-Treat (PWHT) [°F (°C)] | Normalizing Temp. [°F (°C)] | Quenching Temp. [°F (°C)] | Tempering Temp. Min [°F (°C)] |
|---|---|---|---|---|---|
| CM-65 | A 204 | 1100–1200 (590–650) | 1700 (925) | — | — |
| CM-70 | A 204 | 1100–1200 (590–650) | 1700 (925) | — | — |
| CM-75 | A 204 | 1100–1200 (590–650) | 1700 (925) | — | — |
| CMSH-70 | A 537 | 1100–1200 (590–650) | 1700 (925) | — | — |
| CMS-75 | A 299 | 1100–1200 (590–650) | 1700 (925) | — | — |
| CMSH-80 | A 537 | 1100–1200 (590–650) | See Note A | 1700 (925) | 1100–1250 (590–675) |
| 1/2 CR | A 387 | 1100–1300 (590–705) | 1850 (1010) | 1700 (925) | 1150–1375 (620–745) |
| 1 CR | A 387 | 1100–1350 (590–730) | 1850 (1010) | 1700 (925) | 1150–1375 (620–745) |
| 1 1/4 CR | A 387 | 1100–1375 (590–745) | 1850 (1010) | 1700 (925) | 1150–1375 (620–745) |
| 2 1/4 CR | A 387 | 1200–1400 (650–760) | 1850 (1010) | 1700 (925) | 1250–1400 (675–760) |
| 3 CR | A 387 | 1200–1400 (650–760) | 1850 (1010) | 1700 (925) | 1250–1400 (675–760) |
| 5 CR | A 387 | 1200–1400 (650–760) | 1850 (1010) | 1650 (900) | 1300–1400 (705–760) |
| 9 CR | A 387 | 1325–1375 (715–745) | See Note B | — | 1325–1375 (715–745) |
| Gr. 91 | A 387 | 1350–1420 (730–770) | 1900–2000 (1040–1095) | 1900 Min (1040 Min) | 1350–1440 (730–780) |
Comparison Table of Grade 22 vs Grade 11 (1¼Cr-½Mo)
| Property | This Grade (Grade 22) | Grade 11 (1¼Cr-½Mo) | Key Difference |
|---|---|---|---|
| Cr content | 2.00–2.50 | 1.00–1.50 | Grade 22 higher Cr = better high-temp oxidation resistance |
| Mo content | 0.87–1.13 | 0.44–0.65 | Grade 22 higher Mo = better creep resistance |
| Max service temp | ~550°C | ~510°C | Grade 22 preferred for higher temp |
| PWHT temp | 675–760°C | 675–760°C | Same range — different hold time |
| Hardness limit | 241 HB max | 241 HB max | Same limit |
| Typical use | High-temp power piping, hydrotreaters | Mid-temp power piping, steam lines | Different service windows |
Application and Industrial Use of ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe
- Power Plants
- Oil & Gas
- Petrochemical Industry
- Chemical Industry
- Refinery Industry
- Energy Sector
- Thermal Plants
- Offshore Industry
- Engineering Industry
- Process Industry
- Heavy Industry
- Manufacturing Industry
ASTM A691 2-1/4Cr-1Mo (Grade 22) EFW Pipe Price List
| Product / Material Type | Manufacturing Type | Estimated Price (USD) |
|---|---|---|
| ASTM A691 Gr. 1.25 CR/CL | SAW (Submerged Arc Welded) | 450.00 – 550.00 per unit/ton |
| ASTM A691 5CR | Welded / ERW | 900.00 – 1,200.00 per unit/ton |
| General ASTM A691 Material | Various | 1,200.00 – 5,000.00 per unit/ton |
Related Products
| Tier Level | Product Link | Industry Usage / Application Context |
|---|---|---|
| Primary | ASTM A691 EFW Alloy Steel Pipe | Used across power plants, refineries, and high-pressure industrial piping systems |
| Primary | Chrome Moly Pipes & Tubes | Widely used in petrochemical, oil & gas, and thermal power industries |
| Secondary | ASTM A691 Grade 11 (1¼Cr-½Mo) EFW Pipe | Suitable for moderate temperature applications in power plants and process piping |
| Secondary | ASTM A691 Grade 91 (9Cr-1Mo-V) EFW Pipe | Used in ultra-high temperature service like boilers and superheaters |
| Secondary | ASTM A335 P22 Alloy Steel Pipe | Common in seamless piping systems for power plants and refinery units |
| Secondary | Alloy Steel Welded Pipes & Tubes | Used in structural, industrial, and pressure vessel applications |
| Supporting | Alloy Steel Pipes & Tubes | Used across general engineering, infrastructure, and industrial piping sectors |
Frequently Asked Questions
What is ASTM A691 Grade 22 pipe?
ASTM A691 Grade 22 pipe is an electric-fusion-welded (EFW) alloy steel pipe made from 2-1/4Cr-1Mo plates, designed for high-temperature and high-pressure service.
What is the chemical composition of ASTM A691 2-1/4Cr-1Mo pipe?
It mainly contains chromium (2.00–2.50) and molybdenum (0.90–1.10), along with carbon, manganese, silicon, and trace elements.
What are the mechanical properties of ASTM A691 Grade 22 pipe?
It offers good tensile strength, high creep resistance, and excellent performance under elevated temperature conditions.
Where is ASTM A691 Grade 22 pipe used?
It is commonly used in power plants, refineries, petrochemical industries, and high-temperature piping systems.
What is the difference between ASTM A691 Grade 22 and ASTM A335 P22 pipe?
A691 Grade 22 is a welded (EFW) pipe made from plates, while A335 P22 is a seamless pipe; both have similar composition but differ in manufacturing and application.