A691 5Cr-1/2Mo (Grade 5) by ASTM is an electric fusion-welded pipe specification made from pressure vessel plates, utilizing filler material. This grade is suitable for applications that need high strength and corrosion resistance at higher pressures and temperatures, owing to its chromium and molybdenum composition. Heat treatment may be necessary, based on the requirements for mechanical strength, and the pipe may be manufactured according to tight tolerances for quality assurance, including welding and mechanical tests. A691 Grade 5 Pipes are mostly found in diameters greater than 16 inches and have multiple applications in the energy and refining industry. At USA Piping Solution, we provide the highest quality of ASTM A691 5Cr-1/2Mo (Grade 5) material and all the other products that are commonly used in different industries according to their requirements.
Specification of ASTM A691 5Cr-1/2Mo (Grade 5)
| Feature | Specification Details |
|---|---|
| Standard | ASTM A691: Carbon and Alloy Steel Pipe, Electric-Fusion-Welded |
| Grades | 1-1/4CR, 2-1/4CR, 5CR, 9CR, 9, P5, P9, P11, P12, P22, P91 |
| Pipe Types | LSAW / SAW / EFW (Seamless options included in sizing) |
| Class Designation | Classes 10 through 73 (e.g., 10, 11, 22, 32, 42, 62, 72, etc.) |
| Outer Diameter (OD) | Seamless: 17–914mm (3/8”–36”) LSAW: 457–1422mm (18”–56”) |
| Wall Thickness | 2–60mm (SCH 10 through XXS) |
| Technical Methods | Hot-rolled, Cold-drawn, Hot-expanded |
| Length | Single/Double Random; 5m to 14m (standard 6m/12m) |
| Ends | Plain, Beveled, Grooved, Threaded & Coupled; Plastic caps protected |
| Surface Treatment | Bare, Black Painting, Varnished, Galvanized, 3PE/FBE Coating |
| Testing Methods | Eddy Current, Hydrostatic, Ultrasonic (UT), NDT, Chemical/Physical property |
Chemical Composition of ASTM A691 5Cr-1/2Mo (Grade 5)
| Element | 1CR | 1-1/4CR | 2-1/4CR | 5 CR | 9 CR | 91 |
|---|---|---|---|---|---|---|
| C (Carbon) | 0.05–0.17 | 0.05–0.17 | 0.05–0.15 | 0.15 max | 0.15 max | 0.08–0.12 |
| Mn (Manganese) | 0.40–0.65 | 0.40–0.65 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 | 0.30–0.60 |
| P (Phosphorus) | 0.025 max | 0.025 max | 0.025 max | 0.025 max | 0.025 max | 0.020 max |
| S (Sulfur) | 0.025 max | 0.025 max | 0.025 max | 0.025 max | 0.025 max | 0.010 max |
| Si (Silicon) | 0.15–0.40 | 0.50–0.80 | 0.50 max | 0.50 max | 1.00 max | 0.20–0.50 |
| Cr (Chromium) | 0.80–1.15 | 1.00–1.50 | 2.00–2.50 | 4.00–6.00 | 8.00–10.00 | 8.00–9.50 |
| Mo (Molybdenum) | 0.45–0.60 | 0.45–0.65 | 0.90–1.10 | 0.45–0.65 | 0.90–1.10 | 0.85–1.05 |
| V (Vanadium) | — | — | — | — | 0.04 max | 0.18–0.25 |
Mechanical Properties of ASTM A691 5Cr-1/2Mo (Grade 5)
| Condition | Yield MPa / ksi | UTS MPa / ksi | Elongation | Hardness |
|---|---|---|---|---|
| Annealed | ≥205 / ≥30 | ≥415 / ≥60 | ≥30 | ≤241 HB |
ASTM A691 5Cr-1/2Mo (Grade 5) Heat Treatment
| Pipe Grade | ASTM Plate Spec | Post-Weld Heat-Treat (PWHT) [°F (°C)] | Normalizing Temp. Max [°F (°C)] | Quenching Temp. Max [°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) | 1700 (925) | 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) | — | — | 1325–1375 (715–745) |
| 91 | A 387 | 1350–1420 (730–770) | 1900–2000 (1040–1095) | 1900 min (1040 min) | 1350–1440 (730–780) |
Size Chart of ASTM A691 Grade 5 CR Pipe
| NPS (Inch) | O.D. (mm) | SCH 20 (Wall / Wt) | SCH 30 (Wall / Wt) | STD / SCH 40 (Wall / Wt) | SCH 60 (Wall / Wt) | Extra Strong (XS) (Wall / Wt) |
|---|---|---|---|---|---|---|
| 1/8 | 10.3 | — | — | 1.73 / 0.37 | — | 2.41 / 0.47 |
| 1/4 | 13.7 | — | — | 2.24 / 0.63 | — | 3.02 / 0.80 |
| 3/8 | 17.1 | — | — | 2.31 / 0.84 | — | 3.20 / 1.11 |
| 1/2 | 21.3 | — | — | 2.77 / 1.26 | — | 3.73 / 1.62 |
| 3/4 | 26.7 | — | — | 2.87 / 1.69 | — | 3.91 / 2.22 |
| 1 | 33.4 | — | — | 3.38 / 2.50 | — | 4.55 / 3.24 |
| 1 1/4 | 42.2 | — | — | 3.56 / 3.39 | — | 4.85 / 4.47 |
| 1 1/2 | 48.3 | — | — | 3.68 / 4.05 | — | 5.08 / 5.41 |
| 2 | 60.3 | — | — | 3.91 / 5.44 | — | 5.54 / 7.48 |
| 2 1/2 | 73.0 | — | — | 5.16 / 8.63 | — | 7.01 / 11.41 |
| 3 | 88.9 | — | — | 5.49 / 11.30 | — | 7.62 / 15.27 |
| 4 | 114.3 | — | — | 6.02 / 16.07 | — | 8.56 / 22.32 |
| 6 | 168.3 | — | — | 7.11 / 28.26 | — | 10.97 / 42.56 |
| 8 | 219.1 | 6.35 / 33.3 | 7.04 / 36.8 | 8.18 / 42.5 | 10.31 / 53.1 | 12.70 / 64.6 |
| 10 | 273.0 | 6.35 / 41.7 | 7.80 / 51.3 | 9.27 / 60.3 | 12.70 / 81.5 | 12.70 / 81.5 |
| 12 | 323.9 | 6.35 / 49.7 | 8.46 / 65.2 | 9.53 / 73.8 | 14.27 / 109.0 | 12.70 / 97.4 |
| 14 | 355.6 | 7.92 / 68.1 | 9.53 / 81.3 | 9.53 / 81.3 | 15.09 / 126.4 | 12.70 / 107.0 |
| 16 | 406.4 | 7.92 / 77.9 | 9.53 / 93.3 | 9.53 / 93.3 | 16.66 / 160.0 | 12.70 / 123.0 |
| 18 | 457.2 | 7.92 / 87.8 | 11.13 / 122.0 | 9.53 / 105.0 | 19.05 / 206.0 | 12.70 / 138.0 |
| 20 | 508.0 | 9.53 / 117.0 | 12.70 / 155.0 | 9.53 / 117.0 | 20.62 / 248.0 | 12.70 / 155.0 |
| 24 | 609.6 | 9.53 / 141.0 | 14.27 / 210.0 | 9.53 / 141.0 | 24.61 / 355.0 | 12.70 / 187.0 |
Types of ASTM A691 Grade 5 CR Pipe
Alloy Steel A691 5 CR Welded Pipes
ASTM A/SA 691 Alloy Steel Welded Pipe, Cr-Mo A691 5 Cr Welded Pipes, Alloy Gr 5 Cr Welded Pipe.
Alloy Steel A691 5 CR EFW Pipes
Alloy A691 EFW Pipes, Chromium Molybdenum Steel, ASTM A691 Chrome-Moly EFW Pipe.
Alloy Steel A691 High Pressure Pipes
ASTM A691 Alloy Steel High Pressure Pipes Supplier, Boiler Pipes Exporter & High Temperature Pipes.
ASTM A691 Grade 5 CR Pipe Different Classes
| Class | Heat Treatment (on Pipe Section) | Radiography (Section 9) | Pressure Test (Section 8.3) |
|---|---|---|---|
| 10 | None | None | None |
| 11 | None | 100 | None |
| 12 | None | 100 | Yes |
| 13 | None | None | Yes |
| 20 | Stress Relieved | None | None |
| 21 | Stress Relieved | 100 | None |
| 22 | Stress Relieved | 100 | Yes |
| 23 | Stress Relieved | None | Yes |
| 30 | Normalized | None | None |
| 31 | Normalized | 100 | None |
| 32 | Normalized | 100 | Yes |
| 33 | Normalized | None | Yes |
| 40 | Normalized & Tempered | None | None |
| 41 | Normalized & Tempered | 100 | None |
| 42 | Normalized & Tempered | 100 | Yes |
| 43 | Normalized & Tempered | None | Yes |
| 50 | Quenched & Tempered | None | None |
| 51 | Quenched & Tempered | 100 | None |
| 52 | Quenched & Tempered | 100 | Yes |
| 53 | Quenched & Tempered | None | Yes |
| 60 | Normalized & Precipitation Heat Treated | None | None |
| 61 | Normalized & Precipitation Heat Treated | 100 | None |
| 62 | Normalized & Precipitation Heat Treated | 100 | Yes |
| 63 | Normalized & Precipitation Heat Treated | None | Yes |
| 70 | Quenched & Precipitation Heat Treated | None | None |
| 71 | Quenched & Precipitation Heat Treated | 100 | None |
| 72 | Quenched & Precipitation Heat Treated | 100 | Yes |
| 73 | Quenched & Precipitation Heat Treated | None | Yes |
Comparison Between Grade 5 vs Grade 22 (2¼Cr-1Mo)
| Property | This Grade | Grade 22 (2¼Cr-1Mo) | Key Difference |
|---|---|---|---|
| Cr content | 4.00–6.00 | 2.00–2.50 | Grade 5 higher Cr = better H₂ attack resistance |
| H₂ attack resistance | High — suitable for high H₂PP | Moderate | Grade 5 is the correct choice for high H₂PP |
| Nelson curve position | Above carbon steel curve at high H₂PP+temp | Borderline at high H₂PP | Grade 5 provides more safety margin |
| Primary use | Refinery hydrotreating, hydrocracking | Power piping, general high-temp | Different industries/applications |
| PWHT temp | 730–790°C | 675–760°C | Grade 5 higher PWHT — higher alloy content |
| Preheat | ≥200°C | ≥150°C | Grade 5 needs more preheat |
Application of ASTM A691 Grade 5 CR Pipe
- Refinery hydrotreating units
- Hydrocracking processes
- Power generation plants
- High-temperature piping systems
- Petrochemical industries
- Oil and gas processing facilities
- Pressure vessel fabrication
- Steam generation systems
Price List Chart of ASTM A691 Grade 5 CR Pipe
| Product Description | Pricing Unit | FOB Price (USD) |
|---|---|---|
| Standard ASTM A691 / SA 691 Grade 5 CR Pipes | Ton | 355 – 1,500 |
| Chromium Molybdenum (Cr-Mo) Grade 5 CR Pipes | Ton / Metric Ton | 325 – 1,700 |
| High-Pressure Loading Specific Pipes | Ton | 1,000 – 2,990 |
| High-Temperature Service Specific Pipes | Ton | 1,200 – 16,000 |
| EFW (Electric-Fusion-Welded) Pipes | Metric Ton | 1,450 – 3,890 |
| Cold Drawn Alloy Steel Pipes | Metric Ton | 2,500 – 4,500 |
| Hot Rolled Alloy Steel Pipes | Metric Ton | 950 – 2,000 |
| IBR Approved (Boiler Regulated) Pipes | Ton | 500 – 1,990 |
| EFW Pipes (Kilogram Rate) | Kilogram | 6.90 – 7.00 |
| High Quality Specialty Pipes (Kilogram Rate) | Kilogram | 45 – 200 |
| Pressure Pipes (Sample/Small Unit) | Piece | 1 – 100 |
Different Grades of ASTM A691 Grade 5 CR Pipe
- ASTM A691 EFW Alloy Steel Pipe
- Chrome Moly Pipes & Tubes
- ASTM A691 Grade 22 (2¼Cr-1Mo) EFW Pipe
- ASTM A691 Grade 9 (9Cr-1Mo) EFW Pipe
- ASTM A335 P5 Alloy Steel Pipe
- Alloy Steel Pipes & Tubes
Frequently Asked Questions
What is ASTM A691 Grade 5 Cr pipe?
ASTM A691 Grade 5 Cr pipe is an electric-fusion-welded (EFW) alloy steel pipe made from chromium-molybdenum plates, designed for high-pressure and high-temperature service.
What is the chemical composition of ASTM A691 5Cr pipe?
It mainly contains chromium (around 4–6%), molybdenum (about 0.45–0.65%), along with carbon, manganese, silicon, and other elements.
What are the mechanical properties of ASTM A691 Grade 5 pipe?
It offers high strength, good creep resistance, excellent heat resistance, and durability under high-pressure conditions.
Where is ASTM A691 Grade 5 Cr pipe used?
It is commonly used in power plants, refineries, petrochemical industries, and high-temperature piping systems.
What is the difference between A691 5Cr and A335 P5 pipe?
A691 5Cr is a welded (EFW) pipe made from plates, while A335 P5 is a seamless pipe; both have similar composition but differ in manufacturing process and applications.