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As a specialized supplier of high-performance industrial piping, we offer ASTM A691 1-1/4CR Pipe, a welded chromium-molybdenum alloy steel pipe designed for high-temperature and high-pressure service. This economically efficient alternative to seamless pipes contains 1.00-1.50% Chromium and 0.44-0.65% Molybdenum, delivering enhanced strength and oxidation resistance comparable to ASTM A335 P11 specifications. Manufactured through advanced fusion welding processes from ASTM A387 Grade 11 Class 2 steel plates, our A691 1-1/4CR welded pipes undergo full heat treatment and rigorous NDE testing, ensuring superior quality for power generation systems, refinery pipelines, and pressure vessel applications. Suitable for bending, welding, and other fabrication processes, these pipes provide reliable performance where corrosion resistance and structural integrity are paramount. Contact us for technical specifications and competitive pricing on your next project requirement.
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Chemical Analysis of ASTM A691 Material
| 1CR | 1-1/4CR | 2-1/4 CR | 5 CR | 9 CR | 91 | |
| C | 0.05-0.17 | 0.05-0.17 | 0.05-0.15 | 0.15 | 0.15 | 0.08-0.12 |
| 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 |
| P | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.020 |
| S | 0.025 | 0.025 | 0.025 | 0.025 | 0.025 | 0.010 |
| Si | 0.15-0.40 | 0.50-0.80 | 0.50 | 0.50 | 1.00 | 0.20-0.50 |
| 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 |
| 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 |
| V | – | – | – | – | 0.04 | 0.18-0.25 |
ASTM A691 GRADE 1 1/4 CR AS Pipes Mechanical Table
| Class | Heat Treatment on Pipe Section see: | Radiography, see Section | Pressure Test, see : |
| 10 | none | none | none |
| 11 | none | 9 | none |
| 12 | none | 9 | 8.3 |
| 13 | none | none | 8.3 |
| 21 | stress relieved, see 6.3.1 | none | none |
| 21 | stress relieved, see 6.3.1 | 9 | none |
| ASTM A691 Class 22 | stress relieved, see 6.3.1 | 9 | 8.3 |
| 23 | stress relieved, see 6.3.1 | none | 8.3 |
| 31 | normalized, see 6.3.2 | none | none |
| 31 | normalized, see 6.3.2 | 9 | none |
| 32 | normalized, see 6.3.2 | 9 | 8.3 |
| 33 | normalized, see 6.3.2 | none | 8.3 |
| 40 | normalized and tempered, see 6.3.3 | none | none |
| 43 | normalized and tempered, see 6.3.3 | 9 | none |
| 43 | normalized and tempered, see 6.3.3 | 9 | 8.3 |
| 43 | normalized and tempered, see 6.3.3 | none | 8.3 |
| 50 | quenched and tempered, see 6.3.4 | none | none |
| 51 | quenched and tempered, see 6.3.4 | 9 | none |
| 52 | quenched and tempered, see 6.3.4 | 9 | 8.3 |
| 53 | quenched and tempered, see 6.3.4 | none | 8.3 |
| 60 | normalized and precipitation heat none none treated | none | none |
| 61 | normalized and precipitation heat none none treated | 9 | none |
| 62 | normalized and precipitation heat none none treated | 9 | 8.3 |
| 63 | normalized and precipitation heat none none treated | none | 8.3 |
| 70 | normalized and precipitation heat none none treated | none | none |
| 71 | normalized and precipitation heat none none treated | 9 | none |
| 72 | normalized and precipitation heat none none treated | 9 | 8.3 |
| 73 | normalized and precipitation heat none none treated | none | 8.3 |
ASTM A691 Class 22 steel pipe Weight Per Foot Chart
ASTM A691 CLASS 22 STEEL PIPE WEIGHT PER FOOT CHART
Heat Treatment of ASME SA691 EFW Pipe
| Pipe Grade | ASTM Specification | Post-Weld Heat-Treat Temperature Range (Stress Relieving), °F (°C) | Normalizing Temperature max unless otherwise noted, | Quenching Temperature max unless otherwise noted,°F (°C) | Tempering Temperature, min, °F (°C) |
| CM-65 | A 204/A 204M | 1100 to 1200 (590 to 650) | 1700 (925) | … | … |
| CM-70 | A 204/A 204M | 1100 to 1200 (590 to 650) | 1700 (925) | … | … |
| CM-75 | A 204/A 204M | 1100 to 1200 (590 to 650) | 1700 (925) | … | … |
| CMSH-70 | A 537/A 537M | 1100 to 1200 (590 to 650) | 1700 (925) | … | … |
| CMS-75 | A 299/A 299M | 1100 to 1200 (590 to 650) | 1700 (925) | … | … |
| CMSH-80 | A 537/A 537M | 1100 to 1200 (590 to 650) | A | 1700( 925) | 1100 to 1250 (590 to 675) |
| 1/2CR | A 387/A 387M | 1100 to 1300 (590 to 705) | 1850 (1010) | 1700( 925) | 150 to 1375 (620to745) |
| 1CR | A 387/A 387M | 1100 to 1350 (590 to 730) | 1850 (1010) | 1700 (925) | 150 to 1375 (620to745) |
| 11⁄4CR | A 387/A 387M | 1100 to 1375 (590 to 745) | 1850 (1010) | 1700 (925) | 150 to 1375 (620to745) |
| 21⁄4CR | A 387/A 387M | 1200 to 1400 (650 to 760) | 1850 (1010) | 1700 (925) | 250 to 1400(675 to760) |
| 3CR | A 387/A 387M | 1200 to 1400 (650 to 760) | 1850 (1010) | 1700 (925) | 250 to1400 (675 to760) |
| 5CR | A 387/A 387M | 1200 to 1400 (650 to 760) | 1850 (1010) | 1650 (900) | 1300 to1400 (705 to760) |
| 9CR | A 387/A 387M | 1325 to 1375 (715 to 745) | B | … | 1325 to1375 (715 to745) |
| ASTM A691 Gr.91 | A 387/A 387M | 1350 to 1420 (730 to 770) | 11900 to 2000 (1040 to 1095) | 1900 min (1040 min) | 1350 to 1440 (730 to 780) |
ASTM A691 Pipe Tensile Chart
| Grade | Tensile (MPa) | Yield (MPa) | Elong. (50mm) | Reduc'n of Area* |
|---|---|---|---|---|
| 1CR | 380 – 550 | 230 min | 22% min | – |
| 1-1/4CR | 415 – 585 | 240 min | 22% min | – |
| 2-1/4CR, 5CR, 9CR | 415 – 585 | 205 min | 18% min | 40% min |
| 91 | 415 – 585 | 205 min | 18% min | 40% min |
| 2 | 485 – 620 | 310 min | 22% min | – |
| 1-1/4CR | 515 – 690 | 310 min | 22% min | – |
| 1CR | 450 – 585 | 275 min | 22% min | – |
| 2-1/4CR, 5CR, 9CR | 515 – 690 | 310 min | 18% min | 40% min |
| 91 | 585 – 760 | 415 min | 18% min | – |
Frequently Asked Questions (FAQ): ASTM A691 1-1/4CR Chromium-Molybdenum Welded Pipe
Q1: What is ASTM A691 1-1/4CR Pipe, and what is its primary application?
A: ASTM A691 1-1/4CR is a specification for welded chromium-molybdenum alloy steel pipe intended for high-temperature and high-pressure service. The "1-1/4CR" denotes a chemical grade with approximately 1.25% Chromium content. Its primary application is in power generation boilers, refinery piping systems, and process industry equipment where elevated temperature strength and oxidation resistance are required, but a cost-effective welded option is suitable for the design conditions.
Q2: How does A691 1-1/4CR differ from a seamless pipe like A335 P11?
A: The core difference is the manufacturing method:
A691 1-1/4CR is a welded pipe, formed from plate or sheet and then fusion-welded (typically using SAW - Submerged Arc Welding). It is often more readily available in larger diameters and can be more economical.
A335 P11 is a seamless pipe, manufactured by piercing a solid billet, making it inherently uniform around its circumference with no longitudinal weld seam.
While they share a similar chemical composition and are often considered equivalents, the presence of the weld seam in A691 pipe is a critical design consideration for certain high-cyclic or highly critical services.
Q3: What is the chemical composition and mechanical properties of this grade?
A:
Chemical Composition (Typical):
Chromium (Cr): 1.00% - 1.50%
Molybdenum (Mo): 0.44% - 0.65%
Carbon (C), Manganese (Mn), Silicon (Si), etc., are controlled per the standard.
Mechanical Properties (Minimum):
Tensile Strength: 415 MPa (60,000 psi)
Yield Strength: 205 MPa (30,000 psi)
These properties are comparable to the seamless ASTM A335 P11 grade.
Q4: What is the significance of the "CMQ" suffix sometimes seen with this specification?
A: CMQ stands for "Carbon Manganese Quality" and is a supplementary requirement in the ASTM A691 standard. When specified (e.g., A691 1-1/4CR CMQ), it mandates stricter control over the chemical composition, particularly lower carbon and sulfur content, which significantly enhances the pipe's weldability and toughness for critical applications.
Q5: Is this pipe supplied in the heat-treated condition?
A: Yes. According to the standard, ASTM A691 1-1/4CR pipe must be supplied in a fully heat-treated condition-normalized, normalized and tempered, or quenched and tempered. This heat treatment is essential to refine the grain structure, ensure homogeneous mechanical properties, and temper the weld seam, making it comparable to the base material.
Q6: What level of Non-Destructive Examination (NDE) is performed on the weld seam?
A: The standard requires 100% non-destructive examination of the entire weld seam. The most common method is Radiographic Testing (RT) or Ultrasonic Testing (UT). The specific NDE method and acceptance criteria are defined by the purchase order and are crucial for verifying the integrity of the weld.
Q7: What are the standard dimensions and size ranges available?
A: A691 1-1/4CR is typically available in larger diameters and wall thicknesses commonly used for main process lines. It is regularly supplied from outside diameters of 18 inches (NPS 450) and above, with walls often exceeding 0.75 inches (19 mm). We recommend consulting with us for specific size and schedule availability.
Q8: Can we get matching fittings and flanges for an A691 1-1/4CR piping system?
A: Absolutely. For a fully compatible system, the following standards apply:
Pipe Fittings (Elbows, Tees, Reducers): ASTM A234 WP11
Flanges: ASTM A182 F11
These grades are chemically and mechanically matched to ensure integrity during welding and operation.
Q9: What documentation do you provide with the material?
A: We supply all pipe with a complete Material Test Certificate (MTC) per EN 10204 3.1/3.2. This certificate includes certified chemical analysis, mechanical test results, heat treatment records, and a statement of compliance with the NDE requirements. Traceability to the original heat number is guaranteed.
Q10: Is A691 1-1/4CR compliant with major international pressure piping codes?
A: Yes. This material is fully recognized and approved for use in accordance with major codes such as ASME B31.1 (Power Piping) and ASME B31.3 (Process Piping). Our documentation supports compliance with directives like the European PED 2014/68/EU.
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