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ASTM A691 Grade 91 Alloy Steel Pipes ASTM A691 Grade 91 Alloy Steel EFW Pipes  are specially designed for use in high-pressure and high-temperature environments. These pipes are widely used in industries like oil and gas, power generation, and chemical processing due to their strength and durability. The manufacturing process starts with high-quality pressure vessel plates that offer excellent mechanical properties and resistance to extreme conditions. These plates are selected carefully to ensure the final product meets strict industry standards. The pipes are made using the Electric Fusion Welding (EFW) process, which creates strong, seamless joints by melting and fusing the edges of the plates using electric current. This method ensures high structural integrity and allows the pipes to handle intense pressure and stress. To guarantee performance, the pipes go through strict testing like hydrostatic testing for pressure resistance and non-destructive methods such as ultrasonic and radiographic inspection to check weld quality. These tests ensure the pipes are safe and reliable for demanding applications. Thanks to their alloy composition, these pipes also offer excellent resistance to heat, oxidation, and corrosion. This makes ASTM A691 Grade 91 EFW Pipes a dependable choice for long-term use in tough industrial environments. Table of Contents ASTM A691 Pipe Price in India ASTM A691 Pipe Equivalent ASTM A691 Pipe Specifications ASTM A691 Chemical Composition ASTM A691 Mechanical Properties Heat Treatment Tensile Requirements ASTM A691 Pipe Price in India (USD $/Ton) Size MSL Make ISMT Make JSL Make 1.5″ 3,750.00 3,742.65 3,757.35 1″ 3,897.06 3,889.71 3,904.41 1/2″ 4,264.71 4,257.35 4,272.06 1.25″ 3,852.94 3,845.59 3,860.29 3/4″ 4,044.12 4,036.76 4,051.47 Note: Prices applicable for SCH 40, SCH 60, SCH 80 & SCH XS. ASTM A691 Pipe Equivalent Grades Pipe Grade Type of Steel ASTM Specification Grade HB max CM-65 Carbon-Molybdenum Steel A204/A204M A 201 CM-70 Carbon-Molybdenum Steel A204/A204M B 201 CM-75 Carbon-Molybdenum Steel A204/A204M C 201 1 CR 1% Chromium, 0.5% Molybdenum Steel A387/A387M 12 201 2-1/4 CR 2.25% Chromium, 1% Molybdenum Steel A387/A387M 22 201 5 CR 5% Chromium, 0.5% Molybdenum Steel A387/A387M 5 225 9 CR 9% Chromium, 1% Molybdenum Steel A387/A387M 9 241 91 Chromium-Molybdenum-Vanadium Alloy A387/A387M 91 241 ASTM A691 Pipe Specifications Grades: 1CR, 1-1/4CR, 2-1/4CR, 3CR, 5CR, 9CR, 91, CM65, CM70, CM75 Sizes: 1/2” NB to 36” NB Wall Thickness: 3mm to 12mm Type: Seamless / ERW / Welded / Fabricated / LSAW End Type: Plain, Beveled, Threaded Form: Round, Square, Rectangular, Hydraulic Length: Standard, Double Random, Cut Length Manufacturing Origin: Indian, European, US, Korean, Japanese (No Chinese origin) Special Testing: NACE MR0175, HIC Test, SSC Test, IBR, H2 Service ASTM A691 Chemical Composition Element 1CR 1-1/4CR 2-1/4CR 5CR 9CR 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 Grade 91 also includes: Ni ≤ 0.40%, Nb 0.06–0.10%, N 0.030–0.070%, Al ≤ 0.02%, Ti ≤ 0.01%, Zr ≤ 0.01%  ASTM A691 Mechanical Properties Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (50mm) Reduction of Area* 1CR 380 – 550 230 min 22% min – 1-1/4CR 415 – 585 240 min 22% min – 2-1/4CR 415 – 585 205 min 18% min 40% min 5CR 415 – 585 205 min 18% min 40% min 9CR 415 – 585 205 min 18% min 40% min 91 415 – 585 205 min 18% min 40% min   Heat Treatment Summary CM Grades (65–75): Stress relieved at 1100–1200°F, Normalized at 1700°F 1/2CR – 3CR: Normalizing temp: 1850°F, Quenching: 1700°F, Tempering: up to 1375°F 5CR – 9CR: Normalizing at 1850°F, Tempering at 1300–1375°F 91: Complex heat treatment with Tempering at 1350–1440°F and minimum quenching at 1900°F Applications Industry Use: Oil & Gas, Power Plants, Refineries Common Usage: Steam pipelines, heat exchangers, boiler tubes, pressure vessels Strengths: Excellent creep strength, oxidation resistance, and ability to handle high pressure and temperature These pipes are highly valued for their reliable performance and compliance with global standards. Their manufacturing process involves stringent quality control, and they are available in a wide variety of grades and specifications to suit different industrial needs. For more information or specific grade inquiries, feel free to reach out to your ASTM A691 pipe supplier or stockist. Ready to Ship, Wherever You Are Need reliable supplies for your next big project? Whether you’re based in the india or shipping internationally, we’re here to make sourcing simple. We supply across the USA, Canada, Australia, Germany, Brazil , and United Kingdom.Fast quotes, custom sizes, and bulk orders available. Let us know what you need—we’ll take care of the rest.   Supplies from Different Countries Supplies from Different Countries Flag Country Code 🇮🇳 India IN 🇺🇸 United States US 🇬🇧 United Kingdom GB 🇨🇳 China CN 🇯🇵 Japan JP 🇩🇪 Germany DE 🇮🇹 Italy IT 🇹🇷 Turkey TR 🇦🇪 United Arab Emirates AE 🇸🇦 Saudi Arabia SA 🇶🇦 Qatar QA 🇴🇲 Oman OM 🇰🇼 Kuwait KW 🇦🇺 Australia AU 🇨🇦 Canada CA 🇳🇱 Netherlands NL 🇮🇩 Indonesia ID 🇪🇬 Egypt EG

ASTM A691 Alloy Steel EFW Pipes ASTM A691 is a highly specialized and widely adopted standard developed by the American Society for Testing and Materials (ASTM) for electric-fusion-welded (EFW) steel pipes used in critical high-temperature and high-pressure service environments. These pipes are manufactured using pressure vessel-quality carbon or alloy steel plates, and the welding is carried out using added filler metal to ensure exceptional strength, integrity, and durability at elevated service conditions. The need for ASTM A691-grade pipes arises in sectors where both mechanical stress and thermal exposure are continuous and extreme — such as in refineries, thermal and nuclear power plants, oil and gas transmission systems, chemical processing units, and offshore rigs. These environments demand materials that not only meet structural expectations but also maintain performance over long service lifespans under harsh conditions. ASTM A691 meets these needs by offering a wide range of chromium-molybdenum-based alloy compositions that provide superior resistance to oxidation, corrosion, creep, and thermal fatigue. Unlike seamless or standard welded pipes, ASTM A691 pipes are fabricated using a method that combines heavy-duty steel plates with electric-fusion welding techniques. This process allows the production of large-diameter pipes (typically 16 inches and above), which are difficult to achieve through conventional pipe manufacturing processes. The use of filler metal during welding helps reinforce the joint, making it suitable for the transportation of high-pressure fluids and gases. Another distinguishing feature of ASTM A691 pipes is their classification system, which defines not only the alloy composition (grade) but also the manufacturing and inspection procedures (class). These classes determine whether the pipe is heat-treated, whether radiographic testing of the weld is performed, and whether a hydrostatic pressure test is conducted. The standard allows for various combinations of normalization, tempering, quenching, and post-weld heat treatments to achieve desired mechanical properties and code compliance, especially for use in environments governed by ASME Boiler and Pressure Vessel Codes. Over the years, ASTM A691 has become a go-to specification for engineers and project managers looking to balance reliability, performance, and cost-effectiveness in high-stakes industrial applications. With its robust mechanical properties, wide grade range, and flexible manufacturing options, ASTM A691 stands as a critical component in modern infrastructure for energy, process, and utility systems. A691 Material Specification Grade Alloy Steel ASTM A691 Cl22, A691 GRADE 1 CR, GRADE 1/2 CR, GRADE 1 1/4 CR, GRADE 2 1/4 CR,GRADE 3 CR, GRADE 5 CR, GRADE 9 CR, GRADE 91, CM 65, CM 70, CM 75 Size 1/2” NB to 36” NB Thickness 3-12mm Schedules SCH5, SCH10, SCH10S, SCH20, SCH30, SCH40, SCH40S, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS Class Designation Class 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 34, 40, 41, 42, 43, 50,51, 52, 53, 60, 61, 62, 63, 70, 71, 72, 73 ASTM A691 Grades ASTM A691 Gr 11, ASTM A691 Gr.91, ASTM A691 9cr, ASTM A691 5cr, ASTM A691 1 1/4cr Cl22, ASTM A691m,ASTM A691 Gr.5cr Cl22, ASTM A691 Cm70, ASTM A691 Class 22, ASTM A691 Class 42, ASTM A691-91, ASTM A691 Grade 2.1/4cr, ASTM A691 11/4cr Cl22 Origin European, Japanese, Korean, US, Russian, Indian (Strictly No Chinese Material) Tolerance Cold drawn pipe: +/-0.1mm Cold rolled pipe: +/-0.05mm Craft Cold rolled and Cold drawn Type Seamless / ERW / Welded / Fabricated / LSAW Pipes available in Form of Round, Square, Rectangular, Hydraulic Etc. Length StandardDouble &In Cut length also. End Plain End, Beveled End, Treaded Specialized in Large Diameter ASTM A691 Pipe Additional Testing NACE MR 0175, NACE TM0177, NACE TM0284, HIC TEST, SSC TEST, H2 SERVICE, IBR, etc. Application Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service ASTM A691 Pipe chemical composition Chemical Composition of A691 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91 Alloy STEEL EFW PIPEs   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 *Grade 91 also includes restrictions on Nickel 0.40 max, Columbium 0.06-0.10, Nitrogen 0.030-0.070, Aluminium 0.02 max, titanium 0.01 max, Zirconium 0.01 max. ASTM A691 Pipe equivalent Pipe Grade Type of Steel ASTM Specification HB, max Number Grade CM-65 carbon-molybdenum steel A204/A204M A 201 CM-70 carbon-molybdenum steel A204/A204M B 201 CM-75 carbon-molybdenum steel A204/A204M C 201 CMSH-70 carbon-manganese-silicon steel, normalized A537/A537M 1   CMS-75 carbon-manganese-silicon steel A299/A299M — — CMSH-80 carbon-manganese-silicon steel, quenched and tempered A537/A537M 2   1/2 CR 1/2 % chromium, 1/2 % molybdenum steel A387/A387M 2 201 1 CR 1 % chromium, 1/2 % molybdenum steel A387/A387M 12 201 1 1/4 CR 1 1/4 % chromium, 1/2 % molybdenum steel A387/A387M 11 201 2 1/4 CR 2 1/4 % chromium, 1 % molybdenum steel A387/A387M 22 201 3 CR 3 % chromium, 1 % molybdenum steel A387/A387M 21 201 5 CR 5 % chromium, 1/2 % molybdenum steel A387/A387M 5 225 9 CR 9 % chromium, 1 % molybdenum steel A387/A387M 9 241 91 9 % chromium, 1 % molybdenum, vanadium, columbium A387/A387M 91 241 A Class I is Other Than Killed with a specified minimum tensile strength of 450 MPa or lower. Class II is Other Than Killed with a specified minimum tensile strength of 450 to 520 MPa incl. Class III is Killed with a specified minimum tensile strength of 450 MPa or lower. Class IV is Killed with a specified minimum tensile strength of 450 to 520 MPa incl. Class V is Killed with a specified minimum tensile strength of over 520 MPa to but not including 655 MPa. Class VI is Killed with a specified minimum tensile strength of 655 MPa or over. B Full size (10 by 10 mm) specimens. C Testing temperature as specified in the purchase order, but no higher than 0°C ASTM A691 Pipe mechanical properties A691 1-1/4CR, 2-1/4CR, 5CR, 9CR, 91 Alloy Steel EFW LSAW Pipes Class

ASTM A671 Pipe Supplier ASTM A671 Steel Pipes step in as a dependable solution engineered to perform in challenging environments. At Prosaic Steel and Alloys, we understand that quality, consistency, and delivery timelines can make or break a project. That’s why we specialize in the manufacturing, fabrication, import, and supply of A671 CC60, CC65, and CC70 Electric Fusion Welded (EFW) Pipes—serving both domestic and global clients with the same precision and professionalism. With years of experience in handling carbon steel piping solutions, we have built a reputation as one of India’s largest stockholders and premier suppliers of ASTM A671 Pipes. Our inventory includes a comprehensive range of A671 LSAW (Longitudinal Submerged Arc Welded) Pipes, available in custom sizes, wall thicknesses, and pressure ratings—ensuring suitability for everything from low-temperature fluid transportation to high-pressure pipelines in thermal plants and chemical facilities.   What makes ASTM A671 Pipes particularly useful is their origin: these pipes are manufactured using pressure vessel quality plates—the same high-grade steel plates used in making industrial boilers and vessels. The electric fusion welding process adds strength, while the optional heat treatment helps achieve specific mechanical properties. These pipes are not only durable and dimensionally accurate but also capable of withstanding stress in extreme conditions, whether it’s sub-zero temperatures or aggressive chemical exposure.   At Prosaic Steel and Alloys, we don’t just sell steel—we provide performance-driven piping solutions tailored to your technical and operational needs. Whether you need a small batch for replacement parts or bulk procurement for large infrastructure projects, our team ensures quick turnaround, global shipping, and compliance with ASTM and ASME standards.   ASTM A671 Carbon Steel Pipes step in as a dependable solution engineered to perform in challenging environments. At Prosaic Steel and Alloys, we understand that quality, consistency, and delivery timelines can make or break a project. That’s why we specialize in the manufacturing, fabrication, import, and supply of A671 CC60, CC65, and CC70 Electric Fusion Welded (EFW) Pipes—serving both domestic and global clients with the same precision and professionalism. With years of experience in handling carbon steel piping solutions, we have built a reputation as one of India’s largest stockholders and premier suppliers of ASTM A671 Pipes. Our inventory includes a comprehensive range of A671 LSAW (Longitudinal Submerged Arc Welded) Pipes, available in custom sizes, wall thicknesses, and pressure ratings—ensuring suitability for everything from low-temperature fluid transportation to high-pressure pipelines in thermal plants and chemical facilities.   What makes ASTM A671 Pipes particularly useful is their origin: these pipes are manufactured using pressure vessel quality plates—the same high-grade steel plates used in making industrial boilers and vessels. The electric fusion welding process adds strength, while the optional heat treatment helps achieve specific mechanical properties. These pipes are not only durable and dimensionally accurate but also capable of withstanding stress in extreme conditions, whether it’s sub-zero temperatures or aggressive chemical exposure.   ASTM A671 Pipe Specification ASTM A671 Pipe Specification ASTM A671 /ASME SA671 Grades ASTM A671 Grade CC60 ASTM A671 Grade CC65 ASTM A671 Grade CC70 Type EFW (ELECTRIC FUSION WELDED PIPES) Class Designation CLASS 10, 11, 12, 13, 20, 21, 22, 23, 30, 31, 32, 33, 40, 41, 42 Outer Diameter Size 16″ NB To 100″ NB (Nominal Bore Size) Wall Thickness Schedule 20 To Schedule XXS (Heavier On Request) Up to 250 mm Thickness ASTM A671 EFW Pipes Length 5 To 7 Meters, 09 To 13 Meters, Single Random Length, Double Random Length And Customize Size. Ends Plain Ends / Beveled Ends / Coupling Delivery Conditions As Rolled, Normalizing Rolled, Thermomechanical Rolled / Formed, Normalizing Formed,Normalized and Tempered / Quenched and Tempered – BR / N / Q /T Coating Epoxy Coating / Colour Paint Coating / 3LPE Coating. Other Testing NACE MR0175, NACE TM0177, NACE TM0284, CHARPY V-NOTCH TEST, RADIOGRAPHIC EXAMINATION,XRAY, ULTRASONIC EXAMINATION, LIQUID PENETRANT, MAGNETIC PARTICLE, HIC TEST, SSC TEST, SWC, H2 SERVICE, IBR, PWHT etc. Dimension All Pipes Is suppliers and Inspected / Tested to the Relevant standards including ASTM, ASME, API. Value Added Services Draw / Expansion / Machining / Sand Blasting / Shot Blasting / Galavanizing / Heat Treatment Packaging Loose / Bundle / Wooden Pallet / Wooden Box / Plastic Cloth Wraps / Plastic End Caps / Beveled Protector 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 / 45 Feet Container / High Cube Container /Open Top Container, By Air – Freighter Civil Passenger and Cargo Planes Material Test Certificate suppliers 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 A671 Pipe Equivalent ASTM A671 EFW Pipes Types Out diameter Wall thickness Length ASTM A671 EFW Pipes (Custom Sizes) 1/2″ NB – 60″ NB SCH 5 / SCH 10 / SCH 40 / SCH 80 / SCH 160 Custom ASTM A671 Welded Pipes (in Stock + Custom Sizes) 1/2″ NB – 24″ NB As per requirement Custom ASTM A671 ERW Pipe (Custom Sizes) 1/2″ NB – 24″ NB As per requirement Custom ASTM A671 SAW Pipe 16″ NB – 100″ NB As per requirement Custom ASTM A671 Pipe / Tube Size Chart ASTM A671 EFW Pipes NB Sizes Sch 5 Sch 10 Sch 40 Sch 80 Sch 160 ASTM A671 1/2           ASTM A671 3/4           ASTM A671 1           ASTM A671 1.25           ASTM A671 1.5           ASTM A671 2           ASTM A671 2.5           ASTM A671 3           ASTM A671 3.5           ASTM A671 4           ASTM A671 5           ASTM A671 6           ASTM A671 8