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Home > Products > Industrial Metal Pipe > ASTM A691 Pipes > ASTM A691 GR 91
A691 GR 91, Alloy Steel Pipes, High-Temperature Applications, Corrosion-Resistant Pipes, Pressure Vessel-Grade Pipes, EFW Steel Pipes
Kwality Steelage Pvt. Ltd., a globally acclaimed manufacturer, supplier, and exporter based in Mumbai, India, offers top-quality ASTM A691 GR 91 Alloy Steel Pipes. These pipes are specially engineered to endure extreme temperatures and high-pressure conditions, making them the preferred choice for critical applications in industries such as power generation, oil refineries, petrochemicals, and chemical processing. Fabricated using pressure vessel-grade plates and the Electric Fusion Welding (EFW) process, these pipes deliver outstanding mechanical strength, durability, and corrosion resistance.
ASTM A691 GR 91 pipes are available in nominal bore (NB) sizes ranging from 1/2 inch to 36 inches, with wall thicknesses of up to 75 mm. They are offered in various schedules, including SCH 40, SCH 80, SCH 120, and SCH XXS, catering to diverse industrial requirements. These pipes exhibit a tensile strength of 585–760 MPa and a minimum yield strength of 415 MPa, ensuring reliable performance under demanding conditions.
The material composition of ASTM A691 GR 91 pipes features 9% chromium and 1% molybdenum, which significantly enhance their resistance to creep, oxidation, and thermal stress. Additionally, trace elements like vanadium, niobium, and nitrogen improve mechanical properties, making these pipes ideal for applications requiring superior strength and durability. These pipes are extensively used in power plants, pressure vessels, and high-temperature fluid transportation systems.
Dimensional precision is achieved with tolerances of ±1% for outside diameter and +12.5%/-10% for wall thickness, ensuring compatibility with international standards. End options such as plain, beveled, and threaded ends are available, along with surface treatments like black painting, galvanization, and anti-corrosion coatings. Custom lengths of up to 12 meters can be supplied to meet specific project requirements.
Kwality Steelage Pvt. Ltd. ensures stringent quality assurance through advanced testing techniques, including ultrasonic, radiographic, and hydrostatic examinations. With a strong commitment to quality and timely delivery, the company supplies ASTM A691 GR 91 Alloy Steel Pipes to global markets, including the Middle East, Europe, and Asia. Contact us today to explore our range of high-performance pipes and elevate your industrial projects.
| Specification | Details |
| Size Range | 1/2 to 36 inch NB |
| Wall Thickness Range | SCH 20, SCH 40, SCH 80, SCH 120, SCH 160, XXS |
| Applications | Power Plants, Petrochemicals, Oil Refineries, High-Temperature Fluid Transport |
| Pipe Type | Electric Fusion Welded (EFW) |
| Pipe Form | Round, Square, Rectangular, Hydraulic Pipes |
| Manufacturing Process | Heat-Treated (Normalized, Quenched, Tempered), EFW with Pressure Vessel Grade Plates |
| Material Composition | Alloy Steel with 9% Chromium, 1% Molybdenum, Vanadium, Niobium, and Nitrogen |
| End Type | Plain, Beveled, Threaded |
| Length Options | Single Random, Double Random, Custom Lengths (up to 12 meters) |
| Surface Coating | Anti-Corrosion Coating, Black Painting, Galvanized |
| Tolerance Type | Outside Diameter (OD) | Wall Thickness (WT) |
| Size Tolerance | ±1% of specified OD | +12.5% / -10% of specified WT |
| Grade | Yield Strength (Min) | Tensile Strength (Min) | Elongation (%) |
| 91 | 415 MPa | 585–760 MPa | 18% |
| Element | Maximum % Composition |
| Carbon (C) | 0.08-0.12% |
| Manganese (Mn) | 0.30-0.60% |
| Phosphorus (P) | 0.020% |
| Sulfur (S) | 0.010% |
| Silicon (Si) | 0.20-0.50% |
| Chromium (Cr) | 8.00-9.50% |
| Molybdenum (Mo) | 0.85-1.05% |
| Vanadium (V) | 0.18-0.25% |
| Nitrogen (N) | 0.030-0.070% |
| Niobium (Nb) | 0.06-0.10% |
| Pipe Type | Price Range (USD) |
| ASTM A691 GR 91 Alloy Steel Pipes | $1,000 – $2,200 |
Welding and heat treatment are critical for ASTM A691 GR 91 pipes to achieve the desired mechanical properties. These pipes undergo stress-relieving at 1100-1250°F (590-675°C) and can be normalized at up to 1900°F (1040°C). Quenching and tempering processes are used as required to enhance strength and durability. Post-weld heat treatment (PWHT) is recommended for thicknesses above 12 mm to minimize residual stresses and improve weld integrity.
| Feature | GR 9 CR | GR 91 |
| Chromium Content | 8.00-10.00% | 8.00-9.50% |
| Molybdenum Content | 0.90-1.10% | 0.85-1.05% |
| Vanadium Content | Not Present | 0.18-0.25% |
| Applications | High-Temperature, High Pressure | Extreme-Temperature, Creep Resistance |
Choose Kwality Steelage Pvt. Ltd. for premium ASTM A691 GR 91 Alloy Steel Pipes. Designed for extreme applications, our pipes deliver unmatched quality and durability. Contact us now for custom solutions and global delivery!
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