High-strength Seamless Alloy Tubes Ideal For Superheaters, Reheaters, And High-pressure Steam Boiler Systems.
Astm a213 t91 seamless alloy steel tubes are designed for high-temperature boiler systems, delivering superior creep resistance and long-term durability.
High-strength Seamless Alloy Tubes Ideal For Superheaters, Reheaters, And High-pressure Steam Boiler Systems.
Astm a213 t91 seamless alloy steel tubes are designed for high-temperature boiler systems, delivering superior creep resistance and long-term durability.
ASTM A213 T91 Alloy Steel Seamless Tubes are ferritic alloy steel tubes designed for high-temperature service in superheaters, reheaters, and steam boiler systems. These seamless tubes offer excellent mechanical strength, thermal stability, and oxidation resistance, making them ideal for critical applications in power generation and industrial process plants.
With a chemical composition rich in Chromium (Cr 8.0–9.5%) and Molybdenum (Mo 0.85–1.05%), T91 alloy tubes provide superior high-temperature creep strength and stress rupture resistance. The addition of Vanadium, Niobium, and Nitrogen further enhances microstructural stability, allowing these tubes to operate reliably at service temperatures up to 620°C.
All ASTM A213 T91 seamless tubes are produced using high-quality hot-finished or cold-drawn methods, followed by a strict heat treatment process of normalizing (1040–1080°C) and tempering (730–800°C). This ensures optimized grain structure and consistent mechanical properties, reducing the risk of cracking, oxidation, or thermal distortion in service.
The tubes conform to ASME SA213 and ASTM A213 specifications and are thoroughly tested for tensile strength, elongation, hardness, flattening, and hydrostatic integrity. They are widely used in ultra-supercritical and supercritical boiler units, HRSGs (Heat Recovery Steam Generators), nuclear thermal plants, and petrochemical facilities requiring extended service life under extreme conditions.
Available in OD sizes from 1/2" to 5", wall thicknesses from SCH 40 to SCH 160, and lengths up to 12 meters, T91 alloy tubes are delivered in plain, beveled, or threaded ends with optional 3LPE/FBE coating or black painting for corrosion protection.
T91 has higher chromium (8.0–9.5% vs. 1.0–1.5%), higher molybdenum (0.85–1.05% vs. 0.44–0.65%), and includes vanadium and niobium for superior creep strength. T91 supports higher temperatures (up to 650°C vs. 560°C) and has higher strength (585/415 MPa vs. 415/205 MPa).
T91 has higher chromium (8.0–9.5% vs. 0.8–1.25%), higher molybdenum (0.85–1.05% vs. 0.44–0.65%), and includes vanadium and niobium, offering better corrosion and creep resistance. T91 is suited for ultra-supercritical boilers (up to 650°C vs. 550°C) with higher strength (585/415 MPa vs. 415/220 MPa).
T91 has higher chromium (8.0–9.5% vs. 1.9–2.6%) and similar molybdenum (0.85–1.05% vs. 0.87–1.13%) but includes vanadium and niobium for enhanced creep resistance. T91 supports higher temperatures (650°C vs. 593°C) and has higher strength (585/415 MPa vs. 415/205 MPa).
T91 has similar chromium (8.0–9.5% vs. 8.0–10.0%) and molybdenum (0.85–1.05% vs. 0.9–1.1%) but includes vanadium and niobium for superior creep resistance. T91 has higher strength (585/415 MPa vs. 415/205 MPa) and is suited for ultra-supercritical boilers (up to 650°C vs. 620°C).
T92 is an enhanced version of T91, with added tungsten (1.5–2.0%) and boron (0.001–0.006%) for improved creep strength, but similar chromium (8.5–9.5% vs. 8.0–9.5%) and slightly higher strength (620/440 MPa vs. 585/415 MPa). Both are used in ultra-supercritical boilers (up to 650°C).
T91 has higher chromium (8.0–9.5% vs. 2.2–2.6%) but similar vanadium and niobium, while T24 includes titanium and boron. T91 is suited for ultra-supercritical boilers (up to 650°C vs. 600°C) with similar strength (585/415 MPa).
T91 (ASTM A213) is a seamless tube for heat transfer components (thinner walls, OD 1/8” to 5”), while P91 (ASTM A335) is a pipe for structural and pressure piping (OD 1/8” to 48”). Both share the same 9Cr–1Mo–V–Nb chemistry but are used in different applications.
The ASTM A213 T91 Alloy Steel Seamless Tube addresses critical challenges like corrosion, creep, and thermal stress in high-throughput industrial systems. Its advanced chrome-moly alloy composition and seamless construction make it a premium choice for engineers seeking durable boiler tubes and heat exchanger tubes for extreme environments.
Dimensions and performance data for ASTM A213 T91 Alloy Steel Seamless Tubes
| Element | 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) | 0.03-0.07 |
| Property | Value |
|---|---|
| Tensile Strength, min (MPa) | 585 |
| Yield Strength, min (MPa) | 415 |
| Elongation, min (%) | 20 (Longitudinal) |
| Hardness, max (HB) | 217 |
| Parameter | Range | Standard |
|---|---|---|
| Inside Diameter | 1/8" to 5" | 3.2 mm to 127 mm |
| Wall Thickness | 0.015" to 0.500" | 0.4 mm to 12.7 mm |
| Length | 5–7 m / 9–13 m | SRL / DRL |
| Schedule | 40 to 160 | STD, XS, XXS |
| Property | Value | Unit |
|---|---|---|
| Max Service Temperature | 650 | °C |
| Tensile Strength | 415–690 | MPa |
| Yield Strength | 205–520 | MPa |
| Elongation | 20–30 | % |
Key advantages that make ASTM A213 alloy tubes a preferred choice in high-temperature and corrosive environments.
Maintains structural integrity under extreme heat, ideal for boilers, heat exchangers, and superheaters.
Chromium and molybdenum ensure excellent resistance to oxidation and chemical attack in aggressive media.
Offers high tensile and yield strength, ensuring safe performance under high pressure and temperature.
Durable construction and corrosion resistance extend operational life and minimize maintenance downtime.
Precision manufacturing ensures uniform wall thickness and surface finish, optimizing heat transfer and fit.
Widely used in power generation, petrochemical, and thermal processing industries due to its performance and reliability.
ASTM A213 T91 Alloy Steel Seamless Tubes are widely used in various industries due to their excellent high-temperature and high-pressure performance.
Utilized in boilers, superheaters, and reheaters within steam power plants due to their high-temperature resistance and durability.
Employed in refineries and chemical plants for transporting high-temperature fluids and gases, ensuring safety and efficiency.
Ideal for use in heat exchangers where thermal stability and corrosion resistance are critical under fluctuating temperatures.
Commonly used in high-pressure boilers and superheaters, offering excellent performance under extreme thermal conditions.
Applied in the extraction and processing of oil and gas, handling high-pressure and high-temperature fluids effectively.
Suitable for equipment in chemical industries where resistance to corrosive substances and high temperatures is essential.
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