Trison Overseas LLP
Alloy Steel Grade

Grade P91 Steel Grade Specifications

Grade P91 is a micro-alloyed steel (9% Cr, 1% Mo, V, Nb) providing extreme strength at very high temperatures. Essential for modern ultra-supercritical power plants.

Key Advantages & Characteristics

✓Extremely high creep strength and thermal fatigue threshold
✓Enables thinner wall thickness for high-pressure pipes
✓Excellent resistance to thermal stress cracking
✓Maintains structural strength at operating temps up to 620°C

Chemical Composition

Technical Specifications

Carbon (C)
0.08 - 0.12%
Manganese (Mn)
0.30 - 0.60%
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%
Niobium (Nb)
0.06 - 0.10%

Mechanical Properties

Technical Specifications

Tensile Strength (MPa)
585 min
Yield Strength 0.2% (MPa)
415 min
Elongation (%)
20 min

Available Product Forms in Grade P91

We stock and supply a comprehensive range of Grade P91 structural steel, piping systems, and mechanical components globally.

Grade P91 Pipe

Industrial seamless and welded pipes manufactured to handle severe pressures, fluid flow, and chemical environments. Available in various wall schedules, lengths, and end configurations.

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Grade P91 Tube

Precision instrumentation, heat exchanger, and condenser tubes built for precise dimensional tolerances and structural thermal performance. Features clean finishes and high concentricity.

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Grade P91 Sheet

Premium hot rolled (HR) and cold rolled (CR) steel sheets. Offered in a wide variety of finishes including mirror, hairline, matte, and chequered, matching stringent architectural or industrial needs.

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Grade P91 Plate

Heavy duty thick plate materials engineered for pressure vessel shells, boilers, structural frames, and severe wear environments. Certified to handle high pressure loads and extreme conditions.

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Grade P91 Coil

Sturdy, long strip steel coils in HR (hot rolled) and CR (cold rolled) conditions, optimized for stampings, profile drawings, tube rollings, and slitting distributions.

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Grade P91 Round Bar

Bright and black round bars offering excellent dimensional accuracy, tensile strength, and machinability. Designed for shafts, bolts, gears, and high stress mechanical components.

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Grade P91 Rod

Industrial rod materials and wire rods with reliable mechanical strength, ductile qualities, and chemical uniformity for drawing, forging, and structural operations.

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Grade P91 Wire

Premium metal wires in spool and coil forms, ranging in diameters from fine sizes to heavy wire. Highly uniform, corrosion resistant, and resilient for drawing and weave projects.

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Grade P91 Pipe Fitting

Premium butt-weld and forged pipe fittings including elbows, tees, reducers, unions, and couplings. Precision engineered to form secure, leak-proof transitions in industrial piping systems.

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Grade P91 Flange

Heavy forged flanges including Slip-On, Blind, Weld Neck, Socket Weld, and Threaded configurations. Designed to connect pipes, valves, pumps, and other equipment with secure sealing.

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Grade P91 Fastener

Enterprise grade bolts, studs, heavy hex nuts, washers, and threaded rods. Built to withstand high torque, extreme vibrations, heat, and chemical corrosion in critical joints.

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Grade P91 Wire Mesh

Industrial woven and welded wire mesh screens, optimized for chemical filtering, agricultural separations, architectural screens, and safety barriers.

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Grade P91 Angle

L-shaped structural angles offering high torsional stability, uniform dimensions, and high load capacity for structural framing, brackets, and construction.

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Grade P91 Channel

C-shaped structural channels providing outstanding bending stiffness, load capacity, and durability for columns, support structures, and industrial machinery bases.

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Grade P91 Beam

Heavy structural H-beams and I-beams built to sustain large vertical loads and spans in industrial buildings, bridges, and infrastructure projects.

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