Alloy Steel Plates Inventory | SA 387 Gr 11, Gr 22, Gr 91 | Pannani Tubes

Alloy Steel Plates

Premium Chrome-Moly (Cr-Mo) Plates for Elevated Temperatures.
ASTM A387 / ASME SA 387. 100% UT & IBR Tested.

Chrome-Moly Grades (SA 387)

SA 387 Gr 11 Plate
1.25% Cr, 0.5% Mo

SA 387 Grade 11 (Cl 2)

Standard alloy steel plate widely used in welded boilers and pressure vessels operating at elevated temperatures. Excellent oxidation resistance.

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SA 387 Gr 22 Plate
2.25% Cr, 1.0% Mo

SA 387 Grade 22 (Cl 2)

Higher chromium and molybdenum content provides enhanced heat resistance and creep strength. Critical for petrochemical and oil & gas refineries.

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SA 387 Gr 5 Plate
5.0% Cr, 0.5% Mo

SA 387 Grade 5 (Cl 2)

5% Chromium content offers significantly better corrosion and oxidation resistance over Gr 11/22. Used heavily in sour gas environments.

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SA 387 Gr 9 Plate
9.0% Cr, 1.0% Mo

SA 387 Grade 9 (Cl 2)

High alloy steel plate offering exceptional resistance to high-temperature hydrogen attack. Preferred for severe process heating equipment.

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SA 387 Gr 91 Plate
9Cr-1Mo-V

SA 387 Grade 91

Modified 9Cr-1Mo steel alloyed with Vanadium and Niobium. Engineered specifically for supercritical and ultra-supercritical power plants.

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Alloy Plate Cutting
CNC Machining

Custom Alloy Profiles

We provide precision CNC plasma and waterjet cutting for thick alloy plates. Supply of tube sheets, baffle plates, and rings with MTC.

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Mechanical Properties

Typical properties for ASME SA 387 / ASTM A387 Class 2 Plates.

Grade Nominal Composition Min. Yield Strength (MPa) Tensile Strength (MPa) Max Temp Service
Grade 11 (Class 2) 1.25% Cr, 0.5% Mo 310 515 - 690 Up to 593°C
Grade 22 (Class 2) 2.25% Cr, 1.0% Mo 310 515 - 690 Up to 600°C
Grade 5 (Class 2) 5.0% Cr, 0.5% Mo 310 515 - 690 Up to 650°C
Grade 9 (Class 2) 9.0% Cr, 1.0% Mo 415 585 - 760 Up to 650°C
Grade 91 9% Cr, 1% Mo, V, Nb 415 585 - 760 Up to 600°C (Extreme Stress)

Quality & Capabilities

IBR Form IV

Because these plates are used in boilers, we supply 100% IBR certified plates approved by the Chief Inspector of Boilers.

Ultrasonic Test (UT)

Plates are tested as per ASTM A435 or A578 to guarantee freedom from laminations and inclusions.

Thickness Range

Stocking thickness from 6.0 mm to 100 mm+. Widths up to 2500 mm available for immediate dispatch.

Plant Turnaround or Maintenance?

We understand the urgency of refinery shut-downs. Contact us for express delivery of Alloy Steel Plates.

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