Specifications of ASTM A387 Grade 22 Plate

The specifications of Grade 22 plates, including standards, dimensions, forms, finishes, and more, are listed in the table below.

Parameter Specification
Standard ASTM A387 / ASME SA387
Thickness Range 3/16 inch (4.70 mm) to 4 inches (91.4 mm)
Width Range up to 131.9 inches (3,350 mm)
Length Range up to 590 inches (15,000 mm)
Heat Treatment Normalized & Tempered
Surface Finish Hot Rolled (HR), Shot Blasted, Pickled
Edge Condition Mill Edge / Trimmed Edge
Supply Condition Heat treated (Normalised or Quenched & Tempered as applicable)

Available Sizes and Dimensions

A387 Gr.22 plates are stocked in sizes covering most pressure vessel requirements.

Thickness Range

The thickness range of ASTM A387 Grade 22 plates covers both standard and heavy-duty applications.

Thickness (Inches) Thickness (mm)
3/16" 4.70 mm
Up to 4" 91.4 mm
Above 2" Above 50.8 mm

Width and Length Options

ASTM A387 Grade 22 plates are available in multiple widths and lengths, with options for custom sizes based on project requirements.

Parameter Range (Inches) Range (mm)
Width 60" – 131.9" 1,500 – 3,350 mm
Stock Widths 96", 120" 2,438 mm, 3,048 mm
Length 73" – 590" 1,900 – 15,000 mm

ASTM A387 Gr.22 Plate Price

A387 Gr.22 plates cost ₹98 and ₹200 per kg in India and $1.50 to $3.00 per kg in international markets. The final price depends on class, thickness, dimensions, quantity, and testing requirements (HIC, NACE, UT). Class 2 costs more than Class 1. Request a quote from Sachiya Steel International for current pricing.

Chemical Composition of ASTM A387 Grade 22 Plates

The table below lists the chemical composition per heat and product analysis. Chromium at 2.00 to 2.50% delivers high-temperature oxidation resistance. Molybdenum at 0.90 to 1.10% raises creep-rupture strength. Low carbon supports weldability and reduces the risk of sensitisation during PWHT.

Carbon C
0.05 - 0.15%
Manganese Mn
0.30 - 0.60%
Phosphorus P
0.035% max
Sulfur S
0.035% max
Silicon Si
0.50% max
Chromium Cr
2.00 - 2.50%
Molybdenum Mo
0.90 - 1.10%

Mechanical Properties of ASTM A387 Gr.22 Plates

SA-387 Gr.22 plates are supplied in Class 1 and Class 2. Both share 18% minimum elongation in 2 inches (50 mm).

Class 1 (Normalised and Tempered)

Class 1 plates provide the standard strength level for moderate-pressure service.

60–85
MPa (ksi)
Tensile Strength
30/205
MPa (ksi)
Yield Strength (min)
18
%
Elongation (min)
Property Value
Tensile Strength 60 to 85 ksi (415 to 585 MPa)
Yield Strength, min 30 ksi (205 MPa)
Elongation, min 18%

Class 2 (Quenched and Tempered)

Class 2 is the higher-strength option, more common in oil and gas applications.

75–100
MPa (ksi)
Tensile Strength
45/310
MPa (ksi)
Yield Strength (min)
18
%
Elongation (min)
Property Value
Tensile Strength 75 to 100 ksi (515 to 690 MPa)
Yield Strength, min 45 ksi (310 MPa)
Elongation, min 18%
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ASTM A387 Grade 22 Equivalent Designations

The table below maps international equivalents for A387 Grade 22.

Standard Designation
UNS UNS K21590
EN 10028-2 10CrMo9-10 (W.Nr. 1.7380)
JIS G4109 SCMV 4
GB 713 12Cr2Mo1R

PWHT is typically required after welding.

Industrial Applications of ASTM A387 Gr.22 Plates

A387 Gr.22 chrome moly plates serve industries where high-temperature pressure containment is critical.

Oil, Gas, and Petrochemical Industry

Hydrocracker reactors, hydrotreaters, and hydrogen reformer vessels use A387 Grade 22 Class 2 as shell material. Sour gas (H2S) service may require HIC testing per NACE TM0284.

Power Generation

Boiler drums and superheater headers in thermal power plants rely on the 2.25Cr-1Mo composition for steam oxidation resistance.

Chemical Processing

Heat exchangers and reaction vessels handling corrosive media at high temperatures use these plates.

ASTM A387 Grade 22 vs Grade 11 Plates

This table provides a comparison of Grade 22 and Grade 11 in terms of chemical composition, mechanical properties, and typical application suitability.

Property Grade 22 (Class 2) Grade 11 (Class 2)
Chromium (%) 2.00 – 2.50 1.00 – 1.50
Molybdenum (%) 0.90 – 1.10 0.44 – 0.65
Tensile Strength (ksi) 75 – 100 75 – 100
Yield Strength, min (ksi) 45 45
High Temperature Performance Better above 450°C Suitable for moderate temperatures
Hydrogen Resistance Excellent (preferred in hydrogen-rich environments) Moderate
Cost Consideration Higher More economical
Typical Applications High-temperature pressure vessels, reactors, and petrochemical plants Boilers, pressure vessels at moderate temperatures

Heat Treatment Requirements

A387 Gr.22 plates are supplied thermally treated. The heat treatment cycle determines Class 1 or Class 2 properties.

  • Class 1: Normalising and (tempering optional)
    • Class 1 plates are heated above the upper critical temperature, air-cooled, then tempered at a minimum of 1,250 °F (675 °C). This cycle refines grain structure and improves toughness.
  • Class 2: Quenching and Tempering
    • Class 2 plates are austenitised, water or oil quenched. Then they are tempered at a minimum of 1,250 °F (675 °C). Quenching produces a finer microstructure with higher strength.

Shipping & Packaging

Main export packaging setup Heavy-duty wooden boxes Packing
Export Packaging Standard

We strictly follow seaworthy export handling standards to protect ASTM A387 Gr.22 Plates from transit damage, moisture ingress, and surface contamination during long-distance dispatch.

  • Heavy-duty wooden boxes with moisture barrier lining
  • HDPE stretch film wrapping on all bundles
  • Plastic end caps on threaded and plain-end plate
  • Silica gel desiccants to minimize moisture exposure
  • ISPM-15 fumigated wooden packaging for export
shipping preparation Plate Bundle Yard Staging
Shipping packaging Container End-Cap Protection
Shipping stock Wrapped Export-Ready Bundles

We Export Worldwide

Sachiya Steel International supplies Alloy steel products to major industrial markets across North America, Europe, the Middle East, Asia and Africa with export-ready documentation and logistics support.

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Frequently Asked Questions

What is ASTM A387 Grade 22 Plate?+
ASTM A387 Grade 22 is a 2.25Cr-1Mo alloy steel plate for pressure vessels in elevated-temperature service. They are available in Class 1 and Class 2 per ASTM A387/A387M.
What is the chemical composition of ASTM A387 Gr.22 Plates?+
The primary elements are chromium at 2.00 to 2.50% and molybdenum at 0.90 to 1.10%, with carbon at 0.05 to 0.15% and manganese at 0.30 to 0.60%.
What is the difference between ASTM A387 Gr.22 Class 1 and Class 2?+
Class 1 is normalised and tempered (60 to 85 ksi tensile, 30 ksi yield). Class 2 is quenched and tempered (75 to 100 ksi tensile, 45 ksi yield). Both share 18% minimum elongation.
What is the ASTM A387 Grade 22 equivalent?+
It is equivalent to ASME SA-387 Gr.22, EN 10028-2 10CrMo9-10 (1.7380), JIS G4109 SCMV 4, and GB 713 12Cr2Mo1R.
What are the mechanical properties of ASTM A387 Gr.22 Plates?+
Class 2 provides 75 to 100 ksi tensile and 45 ksi yield minimum. Class 1 provides 60 to 85 ksi tensile and 30 ksi yield.
What is the thickness range of ASTM A387 Gr.22 Plates?+
These plates are available in thicknesses from 3/16 inch (4.70 mm) to 4 inches (91.4 mm).
What are the applications of ASTM A387 Gr.22 Plates?+
They're used in pressure vessels, boilers, heat exchangers, and reactors across oil and gas, petrochemical, power generation, and chemical processing industries.
Where can I buy ASTM A387 Gr.22 Plates?+
Sachiya Steel International stocks A387 Gr.22 in Class 1 and Class 2 with ready inventory and mill test certificates.

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