Alloy Steel Plates Specifications
The specifications of alloy steel plates, including standards, dimensions, forms, finishes, and more, are provided in the table below.
| Parameter | Specification / Range |
|---|---|
| Common Grades | ASTM A387 (Gr 11, 22, 5, 9, 91), ASTM A517 |
| Standards | ASTM A387 / ASME SA-387, ASTM A517 |
| Thickness Range | 5 mm to 150 mm (can go higher on request) |
| Width Range | 1000 mm to 3500 mm |
| Length Range | 2000 mm to 12000 mm |
| Form | Hot Rolled (HR) Plates |
| Heat Treatment | Normalized, Quenched & Tempered (Q&T), Annealed |
| Surface Finish | Mill Finish, Shot Blasted, Pickled, Coated |
| Tolerance | As per ASTM A20 / EN standards |
| Edge Condition | Mill Edge / Slit Edge |
| Supply Condition | As Rolled / Heat Treated |
Alloy Steel Plate Sizes
Alloy steel plates are stocked in these size ranges at Sachiya Steel International.
| Parameter | Range |
|---|---|
| Thickness | 3/16" (5 mm) to 8" (200 mm) |
| Width | Up to 96" (2440 mm) |
| Length | Up to 480" (12,000 mm) |
| Stock Sizes | 1'x1', 2'x4', 4'x8', 5'x10' |
| Custom Sizes | Available on request |
Alloy Steel Plate Price
Alloy steel plate costs ₹100 to ₹170 per kg in India and $0.75 - $8.50+ per kg in international markets. These prices depend on grade, thickness, and quantity. A387 Gr.22 carries a premium over lower grades. Contact us for current pricing.
Grades of Alloy Steel Plates
Cr-Mo grades serve elevated-temperature pressure vessel applications.
- Grade 5 (5Cr-½Mo): ASTM A387 Grade 5 plates are used in oil refinery reactors and hydrogen service equipment.
- Grade 9 (9Cr-1Mo): ASTM A387 Grade 9 plates are used in petrochemical reactors and superheaters for oxidation resistance.
- Grade 11 (1¼Cr-½Mo): ASTM A387 Grade 11 plate (Class 1 and Class 2) serves petroleum refining and moderate-temperature vessels.
- Grade 22 (2¼Cr-1Mo): ASTM A387 Grade 22 plates are used in power boilers and catalytic cracking units.
- ASTM A517 Grade A: used in high-strength structural parts and pressure vessels requiring good toughness at moderate thicknesses.
- ASTM A517 Grade B: used in heavy-duty structural applications and welded pressure vessels where high yield strength is essential.
- ASTM A517 Grade E: used in cranes, lifting equipment, and structural frameworks requiring a high strength-to-weight ratio.
- ASTM A517 Grade F: used in transport equipment and structural components exposed to dynamic loading and impact conditions.
- ASTM A517 Grade H: used in construction equipment and high-stress structural applications demanding superior toughness.
- ASTM A517 Grade P: used in pressure vessels and storage tanks operating under elevated stress conditions.
- ASTM A517 Grade Q: used in high-performance pressure vessels and defence/heavy engineering applications requiring very high yield strength.
- ASTM A517 Grade S: used in structural and pressure applications where a balance of strength, weldability, and toughness is required.
Available Forms of Alloy Steel Plates
Alloy steel plates are supplied in these forms at Sachiya Steel.
- Hot rolled (HR)
- Annealed
- Normalised
- Quenched and tempered (Q&T)
- Stress-relieved conditions.
Available surface finishes include mill finish, shot-blasted, and machined.
Alloy Steel Plate Industrial Applications
Alloy steel plates serve 4 industries that demand high-temperature performance or strength.
Oil & Gas Industry
ASTM A387 Cr-Mo plates serve refinery reactor vessels and hydrogen service equipment.
Power Generation
Boiler drums and superheater headers use Cr-Mo plates for creep resistance above 500°F (260°C).
Petrochemical & Chemical Processing
SA-387 Gr.11 and Gr.22 plates serve reactor vessels and heat exchangers.
Structural & Heavy Equipment
AISI 4140 and 4340 plates serve gears, shafts, and machinery frames.
Alloy Steel Plates vs Carbon Steel Plates
Alloy steel plates outperform carbon steel plates (ASTM A36/A516) in high-temperature strength.
| Property | Alloy Steel (A387) | Carbon Steel (A36/A516) |
|---|---|---|
| Alloying Elements | Cr, Mo, Ni, V | Primarily C, Mn |
| Max Service Temp | Up to 1200°F (650°C) (Gr.91) | Up to 400°F (204°C) |
| Creep Resistance | High | Low |
| Hardenability | Excellent | Limited |
Alloy plates are the right choice when service temperatures exceed 400°F (204°C).
Shipping & Packaging
Heavy-duty wooden boxes Packing
We strictly follow seaworthy export handling standards to protect alloy steel plate 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
- Edge and corner protection with plastic padding
- Silica gel desiccants to minimize moisture exposure
- ISPM-15 fumigated wooden packaging for export
Plate Bundle Yard
Staging
Plate Bundle Edge
Protection
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.
USA
Canada
Germany
UK
Italy
France
Australia
South Korea
Indonesia
Vietnam
Singapore
Malaysia
Taiwan
UAE
Saudi Arabia
Qatar
Oman
South Africa
Nigeria
Egypt