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Home > Our Products > Boiler & Pressure Vessel Steel Plates > Grade / Specification > ASTM A387 Gr 11 / Gr 22 Chrome Moly Plates
Hindustan Steel Corporation supplies ASTM A387 Grade 11 and Grade 22 Chrome Moly alloy steel plates, engineered specifically for high-temperature pressure vessel and boiler applications. These plates offer excellent creep resistance, thermal stability, and oxidation resistance due to their Chromium-Molybdenum composition.
Available in Class 1 and Class 2, these plates meet ASME standards and are widely used in oil refineries, thermal power plants, petrochemical units, and pressure equipment that operate above 500°C. With stock in normalized and tempered conditions, we deliver material that performs under stress — thermally, mechanically, and chemically.
ASTM A387 is a specification for chromium-molybdenum alloy steel plates intended for welded boilers and pressure vessels designed for elevated temperature service. The Gr 11 and Gr 22 variants differ in chromium and molybdenum content, affecting their strength and corrosion resistance.
These plates are ideal for welded pressure equipment subjected to heat, corrosion, and internal pressure.
Chrome Moly plates are essential in equipment where long-term heat exposure and internal pressure are unavoidable. Common applications include:
A387 Gr 11/22 plates resist oxidation, sulfidation, and thermal fatigue in continuous service.
| Property | A387 Gr 11 Cl 2 | A387 Gr 22 Cl 2 |
|---|---|---|
| Yield Strength (min) | 275 MPa | 310 MPa |
| Tensile Strength | 485–620 MPa | 585–760 MPa |
| Elongation (%) | Min 19–22% | Min 17–20% |
| Impact Resistance (Charpy) | Improved in Class 2 | Higher in Class 2 |
| Service Temperature | Up to ~550°C | Up to ~600–650°C |
Both grades offer excellent thermal performance, dimensional stability, and creep strength under prolonged stress cycles.
ASTM A387 Gr 11 and Gr 22 are globally recognized alloy steel plate grades for elevated-temperature service. They conform to ASME SA387 as their code-compliant counterpart and align with several international equivalents.
| Standard | Equivalent Material |
|---|---|
| ASME | SA387 Gr 11 Cl 2 / SA387 Gr 22 Cl 2 |
| EN (Europe) | 13CrMo4-5 (Gr 11), 10CrMo9-10 (Gr 22) |
| DIN (Germany) | 1.7335 (Gr 11), 1.7380 (Gr 22) |
| BS (UK) | 620B (Gr 11), 621B (Gr 22) |
| IS (India) | IS 2041 equivalent alloy steel (approx.) |
We offer Class 2 variants with enhanced tensile strength and 3.1/3.2 certified plates for both domestic and international EPC projects.
Hindustan Steel Corporation maintains a comprehensive inventory of A387 Gr 11 and Gr 22 plates across popular size ranges. We also cater to custom cut-to-length and CNC profile requests.
Available Range:
Plates are available with UT testing, edge prep, hardness reports, and cut markings based on your vessel drawing or engineering plan.
A387 Gr 11 and Gr 22 plates are supplied in the following heat-treated conditions:
These plates are designed to retain mechanical integrity at 500–650°C, making them ideal for steam, hydrogen, and furnace environments.
Chrome Moly plates offer reliable workability when correct welding procedures are followed. Here’s what fabricators should know:
We supply bevelled, edge-prepped, UT-tested plates that reduce fabrication errors and meet ASME Sec VIII Div 1/2 compliance.
We’re more than a stockist — we’re your engineering-aligned steel solutions partner.
Looking for similar or higher-performance materials? We also offer:
Need advice on grade selection? Our metallurgical team can suggest the best alloy configuration based on service conditions.
Hindustan Steel Corporation is a trusted exporter of ASTM A387 Gr 11 and Gr 22 Chrome Moly plates to global pressure vessel manufacturers, EPCs, and petrochemical plants.
Major Export Markets:
Packing Details:
We ensure export compliance, seaworthy delivery, and zero damage in transit — from mill to fabrication yard.
Choosing between Gr 11 and Gr 22 depends on service temperature, design life, and corrosion factors.
| Selection Criteria | Recommendation |
|---|---|
| Moderate heat (up to ~540°C) | Gr 11 Class 2 |
| Higher thermal exposure (up to ~600°C) | Gr 22 Class 2 |
| Enhanced creep strength needed | Gr 22 (2.25% Cr) |
| Cost-effective high-temp alloy | Gr 11 (1.25% Cr) |
| Pressure vessel with PWHT | Gr 11 / Gr 22 Class 2 preferred |
Tip: For oil refineries and steam-based chemical service, Gr 22 Cl 2 offers longer life at slightly higher cost. Always check with your WPS/PQR or process engineer.
Every ASTM A387 Gr 11 / Gr 22 plate is backed by full traceability and international compliance.
Our documentation meets global tender and refinery QA standards.
Gr 22 has higher Chromium (2.25%) and Molybdenum (1%), offering better strength at high temperatures.
It includes 1.25% Chromium and 0.5% Molybdenum with carbon, silicon, manganese, and trace elements.
Typically up to 600–650°C depending on thickness and stress factors.
Class 2 has higher tensile and yield strength and is usually supplied in normalized and tempered condition.
Yes, it is equivalent to DIN 1.7335 (13CrMo4-5).
Yes, with proper preheating and PWHT. Use B2/B3 type low-hydrogen electrodes.
Yes, we offer CE-marked plates for European projects.
Yes, we provide IBR Form III and support Indian boiler compliance.
Absolutely, with UT as per SA578 Level B or C.
Yes, especially when HIC tested and PWHT simulated.
Thickness from 6mm to 100mm; width up to 3000mm; length up to 12 meters.
Depends on grade, size, heat treatment, and certification. Contact us for accurate quote.
Yes, we supply fabrication-ready plates with edge prep and custom shapes.
Ready stock available for dispatch within 48 hours. Custom sizes take 5–7 working days.
Request a Quote or Download A387 Datasheet
Looking for a reliable Chrome Moly plate supplier with engineering know-how and certified stock?
Contact Hindustan Steel Corporation for:
[Download Chrome Moly Datasheet PDF]
+91-22-66159018
+91-9820944724
sales@hindustansteel.com hindustansteel1@gmail.com
390/392, Ground Floor, Shankar Mansion, S.V.P. Road, Mumbai – 400004, India
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