SA387 Grade 22 Class 1 Pressure Vessel Steel Plate
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SA387 Grade 22 Class 1 pressure vessel steel plate/Chrome-Moly Alloy Steel Plate
When selecting materials for high-temperature and high-pressure applications, such as boilers, reactors, or pressure vessels, SA387 Grade 11 chromium-molybdenum alloy steel plates are a popular choice.SA387Gr122CL2 is a high-temperature and high-pressure vessel chrome-moly alloy steel plate that complies with the ASME SA-387/SA-387M - 2019 standard. It is widely used in the manufacturing of boilers and pressure vessels.
1.SA387 Grade 22 Class 1 Key Performance Features
High Temperature Resistance: Suitable for high-temperature and high-pressure environments, such as boilers and heat exchangers.
Impact Resistance: Maintains good impact toughness even at -30°C, with Charpy impact energy J ≥ 54 (average), ≥ 47 (single value).
Cold Bending Performance: Can withstand 180° cold bending without cracking, ensuring excellent processability.
2.SA387 Grade 22 Class 1 Hot Rolled Steel Plate Available Specifications
Thickness: 6 mm ~ 150 mm
Width: Customizable (Common range: 1500 mm ~ 4000 mm)
Length: Customizable (Common range: 3000 mm ~ 18000 mm)
3. SA387Gr122CL2 Plate Application Fields
SA387Gr122CL2 steel plates are widely used in the following industries and equipment manufacturing:
Petrochemical Industry: Reactors, heat exchangers, separators, pressure vessels, etc.
Power Plants: Boilers, steam drums, high-pressure pipelines.
Storage Tank Systems: Spherical tanks, oil and gas storage tanks, LPG tanks, liquefied petroleum gas cylinders.
Nuclear & Hydropower: Nuclear reactor pressure shells, high-pressure water pipes, turbine casings.
4. SA387Gr122CL2 Delivery Conditions
Normalized (N): Improves toughness and enhances mechanical properties.
Tempered (T): Reduces residual stress and improves ductility.
Controlled Rolling (CR): Optimizes microstructure for improved uniformity.
Ultrasonic Testing: Can be supplied according to ASTM A578 Level 1/2/3 ultrasonic inspection standards.
5.Differences between SA387 Grade 11 Class 1 (Cl1) and Class 2 (Cl2)
1. Chemical Composition: SA387 Gr11 Cl1 vs Cl2
Both classes of SA387 Grade 11 share a similar base composition of chromium (Cr) and molybdenum (Mo), but subtle variations exist:
| Element | SA387 Gr11 Cl1 | SA387 Gr11 Cl2 |
|---|---|---|
| Carbon (C) | 0.05–0.17% | 0.05–0.17% |
| Manganese (Mn) | 0.40–0.65% | 0.40–0.65% |
| Chromium (Cr) | 1.00–1.50% | 1.00–1.50% |
| Molybdenum (Mo) | 0.45–0.65% | 0.45–0.65% |
| Phosphorus (P) | ≤0.025% | ≤0.025% |
| Sulfur (S) | ≤0.025% | ≤0.025% |
Key Takeaway: The chemical compositions of Cl1 and Cl2 are identical. The differences lie in heat treatment requirements and mechanical performance.
2. Heat Treatment Requirements
This is where the SA387 Grade 11 Class 1 vs Class 2 distinction becomes significant:
SA387 Gr11 Cl1:
Normalized (N): Heated to approximately 900°C (1650°F) and air-cooled.
Suitable for moderate thicknesses and applications with lower stress demands.
SA387 Gr11 Cl2:
Normalized and Tempered (NT): After normalization, the plate is tempered at 650–750°C (1200–1380°F) to enhance toughness and stress relief.
Mandatory for thicker plates and high-stress environments.
3. Mechanical Properties Comparison
The heat treatment directly impacts mechanical performance:
| Property | SA387 Gr11 Cl1 | SA387 Gr11 Cl2 |
|---|---|---|
| Tensile Strength | 515–690 MPa (75–100 ksi) | 515–690 MPa (75–100 ksi) |
| Yield Strength | ≥310 MPa (≥45 ksi) | ≥310 MPa (≥45 ksi) |
| Elongation (A50) | ≥22% | ≥22% |
| Impact Toughness | - | Higher due to tempering |
Critical Note: While tensile and yield strengths are similar, SA387 Gr11 Cl2 offers superior impact toughness and residual stress resistance, making it ideal for low-temperature or cyclic loading applications.
4. Thickness and Application Scope
SA387 Gr11 Cl1:
Thickness Range: Typically up to 100 mm (4 inches).
Applications: Moderate-pressure vessels, boiler components, and non-critical heat exchangers.
SA387 Gr11 Cl2:
Thickness Range: Up to 150 mm (6 inches) or more.
Applications: High-pressure reactors, thick-walled storage tanks, and critical components in power plants exposed to thermal cycling.
5. Why Choose Class 2 Over Class 1?
The difference between SA387 Grade 11 Class 1 and Class 2 boils down to:
Enhanced Safety: Cl2's tempering reduces brittleness in welded joints.
Thicker Sections: Cl2's heat treatment ensures uniform properties across heavy plates.
Harsh Environments: Cl2 performs better in sub-zero temperatures or fluctuating pressures.
6. FAQs about SA387 Gr11 Cl1
Q: What is the main difference between SA387 Gr11 Cl1 and Cl2?
A: Cl2 undergoes normalizing + tempering for better toughness, while Cl1 is only normalized.
Q: Can SA387 Gr11 Cl1 replace Cl2?
A: No. Cl2 is mandatory for thicker plates (>100mm) or applications requiring Charpy impact testing.
Q: Which class is more cost-effective?
A: Cl1 is cheaper for thin plates, but Cl2's enhanced reliability justifies its cost for critical uses.
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