A Guide to SA 387 GR. 22 CL. 2 Plates

SA 387 Grade 22 Class 2 (SA 387 Gr. 22 Cl. 2) is a premium 2.25Cr-1Mo low-alloy steel plate certified to ASME SA-387/SA-387M and ASTM A387/A387M. Engineered for extreme high-temperature (up to 649°C/1200°F) and high-pressure industrial environments, this quenched-and-tempered (Q&T) material delivers exceptional creep resistance, hydrogen attack protection, and corrosion resistance-making it the material of choice for critical equipment in petrochemical, power generation, and oil & gas sectors.

As a leading supplier of ASME-certified SA 387 Gr. 22 Cl. 2 plates and custom tube shell heat exchangers, GNEE provides a comprehensive guide to help you understand its technical capabilities, key applications, selection criteria, and why it outperforms other steel grades for harsh service conditions.

What are SA 387 GR. 22 CL. 2 Plates?

Alloy steel SA 387 GR. 22 CL 2 is unique steel & produced using Different standards and specifications. Steel makes it possible to fabricate the material into various final goods & final products include plates for industrial boilers, welded boilers, and pressure vessels. The SA 387 GR.22 CL.2 Plates have a chromium concentration of 2.25% and a molybdenum content of 1%. These chromium and molybdenum steel plates work effectively at various temperatures and consistently offer the best performance.

Chemical Composition (Cast Analysis, %)

The 2.25Cr-1Mo alloy composition is the foundation of its extreme performance. Below are the strict limits per ASME SA-387/SA-387M:

Mechanical Properties (Minimum Requirements)

After Q&T heat treatment, SA 387 Gr. 22 Cl. 2 must meet the following mechanical standards:

Applications of SA 387 GR. 22 CL. 2 Plates

It has excellent chemical and mechanical properties & provides greater mechanical strength, yielding strength, and tensile strength. The exceptional and appreciable advantages that SA 387 GR.22 CL.2 PLATES offer make it an excellent choice for various applications and industrial use.

Adding chromium to the alloy enhances its oxidation resistance at elevated temperatures. These plates have good resistance to pitting corrosion and crevice stress cracking corrosion.

This provides strong heat resistance and efficiently prevents the corrosive chemical from dissolving iron, which makes it an excellent choice for gas surroundings & weldability is also good.

It performs efficiently in temperatures up to 600 Deg C and is used for transporting hot liquids.

The material's capacity to withstand corrosion sets it apart from other types of carbon steel. It is often used in pressurized vessels and heat exchangers and is an excellent choice for sour gas environments.

Conclusion

SA 387 Gr. 22 Cl. 2 plates are the ultimate choice for extreme high-temperature, high-pressure, and corrosive industrial environments. Their 2.25Cr-1Mo composition, Q&T heat treatment, and strict ASME certification deliver unmatched reliability for critical equipment like tube shell heat exchangers, petrochemical reactors, and power plant boilers.

By choosing SA 387 Gr. 22 Cl. 2, you minimize downtime, reduce maintenance costs, and ensure operational safety-even in the harshest conditions. For personalized support, custom quotes, or to confirm material suitability for your project, contact GNEE today.

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FAQs About SA 387 Gr. 22 Cl. 2 Plates

Q1: What's the difference between SA 387 Gr. 22 Cl. 1 and Cl. 2?

A: Cl. 2 undergoes quenching + tempering (Q&T) for higher yield strength (345 MPa vs. Cl. 1's 275 MPa), making it suitable for high-pressure critical equipment. Cl. 1 uses normalizing + tempering and is for moderate-pressure applications.

Q2: Can SA 387 Gr. 22 Cl. 2 be used in sour service?

A: Yes-when tested to NACE MR0175/ISO 15156, it resists sulfide stress corrosion cracking (SSCC) in H₂S-containing environments.

Q3: What's the maximum thickness of SA 387 Gr. 22 Cl. 2 plates?

A: GNEE supplies up to 300mm thickness for large pressure vessels and reactors.

Q4: How does SA 387 Gr. 22 compare to 316 stainless steel?

A: 316 stainless steel offers better corrosion resistance to acids/chlorides but lower creep strength at 600+°C. SA 387 Gr. 22 Cl. 2 is more cost-effective for high-temperature/high-pressure applications without extreme chemical corrosion.

GNEE Steel also supplies a variety of boilers and pressure vessel steel plates, such as A204 Grade B,A515 Grade 70,A537 Class 1,SA387 Grade 11 Class 1,P265GH,S537 Class 2,P355Q,P275N,P355N,P690Q,Q345R, etc. If you want to know more about other types of steel plates, you can call the consultation hotline at +8615824687445 or send an email to alloy@gneesteelgroup.com. You are welcome to consult us, and we are very willing to answer your questions.