ASME SA387 grade 12 | chromium molybdenum steel | 13crmo44

ASME SA387 Grade 12 is a widely used chromium molybdenum (Cr-Mo) alloy steel plate designed for boilers and pressure vessels operating under elevated temperatures and pressures. Known for its excellent heat resistance, creep strength, and oxidation resistance, SA387 Gr 12 is a preferred material in power generation, petrochemical, oil & gas, and refinery industries.

In international projects, SA387 Grade 12 is often compared or substituted with the European grade 13CrMo44 (EN 10028-2) due to their similar alloy systems and performance characteristics. As a professional pressure vessel steel supplier, GNEE Steel provides SA387 Grade 12 plates with stable quality, full certification, and global delivery capability.

Material Overview and Standards

Standard: ASME SA387 / ASTM A387

Alloy type: Chromium-Molybdenum Steel

Typical condition: Normalized & Tempered (Class 1)

European equivalent: 13CrMo44 (1.7335)

SA387 Grade 12 belongs to the 1Cr–0.5Mo steel family, making it suitable for medium to high temperature service where carbon steel is no longer sufficient.

Chemical Composition of SA387 Grade 12

The chemical composition of ASME SA387 Grade 12 is optimized to provide a balance between strength, toughness, and high-temperature stability.

Typical chemical composition (wt.%):

• Carbon (C): ≤ 0.15
• Silicon (Si): ≤ 0.50
• Manganese (Mn): 0.30 – 0.60
• Chromium (Cr): 0.80 – 1.25
• Molybdenum (Mo): 0.45 – 0.65
• Phosphorus (P): ≤ 0.035
• Sulfur (S): ≤ 0.035

Chromium enhances oxidation and corrosion resistance, while molybdenum significantly improves creep resistance and resistance to hydrogen attack, making the steel reliable for long-term pressure service.

Mechanical Properties and Heat Treatment

ASME SA387 Grade 12 is typically supplied in the normalized and tempered (N+T) condition to ensure uniform microstructure and stable mechanical properties.

Typical mechanical properties:

• Tensile Strength: 415 – 585 MPa
• Yield Strength (min): 205 MPa
• Elongation: ≥ 18%
• Impact testing: Available upon request

This heat-treated condition ensures excellent pressure-bearing capability, toughness, and fabrication reliability, especially for thick plates.

High-Temperature Performance Advantages

Compared with carbon pressure vessel steels, SA387 Grade 12 Cr-Mo steel provides superior performance in elevated temperature environments.

Key advantages include:

Excellent creep strength at high temperatures

Strong oxidation and scaling resistance

Reliable performance in hydrogen-containing environments

Reduced risk of thermal fatigue during cyclic operation

These advantages make SA387 Gr 12 ideal for continuous operation equipment where long-term stability is critical.

Comparison: SA387 Grade 12 vs 13CrMo44

SA387 Grade 12 and 13CrMo44 are often considered equivalent for many applications.

While chemical composition and performance are similar, final substitution should always follow design code approval and project requirements.

Typical Applications of SA387 Grade 12 Steel Plate

ASME SA387 Grade 12 is widely used in:

Power plant boilers and steam drums

Petrochemical and refinery pressure vessels

Heat exchangers and reactor shells

High-temperature separators and headers

Chemical processing equipment

Its reliability under heat and pressure makes it a standard material for ASME-coded pressure equipment.

Why Choose GNEE Steel for SA387 Grade 12

As an experienced pressure vessel steel plate supplier, GNEE Steel offers:

• Compliance with ASME SA387 / ASTM A387
• Plate thickness range: 6mm – 150mm
• EN 10204 3.1 / 3.2 Mill Test Certificates
• Third-party inspection (SGS, BV, TUV)
• Technical support for material selection and equivalency
• Strong export experience to global markets

Conclusion

ASME SA387 Grade 12 chromium molybdenum steel, comparable to 13CrMo44, is a proven material for boilers and pressure vessels operating under elevated temperatures and pressures. Its excellent high-temperature strength, oxidation resistance, and long-term reliability make it a smart choice for demanding industrial applications.

📩 Contact GNEE Steel today for technical consultation, competitive pricing, and reliable supply of SA387 Grade 12 Cr-Mo steel plates for your pressure vessel and boiler projects.

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What is SA 387 GR 12 equivalent material?

SA 387 GR.12 Equivalent Grades :

What is the SA387 standard?

The ASME SA387 standard covers the supply of weldable chrome molybdenum alloy steel plates for pressure vessels used in elevated temperature service. The added molybdenum and chromium provides excellent corrosion resistance and high temperature resistance respectively.

What is SA 387 Grade 11 Class 2 equivalent to?

Sa 387 Gr 11 Equivalent Material is the ASME SA387 in the US markets with the European Union having modules in 13CrMoSi5-5 grade. The Sa 387 Gr 11 Cl 2 Equivalent Material is the SA387-11-2 of the ASME and ASTM standard.

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.