ASME SA387 Gr.12 Cl.2 Alloy Steel Plates Premium Strength For High Pressure Vessel Boiler Construction

SA387 Gr12 Cl2 Chromium-Molybdenum Alloy Steel Plate

For High-Temperature Pressure Vessels & Hydrogen Service

1. Introduction

SA387 Gr12 Cl2 is a low-alloy chromium-molybdenum steel plate standardized under ASTM/ASME SA387, designed for welded pressure vessels operating at elevated temperatures (up to 538°C / 1000°F). Supplied in Normalized and Tempered (N+T) condition (Class 2), it delivers superior creep strength, hydrogen resistance, and weldability for critical petrochemical, power, and oil/gas applications.

2. Chemical Composition (Weight %)

Note: Strict control of P+S ≤ 0.035% minimizes hot cracking.

3. Mechanical Properties

4. Product Standards & Certifications

• Primary Standard: ASTM SA387 / ASME SA387

• Delivery Condition: Class 2 (Normalized + Tempered)

• Testing Compliance:

  • Tensile/Yield/Elongation: ASTM A370

  • Impact Test: ASTM A20 / ASTM E23

  • Ultrasonic Testing: ASTM A435 (Optional Level B)

• Certificates:

  • EN 10204 3.1/3.2 Mill Test Report (MTR)

  • NACE MR0175 / ISO 15156 (Sour Service)

  • PED 2014/68/EU Annex I (CE Mark)

  • Material Traceability (Heat No., Melt Analysis)

5. Specification & Dimensions

6. Equivalent Grades

7. Applications

• Petrochemical:

  • Hydrocracker reactors, hydrogenation vessels

  • Catalytic reforming units, amine contactors

• Power Generation:

  • Boiler drums (≤550°C), steam headers

  • Superheater supports, turbine casings

• Oil & Gas:

  • Sour gas separators (NACE-compliant)

  • LNG heat exchanger shells

• General Industry:

  • High-temperature storage tanks

  • Process piping & heat recovery systems