🟧 Product Overview
ASTM A387 is a chromium‑molybdenum alloy steel designed for pressure vessels and welded structures operating at elevated temperatures. Its Cr‑Mo composition provides excellent resistance to heat, oxidation, and creep, making it a preferred material for petrochemical, refinery, and power generation industries.
A387 includes Grades 5, 9, 11, 12, 22, and 91, each offering different alloy levels and temperature performance. Grade 11 and Grade 22 are the most widely used for high‑temperature pressure vessels.
🟧 Standards
ASTM A387 – Pressure Vessel Plates, Alloy Steel, Chromium‑Molybdenum
Related Standards: ASTM A533, ASTM A537, EN 10028, JIS G3103, GB Q345R/Q370R
🟧 International Pressure Vessel Steel Standards Comparison Table
Country Standard Common Grades China GB 713 / GB 19189 Q245R, Q345R, Q370R America ASTM A516 / A515 / A537 / A387 / A203 / A204 / A285 / A202 A516 Gr60/70, A515, A537, A387, A203, A204, A285, A202 Germany DIN 17155 HII, 19Mn6 Japan JIS G3103 P235GH, P265GH, P295GH, P355GH France NF A 36‑205 A42CP, A48CP Britain BS 1501 161‑430A/B International (EN) EN 10028 P235GH, P265GH, P355GH
🟧 Available Grades
ASTM A387 Grade 5 (Cr‑Mo)
ASTM A387 Grade 9 (Cr‑Mo)
ASTM A387 Grade 11 (1.25Cr‑0.5Mo)
ASTM A387 Grade 12 (0.5Cr‑0.5Mo)
ASTM A387 Grade 22 (2.25Cr‑1Mo)
ASTM A387 Grade 91 (9Cr‑1Mo‑V‑Nb)
🟧 Product Specifications & Available Sizes
Dimensions
Thickness: 3 – 20 mm
Width: 1000 – 2000 mm
Coil ID: 508 mm / 610 mm
Coil OD: 900 – 2000 mm
Coil Weight: 3 – 15 MT
Regular Sizes (mm)
Size Size 3.0 × 1500 × C 5.75 × 1800 × C 3.5 × 1500 × C 5.75 × 2000 × C 3.75 × 1500 × C 7.75 × 2000 × C 4.5 × 1500 × C 7.5–11.75 × 1500 × C
🟧 Chemical Composition (ASTM A387 Grade 11 – typical)
Element Max (%) C 0.15 Mn 0.40–0.65 P 0.025 S 0.025 Si 0.50 Cr 1.00–1.50 Mo 0.45–0.65
🟧 Mechanical Properties (ASTM A387 Grade 11 – typical)
Property Value Yield Strength ≥ 275 MPa Tensile Strength 485–620 MPa Elongation ≥ 18% High‑Temperature Strength Excellent (Cr‑Mo alloy) Creep Resistance High
🟧 Physical Properties
Density: 7.85 g/cm³
Modulus of elasticity: 200 GPa
Thermal expansion: 12×10⁻⁶ /K
🟧 Manufacturing Processes
Hot rolling
Normalizing
Quenching & tempering (for higher grades)
Pickling
Leveling
Slitting / Cutting to length
Surface oiling
🟧 Primary Industry Usage
Petrochemical reactors
Refinery heaters and pressure vessels
Power plant boilers and superheaters
High‑temperature industrial pressure systems
Heat exchangers
High‑pressure welded structures
🟧 Why Use ASTM A387 Pressure Vessel Steel Coil
Chromium‑molybdenum alloy for elevated‑temperature service
Excellent creep resistance and oxidation resistance
Suitable for high‑pressure and high‑temperature environments
Multiple grades for different temperature and strength requirements
🟧 Why Choose WelSteels
Full range of Cr‑Mo pressure vessel steel coils
Consistent dimensional accuracy
Custom coil cutting and slitting
SGS / BV inspection available
Export‑grade seaworthy packaging
Reliable delivery for global projects
