🟪 Product Overview

Hydrogen‑Resistant Pressure Vessel Steel Plate is engineered for high‑temperature hydrogen service, where conventional pressure vessel steels suffer from:

• Hydrogen embrittlement
• Hydrogen‑induced cracking (HIC)
• High‑temperature hydrogen attack (HTHA)
• Creep deformation

These steels maintain:

• High‑temperature strength
• Excellent resistance to hydrogen attack
• Stable microstructure under hydrogen exposure
• Superior performance in refinery and petrochemical hydrogen units

They are widely used in hydrocrackers, hydrotreaters, hydrogen reactors, high‑temperature pressure vessels, and refinery equipment.

🟪 Product Specifications

• Thickness: 6 – 200 mm
• Width: 1500 – 3000 mm
• Length: Custom lengths available
• Delivery Conditions:
  • Normalized
  • Quenched & Tempered
  • Thermo‑Mechanically Rolled
  • UT Testing (A/B/C/D) available

🟪 Key Features

• High resistance to hydrogen attack (HTHA)
• Excellent performance in high‑temperature hydrogen environments
• Cr‑Mo and Ni‑alloy options for enhanced hydrogen resistance
• Superior creep resistance at 400–600°C
• Stable microstructure under hydrogen exposure
• Suitable for thick‑wall, high‑pressure hydrogen reactors

🟪 Included Grades

ASTM / ASME

• A387 (Grade 5 / 9 / 11 / 12 / 22 / 91) — Cr‑Mo hydrogen‑resistant steel
• A203 (A / B / D / E / F) — Nickel‑alloy hydrogen‑resistant steel
• A202 (A / B) — High‑strength hydrogen service steel
• A537 (Class 1 / 2 / 3) — High‑strength, impact‑tested steel

GB / Chinese Standard

• Q370R — Enhanced hydrogen‑resistant pressure vessel steel
• Q345R (High‑Temperature Hydrogen Service)

EN 10028

• P355GH (High‑Temp Hydrogen Applications)
• P460NH / P460NL

🟪 Mechanical Properties (Typical)

Grade	Yield Strength	Tensile Strength	Hydrogen Resistance	Temperature Range
A387 Gr 11	≥275 MPa	415–585 MPa	High	Up to ~600°C
A387 Gr 22	≥275 MPa	450–620 MPa	Very High	Up to ~600°C
A203 Gr E	≥345 MPa	550–690 MPa	Excellent	Cryogenic–High Temp
A202 Gr B	≥345 MPa	485–620 MPa	High	High Temp
Q370R	≥370 MPa	510–650 MPa	High	High Temp

🟪 Chemical Composition (Typical)

Grade	C (%)	Mn (%)	Si (%)	Cr (%)	Mo (%)	Ni (%)	Notes
A387 Gr 11	≤0.15	0.40–0.65	0.50–1.00	1.00–1.50	0.45–0.65	—	Cr‑Mo hydrogen‑resistant steel
A387 Gr 22	≤0.15	0.40–0.65	0.50–1.00	2.00–2.50	0.90–1.10	—	High‑temp hydrogen service
A203 Gr E	≤0.17	0.70–1.00	≤0.35	—	—	3.25–3.75	Nickel‑alloy hydrogen‑resistant
A202 Gr B	≤0.23	0.70–1.60	≤0.50	—	—	—	High‑strength hydrogen service
Q370R	≤0.20	≤1.70	≤0.50	—	—	—	GB hydrogen‑resistant steel

🟪 Physical Properties (General)

• Density: ~7.85 g/cm³
• Modulus of Elasticity: ~210 GPa
• Thermal Expansion Coefficient: ~11–13 × 10⁻⁶ /K
• Thermal Conductivity: ~40–50 W/(m·K)
• Creep Resistance: High (Cr‑Mo grades)

🟪 Applications

• Hydrocracking units
• Hydrotreaters
• Hydrogen reactors
• High‑temperature refinery vessels
• Hydrogen‑rich petrochemical systems
• High‑pressure, high‑temperature pressure vessels

🟪 Why use it

Hydrogen‑resistant pressure vessel steels are essential for equipment exposed to high‑temperature hydrogen, where standard steels fail due to:

• Hydrogen embrittlement
• Hydrogen‑induced cracking
• High‑temperature hydrogen attack (HTHA)

These steels ensure safe, long‑term operation in refinery and petrochemical hydrogen environments.

🟪 Why Choose WelSteels

• Full range of hydrogen‑resistant pressure vessel steel grades
• Expertise in Cr‑Mo, Ni‑alloy, and high‑temperature hydrogen steels
• Precision cutting, beveling, rolling, and heavy‑plate processing
• Third‑party inspection available (SGS / BV / TUV)
• Export‑grade seaworthy packaging and stable global supply