🟪 Product Overview

Low‑Temperature Pressure Vessel Steel Plate is engineered for sub‑zero and cryogenic service, where conventional carbon steel becomes brittle and unsafe. These steels maintain:

• High impact toughness at low temperatures
• Stable microstructure under temperature cycling
• Good weldability and fabrication performance
• Reliable resistance to brittle fracture

They are widely used in LNG storage, cryogenic equipment, low‑temperature pressure vessels, and petrochemical low‑temperature systems.

🟪 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 impact toughness at sub‑zero temperatures
• Nickel‑alloy and normalized options for enhanced low‑temperature performance
• Good weldability and formability for pressure vessel fabrication
• Stable mechanical properties under repeated cooling and heating cycles
• Suitable for thick‑wall, high‑pressure, low‑temperature vessels

🟪 Included Grades

ASTM / ASME

• A203 (Grade A / B / D / E / F) — Nickel‑alloy cryogenic steel
• A516N (Normalized A516 Gr 60 / 65 / 70 with low‑temperature impact test)
• A537 (Class 1 / 2 / 3, impact tested for low‑temperature service)

EN 10028‑3 / 10028‑4

• P355NL1 / P355NL2
• P460NL1 / P460NL2

GB / Chinese Standard

• Q345R (normalized, low‑temperature tested)
• 09MnNiDR / 06Ni9DR（if included in your product range）

🟪 Mechanical Properties (Typical)

Grade	Yield Strength	Tensile Strength	Impact Toughness	Test Temperature
A203 Gr E	≥345 MPa	550–690 MPa	≥34 J	−101°C
A516N Gr 70	≥260 MPa	485–620 MPa	≥27 J	−20°C
A537 Cl 1	≥345 MPa	485–620 MPa	≥27 J	−40°C
P355NL2	≥355 MPa	490–630 MPa	≥27 J	−50°C

🟪 Chemical Composition (Typical)

Grade	C (%)	Mn (%)	Si (%)	Ni (%)	Mo (%)	Notes
A203 Gr E	≤0.17	0.70–1.00	≤0.35	3.25–3.75	—	Nickel‑alloy cryogenic steel
A516N Gr 70	≤0.27	0.85–1.20	≤0.40	—	—	Normalized low‑temperature use
A537 Cl 1	≤0.24	0.70–1.60	≤0.50	—	—	High‑strength PV steel
P355NL2	≤0.20	0.80–1.50	≤0.40	—	—	EN low‑temperature PV steel

🟪 Physical Properties (General)

• Density: ~7.85 g/cm³
• Modulus of Elasticity: ~210 GPa
• Thermal Expansion Coefficient: ~11–13 × 10⁻⁶ /K (20–200°C range)
• Thermal Conductivity: ~40–50 W/(m·K)

(Values are typical for low‑alloy pressure vessel steels; exact values depend on grade and condition.)

🟪 Applications

• LNG storage tanks and terminals
• Cryogenic pressure vessels and storage tanks
• Liquid oxygen / nitrogen / argon tanks
• Low‑temperature refinery and petrochemical units
• Gas separation and refrigeration systems
• Low‑temperature pipelines and pressure systems

🟪 Why Use it

Low‑temperature pressure vessel steels are required when equipment operates below freezing, where standard carbon steels lose toughness and become brittle. These steels ensure:

• Safe operation in sub‑zero environments
• Compliance with pressure vessel design codes
• Long‑term reliability under temperature cycling

🟪 Why Choose WelSteels

• Complete range of low‑temperature pressure vessel steel grades
• Expertise in nickel‑alloy and normalized low‑temperature steels
• Precision cutting, beveling, rolling, and heavy‑plate processing
• Third‑party inspection available (SGS / BV / TUV)
• Export‑grade seaworthy packaging and stable global supply