ASTM A203 Grade F is a high-nickel alloy pressure vessel steel plate designed for welded equipment operating in extremely low-temperature environments. With its 9% Ni composition and refined metallurgical structure, A203 Gr.F provides exceptional impact toughness, stable weldability, and reliable strength retention under deep-cryogenic service conditions. It is widely used in LNG storage tanks, cryogenic reactors, gas-liquefaction units, and pressure systems requiring maximum low-temperature resistance and long-term structural reliability.
Chemical Composition

C	Mn	P	S	Si	Ni
≤0.13	0.40–0.60	≤0.025	≤ 0.025	0.15–0.30	8.25–9.75

 
Mechanical Properties

Property	Yield Strength	Tensile Strength	Elongation	Impact Energy
Requirement	≥ 345 MPa	585-760MPa	≥ 20%	Excellent cryogenic performance (per ASTM A203 requirements)

 
Dimensions

Thickness	3–150 mm
Width	1220–4200 mm
Length	5000–18000 mm
Supports custom cutting and shaping.

 
 5. Stock & Processing
Regular stock for A203 Grade F
Cutting, drilling, welding, bending, machining
Custom dimensions available
Fast delivery for project orders
Global supply capability
 
6. Applications     
LNG storage tanks & terminals
Deep-cryogenic pressure vessels
Gas-liquefaction and separation systems
Low-temperature reactors
Welded components requiring 9% Ni toughness