ASTM A387 Grade 11 Class 1 is a chromium-molybdenum alloy steel plate specifically designed for high-temperature and high-pressure environments. It offers good high-temperature strength, resistance to hydrogen corrosion, weldability, and workability. It is primarily used in the manufacturing of welded boilers, pressure vessels, and other industrial equipment operating under high-temperature and high-pressure conditions.

Key Features and Advantages

1. Excellent High-Temperature Performance: Maintains good strength and creep resistance at temperatures as high as 595°C (1100°F).

2. Hydrogen Attack Resistance: The addition of chromium and molybdenum enables it to resist the erosion of steel by hydrogen atoms in high-temperature and high-pressure hydrogen environments (such as hydrotreating units in refineries), preventing hydrogen-induced cracking and hydrogen blistering.

3. Good Weldability: Due to its lower carbon equivalent, A387 Gr.11 offers better weldability than higher-grade chromium-molybdenum steels (e.g., Gr.22). However, strict welding procedures, including preheating and post-weld heat treatment, must still be followed.

4. Sufficient Toughness and Ductility: The annealed condition provides good formability and processing capabilities.

ASTM A387 Grade 11 Class 1 (A387GR11CL1) steel plate is specifically used for manufacturing equipment that operates in high-temperature, high-pressure, and corrosive environments.

1. Petrochemical Industry: Hydrogenation reactors, synthesis towers, heat exchangers, separators, etc., capable of withstanding high temperatures, high pressures, and corrosive media (such as hydrogen, hydrogen sulfide).

2. Power Industry: Power station boiler drums, high-temperature pipelines, suitable for supercritical units with steam parameters up to 540°C.

3. Nuclear Energy Sector: Nuclear reactor pressure vessels and auxiliary equipment, meeting stringent safety requirements.

4. Other Applications: Liquefied petroleum gas storage tanks, high-pressure pipelines for hydropower stations, industrial furnace components, etc.

Comparison: Class 1 vs. Class 2

Why Choose ASTM A387 Grade 11 Class 1(A387GR11CL1) Boiler And Pressure Vessel Steel Plate for Oil & Gas Projects?

✔ High-Temperature Service: Up to 595°C (1100°F)

✔ Hydrogen Resistance: Prevents embrittlement in H₂-rich environments

✔ Sour Service Capability: NACE MR0175 compliant option available

✔ Optimized Weldability: Low cracking risk with proper PWHT