Alloy Steel Plates Suppliers, Saudi Arabia

Alloy steel plates are flat products containing chromium, molybdenum, and other alloying elements for use in pressure vessels, boilers, and structural applications requiring elevated strength or temperature resistance. Key grades include ASTM A387 (Cr-Mo), ASTM A514 (quenched and tempered), and ASTM A204 (Mo alloy). GCC fabrication shops consume significant volumes for pressure vessel and heat exchanger shell construction in the petrochemical sector.

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Alloy steel plates are specified for pressure vessels, boilers, heat exchangers, and high-strength structural applications across the UAE and Saudi Arabia. The primary standards include ASTM A387 Gr.11/22/91 for chromium-molybdenum pressure vessel plates, ASTM A514 for quenched and tempered high-strength plates, and ASTM A204 for molybdenum alloy plates.

These plates are designed for elevated-temperature and high-pressure service found in GCC refineries, petrochemical complexes, and combined cycle power plants. Grade selection depends on the design temperature, pressure, and corrosive environment, with A387 Gr.11 Class 2 and Gr.22 Class 2 being the most commonly specified for refinery equipment fabrication in the region.

Fabrication yards in Jebel Ali, Hamriyah, and Jubail process alloy plates into pressure vessel shells, heads, and baffles using specialized welding procedures. Procurement managers should specify grade, class (1 or 2 based on strength requirements), normalized or quenched and tempered condition, and supplementary testing including simulated post-weld heat treatment (SPWHT) mechanical properties. Sourcing from mills with ASME stamps and Saudi Aramco or ADNOC approval adds assurance for critical project procurement.

Frequently Asked Questions — Alloy Steel Plates

What is the difference between ASTM A387 Class 1 and Class 2 plates?

Class 1 has lower tensile and yield strength requirements, suitable for less demanding services. Class 2 has higher strength requirements, achieved through additional heat treatment, and is specified for pressure vessels operating at higher design stresses.

Which alloy plate grades require PWHT simulation testing in GCC projects?

Most EPC specifications for GCC petrochemical projects require simulated PWHT testing on A387 Gr.11, Gr.22, and particularly Gr.91 plates to verify that mechanical properties remain acceptable after the post-weld heat treatment cycles applied during fabrication.

What are typical lead times for alloy steel plates in the GCC?

Ex-stock availability for common grades (A387 Gr.11/22 in standard thicknesses) is limited to 1-2 weeks from specialist stockists. Indent orders from European or Japanese mills typically take 12 to 20 weeks depending on grade, thickness, and testing requirements.