SA387 Alloy Steel Plate Supplier India — ASTM A387 Gr 11/22/91

ASTM A387 (ASME SA387) is a Cr-Mo alloy steel plate specification designed for pressure vessel and boiler construction operating at elevated temperatures. The plates are used for fabricating reactor shells in hydroprocessing and hydrotreating units, high-pressure separator vessels, boiler drums and headers in thermal power plants, heat exchangers and column shells in refineries, and hydrogen service equipment. The chromium content (1.25% to 9%) provides oxidation resistance while molybdenum enhances creep strength at elevated temperatures up to 600°C.

SA387 Class 1 and Class 2 differ in mechanical properties and heat treatment requirements. Class 1 has lower tensile strength (450-585 MPa for Gr.11) and can be supplied in as-rolled or normalised condition — suitable for less critical applications at moderate temperatures. Class 2 has higher tensile strength (515-690 MPa for Gr.11) and must be normalised and tempered — required for critical pressure vessels, boiler drums, and high-temperature service. Class 2 plates have mandatory impact testing and are specified for all IBR and critical ASME code construction.

We maintain comprehensive stock of ASTM A387 / SA387 Cr-Mo alloy steel plates in Grade 11 (1.25Cr-0.5Mo), Grade 22 (2.25Cr-1Mo), Grade 5 (5Cr-0.5Mo) and Grade 91 (9Cr-1Mo-V-Nb) in both Class 1 and Class 2. Thickness range is 6mm to 150mm. Standard plate sizes are 2000mm x 6000mm, 2500mm x 10000mm and 3000mm x 12000mm. All Class 2 plates are supplied normalised and tempered with full MTC per EN 10204 3.1/3.2. IBR Form III-C available for all grades used in boiler construction.

Yes, Creative Metal Industries supplies SA387 plates with IBR Form III-C certification for boiler and pressure vessel applications. Our IBR-certified stock includes Grade 11 Class 2 and Grade 22 Class 2 plates from approved mills including Jindal Steel (India), POSCO (Korea), Salzgitter (Germany) and Dillinger (Germany). IBR documentation includes complete chemical analysis (ladle + product), mechanical properties (tensile, yield, elongation, impact), heat treatment records, and ultrasonic examination results per SA435. All plates individually marked with IBR stamp and heat number.

SA387 plates undergo comprehensive testing including: chemical analysis (spectroscopy) for Cr, Mo, C, Mn, Si, P, S content verification; tensile testing for yield strength, ultimate tensile strength and elongation; Charpy impact testing at specified temperature (typically -20°C or 0°C for Class 2); hardness testing (Brinell) — maximum 225 HBW for Gr.11/22; ultrasonic examination per ASME SA435 for internal soundness; and hydrogen-induced cracking (HIC) testing per NACE TM0284 when specified for sour service applications.

For stock sizes of SA387 Gr.11 and Gr.22 Class 2 plates (6mm to 100mm thickness), we offer immediate dispatch from our Vadodara warehouse. Non-standard sizes or Grade 91 plates typically require 4-6 weeks from our mill partners. For large project quantities (50+ tonnes), direct mill rolling from Jindal, POSCO or European mills takes 8-12 weeks. We can provide cutting and profiling services (flame cut, plasma cut, waterjet) for custom plate blanks with 3-5 day additional lead time.