Boiler Quality Plates Explained: ASTM A516 vs IS 2002 vs SA 387
'Boiler Quality' (BQ) is an umbrella term covering multiple international and domestic standards, each suited to different pressure, temperature, and service conditions. This guide compares the three standards Convergence Steel supplies most — ASTM A516, IS 2002, and SA 387 Chrome Moly — to help you specify the right one.
What Counts as a Boiler Quality Plate?
BQ plates are carbon and alloy steel plates manufactured specifically for welded pressure vessels, boilers, and heat exchangers, engineered to withstand high pressures and varying temperatures without brittle fracture or creep failure. The right standard depends on your operating temperature, pressure class, project geography, and whether the vessel falls under ASME, Indian BIS, or another code.
ASTM A516: The International Default
ASTM/ASME A516, most commonly specified as Grade 70, is the world's default PVQ steel for moderate- to low-temperature service. It offers an excellent balance of strength and notch toughness and is available normalized or as-rolled, with HIC/NACE MR0175 testing available for sour service. It is the natural choice for internationally coded vessels and export projects.
IS 2002: The Indian National Standard
For projects governed by Indian codes — particularly those requiring Indian Boiler Regulations (IBR) certification — IS 2002 Grade 1 or Grade 2 is the mandated specification. While broadly comparable to ASTM A516 Grade 55–70, IS 2002 has its own distinct chemical and mechanical limits and is the standard route to statutory compliance for domestic thermal power and boiler projects.
SA 387: Chrome Moly for High-Temperature Creep Resistance
When a vessel must operate continuously above 400–500°C, carbon steel grades like A516 or IS 2002 are no longer sufficient — creep becomes the dominant failure mode. SA 387 Chrome Moly plates (commonly Grade 11 or Grade 22) add chromium and molybdenum alloying to resist creep and maintain strength at elevated temperatures, making them essential for refinery reactors, high-temperature heat exchangers, and petrochemical process vessels.
How to Choose the Right BQ Standard
Start with your operating temperature and pressure: for standard low-to-moderate temperature vessels on international projects, specify ASTM A516. For Indian domestic boiler projects requiring IBR sign-off, specify IS 2002. For continuous high-temperature service, move to SA 387 Chrome Moly. Convergence Steel stocks all three standards and can advise on the correct grade, testing, and certification for your specific vessel design code.
Conclusion
Choosing the correct boiler quality standard is a safety-critical engineering decision, not a matter of preference. Convergence Steel supplies ASTM A516, IS 2002, and SA 387 Chrome Moly plates with full mill certification, third-party inspection, and supplementary testing including UT and impact testing available on request.
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