Comparison Guide

SA192 vs SA210 Boiler Tubes — IBR, Tensile and Temperature Compared

Minimum-wall carbon boiler tube versus medium-carbon boiler and superheater tube for IBR procurement in Indian boiler plants.

Last reviewed
By Ajay Jaiswal · IS · 28 yrs
Reviewed byAyush Jaiswal·

ASME SA192 is a low-carbon seamless boiler tube (0.06 to 0.18 percent C, 325 MPa tensile minimum) for stationary boiler tube banks up to about 350 to 510 °C. SA210 covers higher-strength medium-carbon grades — Gr A1 at 415 MPa, Gr C at 485 MPa — for boiler and superheater duty to about 530 °C. The two are not interchangeable.

SA192 vs SA210 Gr A1 vs Gr C — buyer comparison

ASME SA192 vs SA210 Gr A1 vs SA210 Gr C — chemistry, mechanical properties, service temperature and IBR approval compared
AttributeSA192SA210 Gr A1SA210 Gr C
Carbon %0.06 – 0.180.27 max0.35 max
Manganese %0.27 – 0.630.93 max0.29 – 1.06
Tensile strength min325 MPa (47 ksi)415 MPa (60 ksi)485 MPa (70 ksi)
Yield strength min180 MPa (26 ksi)255 MPa (37 ksi)275 MPa (40 ksi)
Elongation min35 %30 %30 %
Service temp class~350 – 510 °C~450 – 530 °C~480 – 530 °C
Typical useWaterwall, generating banksHigher-stress generating banksSuperheater, high-stress banks
IBR Form III-CYes from registered millsYes from registered millsYes from registered mills
Typical costBaseline+20-25% over SA192+25-30% over SA192
Lead time band7-21 days stock14-30 days IBR slot14-30 days IBR slot

When to choose SA192

If the boiler GA drawing calls SA192 for waterwall, economiser or generating-bank tubes below about 350 °C metal temperature, SA192 is the correct grade and the cost saving over SA210 is real. The low carbon makes SA192 easier to cold-bend on shop benders, easier to weld with standard procedure and gives predictable creep behaviour for stationary package boilers. The Indian sugar-mill, food-processing and pharma boiler ecosystem runs largely on SA192 for these reasons.

When to choose SA210 Gr A1 or Gr C

Move up to SA210 Gr A1 when the boiler designer's stress calculation needs more than 325 MPa tensile (typical of higher-stress generating banks and the lower end of superheater service). Step to Gr C when the section is true superheater duty, the metal temperature climbs toward 530 °C or the design stress is at the upper end of the SA210 family. The IBR Form III-C paperwork is available on both grades from registered mills, but lead times in IBR inspection slots add 14 to 30 days versus SA192's 7 to 21.

IBR Form III-C — what travels with the consignment

Both SA192 and SA210 boiler tubes ship from registered mills with the original Form III-C — the certificate referencing the heat number, the IBR mill licence and the Inspecting Authority's counter-signature. For any tube reaching an IBR boiler bank, your inspector at site will check the Form against the actual heat numbers stamped on the tube ends. RP Sales dispatches the original Form (not a photocopy) along with the consignment and the heat-wise MTC. See our SA192 standard page, SA210 standard page and IBR overview.

Why grade substitution fails inspection

Boiler drawings reference a specific grade because the design stress calculation in IS 7344 and IBR Section II depends on the actual allowable stress at metal temperature, which is grade-specific. Sending SA192 where SA210 Gr A1 is drawn looks cosmetically similar at site but the inspector reads the heat-wise MTC and the Form III-C grade — any mismatch with the drawing rejects the consignment. The cost saving from substitution is always smaller than the cost of re-procuring after rejection, especially under an outage timeline.

FAQ — SA192 vs SA210 procurement

What is the difference between SA192 and SA210 boiler tubes?
Both are seamless carbon-steel boiler tube specifications under ASME Section II Part A, but SA192 is a low-carbon spec (0.06 to 0.18 percent C) intended for moderate-temperature stationary boiler tube banks, while SA210 covers higher-strength medium-carbon grades for boiler and superheater duty. SA192 has a 325 MPa tensile minimum and is suitable to about 350 to 510 °C metal temperature; SA210 Gr A1 lifts that to 415 MPa, and SA210 Gr C to 485 MPa with service capability up to about 530 °C. The two are not interchangeable on boiler drawings.
When does an IBR boiler drawing call for SA210 instead of SA192?
When the tube bank sees higher metal temperature (typically above 350 °C continuously), higher heat flux (superheater rather than waterwall) or higher design stress that pushes SA192 past its allowable. IBR Form III-C boiler approval covers both materials, but the boiler designer pins the grade on the GA drawing based on the thermal calculation. Substituting SA192 where SA210 is drawn will fail inspection because the design stress margin disappears at high temperature.
What is the chemical composition difference between SA192 and SA210 Gr A1?
SA192 limits carbon to 0.06 to 0.18 percent, manganese 0.27 to 0.63 percent. SA210 Gr A1 allows carbon up to 0.27 percent, manganese 0.93 percent max — the higher carbon is what lifts tensile strength from 325 MPa to 415 MPa minimum. SA210 Gr C goes higher still: carbon up to 0.35 percent, manganese 0.29 to 1.06 percent, tensile minimum 485 MPa. The chemistry differences are small in absolute terms but materially change the creep and stress-rupture behaviour at boiler temperatures.
Is SA210 always better than SA192 for boiler service?
No — over-specifying SA210 where SA192 is drawn adds cost without engineering benefit at moderate temperatures, and the higher carbon content makes SA210 slightly less weldable (more pre-heat, more controlled cool-down). For waterwall and economiser banks below the SA192 temperature ceiling, SA192 is the correct, cheaper choice. The right answer is “the lowest-cost grade that meets the boiler designer's stress and temperature envelope”, which is usually SA192 for stationary package boilers and SA210 only for the hotter or higher-stress banks.
Do you supply SA192 and SA210 with IBR Form III-C?
Yes. Both SA192 and SA210 Gr A1 / Gr C are stocked or sourced from IBR-licensed mills with the original Form III-C, heat-wise MTC and Inspecting Authority counter-signature. For RP Sales dispatch from Kanpur, we ship the original Form (not a photocopy) with the consignment, and the document references the heat number, mill licence and tested chemical-mechanical values. Lead times run 7 to 21 days for SA192 stock sizes and 14 to 30 days for SA210 Gr A1/C in non-stock IBR slots.
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