ASME SA-192 (and its metric twin SA-192M) is the low-carbon, seamless, cold-drawn steel tube specification used across the Indian boiler industry for tube banks of stationary boilers running at low and medium pressure — generally where the metal temperature does not exceed about 350 °C. RP Sales stocks SA-192 in Kanpur in the 25.4 mm to 76.2 mm OD band that covers the bulk of package-boiler and waste-heat-recovery requirements, and we coordinate non-standard sizes direct from IBR-licensed mills on indent. Every dispatch ships with the mill's original Form III-C and the heat-number-traceable Mill Test Certificate, so your IBR boiler inspector can release the material at site without a re-certification round.
What ASME SA-192 actually covers
SA-192 sits inside Section II Part A of the ASME Boiler & Pressure Vessel Code as the spec for “seamless carbon steel boiler tubes for high-pressure service”, although the practical Indian usage is firmly in the low-to-medium-pressure band — high-temperature, high-flux service almost always upgrades to SA-210 Grade A1 or Grade C, or to alloy SA-213 T11/T22 for superheater duty. The spec was harmonised with the older ASTM A-192 (now withdrawn in the standalone ASTM listing in favour of the ASME version), and is referenced verbatim in the Indian Boiler Regulations 1950 schedule of approved tube materials. That cross-reference is why SA-192 is the default carbon-steel tube call in Indian boiler GA drawings.
The tube is manufactured by hot piercing a billet, then cold-drawing the resulting shell to final OD and wall thickness across one or more passes — the cold work is what gives SA-192 its tight tolerances and clean inner surface. After draw, the tube is normalised or stress-relieved depending on the mill route, then hydrostatically (or eddy-current) tested 100 % and flattening-tested on a sample ring from each end. Surface condition is bright (oil-quenched / pickled) or hot-rolled finished — both meet the spec, and we'll confirm which finish ships against your order before dispatch.
Chemical composition (SA-192 / SA-192M)
| Element | Composition (% by mass) | Buyer notes |
|---|---|---|
| Carbon (C) | 0.06 – 0.18 | Lean carbon — keeps the tube cold-bendable |
| Manganese (Mn) | 0.27 – 0.63 | Modest Mn for hardenability without sacrificing weldability |
| Phosphorus (P) | 0.035 max | Residual control — verify on MTC |
| Sulphur (S) | 0.035 max | Residual control — verify on MTC |
| Silicon (Si) | 0.25 max | Deoxidiser residual |
Mechanical properties & testing
- Tensile strength: 325 MPa (47 ksi) minimum
- Yield strength: 180 MPa (26 ksi) minimum
- Elongation: 35 % minimum in 50 mm (longitudinal strip)
- Hardness: 77 HRB maximum
- Hydrostatic test: 100 % of finished tubes, or equivalent NDT (eddy-current)
- Flattening test: ring sample from each tube end
OD & wall thickness range we supply
Common SA-192 sizes we stock in Kanpur and the ones we typically book on indent:
| OD (mm) | Wall thickness (mm) | Availability |
|---|---|---|
| 25.4 | 2.6 – 3.6 | Ex-stock Kanpur |
| 31.8 | 2.6 – 4.0 | Ex-stock Kanpur |
| 38.1 | 2.9 – 4.5 | Ex-stock Kanpur |
| 44.5 | 3.2 – 4.5 | Ex-stock Kanpur |
| 50.8 | 3.6 – 5.0 | Ex-stock Kanpur |
| 63.5 | 4.0 – 5.6 | Indent — 3 to 5 weeks |
| 76.2 | 4.5 – 6.3 | Indent — 3 to 5 weeks |
| Other (12.7 – 114.3) | On demand | Indent — 4 to 6 weeks |
IBR Form III-C and documentation
Every SA-192 tube we dispatch carries the manufacturer's original IBR Form III-C — the certificate that an IBR boiler inspector will ask for at site verification. The Form references the heat number, the IBR mill licence, the Inspecting Authority's stamping, and the chemical / mechanical test results from the original mill cast. We do not regenerate Form III-C — it always travels from the IBR-licensed mill that ran the heat, and the original sheet (not a photocopy) reaches your stores along with the consignment. Read more on how we handle MTC and TPI across the order.
SA-192 vs SA-210 — when to upgrade
If your boiler designer is asking for tubes that will see metal temperatures above 350 °C or higher heat flux (waterwall, superheater, economiser banks on the hotter side), SA-192 is below the design margin and SA-210 Grade A1 or Grade C is the typical upgrade. A useful comparison reference: see our forthcoming SA192 vs SA210 comparison, our SA-210 standards page, and the broader boiler tubes catalogue page. For high-temperature alloy tube needs (Cr-Mo grades), step up to ASTM A335 P11/P22/P91.
Buyer typology — who orders SA-192 from us
- Package boiler OEMs & service contractors — re-tubing 6 to 20 TPH boilers in sugar mills, paper mills, food and pharma plants.
- Waste-heat recovery boiler fabricators — behind diesel gensets, kilns, and process furnaces.
- Feed-water heater & deaerator builders — tube banks where SA-192 is well within design temperature.
- Sugar-mill & distillery maintenance teams — repeat orders for off-season tube replacements; we hold pre-cleared sizes ready.
FAQ — SA-192 supply & documentation
What is the difference between SA192 and SA210 boiler tubes?
Do you supply SA192 tubes with IBR Form III-C?
What OD and wall thickness range do you stock in SA192?
What is the chemical composition of SA192 steel?
What are the mechanical properties of SA192 tubes?
Where is SA192 tube typically used in Indian boiler installations?
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