ASME SA192: Seamless Carbon Steel Boiler Tubes

Overview

ASME SA192, also written SA-192 or ASTM A192/A192M when referenced through ASTM, specifies minimum-wall seamless carbon steel boiler and superheater tubes. It is a tube standard, not a pipe standard, so do not confuse it with ASTM A106/ASME SA106 seamless pipe. Order SA192 by outside diameter and minimum wall thickness, with the exact grade designation, edition, length, quantity, condition, straight or bent form, marking, packing, tests and inspection plan required by the approved boiler drawing. "Minimum wall" means the supplied tube must not fall below the ordered basis after the applicable tolerance, which affects code calculation, bending allowance, fabrication and remaining wall. SA192 is not automatically interchangeable with SA210 or SA213. Compare the governing material specification, chemistry, strength, allowable-stress line, design temperature and pressure, service life, corrosion allowance, fabrication, welding and authority approval before any substitution. For an IBR-controlled tube, the official forms index assigns Form III-B, not Form III-C. The complete file may also require a mill inspection document, heat or lot traceability, heat-treatment and test records, inspection release and other evidence from the approved plan. The physical marking, packing list, certificate, test reports and purchase order must all point to the same supplied lot. RP Sales can request this evidence from a proposed source, but the boiler designer and competent authority decide material and regulatory acceptance. Pricing and timing depend on actual stock, source approval, tests, authority scheduling, tax, freight and delivery terms, so use a current written quotation instead of a universal premium or lead-time claim.

What SA192 is, and what it is not

SA192 is a minimum-wall seamless carbon steel boiler and superheater tube specification. It is one carbon grade, not a pipe schedule product and not a chrome-moly alloy.

The ASTM A192/A192M store listing retrieved on 2026-09-03 titles it Standard Specification for Seamless Carbon Steel Boiler Tubes for High-Pressure Service. Scope 1.1 covers minimum-wall-thickness seamless carbon steel boiler and superheater tubes.

Usual sizes on that abstract are 1/2 in to 7 in (12.7 to 177.8 mm) outside diameter and 0.085 to 1.000 in (2.2 to 25.4 mm) inclusive in minimum wall. Other dimensions may be furnished if they meet the rest of the specification. The listing also shows A192/A192M-24 as the active designation.

SA192 is not ASTM A106, which is high-temperature process pipe ordered by NPS and schedule. It is also not SA210 Grade C, the medium-carbon, higher-strength boiler-tube family, and it is not IS 1239 water tube.

Who should buy SA192 for Kanpur sugar-mill boilers

Buy SA192 for generating-bank, economizer and other carbon-steel heat-transfer tubes when the boiler drawing names SA192 or A192. Sugar-mill bagasse boilers and industrial water-tube boilers use this grade when the designer stays with plain carbon steel. A Kanpur stores team should keep this as a tube order, not as A106 schedule pipe.

Do not buy SA192 for a drawing that says SA210 Grade A1 or Grade C: tensile minima differ (SA192 325 MPa min vs SA210 A1 415 MPa min on this site). Do not buy it for SA213 T11/T22 superheaters either.

Do not use SA192 as site steam pipe when the isometric says A106 Sch 40. Tube OD and pipe NPS are different ordering languages, and expansion into a tube sheet needs tube dimensions, not schedule pipe.

If an IBR route is in scope, confirm Form III-B for the tube and state the approved source, inspection plan, traceability, tests and supporting records. Get mill and authority timing in writing rather than adding a generic number of days.

SA192 scope and common applications

SA192 covers seamless carbon steel boiler and superheater tubes ordered to minimum wall thickness. It is used for heat-transfer tubing in high-pressure boilers, especially where a plain carbon steel tube satisfies the design temperature and code allowable stress.

Because SA192 is a tube specification, it should be ordered by OD and minimum wall, not by nominal pipe size and schedule. This distinction matters when matching tube sheets, bending machines and boiler drawings.

Chemical composition reference

• Carbon: 0.06-0.18% typical SA192 range.
• Manganese: 0.27-0.63% typical range.
• Phosphorus: 0.035% max typical limit.
• Sulphur: 0.035% max typical limit.
• Silicon: commonly 0.25% max depending on current specification wording.

Mechanical properties reference

• Tensile strength: 325 MPa minimum typical requirement.
• Yield strength: 180 MPa minimum typical requirement.
• Elongation: 35% minimum typical longitudinal requirement in 50 mm.
• Hardness: controlled by specification to maintain formability and boiler fabrication suitability.
• Flattening, flaring, flange, hardness and hydrostatic/NDE tests may apply by size and purchase requirement.

Equivalent grades and substitutions

SA192 is the ASME counterpart of ASTM A192/A192M. It is normally compared with SA210 for medium-carbon boiler tubes and with ASTM A106/ASME SA106 when the item is pipe rather than tube. Do not substitute ASTM A53 or IS 1239 for boiler pressure parts.

How to specify SA192 on an RFQ

Write OD × minimum wall × length × quantity. "Boiler tube" without wall basis is how average-wall material arrives against a minimum-wall drawing.

• Standard: ASME SA192 / ASTM A192, minimum wall stated in words
• Size: OD and minimum wall in mm. Do not use NPS × schedule
• Process: seamless, hot-finished or cold-finished as ordered
• Length: mill random or cut-to-length; U-bend if the bank is bent
• End finish: square for expansion, or as the tube-sheet drawing shows
• Tests: flattening, flaring/flange, hardness, hydrostatic or NDE as applicable
• Documents: project-defined inspection certificate and heat traceability; for an IBR tube, verify Form III-B and supporting records
• Inspection: authority and witness points confirmed under the approved plan
• Packing: heat-stencilled bundles, ends protected for tube-sheet fit-up
• Delivery: metres or MT, destination, ex-works Kanpur or site

SA192 price is not fixed by this standard or page. Ask for a current quotation for the exact designation, edition, OD, minimum wall, condition, length, quantity, approved source, testing, inspection, document route, availability, legally applicable tax, freight and delivery basis.

Worked mass example: 50.8 mm OD × 3.6 mm minimum wall

Use W = (OD - t) × t × 0.02466 kg/m. For 50.8 mm OD and 3.6 mm wall: (50.8 - 3.6) × 3.6 × 0.02466 = 47.2 × 3.6 × 0.02466 = 4.19 kg/m.

Eighty lengths of 7 m = 560 m. Mass = 560 × 4.19 = 2,346 kg, which is 2.35 MT of steel.

Use the verified theoretical or certified lot mass only with the current quoted unit rate and its stated mass basis. Do not apply a universal IBR premium, inspection fee, tax rate, freight allowance or lead time; get every commercial and release term in writing for the actual supply.

Minimum wall means the tube must not go below 3.6 mm at any point after tolerance. An average-wall offer at the same nominal 3.6 mm is a different product, so reject it unless the drawing allows average wall.

Common mistakes on SA192 procurement

In practice, A106 Sch 40 is offered because both are "seamless carbon". Pipe schedule will not expand into a 50.8 mm tube-sheet hole the way the drawing expects.

SA210 Grade C is substituted as a stronger tube, but carbon, tensile and forming behaviour differ. The boiler designer must approve the change.

Average wall is shipped against a minimum-wall PO. Remaining wall after bend and corrosion allowance is then short of the calculation.

The prescribed Form III-B or another required record is missing, or the heat on the stencil does not match the controlled document set. Hold the lot for authority clarification before installation.

U-bent radius, ovality and post-bend tests are left out. Straight-tube MTC does not cover a bent bank unless the mill bent and tested it.

Standards and compliance for Indian jobs

ASME SA192 is the BPVC material. ASTM A192/A192M is the ASTM publication. The store abstract retrieved on 2026-09-03 is the source for the 12.7-177.8 mm OD and 2.2-25.4 mm minimum-wall usual range.

Chemistry on this page: carbon 0.06-0.18%, manganese 0.27-0.63%, phosphorus 0.035% max, sulphur 0.035% max, silicon 0.25% max typical. Mechanicals: tensile 325 MPa min, yield 180 MPa min, elongation 35% min typical.

Do not treat SA-192 as blanket approval for every IBR design. Confirm the exact edition, condition, design approval, source and authority route. The official forms index assigns tubes to Form III-B; an EN 10204 document is distinct supporting evidence.

Do not treat IS 1239, ASTM A53 or IS 3589 as boiler-tube substitutes. Those standards are on this site for water, general pipe and large water mains, not for tube-sheet pressure parts.

Key points

• SA192 is minimum-wall seamless carbon steel boiler tube, ordered by OD and wall, not by schedule.
• ASTM abstract usual range (retrieved 2026-09-03): 12.7-177.8 mm OD, 2.2-25.4 mm minimum wall.
• Tensile 325 MPa min and yield 180 MPa min on this page. That is below SA210 A1 (415 MPa tensile).
• 50.8 × 3.6 mm is 4.19 kg/m. Eighty pieces of 7 m weigh 2.35 MT.
• For an IBR tube, confirm Form III-B and the complete approved document set on the RFQ. Existing stock requires a fact-specific authority review of condition, traceability, source approvals and records.