ASME SA789 UNS S39277 Super Duplex Stainless Steel Tube

ASME SA-789 / SA-789M lists UNS S39277 as a tightly controlled W+Cu super duplex: chromium 24.0–26.0%, nickel 6.5–8.0%, molybdenum 3.00–4.00%, nitrogen 0.23–0.33%, copper 1.20–2.00%, tungsten 0.80–1.21%, carbon ≤0.025%, with very low sulfur 0.002% max. High Cu with moderate W and a higher tensile/yield pair distinguish it from S39274.

SHH STEEL can produce and supply ASME SA789 UNS S39277 super duplex stainless steel tube in seamless and welded (no filler metal) forms, with EN 10204 3.1 MTCs reporting Cu/W and the tight S/P/C maxima, the 120/90 ksi tensile pair with 25% elongation, and Table 2 heat treatment at 1975–2155 °F. Dual marking is available when requested.

Compare SA789 S39274 for higher W / lower Cu; SA789 S32760 for PREN ≥40 footnote; SA789 S32550 for Cu-rich without W; SA789 S32750 for 2507. Plate: A240 / SA240. Hub: SA789/SA789M.

Table 1 of ASME SA-789 fixes the heat analysis for S39277. Product analysis applies when Section 8 or the purchase order invokes it through A1016/A1016M, using A480/A480M tolerances. SHH STEEL reports actual ladle values on the EN 10204 3.1 MTC for every heat.

Mid-range PREN with Cr ≈25, Mo ≈3.5, N ≈0.28 gives PREN ≈ 41.0. Copper 1.20–2.00% and W 0.80–1.21% are required. Carbon ≤0.025% and sulfur ≤0.002% are among the tightest maxima in Table 1. No PREN footnote applies to S39277 in SA-789.

Table 4 sets tensile and hardness requirements for S39277 after final heat treatment. Lot sampling follows Section 9. Mechanical properties do not apply below 1/8 in. [3.2 mm] OD or 0.015 in. [0.4 mm] wall.

Table 4 requires tensile 120 ksi [825 MPa] min, yield 90 ksi [620 MPa] min, elongation 25% min, hardness max 290 HBW / 30 HRC / 290 HV — higher yield than S32750 with a lower hardness ceiling. Source: ASME BPVC.II.A-2023 SA-789 Table 4.

ASME SA-789 allows S39277 as seamless tube or as welded tube made with no filler metal. After welding, the finished tube is heat-treated under Table 2, and marking must state the manufacture route with average or minimum wall so receiving can match each length to the purchase order and MTC.

Seamless lots take flaring to at least 10% ID expansion on one end of one tube per lot. Welded lots take flange testing plus reverse flattening on each 1500 ft [450 m] of finished tubing. Tension and hardness apply to both routes. SHH STEEL produces both SA789 S39277 routes and records them on stencil and EN 10204 3.1 MTC.

Order ASME SA789 S39277 by OD × wall (average unless minimum is specified) and length in tube / BWG language, not B36.19 pipe schedules first. Table 5 sets OD-group tolerances; clause 12.2 covers thin-wall ovality.

Source: ASME BPVC.II.A-2023 SA-789 Table 5. SHH STEEL quotes average-versus-minimum wall explicitly on every S39277 enquiry. Write average or minimum wall on every line item so Table 5 percentage bands are unambiguous at receiving.

ASME SA-789 UNS S39277 is the governing tubing designation for this article. Approximate wrought names are chemistry-family hints, not automatic Code substitutes on an SA-789 mill test certificate. Confirm the product standard and tensile row before accepting a commercial nickname on the certificate.

Spell the UNS number and ASME SA789 on the purchase order rather than relying on a shop nickname alone. Confirm the product standard and tensile row before accepting a commercial nickname on the certificate.

Table 2 requires S39277 solution treatment at 1975–2155 °F [1080–1180 °C] followed by rapid cooling in air or water. The 1975–2155 °F [1080–1180 °C] band is among the highest soak windows in Table 2.

Seamless tubes may be quenched after hot forming when temperature is not below the minimum solution-treatment temperature. Skipping or under-cooling risks intermetallics and undermines corrosion performance. SHH STEEL delivers SA789 S39277 only heat-treated per Table 2, with the record on the MTC.

Estimated PREN near 41.0 plus elevated copper places S39277 in super-duplex chloride service emphasizing Cu+W chemistry with clean residual control. Confirm project specs versus SA789 S32760 when a PREN ≥40 footnote is mandatory.

High alloy content still needs rapid cooling. Observe SA-789 embrittlement warnings. Materials review should precede any attempt to stretch this grade outside its PREN and temperature envelope.

S39277 tube is specified when Cu+W super duplex with tight C/S control and 120/90 ksi floors is written into the datasheet. Match fluid chemistry and temperature to the PREN estimate and Table 4 floors before freezing the bill of materials.

If PREN ≥40 footnote is required, compare SA789 S32760. If higher W is written, compare SA789 S39274. Match fluid chemistry and temperature to the PREN estimate and Table 4 floors before freezing the bill of materials.

Welding Cu+W super duplex needs qualified procedures and prompt cooling. Mill welded SA-789 product stays autogenous. Tight residual chemistry does not remove the need for HAZ control on S39277 joints.

SHH STEEL can discuss filler families; the fabricator owns WPS/PQR. Procedure qualification on the actual UNS avoids ferrite and sigma surprises in the heat-affected zone.

Standard delivery for SA789 S39277 is heat-treated and descaled/pickled per Section 13, free of excessive mill scale. Bright anneal or Ra-controlled finishes are agreement items that must appear on the order.

SHH STEEL quotes special finishes against the written enquiry rather than assuming them with the grade stamp for S39277. Call any Ra or bright requirement out on the enquiry so mill routing can include it before the heat is reserved.

Testing covers Table 1 chemistry, Table 4 tension and hardness, flare or flange tests by route, reverse flattening for welded tube, and hydro or NDE on each length using duplex hydrostatic factor 64000 (441.2). Manufacturer chooses hydro versus NDE unless the PO locks the method.

Marking shows seamless or welded and wall basis. SHH STEEL 3.1 MTCs tie heat, chemistry, mechanicals, heat treatment, and test method to each length for receiving clearance. Receiving teams should verify hydro-versus-NDE against the purchase order before releasing tube to fabrication.

S39277 tube ships from SHH STEEL in tagged bundles with end protection matched to length. Tags repeat ASME SA789, grade, route, OD × wall, heat number, and PO reference for export or domestic delivery.

Wrapped bundles or wooden cases are available for bright or small-bore material. Incoterms and MTC flow follow the order acknowledgment. Keep bundle tags legible after ocean transit so port and site receiving can proceed without remarking every length.

SHH STEEL produces and supplies ASME SA789 UNS S39277 as manufactured Cu+W super-duplex Code Book tube, reporting the tight C/S maxima and Cu/W ranges on the EN 10204 3.1 MTC and meeting 120/90 ksi floors.

If a different W+Cu UNS is intended, we clarify before producing. Dual marking is available on request. Honest sister-grade advice protects Code stamp integrity when a different UNS would fit the corrosion envelope better.

SHH STEEL can produce and supply ASME SA789 UNS S39277 against the edition, route, and finish on your enquiry. Capability and Stock / Available sizes follow. Clear enquiry data on OD, wall, and route shortens quotation turnaround for export and domestic Code jobs.

Stock / Available sizes — Regular enquiry bands include OD about 12.7–50.8 mm with common BWG / metric walls; larger Table 5 groups by agreement. Cut lengths on request. Send OD × wall, route, and quantity — no invented tonnage lists.

List ASME SA789 UNS S39277, seamless or welded, OD × wall, wall basis, length, and quantity on the enquiry. Clear enquiry data on OD, wall, and route shortens quotation turnaround for export and domestic Code jobs.

ASME SA789 UNS S39277 is supplied by SHH STEEL as seamless and welded (no filler metal) super duplex tubing under the Section II Part A Code Book product standard, heat-treated per Table 2, tested per Section 9, and certified on EN 10204 3.1 MTCs. Confirm OD × wall, wall basis, manufacture route, and any dual SA-789/A789 marking on the purchase order so stencil and certificate match the datasheet. For technical follow-up, contact admin@steelspecs.com.