ASTM B407 / ASME SB-407 / ASTM B163 / ASME SB-163
Seven Incoloy grades, 800, 800H, 800HT, 825, 925, Incoloy 028 and Alloy 926, are produced as Incoloy seamless tubes by Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. in Ban Bueng, Chonburi, Thailand, while quotations and test certificates are issued from our office in Bang Phli, Samut Prakan. Each grade follows the tube standard that fits its duty: a superheater bundle specified as UNS N08810 seamless tube, or seamless WNR 1.4958 tube, is made to ASTM B407 with a controlled grain size.
Incoloy seamless tubeASTM B407 / ASME SB-407 / ASTM B163
EN 10204 3.1 certificate / 3.2 on request
Grade decides the product standard, the delivery condition and any extra test on a seamless Incoloy tube order, and for 925 it also lowers the diameter ceiling. Ordering by diameter and wall and the test on every tube are shared by all seven grades.
Four product standards cover the family, and the duty a tube is bought for decides which one applies.
| Duty | Grade | Standard | Grade-specific control |
|---|---|---|---|
| General high-temperature service, oxidation and carburization | 800 (UNS N08800) | ASTM B407 / ASME SB-407 | Strength minimums set by condition |
| Service needing creep and rupture resistance | 800H (UNS N08810), 800HT (UNS N08811) | ASTM B407 / ASME SB-407 | Controlled grain size, tested per lot; minimum final heat-treatment temperature |
| Condenser and heat-exchanger tube | 825 (UNS N08825) | ASTM B163 / ASME SB-163 | Annealed only; flare test per lot |
| Precipitation-hardened tube | 925 (UNS N09925) | ASTM B983 | Hardness ceiling beside the strength minimums |
| Acid evaporator and seawater-cooled exchanger tube | Incoloy 028 (UNS N08028), Alloy 926 (UNS N08926) | ASTM A213 / ASME SA-213 | Listed by UNS number; flattening and flaring per lot; hardness limit for N08926 |
Swipe sideways to see the full table.
ASTM B407, Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube, places UNS N08800 in general service and UNS N08810 and N08811 in service where creep and rupture resistance is required. Of the three, only those two must be annealed to a controlled grain size and reach a minimum final heat-treatment temperature, so an ASTM B407 seamless Incoloy tube ordered for creep and rupture service is specified as 800H or 800HT.
ASTM B163, Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes, is the standard we use for UNS N08825 seamless tube. It lists the grade annealed only, prints its own tolerance table and cut-length rule, and adds a flare test on each lot, a test that neither B407 nor B983 requires.
ASTM B983, Standard Specification for Precipitation Hardened or Cold Worked, Seamless Nickel Alloy Pipe and Tube, covers UNS N09925. The only condition it lists for the grade is solution annealed plus precipitation hardened, its property table sets a hardness ceiling beside the strength minimums, and it is quoted without an ASME number.
ASTM A213, the seamless boiler, superheater and heat-exchanger tube standard, lists UNS N08028 and N08926 by number, with no grade name, and is quoted as ASME SA-213 for code work. It calls for a product analysis on every heat and for flattening and flaring tests on two different tubes of each lot, and it adds a hardness limit for N08926, checked on two tubes per lot.
ASTM B829, Standard Specification for General Requirements for Nickel and Nickel Alloys Seamless Pipe and Tube, fills the gaps the three B-standards leave. For tube in the 800 group and in 925, it defines the lot as one heat, one nominal size and one condition, sets out how the hydrostatic and electric tests are run and lists the marking. B163 writes its own lot, hydrostatic, length and marking clauses, and a product standard's own clause always governs. Incoloy 028 and Alloy 926 seamless tubes made to ASTM A213 take their general requirements from ASTM A1016 instead.
Each tube passes a hydrostatic test or a nondestructive electric test, chosen by us unless the order names one, and a tube that leaks is rejected. Every lot gets a chemical analysis and a tension test, 800H and 800HT add a grain-size test, 825 adds a flare test, and Incoloy 028 and Alloy 926 add flattening and flaring tests, with a hardness test for Alloy 926. Results are reported on an EN 10204 3.1 (3.2 on request) certificate, and third-party inspection is available on request.
The 800 group shares ASTM B407 and divides by carbon, aluminum and titanium control and by heat treatment, while 825 and 925 add molybdenum and copper for corrosive media. Incoloy 028 and Alloy 926 complete the range, both made to ASTM A213, which lists them by UNS number. Each grade has its own page with chemistry, strength minimums and dimensional data.
Incoloy 800 resists oxidation and carburization, and ASTM B407 places it in general service with no grain-size rule. Its strength minimums follow the condition, cold-worked annealed or hot finished, and a hot-finished seamless 1.4876 tube is held to B407's hot-finished bands. Read more on Incoloy 800 seamless tubes.
Incoloy 800H keeps the aluminum and titanium limits of 800 but adds a carbon minimum. B407 then requires a controlled grain size, checked once per lot, and a minimum final heat-treatment temperature, which suits it to tube bundles and boiler tubing loaded in creep. Grade data are on Incoloy 800H seamless tubes.
Incoloy 800HT tightens the 800H chemistry further. B407 lifts its carbon, aluminum and titanium minimums and adds a range for aluminum plus titanium combined, and its final heat treatment must reach a higher minimum than that of 800H, while grain size and strength rows are shared. See Incoloy 800HT seamless tubes.
Incoloy 825 adds molybdenum, copper and titanium to the nickel-iron-chromium base for resistance to pitting, crevice corrosion and reducing acids. For condenser and heat-exchanger duty we supply it as ASTM B163 seamless Incoloy tube, annealed, and it is the one B-standard grade whose lots carry a flare test. Details are on Incoloy 825 seamless tubes.
Incoloy 925 is the precipitation-hardenable grade: it keeps the nickel, chromium, molybdenum and copper ranges of 825 but carries more titanium and a minimum aluminum content. ASTM B983 lists only the solution annealed plus precipitation hardened condition, pairing strength minimums with a hardness ceiling. Deep sour-gas well tubing is typical; see Incoloy 925 seamless tubes.
Incoloy 028 is a nickel-iron-chromium alloy with molybdenum and copper, listed by its UNS number, N08028, in ASTM A213. Each heat receives a product analysis, and each lot is checked by flattening one tube and flaring another. Phosphoric acid evaporators and acid-service condensers are typical duties; see Incoloy 028 seamless tubes.
Alloy 926 is a high-molybdenum austenitic alloy with nitrogen and copper, listed by UNS number in ASTM A213 as N08926. Unlike Incoloy 028, it carries an A213 hardness limit, read on two tubes per lot. Seawater-cooled exchangers, condensers and brine heaters use it; grade data are on Alloy 926 seamless tubes.
In 800, 800H, 800HT and 825 the outside diameter runs up to 457 mm, the wall up to 65 mm and the cut length up to 22 m. Seamless Incoloy 925 tube is made from 6.35 to 257 mm outside diameter with the same wall range. Alloy 926 is made from 6 to 457 mm outside diameter and 1 to 65 mm wall, in lengths up to 18 m. Incoloy 028 is made to the outside diameter, wall thickness and length each order states. Tube is ordered by dimensions, not by schedule. ASTM B407 takes two dimensions, length excepted: outside diameter with average or minimum wall, inside diameter with average wall, or outside and inside diameter. ASTM B983 asks for outside diameter, minimum or average wall and length, and ASTM A213 sizes a tube by outside diameter and minimum wall unless the order names average wall.
Permitted variations come from each product standard's own table, or, for Incoloy 028 and Alloy 926, from ASTM A1016, with A213's own limits for average-wall orders. B407 prints bands for cold-finished and for hot-finished tube, so a seamless WNR 1.4876 tube is checked against the band for its route; B163 prints bands for the smaller heat-exchanger sizes of UNS N08825 seamless tube; and B983 prints hot-finished tube bands, sending precipitation hardened or cold-worked tube to ASTM B829. A cut length is never shorter than ordered, with a small plus allowance set by the standard. ASTM B163 also offers U-bent and coiled tube as supplementary requirements, applied only when an order invokes them. Lines sized by nominal pipe size and schedule belong with our Incoloy seamless pipes.
Incoloy seamless tubes carry heat into and out of process streams, and the sectors below use them in the grades named.
Superheater and reheater tubing in steam boilers runs in seamless WNR 1.4958 tube, the 800H grade, because its controlled grain size suits service that needs creep and rupture resistance.
Shell-and-tube bundles handling sulfuric or phosphoric acid in chemical plants use UNS N08825 seamless tube, while heat exchangers and condensers in food and dairy processing are built from seamless WNR 1.4876 tube.
Radiant tubes and muffles in heat-treatment furnaces are made from UNS N08800 seamless tube, which resists oxidation and carburization, and from the 800H grade for other furnace components.
Pyrolysis tubing in cracking furnaces uses seamless 1.4958 tube, and reformer piping and heat exchangers in petrochemical plants use seamless 1.4876 tube.
Tank heaters and heating coils in acid production and pickling use seamless 2.4858 tube, and heaters in sulfuric and nitric acid processes also run in the 800HT grade.
Downhole casing and tubing strings in deep sour-gas wells use the 925 grade, and wellhead tubing in sour gas service runs in seamless WNR 2.4858 tube.
Flue gas desulfurization scrubbers use seamless WNR 2.4858 tube, while digester liquor heaters in pulp and paper mills use the 800H grade.
Bundling
Tubes grouped by grade, heat and size; small-bore and thin-wall tube packed in timber cases to prevent bending.
Marking
Tubes in the 800 group and in 925 carry the material name or UNS number, the ASTM specification number, the heat number and the nominal size, with smaller pieces tagged per bundle; 825 bundles carry the B163 container marking, including condition, size, weights and order number; Incoloy 028 and Alloy 926 seamless tubes also state hot or cold finish and minimum or average wall.
End protection
Each tube capped at both ends to keep the bore clean in transit.
Paperwork
A packing list stating heat numbers, piece counts and net and gross weights travels with the certificate.
Incoterms
FOB, CFR or CIF, agreed at order confirmation.
Delivery
Road transport within Thailand and sea freight to Singapore, Malaysia, Vietnam, Indonesia, the Philippines and India.
Tube is pierced, worked, drawn, heat treated and tested at our plant, 154 Moo.1 Map Phai, Ban Bueng, Chonburi 20170, Thailand. Our office at 89/18 Moo.15 Enterprize Park, Bangna-Trad Road, Bang Kaeo, Bang Phli, Samut Prakan 10540, Thailand, issues quotations, order confirmations and export documents for Incoloy seamless tubes. One offer can combine tube items in all seven grades, each marked as stock or new production.
Yes, on one order that runs under two standards. The 800H items are made as ASTM B407 seamless Incoloy tube. The 825 items are ASTM B163 seamless Incoloy tube and alone receive the flare test. We send one offer and one certificate set, naming the standard, condition and lot tests against every item.
State the UNS number, condition, outside diameter, wall, length and quantity, and say whether the wall is average or minimum. Under ASTM B407 a tube is ordered in two dimensions only, so outside and inside diameter may replace diameter and wall. For UNS N08800 seamless tube, name cold-worked annealed or hot finished, because strength minimums follow it.
825, Incoloy 028 and Alloy 926. ASTM B163 requires it on every 825 lot: a sampled end is expanded on a conical tool to a set diameter increase and must show no crack through the wall. For the other two, A213 flares one tube per lot. The 800 group and 925 rely on hydrostatic or electric tests and tension tests.
By one test per lot, to ASTM E112, using the planimetric, comparison or intercept method, with the intercept method as referee. A lot is annealed tube of one heat, one size and one condition, so each new heat or size of seamless 1.4958 tube gets its own check. Incoloy 800 has no grain-size requirement.
Let the medium decide. Sulfuric or phosphoric acid, pitting and crevice attack point to seamless 2.4858 tube, the 825 grade, made to the condenser and heat-exchanger standard. Hot gas with creep and rupture loading points to UNS N08810 seamless tube, the 800H grade, annealed to a controlled grain size.
Yes, as order options rather than defaults. ASTM B163 provides supplementary requirements for U-bent tube and for coiled or unstraightened tube, and they apply only when the order invokes them. Give the bend radii and leg lengths, or the coil requirement, with the inquiry, and the offer states how each item will be supplied.
800, 800H, 800HT and 825 reach 457 mm outside diameter, 65 mm wall and 22 m length; 925 runs from 6.35 to 257 mm outside diameter with the same wall range. Alloy 926 runs from 6 to 457 mm outside diameter, 1 to 65 mm wall and up to 18 m. Incoloy 028 is made to the ordered dimensions.
An EN 10204 3.1 (3.2 on request) certificate for every item, giving heat number, standard, condition and test results. ASTM B407, B163 and B983 each leave certification to the order, so we include it as standard. Raw material certificates, heat treatment charts and size measurement records go with it.
Request a Quote for Incoloy Seamless Tubes
or email sales@thaida.co.th
