ASTM B407 / ASME SB-407 / ASTM B423 / ASME SB-423
Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. manufactures seven grades of Incoloy seamless pipes, 800, 800H, 800HT, 825, 925, Incoloy 028 and Alloy 926, at its plant in Ban Bueng, Chonburi, Thailand, while its office in Bang Phli, Samut Prakan, prepares quotations and certificates. They are made under four ASTM product standards. On a line list the 825 grade reads UNS N08825 seamless pipe, and European drawings show it as seamless WNR 2.4858 pipe.
Incoloy seamless pipeASTM B407 / ASME SB-407 / ASTM B423
EN 10204 3.1 certificate / 3.2 on request
Every grade can be ordered by nominal pipe size and schedule, and every length of every grade passes a hydrostatic or electric test. The governing standard, the delivery condition and the size envelope change with the grade, which is why each item on an inquiry needs its UNS number.
Four ASTM product standards share the family. ASTM B407, Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube, governs UNS N08800, N08810 and N08811, so every ASTM B407 seamless Incoloy pipe on a line list belongs to the 800 group. ASTM B423 governs UNS N08825 in three supply conditions, and an ASTM B423 seamless Incoloy pipe item should state which of them is wanted. ASTM B983 governs UNS N09925, whose only listed condition is solution annealed plus precipitation hardened, and it is quoted without an ASME number. ASTM A312 lists UNS N08028 and UNS N08926 by UNS number and requires both to be furnished solution treated, so Incoloy 028 and Alloy 926 items are ordered to it in that condition. ASME SB-407, ASME SB-423 and ASME SA-312 are the Boiler and Pressure Vessel Code counterparts of B407, B423 and A312. None of the four prints a trade name: each alloy is identified by its UNS number, and that number is entered on the certificate.
B407, B423 and B983 each call up ASTM B829, Standard Specification for General Requirements for Nickel and Nickel Alloys Seamless Pipe and Tube, and what it adds is mostly procedure. It defines a lot as pipe of one heat, one nominal size and one condition, never exceeding 20 000 lb (9100 kg), describes how the hydrostatic and electric tests are run, and lists the marking each length carries. Where a product standard prints its own clause, that clause takes precedence, which is why the 800 group follows B407 rather than B829 for cut length and straightness. ASTM A312 calls up ASTM A999 instead, so Incoloy 028 and Alloy 926 seamless pipes made to A312 follow A999, not B829.
Every length passes either a hydrostatic test or a nondestructive electric test, at our choice unless the order names one, and each lot gets a chemical analysis and, wherever the condition carries strength minimums, a tension test. The 800H and 800HT grades add one grade-specific test per lot, for grain size, while Incoloy 028 and Alloy 926 add a flattening test on pipes from each lot. For Incoloy 028 and Alloy 926 seamless pipe of NPS 10 and larger, the purchaser may, with our agreement, waive the hydrostatic test in favor of a system test, and those lengths are marked NH. Results go on an EN 10204 3.1 (3.2 on request) certificate, and third-party inspection is available on request.
The 800 group shares one standard and divides by carbon control, aluminum and titanium control and heat treatment, while 825 and 925 move to a chemistry bearing molybdenum and copper for corrosive media. Incoloy 028 and Alloy 926, both listed by UNS number in ASTM A312, also carry molybdenum and copper, with nitrogen added in 926. Every seamless Incoloy alloy pipe grade has its own page with chemistry, strength minimums and dimensional data.
Incoloy 800 resists oxidation and carburization. ASTM B407 places it in general service, without the grain-size rule or minimum heat-treatment temperature of the creep grades. Strength minimums for UNS N08800 seamless pipe, or seamless WNR 1.4876 pipe, follow its condition: cold-worked annealed or hot finished. See Incoloy 800 seamless pipes.
Incoloy 800H keeps the 800 chemistry but adds a carbon minimum, and B407 requires a minimum final heat-treatment temperature and a controlled grain size, fitting it for service that needs creep and rupture resistance. European drawings list it as seamless WNR 1.4958 pipe. Details are on Incoloy 800H seamless pipes.
Incoloy 800HT narrows the 800H chemistry: B407 raises its carbon, aluminum and titanium minimums and sets a window for aluminum plus titanium combined. Its minimum final heat-treatment temperature is higher than that of 800H; the grain-size rule and strength minimums are shared. UNS N08811 and its tests are covered on Incoloy 800HT seamless pipes.
Incoloy 825 adds molybdenum and copper for resistance to pitting, chloride stress-corrosion cracking and reducing acids such as sulfuric and phosphoric. ASTM B423 supplies it hot-finished annealed, cold-worked annealed or as hot-forming quality, which is held to chemistry and surface inspection only. Strength rows by condition are listed on Incoloy 825 seamless pipes.
Incoloy 925 is the precipitation-hardenable member, sharing the nickel, chromium, molybdenum and copper limits of 825 with a higher titanium range plus aluminum. ASTM B983 lists it solution annealed plus precipitation hardened, with a hardness ceiling beside its strength minimums. Sour gas well piping is a typical duty; see Incoloy 925 seamless pipes.
Incoloy 028 is a nickel-iron-chromium alloy with molybdenum and copper, listed by UNS number in ASTM A312 / ASME SA-312 as UNS N08028 and supplied solution treated. Its low carbon keeps it resistant to sensitization during welding, and phosphoric and sulfuric acid lines are typical duties. Details are on Incoloy 028 seamless pipes.
Alloy 926 is a high-molybdenum austenitic alloy with nitrogen and copper, listed by UNS number in ASTM A312 / ASME SA-312 as UNS N08926. It resists pitting, crevice corrosion and stress corrosion cracking in chloride media, suiting seawater, firewater and flue gas desulfurization lines. Chemistry and sizes are on Alloy 926 seamless pipes.
Pipe items in the B407, B423 and B983 grades are ordered by nominal pipe size and schedule, the basis each of those standards sets for pipe, and B407 adds a nonmandatory table, published for information only, of the schedules it regards as regularly available for cold-drawn pipe. Across those grades the outside diameter runs up to 457 mm, the wall up to 65 mm and the cut length up to 18 m, and seamless 1.4958 pipe, the 800H grade, is the one among them made beyond that diameter. Alloy 926 is made from 6 to 457 mm outside diameter, with walls from 1 to 65 mm and lengths up to 18 m, while Incoloy 028 is made to the outside diameter, wall thickness and length on each order; both A312 grades can be ordered by nominal pipe size and schedule or by outside diameter and wall. Permitted variations come from B407's own cold-finished table for the 800 group and from the ASTM B829 tables for 825; for 925, B983 prints its own tables for hot-finished pipe and sends precipitation hardened or cold-worked pipe to B829, and for Incoloy 028 and Alloy 926 they come from ASTM A312 and ASTM A999. Ends are plain, cut and deburred, and an order for one of the three B407 grades may instead call for threaded ends or ends beveled for welding, with the details stated. Random lengths are agreed before production. For the B407, B423 and B983 grades, items dimensioned by outside diameter and wall rather than by schedule are usually better placed with our Incoloy seamless tubes.
Incoloy seamless pipes carry heat, oxidizing or carburizing gas, acids, chlorides and sour gas. The sectors below use them in the grades named.
High-temperature heat exchangers and steam generator lines in power plants run in UNS N08810 seamless pipe, the 800H grade, because their design depends on creep and rupture resistance.
Transfer lines for sulfuric or phosphoric acid and other aggressive chemicals use seamless 2.4858 pipe or Incoloy 028, while hot process streams that oxidize or carburize ordinary piping are routed through seamless 1.4876 pipe.
Sour gas wells with high hydrogen sulfide levels take the 825 and 925 grades, and 925 is chosen when the line needs its precipitation hardened condition and higher strength minimums.
Radiant tubes and muffle components inside heat-treating furnaces are made from seamless WNR 1.4876 pipe, which withstands constant flame exposure and heavy thermal loads cycle after cycle.
Seawater piping and offshore platform equipment use seamless WNR 2.4858 pipe, or Alloy 926 for firewater lines, both chosen for resistance to the pitting and crevice corrosion that salt spray and seawater bring.
Scrubber systems that remove sulfur dioxide from industrial exhaust run wet and acidic, so their piping is specified in UNS N08825 seamless pipe to survive the gas cleaning process.
Bundling
Lengths grouped by grade and heat, steel-strapped or packed in timber cases sized for container loading.
Marking
Each length large enough to carry it shows the material name or UNS number, the ASTM specification number, the heat number and the nominal size; smaller pieces are tagged per bundle or box.
Bore protection
Plastic caps fitted to both ends after final inspection.
Documents
Packing list with heat numbers and net and gross weights, sent with the certificate.
Terms
FOB, CFR or CIF, fixed when the order is confirmed.
Destinations
By truck within Thailand and by sea to Singapore, Malaysia, Vietnam, Indonesia, the Philippines and India.
Our plant at 154 Moo.1 Map Phai, Ban Bueng, Chonburi 20170, Thailand, pierces, works, heat treats and tests the full range of Incoloy seamless pipes. Quotations, order confirmations and export papers come from 89/18 Moo.15 Enterprize Park, Bangna-Trad Road, Bang Kaeo, Bang Phli, Samut Prakan 10540, Thailand. An inquiry that mixes seamless 1.4876 pipe with 825 or 925 items is answered in a single offer that marks each line as stock or new production.
No. A mixed order can run under four product standards: the 800, 800H and 800HT items are ASTM B407 seamless Incoloy pipe, the 825 items are ASTM B423 seamless Incoloy pipe, the 925 items follow ASTM B983 and the Incoloy 028 and Alloy 926 items follow ASTM A312. One offer and one certificate set name the standard against every item.
Give the UNS number, standard, nominal pipe size, schedule, condition and cut or random length. For UNS N08800 seamless pipe, state cold-worked annealed or hot finished, because the strength minimums follow that choice. For 825, say whether hot-forming quality is wanted. Add the quantity per item and any third-party inspection the project requires.
One test is per length, the rest per lot. A hydrostatic test holds pressure for at least five seconds; the electric alternative is an eddy current or ultrasonic examination. Per lot come a chemical analysis, a tension test except on hot-forming quality 825, a grain-size test on 800H and 800HT, and a flattening test on Incoloy 028 and Alloy 926.
Let the service decide. Heat with creep and rupture loading points to seamless 1.4958 pipe, the 800H grade with its grain-size control. Sulfuric or phosphoric acid, chlorides and sour gas point to seamless 2.4858 pipe, the 825 grade, whose molybdenum and copper carry that resistance.
An EN 10204 3.1 (3.2 on request) certificate covers every item, giving heat number, standard, condition and test results. Raw material certificates, heat treatment charts and dimensional records accompany it. B407, B423 and B983 each leave certification to the order, so we include it as standard and keep mixed shipments uniform.
Among grades with a fixed size range, 800H goes largest, up to 508 mm outside diameter, while 800, 800HT, 825, 925 and Alloy 926 reach 457 mm. These six run to a 65 mm wall and 18 m cut lengths. Incoloy 028 is made to the dimensions on each order, and every combination is confirmed in the quotation.
Because ASTM B407 sets a grain-size requirement for 800H and 800HT and none for 800. UNS N08810 seamless pipe must be annealed to a controlled, coarse grain size, checked once per lot, and seamless WNR 1.4958 pipe also carries a minimum final heat-treatment temperature. Incoloy 800 has neither rule, since B407 places it in general service.
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