Sulfuric Acid Plant Transfer Piping
Sulfuric acid plants use N08825 for transfer piping and for the lines that serve absorption towers and acid heat exchangers, with the condition and schedule fixed on each line before fabrication starts.
ASTM B423 / ASME SB-423 / UNS N08825 / W.Nr. 2.4858
Incoloy 825 Seamless Pipes Manufacturer in Thailand
ASTM B423 / ASME SB-423 governs every length of the Incoloy 825 seamless pipes that Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. produces at its Ban Bueng, Chonburi plant in UNS N08825, the alloy European drawings list as W.Nr. 2.4858. The grade belongs to our Incoloy seamless pipes range for acid, sour gas and scrubber lines, and each order names one of three supply conditions with different strength outcomes. Quotations and certificates are prepared at our Bang Phli, Samut Prakan office.
Incoloy 825 seamless pipeUNS N08825 / W.Nr. 2.4858
- 6 to 457 mmOutside diameter
- 1 to 65 mmWall thickness
- Up to 18 mLength
- EN 10204 3.1Test certificate
EN 10204 3.1 certificate / 3.2 on request
Specifications of ASTM B423 Incoloy 825 Seamless Pipes
Strength minimums for this grade depend on how a length was finished, so the delivery condition sits next to the NPS and schedule on every line. The table gives the size envelope we quote, the three conditions and the tests attached to each lot.
- Standard
- ASTM B423 / ASME SB-423
- Grade
- 825 (UNS N08825)
- Outside Diameter
- 6 to 457 mm
- Wall Thickness
- 1 to 65 mm
- Length
- Up to 18 mcut to length or random
- Ordering Basis
- Standard pipe size and schedule
- Delivery Condition
- Hot-finished annealedcold-worked annealed or hot-forming quality
- End Type
- Plain endscut and deburred
- Form
- Seamless
- Testing
- Chemical analysis per lot
- Tension test per lot except hot-forming quality
- Hydrostatic or nondestructive electric test on each piece
- Test Certificate
- EN 10204 3.13.2 on request
ASTM B423 is titled Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy Seamless Pipe and Tube, and it covers cold-worked and hot-finished seamless pipe and tube intended for general corrosive service. ASME SB-423 is the related specification for Boiler and Pressure Vessel Code applications. The standard identifies its alloys by UNS number alone, so N08825 is the designation marked on each ASME SB-423 825 seamless pipe and printed on its certificate, while Incoloy 825 remains the commercial name on the requisition. Pipe is ordered by standard pipe size and schedule; Incoloy 825 seamless tubes for exchanger bundles are ordered by outside diameter and wall under a separate tube specification.
Each piece in a lot passes either a hydrostatic test or a nondestructive electric examination, and any length that leaks under hydrostatic pressure is rejected. One chemical analysis and one tension test are made per lot, except that hot-forming quality carries no tension requirement. ASTM B423 leaves certification to the purchase order, and we furnish an EN 10204 3.1 (3.2 on request) material test certificate with every shipment of seamless Incoloy 825 pipe. Independent third-party inspection is available on request.
UNS N08825 Seamless Pipe Chemical Composition
Nickel is held between 38.0 and 46.0%, and iron, set at 22.0% minimum, is determined arithmetically by difference. Chromium at 19.5 to 23.5%, molybdenum at 2.5 to 3.5%, copper at 1.5 to 3.0% and titanium at 0.6 to 1.2% are each controlled as ranges, and ASTM B423 prints no phosphorus limit for this alloy.
- NiNickel, 38.0 to 46.0
- CrChromium, 19.5 to 23.5
- FeIron, 22.0 min
- MoMolybdenum, 2.5 to 3.5
- CuCopper, 1.5 to 3.0
UNS N08825825
| Element | Limit per ASTM B423 / ASME SB-423 (%) |
|---|---|
| Ni (Nickel) | 38.0 to 46.0 |
| Cr (Chromium) | 19.5 to 23.5 |
| Fe (Iron) | 22.0 min |
| Mo (Molybdenum) | 2.5 to 3.5 |
| Cu (Copper) | 1.5 to 3.0 |
| Ti (Titanium) | 0.6 to 1.2 |
| Al (Aluminum) | 0.2 max |
| C (Carbon) | 0.05 max |
| Mn (Manganese) | 1.0 max |
| Si (Silicon) | 0.5 max |
| S (Sulfur) | 0.03 max |
Mechanical Properties of ASME SB-423 825 Seamless Pipe
ASTM B423 divides the tensile minimums for N08825 by supply condition, and one of its three conditions carries no tensile requirement at all.
| Condition | Tensile Strength, min, ksi (MPa) | Yield Strength (0.2% offset), min, ksi (MPa) | Elongation in 2 in. or 50 mm (4D), min (%) |
|---|---|---|---|
| Hot-finished annealed | 75 (517) | 25 (172) | 30 |
| Cold-worked annealed | 85 (586) | 35 (241) | 30 |
| Hot-forming quality (hot-finished or cold-drawn annealed) | Not required | Not required | Not required |
Swipe sideways to see the full table.
Cold-worked annealed pipe holds the higher tensile and yield minimums, so a wall calculated on its figures cannot simply be carried over to a hot-finished annealed length of the same size. Elongation stays at 30% in both annealed rows. Hot-forming quality is furnished to the chemical requirements and a surface inspection only, with no mechanical properties required. For hot-finished annealed and cold-worked annealed pipe, the lot tension result is read against the row the order names.
Equivalent Designations of Incoloy 825
Foreign drawings often call this material by a European or Japanese number. ASTM B423 assigns only the UNS number, so the W.Nr. and JIS entries below serve as cross-references for reading such a callout and do not claim conformity with those national standards.
- Commercial nameIncoloy 825, also written Alloy 825
- ASTM B423 / ASME SB-423 (USA)UNS N08825
- Europe (W.Nr.)2.4858
- Japan (JIS)NCF825
A requisition that quotes 2.4858 or NCF825 is entered against N08825, and the heat is reported against that UNS number.
Seamless WNR 2.4858 Pipe Sizes and Tolerances
Seamless WNR 2.4858 pipe is quoted from 6 mm to 457 mm OD with walls of 1 mm to 65 mm, in lengths up to 18 m, and each line is written as NPS and schedule. Pipe finished hot is held to the hot-worked pipe tolerances that apply under ASTM B423, printed in four bands from 1 in. (25 mm) to 9 1/4 in. (235 mm) OD:
| Nominal OD, in. (mm) | OD Tolerance, in. (mm) | Wall Tolerance, Nominal Wall | Wall Tolerance, Minimum Wall |
|---|---|---|---|
| 1 (25) to 1.900 (48), incl | +0.015 (0.40) / -0.031 (0.79) | +16.0% / -12.5% | +28.5% / 0 |
| Over 1.900 (48) to 4 1/2 (114), incl | ±0.031 (0.79) | +16.0% / -12.5% | +28.5% / 0 |
| Over 4 1/2 (114) to 6 1/2 (165), incl | ±0.047 (1.2) | +16.0% / -12.5% | +28.5% / 0 |
| Over 6 1/2 (165) to 9 1/4 (235), incl | ±0.062 (1.6) | +16.0% / -12.5% | +28.5% / 0 |
Swipe sideways to see the full table.
Up to 5 in. (127 mm) OD, individual diameter readings include ovality. Above that size the mean diameter must fall within the table, and no single reading may vary by more than twice the tabulated figure. The hot-worked pipe table prints no band below 1 in. (25 mm) or above 9 1/4 in. (235 mm) OD, so if a size outside those bands is ordered finished hot, its diameter and wall limits are agreed and written into the quotation. Pipe finished cold is held to a separate, size-graded set of diameter and wall limits, generally closer than these, and the quotation states them for each line.
Cut Length, Straightness and Ends
A length ordered cut to length may not be shorter than the figure ordered. Below 2 in. (50.8 mm) OD it may run up to 1/8 in. (3.2 mm) long, and from 2 in. upward up to 3/16 in. (4.8 mm) long, for lengths up to 24 ft (7.3 m). Longer cuts gain a further 1/8 in. (3.2 mm) for each 10 ft (3 m) or part of it, to a maximum of 1/2 in. (12.7 mm) extra. Random lengths are agreed when the order is placed. Pipe leaves the mill reasonably straight and free of bends and kinks, with plain ends cut and deburred.
Delivery Conditions and Finishes for Alloy 825 Seamless Pipe
ASTM B423 recognizes hot-finished annealed, cold-worked annealed and hot-forming quality for N08825 and prints no annealing temperature for any of them. Its nonmandatory appendix describes the finishes each route normally delivers:
Cold-worked, annealed, with ground outside diameter: 1/2 to 4 in. (12.7 to 102 mm), in normal and heavy-wall sizes and in pipe sizes of all schedules.
Cold-worked, annealed and pickled, not ground: 1/2 to 6 5/8 in. (12.7 to 168 mm).
Pipe finished hot: the appendix lists hot-worked finishes for tube only, so the surface of hot-finished pipe is agreed with us when the order is placed.
The finish and the condition are written together on each line of an Alloy 825 seamless pipe order.
Choosing Seamless Incoloy 825 Pipe Against 925 and 904L
Incoloy 925 seamless pipes share the nickel, chromium, iron, molybdenum and copper windows of N08825 but come under their own product standard, with titanium at 1.90 to 2.40% against 0.6 to 1.2%, aluminum at 0.10 to 0.50% against a 0.2% maximum, carbon at 0.03% maximum against 0.05%, and up to 0.50% niobium. They are supplied solution annealed plus precipitation hardened, a condition outside the three that ASTM B423 lists for 825.
Where a duty does not call for a nickel alloy at all, stainless steel 904L seamless pipes are the lower-alloy option in our range. A line specified to UNS N08825 stays on seamless Incoloy 825 pipe.
Industrial Applications of Seamless Nickel Alloy 825 Pipe
Seamless nickel alloy 825 pipe runs acid production and transfer lines, sour gas flowlines, scrubber circuits and the process piping around pickling and evaporation units.
Phosphoric and Nitric Acid Production Lines
Wet-process phosphoric acid units run the alloy in evaporator circuits and slurry piping, and nitric acid production plants take the same grade for their process transfer lines.
Sour Gas Flowlines
Oil and gas recovery puts the grade into flowlines and well piping that carry hydrogen sulfide, where each length is ordered by NPS, schedule and condition and its lot certificate travels with it.
Flue Gas Desulfurization Scrubber Piping
Flue gas desulfurization scrubbers in pollution control plants take the alloy for their process piping, and waste heat recovery systems in the same plants use it as well.
Pickling and Chemical Process Lines
Pickling lines and chemical plants use the grade for the piping that feeds pickling tanks, reactors and evaporators, with cut lengths ordered against the piping isometrics.
Shipping and Packaging of Seamless 2.4858 Pipe
Packing
Lengths finished hot are strapped in bundles on timber skids, and ground or pickled cold-worked lengths travel in wooden cases with an end protector on each piece.
Marking
Each seamless 2.4858 pipe of 3/4 in. (19.0 mm) OD and larger and over 3 ft (914 mm) long carries the manufacturer's name, UNS N08825, the letters ASTM with B423, the heat number and the nominal size; smaller or shorter pieces are tagged by bundle or box.
Documents
EN 10204 3.1 (3.2 on request) material test certificate, with a packing list for each bundle or case.
Terms
FOB, CIF or CFR, with the loading port named in the offer.
Timing
The production slot and ship date are confirmed on the order acknowledgement.
Seamless Alloy 2.4858 Pipe Price per kg
Seamless alloy 2.4858 pipe is indicatively priced at USD 20 to 45 per kg. The nickel market sets most of where a quotation lands, with molybdenum and copper contributing to a smaller degree. Delivery condition, OD, wall and length then fix the processing cost per kilogram, and small lots, cut lengths or added testing and inspection move a figure toward the top of the band. Send the NPS, schedule, condition and quantity for each line to receive a firm price.
Indicative price, Incoloy 825 Seamless Pipes
USD 20 to 45 per kg
Indicative only. Send your sizes and specification to Thaida for a firm quotation.
- Outside diameter
- Wall thickness
- Schedule
- Length
- Quantity
- Testing and certification
- Nickel price
- Molybdenum price
- Copper price
Thaida Plant, Office and Export Markets
Incoloy 825 seamless pipes are made at 154 Moo.1 Map Phai, Ban Bueng, Chonburi 20170, Thailand, and quotations, certificates and shipping papers are issued from 89/18 Moo.15 Enterprize Park, Bangna-Trad Road, Bang Kaeo, Bang Phli, Samut Prakan 10540, Thailand. Projects within Thailand are supplied directly, and we export to Singapore, Malaysia, Vietnam, Indonesia, the Philippines and India.
Factory154 Moo.1 Map Phai, Ban Bueng,
Chonburi 20170, Thailand
Chonburi 20170, Thailand
Office89/18 Moo.15 Enterprize Park, Bangna-Trad Road,
Bang Kaeo, Bang Phli, Samut Prakan 10540, Thailand
Bang Kaeo, Bang Phli, Samut Prakan 10540, Thailand
Exporting to
- Singapore
- Malaysia
- Vietnam
- Indonesia
- Philippines
- India
Incoloy 825 Seamless Pipe FAQ
Which ASTM B423 delivery condition should the order name?
Cold-worked annealed, wherever the wall is calculated on strength: it carries 85 ksi (586 MPa) tensile and 35 ksi (241 MPa) yield minimums. Hot-finished annealed is held to 75 ksi (517 MPa) and 25 ksi (172 MPa), with the same 30% elongation. Name the condition on every line, because the certificate is read against that row.
When does hot-forming quality suit an N08825 order?
Only when the design does not rely on the ASTM B423 tensile minimums. Hot-forming quality is supplied hot-finished or cold-drawn annealed, to the chemical requirements and a surface inspection, with no tensile, yield or elongation minimums. For pressure lines sized on yield strength, order hot-finished annealed or cold-worked annealed instead, so a lot tension result appears on the certificate.
Should pipe finished hot be ordered on nominal or minimum wall?
On minimum wall when the pressure design uses the minimum thickness. A minimum-wall order accepts nothing below the stated figure and up to 28.5% above it, while a nominal-wall order allows a length to run 16.0% heavy or 12.5% light. Both limits apply from 1 in. (25 mm) to 9 1/4 in. (235 mm) OD.
How does Incoloy 825 compare with Incoloy 925 where a line needs more strength?
925 carries much higher minimums in its listed condition, solution annealed plus precipitation hardened: 140 ksi (965 MPa) tensile, 110 ksi (758 MPa) yield and 18% elongation. Cold-worked annealed 825 offers 85 ksi (586 MPa) and 35 ksi (241 MPa) with a 30% elongation minimum, suiting lines where the yield demand is lower.
What counts as one test lot on an ASTM B423 order?
Pipe from one heat, of one nominal size (length aside) and in one condition, and from one furnace charge when annealing is done in a batch furnace. The mill chooses between the hydrostatic and the electric test on each piece unless the purchase order names one, so write it in if your inspection plan fixes the method.
What does the certificate for an ASTM B423 order report?
The heat analysis against the ASTM B423 chemistry limits, the lot tension result against the condition you ordered (none for hot-forming quality), and confirmation of the hydrostatic or electric test on each piece. It is issued as EN 10204 3.1 (3.2 on request), and its heat number matches the marking on the pipe.
How should each line of an N08825 order be written?
By NPS and schedule first, followed by the delivery condition, cut or random length, quantity and certificate level. We quote outside diameters from 6 to 457 mm and walls from 1 to 65 mm, in lengths up to 18 m, and every line is checked against that envelope in the quotation.
Request a Quote for Incoloy 825 Seamless Pipes
or email sales@thaida.co.th