ASTM B165 / ASME SB-165 / ASTM B163 / ASME SB-163
Monel seamless tubes are manufactured by Thaida Stainless Steel Manufacturing (Thailand) Co., Ltd. at its plant in Ban Bueng, Chonburi, Thailand, in two nickel-copper alloys, Monel 400 and Monel K500, with quotations and certificates issued from our office in Bang Phli, Samut Prakan. Duty sets the route: a UNS N04400 seamless tube for process lines is made to ASTM B165, the same alloy goes to ASTM B163 for condenser bundles, and a seamless WNR 2.4375 tube in K500 is defined by the purchase order.
Monel seamless tubeASTM B165 / ASME SB-165 / ASTM B163
EN 10204 3.1 certificate / 3.2 on request
Grade and duty decide the standard, the delivery condition and the tests on a seamless Monel tube order. The size envelope, ordering by outside diameter and wall, and the EN 10204 3.1 (3.2 on request) certificate are the same for both grades.
Monel 400 can be ordered as a seamless nickel copper alloy tube under two ASTM standards and Monel K500 under none, so the duty a tube is bought for decides the route.
| Duty | Grade | Route | What the route adds |
|---|---|---|---|
| Process lines, heating coils and general corrosion service | Monel 400 (UNS N04400) | ASTM B165 / ASME SB-165 | Cold-worked tube, annealed or stress-relieved; certification and test report mandatory |
| Condenser and heat-exchanger bundles | Monel 400 (UNS N04400) | ASTM B163 / ASME SB-163 | Flare test; own tolerance table; U-bent tube as a supplementary order option |
| Duty that also needs higher strength | Monel K500 (UNS N05500) | Purchase order | Chemistry, condition, tests and tolerances agreed item by item |
Swipe sideways to see the full table.
ASTM B165, Standard Specification for Nickel-Copper Alloy Seamless Pipe and Tube, covers UNS N04400 as cold-worked seamless pipe and tube, annealed or stress-relieved. Every tube passes a hydrostatic test or a nondestructive electric test, chosen by us unless the order names one, and each lot gets a chemical analysis and a tension test. B165 makes a manufacturer's certification and a report of the test results mandatory, so every ASTM B165 seamless Monel tube ships with both.
ASTM B163, Standard Specification for Seamless Nickel and Nickel Alloy Condenser and Heat-Exchanger Tubes, lists UNS N04400 as its only nickel-copper alloy, annealed or stress-relieved. Written for condenser and heat-exchanger service in the smaller, lighter-wall exchanger sizes, it prints its own tolerance table and cut-length rule, and adds a flare test on a sample from each lot to the hydrostatic or electric test that every tube receives. An ASTM B163 seamless Monel tube can also be ordered U-bent, a supplementary requirement that applies only when the order invokes it.
UNS N05500 appears in neither standard, and no ASTM seamless tube specification lists it. A seamless 2.4375 tube is therefore made to the purchase order, which takes the place of a standard and sets what the EN 10204 3.1 (3.2 on request) certificate reports.
ASTM B829, Standard Specification for General Requirements for Nickel and Nickel Alloys Seamless Pipe and Tube, lists B165 and B163 among the product standards it serves. For Monel 400 its main contribution is the nondestructive electric test, run as eddy current or ultrasonic examination, while B165 and B163 keep their own lot, test, certification and marking clauses, and a product standard's own clause always governs.
Both grades share the nickel-copper base, and K500 adds aluminum and titanium so that it can be age hardened. Each grade has its own page with chemistry, condition and ordering details.
Monel 400 is the solid-solution grade, hardened only by cold work and supplied annealed or stress-relieved. It resists hydrofluoric acid, alkalis and rapidly flowing brackish water or seawater. Both ASTM tube standards list UNS N04400, so a seamless 2.4360 tube can be ordered for process lines or exchanger bundles. See Monel 400 seamless tubes.
Monel K500 adds aluminum and titanium to the nickel-copper base, which allows age (precipitation) hardening; age hardened, it is considerably stronger and harder than Monel 400, with similar corrosion resistance. A UNS N05500 seamless tube is supplied solution-treated and age-hardened to the purchase order. Details are on Monel K500 seamless tubes.
Both grades are made up to 457 mm outside diameter and 65 mm wall, in lengths up to 22 m. Tube is ordered by outside diameter and wall, not by schedule: ASTM B165 asks for the outside diameter with a nominal or minimum wall, and for cut or random length. Its own tolerance table for cold-worked tube covers only part of that size range. ASTM B163 prints separate bands for average and minimum wall on the condenser sizes it covers. For a seamless WNR 2.4375 tube, the outside diameter, wall and tolerances are agreed on the order. Lines sized by nominal pipe size and schedule belong with our Monel seamless pipes.
Monel seamless tubes in the 400 grade serve the acid, heating and exchanger duties below, while the K500 grade is chosen where a line also needs higher strength.
Alkylation units making high-octane gasoline use UNS N04400 seamless tube to handle and transfer sulfuric and hydrofluoric acids, and perchloroethylene and chlorinated plastics plants use it against chlorine and chloride compounds.
Hot, corrosive vapors and crude fractions leaving refinery distillation columns run through the 400 grade, and reboilers that concentrate MEA solution for gas sweetening use it as heat-exchanger tubing.
Heating coils submerged in hot acid pickling baths, brine heaters for saline water and seawater scrubbers that clean flue gases are built from seamless WNR 2.4360 tube.
Power plants carry hot feedwater and raise steam in seamless 2.4360 tube, while condenser tubes and heat exchangers in power generation also run in the K500 grade.
Downhole tubes and instrumentation lines exposed to sour gas, hydrogen sulfide and acidic conditions use seamless 2.4375 tube, where the age-hardened grade adds strength to nickel-copper corrosion resistance.
Seawater pipes and the condensers of ship systems use UNS N05500 seamless tube, and the 400 grade serves lines carrying rapidly flowing brackish water or seawater.
Heat exchanger tubes handling acids, alkalis and reactive vapors, and instrumentation lines in corrosive process streams, use the K500 grade, which also forms digester tubes in pulp and paper mills.
Bundling
Each bundle holds one grade, one heat and one size; thin-wall and small-bore lengths travel in timber cases so they stay straight.
Marking
Material name or UNS number, heat number, condition, specification number and size, on the tube or on a label or tag fixed to the bundle; K500 items marked as the order states.
End protection
Caps fitted to both ends keep every bore clean on the way.
Packing list
Heat numbers, number of pieces and net and gross weights, sent with the certificate.
Incoterms
FOB, CFR or CIF, fixed when the order is confirmed.
Delivery
Road transport within Thailand and sea freight to Singapore, Malaysia, Vietnam, Indonesia, the Philippines and India.
Our plant at 154 Moo.1 Map Phai, Ban Bueng, Chonburi 20170, Thailand, extrudes, cold draws, heat treats and tests both grades. Quotations, order confirmations and export papers for Monel seamless tubes come from our office at 89/18 Moo.15 Enterprize Park, Bangna-Trad Road, Bang Kaeo, Bang Phli, Samut Prakan 10540, Thailand. A single offer can mix ASTM B165, ASTM B163 and purchase-order items, each carrying its own test list.
ASTM B163 / ASME SB-163, when the tubes fall within its diameter and wall scope, because its tolerance table and flare test are written for condenser and heat-exchanger service. Larger or heavier-wall tubes, heating coils and process lines are ordered as ASTM B165 seamless Monel tube. Both list UNS N04400, so only the standard on the order changes.
The grade and UNS number, the route (ASTM B165, ASTM B163 or purchase order), the condition, the outside diameter, the wall and whether it is nominal, average or minimum, cut or random length, and the quantity in length or pieces. Name hydrostatic or electric testing if you need one of them; under ASTM B165 the choice is otherwise ours.
Yes, as an ASTM B163 seamless Monel tube ordered with its U-bent supplementary requirement. Send the bend radii and leg lengths for each row of the bundle, together with the outside diameter and wall, and the offer confirms every U-bent item against your bundle drawing.
The purchase order becomes the specification. It names UNS N05500, the chemistry limits, the condition (normally solution-treated and age-hardened), the outside diameter and wall with agreed tolerances, the length and the tests, chosen from eddy current, ultrasonic, hydrostatic and PMI. Each item is then reported against those terms on the EN 10204 3.1 (3.2 on request) certificate.
Use Monel 400 unless the tube must also be stronger and harder. Where corrosion resistance is the whole requirement, as in heating coils, brine heaters or acid transfer, the 400 grade ordered as seamless WNR 2.4360 tube is enough and comes with an ASTM standard. In downhole lines, K500 adds age-hardened strength with similar corrosion resistance.
An EN 10204 3.1 (3.2 on request) certificate for every item, giving heat number, standard or order basis, condition and test results, for ASTM B165, ASTM B163 and K500 items alike. Raw material certificates, heat treatment charts, surface roughness and size measurement records go with it, and third-party inspection is available on request.
Up to 22 m, in either grade, cut to the ordered length or in random lengths as the order states. Under ASTM B165 a cut length is never shorter than ordered: the standard allows only a small plus variation, which grows in steps on very long tubes. Each length is confirmed item by item in the quotation.
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