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ASTM B729 Seamless Nickel-Iron-Chromium-Molybdenum-Copper Nickel Alloy Pipe and Tube

ASTM B729 is the standard specification for seamless tubes and pipes made from UNS N08020, N08024, and N08026 alloys. These are commonly known as "Alloy 20" stainless steels, but they are technically nickel-iron-chromium alloys with significant additions of molybdenum and copper, making them exceptionally resistant to sulfuric acid and other aggressive corrosives.

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Products Description

We produce ASTM B729 UNS N08020 Seamless Pipe in a wide range of sizes, pipes are finished in cold worked or hot finished process, with bright annealed or pickled surface finishes, UNS N08020 tubes and pips are manufactured according to ASTM B729 specification, the standard specifies technical requirements and delivery conditions for manufacturers and purchaser, the equivalent is ASME SB729, the UNS N08020 alloy is also called Alloy 20.

ASTM B729 alloy 20 pipes have excellent corrosion resistance and properties for use in general corrosive service, nickel alloy 20 pipe diameter from 1/8 inch to 30 inch, pipe schedule from sch 5 to sch 160, ASTM B729 Alloy UNS N08020 seamless tube can be produced in metric sizes from 6 to 610 mm.

ASTM B729 UNS N08020 Pipe Specifications

Standard	ASTM B729, ASME SB729
Type	Seamless Tube, Seamless Pipe
Alloy	UNS N08020, alloy 20
Finishing	Annealing Pickling, Bright Annealing
Outside Diameter	6 – 610 mm
Thickness	0.5 – 30 mm

ASTM B729 UNS N08020

ASTM B729 UNS N08020 material is a nickel-chromium-molybdenum alloy added 32.0-38.0% nickel, 19.0-21.0% chromium, 2.0-3.0% molybdenum and 3.0-4.0% copper, these elements in UNS N08020 provide excellent corrosion resistance in chemical environments containing sulfuric acid, and useful resistance to environments containing chlorides, nitric acid, and phosphoric acid.

Alloy 20 Chemical Composition

Grade	UNS	C≤	Mn≤	P≤	S≤	Si≤	Ni	Cr	Mo	Cu
Alloy 20	N08020	0.07	2.00	0.045	0.035	1.00	32.0-38.0	19.0-21.0	2.0-3.0	3.0-4.0

Alloy 20 Mechanical Properties

Mechanical properties	Tensile, min, ksi[MPa]	Yield, min, ksi[MPa]	Elongation, %(min)
Alloy 20	80[550]	35[240]	30

Alloy 20 Density

Properties	Metric	Imperial
Density	8.05 g/cm3	0.291 lb/in3

UNS N08020 Equivalent

WERKSTOFF NR.	UNS	AFNOR	EN
Alloy 20	2.4660	N08020	Z2NCUD31-20AZ	NiCr20CuMo

ASTM B729 UNS N08020 Pipe Applications

Other uses include the production of gasoline, solvents, explosives, inorganic and organic chemicals, pharmaceuticals, and food and synthetic materials. INCOLOY alloy 20 is readily fabricated to produce mixing tanks, heat exchangers, process piping, pickling equipment, pumps, valves, fasteners and fittings.

Applications for alloy 20 requiring resistance to aqueous corrosion are essentially the same as those for INCOLOY alloy 825.

ASTM B729 Specification

Standard Specification for Seamless Nickel-Iron-Chromium-Molybdenum-Copper Nickel Alloy Pipe and Tube

ASTM B729 specification covers UNS N08020, UNS N08026 and UNS N08024 nickel-alloy seamless, cold-worked or hot-finished pipe and tube intended for general corrosive service.

The pipe of UNS N08020 alloy, UNS N08026 alloy, and UNS N08024 alloy shall be furnished in the stabilized-annealed condition, solution-annealed condition, and annealed condition, respectively.

The recommended annealing temperatures all followed by quenching in water or rapidly cooling by other means are as follows: 1800 to 1850°F (982 to 1010°C) for UNS N08020, 2050 to 2200°F (1121 to 1204°C) for UNS N08026, and 1925 to 1975°F (1052 to 1079°C) for UNS N08024.

The tensile strength, yield strength, and elongation requirements are specified. Hydrostatic and nondestructive electric tests shall be conducted on each pipe or tube.

Chemical Analysis-One test per lot.

Mechanical Properties-One test per lot.

Hydrostatic or Nondestructive Electric Test-Each piece in each lot.

UNS N08020 Specifications

INCOLOY alloy 20 is designated as UNS N08020. Standard product forms include pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire.

Rod, Bar, Wire and Forging – ASTM B 462 ASTM B 472, ASTM B 473, ASME SB 472, ASME SB 473, ISO 9723, ISO 9724, ISO 9725, DIN 17752-17754

Plate, Sheet and Strip – ASTM A 240, ASTM A 480, ASTM B 463, ASTM B 906, ASME SA 240, ASME SA 480, ASME SB 463, ASME SB 906, ISO 6208, DIN 17750

Pipe and Tube – ASTM B 729, ASTM B 829, ASTM B 468, ASTM B 751, ASTM B 464, ASTM B 775, ASTM B 474, ASME SB 729, ASME SB 829, ASME SB 468, ASME SB 751, ASME SB 464, ASME SB 775, ASME SB 474, ISO 6207, DIN 77751

Other – DIN 17744, ASTM B 366, ASTM B 462, ASTM B 471, ASTM B 475, ASME SB 366, ASME SB-462, ASME SB 471, ASME SB 475

Alloys Covered by ASTM B729

The standard covers three specific UNS (Unified Numbering System) grades, which are nuanced variations of the "Alloy 20" family.

UNS Number	Common Name	Key Distinction
N08020	Alloy 20 (Carpenter 20)	The original, standard grade.
N08024	Alloy 20Cb-3	Enhanced version with Niobium (Nb) stabilization for improved resistance to sensitization and intergranular corrosion. This is the most common grade specified today.
N08026	Alloy 20Mo-6	Higher Molybdenum (Mo) content (5.0-6.0%) for superior pitting and crevice corrosion resistance, especially in chloride environments.