ASTM B468 / ASME SB468 / Welded UNS N08020 N08024 and N08026 Alloy Tubes supplier & distributor in India

ASTM B-468 / ASME SB-468
SPECIFICATION FOR WELDED UNS N08020 N08024 AND N08026
ALLOY TUBESINCOLOY 020 = UNS 08020

1. Scope

1.1 This specification covers welded UNS N08020, N08024, and N08026 alloy boiler. heat exchanger, and condenser tubes for general corrosion-resisting and low-or high-temperature service.

1.2 This specification covers tubes 1/8 to 5 in. (3.18 to 127 mm), inclusive, in outside dimeter and 0.015 to 0.5.. in. 90.38 to 1.70 mm), inclusive, in wall thickness. Table 2 of Specification B 751 lists the dimensional requirements of these sizes. Tubes having other dimensions may be furnished such tubing complies wih all other requiremants of this specification.

1.3 The values staed in inch-pound units are to be regarded a the standaed. The values given parentheses are for infirmation only.

NOTE 1 - The recommended annealing temperatures are 12800 to 1850? (982 to 1010 ?) for UNS N08020, 1925 to 1975? (1052 to 1079?) for UNS N08024, and 2050 to 2200? (1121 to 1204?) for UNS N08026.

TALBE1 CHEMICAL REQUIREMENTS

Element	Composition, %
Element	UNS N08020	UNS N08024	UNS N08026
Carbon, max	0.07	0.03	0.03
Manganese, max	2.00	1.00	1.00
Phosphorus	0.045	0.035	0.03
Sulfur, max	0.035	0.035	0.03
Silicon, max	1.00	0.50	0.50
Nickel	32.00-38.00	35.00-40.00	33.00-37.20
Chromium	19.00-21.00	22.50-25.00	22.00-26.00
Molybdenum	2.00-3.00	3.50-5.00	5.00-6.70
Copper	3.00-4.00	0.50-1.50	2.00-4.00
Columbium(Nb)+tantaium	8x carbon-1.00	0.15-0.35
Nitrogen	...	...	0.10-0.16
IronA	Remainder	Remainder	Remainder

by difference.

TABLE2 MECHANICAL PROPERTY REQUIREMENTS

Tensile Strength, min, ksi(MPa)	Yield Strength,Amin, ksi(MPa)	Elongation in 2 in.(50.8mm), min, %
80(55)	35(241)	30.0

Yield stregth shall be derermined by the offset method at 0.2% limiting permanent set in accordance with Test Methods
E 8 An alternative method of determining yield strength may be based on total exension under load of 0.5%.

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