ASTM B668 / ASME SB668 / UNS N08028 Seamless Tubes supplier & distributor in India

ASTM B-668 / ASME SB-668

SPECIFICATION FOR UNS N08028 SEAMLESS TUBES

1.Scope

1.1 This specification covers UNS N08028 seamless cold-finisfd tubes intended for general corrosive service.

1.2 This specification covers outside diameter and average wall tube, or otside diameter and minimum wall tbe.

1.2.1 This specification covers tubes 5/8 to 5 in. (15.9 o 127 mm), inclusive, in outside diameter and 0.065 to 0.500 in. 9 1.65 to 12.70 mm), inclusive, in wall thickness.

NOTE 1 ? Tubing having other dimensions may be furnished spon agreeent between he manufacturer and the purchader, provided such tubes comply with all other requirements of this specification.

1.3 The values stated in inch-pound units are to be regarded as the standard.

ABLE1 CHEMICAL REQUIREMENTS

Element	Composition, %
Carbon, max	0.030
Silicon, max	1.0
Manganese, max	2.50
Phosphorus, max	0.030
Sulfur, max	0.030
Chromium	26.0-28.0
Nickel	30.0-34.0
Molybdenum	3.0-4.0
Copper	0.6-1.4
Iron	RemainderA

ADetermined arithmetically by difference.

TABLE2 PRODUCT(CHECK) ANALYSIS TOLERANCES

Element	Tolerances Over the Maximum Limit of Under the Minimum Limit
Carbon	0.005
Silicon	0.05
Manganese	0.04
Phosphorus	0.005
Sulfur	0.005
Chromium	0.25
Nickel	0.30
Molybdenum	0.10
Copper	0.10

TABLE3 TENSILE REQUIREMENTS

Tensile Strength, min, ksi(MPa)	Yield Stregth, 0.2% Offset, min,ksi(MPa)	Elongation in 2 in.(50.8mm) or 4D, min, %
73(500)	31(214)	50

TABLE4 PERMISSIBLE VARIATIONS IN OUTSIDE DIAMETER AND WALL THICKNESS

Specified Outside Diameter, in.(mm)	Wall Thickness, %
	Outside Diameter, in.(mm)		Average		Minimum Wall
	+	-	+	-	+	-
5/8 to 1 1/2(15.9 to 38.1), incl	0.0075(0.19)	0.075(0.19)	10.0	10.0	22.0	0
Over 1 1/2 to 3 1/2(38.1 to 88.9), incl	0.010(0.25)	0.010(0.25)	10.0	10.0	22.0	0
Over 3 1/2 to 1 1/2(88.99 to 114.3), incl	0.015(0.38)	0.015(0.38)	10.0	10.0	22.0	0
Over 4 1/2 to 5(114.3 to 127), incl	0.020(0.51)	0.020(0.53)	12.5	12.5	22.0	0

Requirements	Rounded Unit for Observed or Calculated Value
Chemical composition and tolerances	Nearest unit in the last righthand place of figures of the specified limit
Tensile strength and yield strength	Nearest 1000 psi (7 MPa)
Elongation	Nearest 1%

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