ASTM B674 / ASME SB674 / UNS N08904, UNS N08925, and UNS N08926 Welded Tube supplier & distributor in India

ASTM B-674 / ASME SB-674

SPECIFICATION FOR UNS N08904, UNS N08925, AND UNS N08926 WELDED TUBE
UNS N08904, UNS N08925, AND UNS N08926

1.Scope

1.1This specification covers UNS N08904, UNS N08925, and UNS N08926 welded tube for general corrosion applications.

1.2 This specification covers outside diameter and nominal wall tube.

1.2.1 The tube sizes coverd by this specification are 1/8 to 5 in. 93.2 to 127 mm) in outside diameter and 0.015 to 0.320 in. 90.38 to 8.13 mm), inclusive, in wall thickness.

1.3 The values stated in inch-pound units are to be regarded as the standard. Th values stated in parentheses are for information only.

TABLE1 CHEMICAL REQUREMENTS

Element	Composition, %			Product (Check) Analysis Variations, under min or over max, of the Specified Limti of Element, %
Element	UNS N08904	UNS N08925	UNS N08926	UNS N08904 UNS N08925	UNS N8926
Carbon , max	0.020	0.020	0.020	0.005	0.0005
Manganese, max	2.00	1.00	2.00	0.04	0.04
Phosphorus, max	0.045	0.045	0.03	0.005	0.005
Sulfur, max	0.035	0.030	0.01	0.005	0.003
Silicon, max	1.00	0.50	0.5	0.05	0.03
Nickel	23.0 to 28.0	24.0 to 26.0	24.00 to 26.00	0.20	0.25
chromium	19.0 to 23.0	19.0 to 21.0	19.00 to 21.00	0.20	0.25
Molybdenum	4.0 to 5.0	6.0 to 7.0	6.0 to 7.0	0.10	0.15
Copper	1.0 to 2.0	0.8 to 1.5	0.5 to 1.5	0.10	0.04
Nitrogen	...	0.1 to 0.2	0.15 to 0.25	...	0.01
Iron	balance	balance	balance	...	...

TABLE MECHANICAL PROPERTIES

Apply	Temper	Tensile Strength, min, psi(MPa)	Yield Strength, 0.2% offset, min, psi(MPa)	elongation in 2 in. or 50mm(or 4D), min, %
UNS N08904	solution annealed	71(490)	31(220)	35
UNS N08925	solution annealed	87(600)	43(295)	40
UNS N08926	solution annealed	94(650)	43(295)	35

TABLE3 PERMISSIBLE VARIATIONS IN OUTSIDE DIAMETERAAND WALL THICKNESS

Specified ouside Diameter	Permissible Variations
	Outside DiameterB		Wall Thickness, %
	Plus	Minus	Plus	Minus
Inches
1/8 to 5/8, excl	0.005	0.005	15.0	15.0
5/8 to 1 1/2, incl	0.00075	0.0075	10.0	10.0
Over 1 1/2 to 3 1/2, incl	0.010	0.010	10.0	10.0
Over 3 1/2 to 4 1/2, incl	0.015	0.015	10.0	10.0
Over 4 1/2 to 5, incl	0.020	0.020	12.5	12.5
Milimeters
3.2 to 15.9, excl	0.13	0.13	12.5	12.5
15.9 to 38.1, incl	0.19	0.19	10.0	10.0
Over 38.1 to 88.9, incl	0.25	0.25	10.0	10.0
Over 88.9 to 114.3, incl	0.38	0.38	10.0	10.0
Over 114.3 to 127, incl	0.51	0.51	12.5	12.5

AThese permissible variations in outside diameter apply only to material as finished at the mill vefore subsequent swaning,
expanding, bending, polishing, or other fabricating operations.
BOvality is difference between the maximum and the minimum outside diameter measured at any one cross section.
There is no additional tolerance for ovality on material having a nominal wall thickness for more than 3% of the outside diameter.
On this material, the average of the maximum and the minimum outside diameter measurements will fall within the outside diameter
tolerance shown in Table 3. An additional ovality allowance of twice the outside diameter tolerance spreads shown in Table 3,
applied ±1/2, is allowed for material having nominal wall thickness of 3% or less of the nominal outside diameter.

TABLE4 PERMISSIBLE VARIATION IN LENGTHA

Outside Diameter, in.(mm)	Cut Length, in.(mm)
Outside Diameter, in.(mm)	Over	Under
Under 2(50.8)	1/8(3.18)	0
2(50.8) and over	3/16(4.75)	0

AThese permissible variations in length apply to tube before bending. They apply to cut lengths up to and including 24 ft(7.3m).
For lengths over 24 ft, an additional over-tolerance of 1/8 in.(3.18mm) for each 10 ft(3.0m) of fraction thereof shall be permissible
up to a maximum additional over-tolerance of 1/2 in.(12.7mm).

Test Methods

13.1 Determine the chemical composition, mechanical, and other properties of the material as enumerated in this specification,
in case of disagreement, in accordance with the following methods :

Test	ASTM Designation
Chemical analysis	E 354
Tension	E 8
Rounding procedure	E 29

For purposes of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or a calculated values shall be rounded as indicated, in accordance with the rounding method of Practice E 29 :

Test	Rounded Unit for Observed or Calculated Value
Chemical composition and tolerances (when expressed in decimals)	Nearest unit in the last right-hand place of figures of the specified limit. If two choces are possible, as when the digits dropped are exactly a 5 or a 5 followed only by zeros, choose the one ending in an even digit, with zero defined as an even digit.
Tensile strength, and yield strength	Nearest 1000 psi (6.9 MPa)
Elongation	Nearest 1%

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