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ASTM B677 / ASME SB677 / UNS N08904, UNS N08925, and UNS N08926 Seamless Pipe and Tube supplier & distributor in India

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SPECIFICATION FOR UNS N08904, UNS N08925,
AND UNS N08926  SEAMELSS PIPE AND TUBE
UNS N08904, UNS N08925, AND UNS N08926 7

1.Scope


1.1This specification covers UNS N08904, UNS N08925, and UNS N08926 seamless, cold-woked or hot-finished pipe and tube intended for general corrosivw service.

1.2 The values stated in inch-pound units are to be regared as the standard.





TABLE1 CHEMICAL REQURIEMENTS

Element UNS N08904 UNS N08925 UNS N08926 product(Check) Analysis Variations, under min or over max of the Specified Limit of Element, %
UNS N08904
UNS N08925		 UNS N08926
Carbon, max 0.020 0.020 0.020 0.0005 0.005
Manganese, max 2.0 1.0 2.00 0.04 0.04
Phosphorus, max 0.045 0.045 0.03 0.005 0.05
Sulfur, max 0.035 0.035 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
Molygdenum 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 0.1 to 0.2 ... 0.01
IronA balance balance balance ... ....

  


TABLE2 MECHANICAL PROPERTIES OF PIPE AND TUBE

Alloy 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 sloution annealed 71(490) 31(220) 35
USN N08925 sloution annealed 87(600) 430(300) 40
UNS N08926 sloution annealed 94(650) 43(295) 35





TABLE3 PERMISSIBLE VARIATIONS IN OUTSIDE DIAMETERA AND WALL THICKNESS 

NOTE - Ovality - The permissible variations in this table apply to individual measurements, including out-of-roundness (overality) except for the following : 

(1) Pipe and tube having a nominal wall thickness fo 3% or less of the nominal ouside diameter. 
The mean outside diameter shall conform to the permissible variations of Table 3 and individual measurements (including ovality) shall conform to the plus and minus values of the table, with the values increased by 0.5% of the nominal ouside diameter.

(2) The mean ouside diameter for pipe and tube over 4 1/2 in. (114 mm) in outside diameter with a nominal wall thickness greater than 3% of the nominal ouside diameter shall conform to the permissible variations of this table, and individual measurements shall not exceed twice the permissible variations of the table.



Specified Outside Diameter Permissible Variations
Outside
Diameter, in (mm)		 Thickness of Specified 
Average Wall, %		 Thickness of Specifined 
Minimum Wall, %
Plus Minus Plus Minus Plus Minus
Cold-Worked Pipe and Tube:
0.500(13) to 5/8(16), excl 0.005(0.13) 0.005(0.13) 15.0 15.0 30 0
5/8(16) to 1 1/2(38), incl 0.0075(0.19) 0.0075(0.19) 10.0 10.0 20 0
Over 1 1/2(38) to 3 1/2(89), incl 0.010(0.25) 0.010(0.25) 10.0 10.0 22 0
Over 3 1/2(89) to 4 1/2(114), incl 0.015(0.38) 0.015(0.38) 10.0 10.0 22 0
Over 4 1/2(114) to 3 1/2(152), incl 0.020(0.51) 0.020(0.51) 12.5 12.5 25 0
Over 6(152) to 6 1/2(168), incl 0.25(0.64) 0.25(0.64) 12.5 12.5 25 0
Hot-Finished TubeA,B:
1 1/2(38.1) to 5 1/2(139.7), excl 0.031(0.79) 0.031(0.79) 12.5 12.5 28.5 0
5 1/2(139.7) to 9 1/2(234.5) incl 0.047(1.19) 0.047(1.19) 12.5 12.5 28.5 0


AThe wall thickness tolerances for hot-finished tubes includeseccentricity tolerance up to ±12.5%.
BFor hot-finished 5 in. (127.0mm) and under in outside diameter, the tolerances on the ouside diameter apply for individual measurements and include ovality. For tubes over 5 in. ion outside diameter, the mean ouside diameter shall comform to the permissible variations of this table andindividual measurements shall not be twice the permissible variations for this table.



Test Methods 

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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