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SPECIFICATION FOR NICKEL ALLOY (UNS N06625 AND UNS N08825) WELDED PIPE

 1.Scope 

1.1 This specification covers elded UNS N06625 and UNS N08825 pipe in the annealed condition ( temper) for grneral corrosion applications.

1.2 This specification covers pipe sizes in schedules shown in Table 1. 

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

1.4 The following precautionary caveat pertains only to he test mehods portions, Sectons 7 and 13, of this specification: This standard does not purport to address all of safety cconcerns, if any, associatsd with its use. It is the responsibility of he user of this standard to esrablish appropriare safety of regulatory limitations prior to use.  





TABLE1 PRODUCT(CHECK) ANALYSIS CHEMICAL COMPOSITION VARIATIONS

Element Specified Limit of elemetn, %, incl Variation under min or over max of the Specified Limit of Element
Ni over 30.0 to 40.0 0.30
over 40.0 to 60.0 0.35
Cr over 15.0 to 25.0 0.25
Fe over 2.5 to 5.0 0.07
over 15.0 tp 30.0 0.30
Mo over 1.0 to 3.0 0.05
Over 3.0 to 5.0 0.10
over 5.0 to 20.0 0.15
Cb+Ta over 3.0 to 5.0 0.15
C over 0.02 to 0.20 0.01
Mn up to 1.0 0.03
Si over 0.25 to 0.50 0.03
P up to 0.04 0.005
S up to 0.02 0.003
over 0.02 to 0.06 0.005
Al over 0.10 to 0.50 0.05
Ti over 0.10 to 0.50 0.03
over 0.50 to 1.0 0.04
over 1.0 to 2.0 0.05
Co over 0.2 to 1.0 0.03
Cu over 0.5 to 5.0 0.04




  TABLE2 CHEMICAL REQUIREMENTS

Composition Limits, %
UNS N06625 UNS N08825
Ni 58.0minA 38.0-46.0
Cr 20.0-23.0 19.5-23.5
Fe 5.0max 22.0minA
Mo 8.0-10.0 2.5-3.5
Cb+Ta 3.15-4.15 ...
C 0.10max 0.05max
Mn 0.50max 1.0max
Si 0.5max 0.5max
P 0.015max ...
S 0.015max 0.03max
Al 0.4max 0.2max
Ti 0.40max 0.6-1.2
Co(if dtermined) 1.0max ...
Cu ... 1.5-3.0


 AElement may be determined arithmetically by difference.   



TABLE3 PRODUCT (CHECK) ANALYSIS CHEMICAL COMPOSITION VARIATIONS


Element		 Specified Limit of
Element, %, incl		 Variation under min or over max of the Specified limit of Element
Ni over 30.0 to 40.0
over 40.0 to 60.0		 0.30
0.35
Cr over 15.0 to 25.0 0.25
Fe over 2.5 to5.0
over 15.0 to 30.0		 0.07
0.30
Mo over 1.0 to 3.0
over 3.0 to 5.0
over 5.0 to 20.0		 0.05
0.10
0.15
Cb+Ta over 3.0 to 5.0 0.15
C over 0.02 to 0.20 0.01
Mn up to 1.0 0.03
Si over 0.25 to 0.50 0.03
P up to 0.04 0.005
S up to 0.02 0.003
0.05
Al over o.10 to 0.50 0.05
Ti over 0.10 to 0.50
over 0.50 to 1.0
over 1.0 to 2.0		 0.03
0.04
0.05
Co over 0.2 to 1.0 0.03
Cu over 0.5 to 5.0 0.04




TABLE4 MECHANICAL PROPERTY REQUITREMENTS

Alloy Tensile strength,min, psi(MPa) Yield strength
0.2% offset,
min, psi(MPa)		 Elongation in 2in.
or 50 mm,, min, %
UNS N06625
UNS N08825		 120 000 (827)
85 000 (586)		 60 000 (414)
35 000 (240)		 30
30




  TABLE5 PERMISSIBLE VARIATIONS IN OUTSIDE DIAMETERA AND WALL THICKNESSB

IPS Permissible variations in ouside diameter, in. (mm)C
Plus Minus
1/8
1/4
3/8
1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4
5
6		 0.005(0.13)
0.005(0.13)
0.075(0.19)
0.075(0.19)
0.010(0.25)
0.010(0.25)
0.010(0.25)
0.015(0.38)
0.018(0.46)
0.018(0.46)
0.025(0.64)
0.025(0.64)
0.025(0.64)
0.025(0.64)
0.025(0.64)		 0.005(0.13)
0.005(0.13)
0.075(0.19)
0.075(0.19)
0.010(0.25)
0.010(0.25)
0.010(0.25)
0.015(0.38)
0.018(0.46)
0.018(0.46)
0.025(0.64)
0.025(0.64)
0.025(0.64)
0.025(0.64)
0.025(0.64)

These permissible variations in ouside diameter apply only to material as finished at the mill before subsequent swaging, expanding, bending, polishing, or other fabricating operations.
Wall thickness variation shall not exceed ±12% of the nominal wall thickness. COvality is the difference between maximum and minimum outside diameter measured at any one cross section. There is no additional tolerance for ovality on material having a nominal wall thickness of more than 3% of the outside diameter. On this material, the average of amximum and minimum outside diameter measurements above. An additional ovality allowance of twic the outside diameter tolerance spreads shown above, applied one half plus and one half minus, is allowed for material having nominal wall thickness of 3% or less of nominal outside diameter.  



TABLE6 PERMISSIBLE VARIATIONS IN LENGTHA

Outside diameter, in. (mm) Cut length, in. (mm)
Over Under
Under 2 (50.8)
2 (50.8) and over		 1/8 (3)
3/16 (5)		 0
0

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