ASTM B673 / ASME SB673 / UNS N08904, UNS N08925, and N8926 Welded Pipe supplier & distributor in India

ASTM B-673 / ASME SB-673

SPECIFICATION FOR UNS N08904, UNS N08925, AND N8926 WELDED PIPE
UNS N08904, UNS N08925, AND N8926

1.Scope

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

1.2 This specification covers pipe sizes in schedules shown in Table 1. 1.3 The values standard in inch-pond nits are to be regarded as the standard. The values given in parentheses are for information only.

TABLE1 DIMENSIONS OF WELDED PIPE

NOTE1- The following table is a artial reprint of Table 1 of ANSI B36. 19.
NOTE2- The decimal thicknesses listed for the respective pipe sizes represent their nominal wall dimensions.
NOTE3- 1 in. = 25.4mm.

Nominal Pipe Size, in.	Outside Diameter		Nominal Wall Thickness, in.
Nominal Pipe Size, in.	Outside Diameter		Schedule	5SA	Schedule	10SA	Schedule	40S	Schedule	80S	Schedule	160S
1/8	0.405	10.29	...	...	0.049	1.25	0.068	1.73	0.095	2.41	...	...
1/4	0.540	13.72	...	...	0.065	1.65	0.088	2.24	0.119	3.02	...	...
3/8	0.675	17.15	...	...	0.065	1.65	0.091	2.31	0.126	3.20	...	...
1/2	0.840	21.34	0.065	1.65	0.083	2.11	0.109	2.77	0.147	3.73	0.187	4.75
3/4	1.050	26.67	0.065	1.65	0.083	2.11	0.113	2.87	0.154	3.91	0.218	5.54
1	1.315	33.40	0.065	1.65	0.109	2.77	0.133	3.38	0.179	4.46	0.250	6.35
1 1/4	1.660	42.16	0.065	1.65	0.109	2.77	0.140	3.56	0.191	4.85	0.250	6.35
1 1/2	1.900	48.26	0.065	1.65	0.109	2.77	0.145	3.68	0.200	5.08	0.281	7.14
2	2.375	60.33	0.065	1.65	0.109	2.77	0.154	3.91	0.218	5.54	0.343	8.71
2 1/2	2.875	73.03	0.083	2.11	0.120	3.05	0.203	5.16	0.276	7.01	0.375	9.52
3	3.500	88.90	0.083	2.11	0.120	3.05	0.216	5.49	0.300	7.62	0.438	11.12
3 1/2	4.000	101.60	0.083	2.11	0.120	3.05	0.226	5.74	0.318	8.08	...	...
4	4.500	114.30	0.083	2.11	0.120	3.05	0.237	6.02	0.337	8.56	0.581	13.41
5	5.563	141.30	0.109	2.77	0.134	3.40	0.258	6.55	0.375	9.52	0.625	15.88
6	6.623	168.30	0.109	2.77	0.134	3.40	0.280	7.11	0.432	10.97	0.718	18.24
8	8.625	219.07	0.109	2.77	0.134	3.76	0.322	8.18	0.500	12.70	0.906	23.01
10	10.750	273.05	0.134	3.40	0.148	4.19	0.365	9.27	0.500B	12.70B	1.125	28.58
12	12.75	323.85	0.156	3.96	0.165	4.57	0.375	9.52	0.500B	12.70B	1.312	33.32
14	14.00	355.60	0.156C	3.96	0.180	4.78	0.375	9.52	0.500	12.70	...	...
16	16.00	406.40	0.165C	4.19	0.188	4.78	0.375	9.52	0.500	12.70	...	...
18	18.00	457.20	0.165C	4.19	0.188	4.78	0.375	9.52	0.500	12.70	...	...
20	20.00	508.00	0.188C	4.78	0.218C	5.54	0.375	9.52	0.500	12.70	...	...
22	22.00	558.80	0.188C	4.78	0.218C	5.54	0.375	9.52	0.500	12.70	...	...
24	24.00	609.60	0.218C	5.54	0.250	6.35	0.375	9.52	0.500	12.70	...	...
30	30.00	762.00	0.250C	6.35	0.312	7.92	0.375	9.52	0.500	12.70	...	...

A Schedule 5S and 10S wall thicknesses do not pemit threading in accordance with ANSI B2.1.
BThese do not conform to ANSI B31.10.
CThese do not conform to ANSI for Welded and Seamless Wrought Steel Pipe(ANSI B36.10).

TABLE2 CHEMICAL REQUIREMENTS

Element	UNS N08904	UNS N08925	UNS N08926	Product(Check) Analysis VAriations, under min. or over max of the Specified Limit of Element, %
Element	UNS N08904	UNS N08925	UNS N08926	UNS N08904 UNS N08925	UNS N08926
Carbon, max	0.020	0.020	0.020	0.005	0.005
Manganese, max	2.0	1.0	2.00	0.04	0.04
Phosphorus, max	0.045	0.045	0.03	0.005	0.005
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
IronA	balance	balance	balance	...	...

AIron shall be determined arithmetically by difference.

TABLE3 MECHANICAL PROPERTIES

Alloy	Temper	Tensile Strength, min, psi(MPa)	Yield Strength, 0.2% offset, min, psi(MPa)	Elongation in 2 in. or 50mm, (or4D), min, %
UNS N08904	solution annealed	71(490)	31(220)	35
UNS N08925	solution annealed	87(600)	43(300)	40
UNS N08926	solution annealed	94(650)	43(295)	35

TABLE4 PERMISSIBLE VARIATIONS IN OUTSIDE DIAMETER AND WALL THICKNESSA

NPS	Permissible Variations in Outside Diameter,C in.(mm)
NPS	+	-
1/8	0.005(0.13)	0.005(0.13)
1/4	0.005(0.13)	0.005(0.13)
3/8	0.0075(0.19)	0.0075(0.19)
1/2	0.0075(0.19)	0.0075(0.19)
3/4	0.010(0.25)	0.0075(0.19)
1	0.010(0.25)	0.0075(0.19)
1 1/4	0.010(0.25)	0.010(0.25)
1 1/2	0.015(0.38)	0.010(0.25)
2	0.018(0.46)	0.010(0.25)
2 1/2	0.018(0.46)	0.010(0.25)
3	0.025(0.64)	0.010(0.25)
3 1/2	0.025(0.64)	0.015(0.38)
4	0.025(0.64)	0.015(0.38)
5	0.025(0.64)	0.020(0.51)
6	0.025(0.64)	0.030(0.76)

AThese permissible variations in outside diameter apply only to material as finsihed at the mill before subsequrent swaging, expanding, bending, polishing, or other fabricating operations.
BThe wall thickness variation shall not exceed ±12% of the nominal wall thickness.
COvality is the maximum and the minimum outside diamter measured at any one cross section.

Tere 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 the average of the maximum and the minimum outside diamter measurements will fall within the ouside diameter tolerance shown in Table 4. An additional ovality allowance of twice the outside diameter tolerance spreads shown in Table, applied ±1/2, is allowed for material having a nomianl wall thickness of 3 % or less of the nominal outside diameter.

TABLE5 PERMISSIBLE VARIATIONS IN LENGTHA

Outside Diameter, in.(mm)	Cut Length, in.(mm)
Outside Diameter, in.(mm)	Over	Under
Under 2(50.8)	1/8(3.2)	0
2(50.8) and over	3/16(4.8)	0

ATHese permissible variations in length apply to pipe 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 1/8in.(3.2mm) for each 10 ft (3.0m) or 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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