ASTM B704 / ASME SB704 / Welded UNS N06625 and UNS N08825 Alloy Tubes supplier & distributor in India

ASTM B-704 / ASME SB-704

SPECIFICATION FOR WELDED UNS N06625 AND UNS N08825 ALLOY TUBES

1.Scope

1.1 This specification covers welded UNS N06625 and UNS N08825 alloy boiler, heat exchanger, and condense tubes for general corrosion resisting and low or high-temperature service.

1.2 This specification covers tubes 1/8 to 5 in. (3.18 to 127 mm), inclusive, in outside diameter and 0.015 to 0.500 in.
(0.38 to 12.70 mm), inclusive, in wall thickness.
Tble 2 of Specification B 751 lists the dimensional requirements of these sizes. Tubes aving other dimensions may be furnished provided such tubing complies with all other requirements of this specification.

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

TABLE1 CHMICAL REQURIEMENTS

	Composition Limits, %
	UNS N06625	UNS N08825
Ni	58.0 minA	38.0-46.0
Cr	20.0-23.0	19.5-23.5
Fe	5.0max	22.0 minA
Mo	8.0-10.0	2.5-3.5
Cb+Ta	3.15-4.15	...
C	0.10max	0.05 max
Mn	0.50max	1.0max
Si	0.15max	0.5max
P	0.15max	...
S	0.4max	0.03max
Al	0.40max	0.2max
Ti	0.40max	0.6-1.2
Co(if determined)	1.0max	...
Cu	...	1.5-3.0

Aelement may be determined arithmetically by difference.

TABLE2 MECHANICAL PROPERTY REQUIREMENTS

Alloy	Tensile Strngth, min, psi(MPa)	Yield Strngth,A0.2% Offset, min psi(MPa)	Elongation in 2 in . or 50mm, min, %
UNS M06625	120000(827)	60000(414)	30
UNS N08825	85000(586)	35000(240)	30

Yield strength shall be determined by the offset method at 0.2% limiting permanent set in accordance with Test Methods E 8.

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