ASTM B444 / ASME SB444 / Nickel-Chromium-Molybdenium-Columbium Alloy(UNS N06628)Pipe And Tube supplier & distributor in India

ASTM B-444 / ASME SB-444
SPECIFICATION FOR NICKEL-CHROMIUM-MOLYBDENUM-COLUMBIUM ALLOY
(UNS N06628)PIPE AND TUBE

1.Scope

1.1 This specification covers nickel-chromium-molyb-demum-columbium alloy (UNS N06625) in the form of cold-worked deamless pipe and tube. The general requirements for pipe and tube are covered by Specification B 829.
1.1.1 These products are furished in twl grades of different heat-treated conditions:
1.1.1.1 Grade 1 (annwaled) - Material is normally employed in service temperaures up to 1100F (593?). 1.1.1.2 Grade 2 (solution annealed) - Material is normally employed in service temperatures above 1100F(593?) when resistance to creep and rupture is required.

NOTE ? Hot-working or reannealing may change properiws significantly, depending on working history and temperatures,

1.2 The followig precautionary caveat pertains ony to the test methods portoion, Section 12, of this specidication: This standard does not purport to address all of the safety soncerns, if any, associated wit its use. It is the responsibility of the user of this standard to estability appropriate safet and health practices and determine the applicability if regulatory limitations prior to use.

TABLE1 CHEMICAL REQUIREMENTS

Element	Composition Limits, %
C	0.10max
Mn	0.50max
Si	0.50max
P	0.015max
S	0.015max
Cr	20.0min
	23.0max
Cb+Ta	3.15min
	4.15max
Co(If determined)	1.0max
Mo	8.0min
	10.0max
Fe	5.0max
Al	0.40max
Ti	0.40max
NiA	58.0min

AElemnet shall be determined arithmetically by difference.

TABLE2 ROOM TEMPERATURE TENSILE PROPERTIES AND HEAT TREATMENT INCLUDING
SMALL DIAMETER AND LIGHT-WALL TUBING(CONVERTER SIZES)A, B

Condition	Tensile Strength min, ksi(MPa)C	Yield Strength(0.2% offset min, ksi(MPa)C	Elongation in 2 in. or 50.8mm(or 4D), min, %
Grade 1(annealed)D	120(827)	60(414)	30
Grade 2(solution annealed)E	100(690)	40(276)	30

Not applicable to outside diameters under 1/8 in.(3.2mm)and to wall thicknesses under 0.015in.(0.38mm).

Hot forming quality pipe and tubing is furnished to chemical requiremnets and surface inspection only.
No tensile properties are required.

The minimum strength values apply only to tubing in straigth lengths.

Annealed at 1600?(871?) minimum.

Solution annealed at 2000?(1093?)minimum, with or without subsequent stabilization anneal at 1800?(982?)
minimum to increase resistance to sensitization.

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