Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234 Archives

Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234

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Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234
Standard Specification for Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers This standard is issued under the fixed designation B 234; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.


Scope
This specification covers aluminum-alloy drawn seamless round tube in straight lengths, for use in surface condensers, evaporators, and heat exchangers. NOTE 1—Throughout this specification use of the term alloy in the general sense includes aluminum as well as aluminum alloy. NOTE 2—For drawn seamless tubes used in general applications, see Specification B 210; for extruded tubes see Specification B 221; for seamless pipe see Specification B 241/B 241M; and for structural pipe and tube see Specification B 429. Alloy and temper designations are in accordance with ANSI H35.1. The equivalent Unified Numbering System alloy designations are preceded by A9, for example, A91060 for aluminum 1060, in accordance with Practice E 527. A complete metric companion to Specification B 234 has been developed—B 234M; therefore, no metric equivalents are presented in this specification. For acceptance criteria for inclusion of new aluminum and aluminum alloys in this specification, see Annex A2. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro-priate safety and health practices and determine the applicability of regulatory limitations prior to use.








Chemical Composition
Limits—The tube shall conform to the chemical composition limits. Conformance shall be determined by the producer by analyzing samples taken at the time the ingots are poured, or samples taken from the finished or semifinished product. If the producer has determined the chemical composition of the material during the course of manufacture, he shall not be required to sample and analyze the finished product. NOTE 3—It is standard practice in the United States aluminum industry to determine conformance to the chemical composition limits prior to further processing of ingots into wrought products. Due to the continuous nature of the process, it is not practical to keep a specific ingot analysis identified with a specific quantity of finished material. Number of Samples—The number of samples taken for determination of chemical composition shall be as follows: When samples are taken at the time the ingots are poured, at least one sample shall be taken for each group of ingots poured simultaneously from the same source of molten metal. When samples are taken from the finished or semi-finished product, a sample shall be taken to represent each 4000 lb, or fraction thereof, of material in the lot, except that not more than one sample shall be required per piece. Methods of Sampling—Samples for determination of chemical composition shall be taken in accordance with one of the following methods: Samples of chemical analysis shall be taken by drilling, sawing, milling, turning, clipping, and so forth, a representative piece or pieces to obtain a prepared sample of not less than 75 g. Sampling shall be in accordance with Practice E 55. Sampling for spectrochemical analysis shall be in accordance with Practices E 716. Samples for other methods of analysis shall be suitable for the form of material being analyzed and the type of analytical method used. NOTE 4—It is difficult to obtain a reliable analysis of each of the components of clad materials using material in its finished state. A reasonably accurate determination of the core composition can be made if the cladding is substantially removed prior to analysis. The cladding composition is more difficult to determine because of the relatively thin layer and because of diffusion of core elements to the cladding. The correctness of cladding alloy used can usually be verified by a combination of metallographic examination and spectrochemical analysis of the surface at several widely separated points. Methods of Analysis—The determination of chemical composition shall be made in accordance with suitable chemical (Test Methods E 34), or spectrochemical, (Test Methods E 607 and E 1251) methods. Other methods may be used only when no published ASTM method is available. In case of dispute, the methods of analysis shall be agreed upon between the producer and purchaser.

















Chemical Composition Limits^A,B,C
Alloy	Silicon	Iron	Copper	Manganese	Magnesium	Chromium	Zinc	Titanium	Other Elements^D		Aluminum
									Each	Total^E
1060	0.25	0.35	0.05	0.03	0.03		0.05	0.03	0.03^F		99.60 min^G
3003 Alclad 3003	0.6	0.7	0.05-0.20	1.0-1.5	3003 alloy clad with 7072 alloy		0.1		0.05	0.15	remainder
5052	0.25	0.40	0.10	0.10	2.2-2.8	0.15-0.35	0.10		0.05	0.15	remainder
5454	0.25	0.40	0.10	0.50-1.0	2.4-3.0	0.05-0.20	0.25	0.20	0.05	0.15	remainder
6061	0.40-0.8	0.7	0.15-0.40	0.15	0.8-1.2	0.04-0.35	0.25	0.15	0.05	0.15	remainder
7072^h	0.7 Si + Fe		0.10	0.10	0.1		0.8-1.3		0.05	0.15	remainder
^A Limits are in percent maximum unless shown as a range or otherwise stated. ^B Analysis shall be made for the elements for which limits are shown in this table. ^C For purposes of determining conformance to these limits, an observed value or a calculated value attained from analysis shall be rounded to the nearest unit in the last right-hand place of figures used in expressing the specified limit, in accordance with the rounding-off method of Practice E 29. ^DOthers includes listed elements for which no specific limit is shown as well as unlisted metallic elements. The producer may analyze samples for trace elements not specified in this specification. However, such analysis is not required and may not cover all metallic Others elements. Should any analysis by the producer or the purchaser establish that an Others element exceeds the limit of Each or that the aggregate of several Others elements exceeds the limit of Total, the material shall be considered nonconforming. ^EOther Elements—Total shall be the sum of unspecified metallic elements 0.010 % or more, rounded to the second decimal before determining the sum. ^F Vanadium 0.05 max. ^G The aluminum content shall be calculated by subtracting from 100.00 % the sum of all the metallic elements present in amounts of 0.010 % or more, rounded to the second decimal before determining the sum. ^H Composition of cladding alloy as applied during the course of manufacture. The sample from finished tube shall not be required to conform to these limits.











Tensile Property Limits^A,B
Alloy	Temper	Wall Thickness, in.		Tensile Strength, min, ksi		Yield Strength, (0.2% ofset), min,ksi		Elongation in 2 in., or 4 x Dia,C min, %
								Full-Section Specimen		Cut-Out Specime
1060	H14	0.010-0.200		12.0		10.0
3003	H14	0.010-0.024		20.0		17.0		3
		0.025-0.049		20.0		17.0		5		3
		0.050-0.200		20.0		17.0		8		4
	H25	0.010-0.200		22.0		19.0
Alclad 3003	H14	0.010-0.024		19.0		16.0
		0.025-0.049		19.0		16.0		5		3
		0.050-0.200		19.0		16.0		8		4
	H25	0.010-0.200		21.0		18.0
5052	H32	0.010-0.200		31.0		23.0
	H34	0.010-0.200		34.0		26.0
5454	H32	0.010-0.050		36.0		26.0				5
		0.051-0.200		36.0		26.0				8
	H34	0.010-0.050		39.0		29.0				4
		0.051-0.200		39.0		29.0				6
6061	T4	0.025-0.049		30.0		16.0		16		14
		0.050-0.200		30.0		16.0		18		16
	T6	0.025-0.049		42.0		35.0		10		8
		0.050-0.200		42.0		35.0		12		10
^A To determine conformance to this specification, each value for ultimate strength and for yield strength shall be rounded to the nearest 0.1 ksi and each value for elongation to the nearest 0.5 %, both in accordance with the rounding-off method of Practice E 29. ^B The basis for establishment of mechanical property limits is shown in Annex A1. ^C Elongation of full-section and cut-out sheet-type specimens is measured in 2 in., of cut-out round specimens, in 4 x specimen diameter.



Manufacture
The tube shall be produced by drawing an extruded tube made from hollow extrusion ingot (cast in hollow form or pierced) and extruded by use of the die and mandrel method.
Tensile Properties of Material as Supplied
Limits—The tube shall conform to the tensile property requirements. Number of Specimens: For material having a nominal weight of less than 1 lb/linear ft, one tension test specimen shall be taken for each 1000 lb, or fraction thereof, in the lot. For material having a nominal weight of 1 lb or more/linear ft one tension test specimen shall be taken for each 1000 ft, or fraction thereof, in the lot. Other procedures for selecting samples may be employed if agreed upon by the producer and the purchaser. Test Methods—The tension tests shall be made in accordance with Test Methods B 557.





Heat Treatment
Unless otherwise specified in 9.2, producer or supplier heat treatment for the applicable tempers shall be in accordance with AMS 2772. When specified, heat treatment of applicable tempers shall be in accordance with Practice B 918.

Leak Test
Each length of tube 1.5 in. or less in diameter shall be tested by either of the following methods, at the option of the producer or supplier, consistent with the size limitations indicated: Method 1—Applicable to tube with a wall thickness of 0.200 in. max. Each tube shall be subjected to an internal air gage pressure of 250 psi for 5 s while immersed in a suitable liquid. Any evidence of leakage shall be cause for rejection. Method 2—Applicable to tube with a wall thickness of 0.083 in. maximum, as covered by Practice E 215. Each tube shall be subjected to an eddy current test in accordance with the procedures described in Practice E 215. Reference standards described in Annex A1 and Annex A2 shall be used to standardize the equipment. These same reference standards or secondary standards having equivalent eddy current response shall also serve to define acceptance-rejection limits. Tubes that produce eddy current indications less than those from the 2A holes of the applicable reference standard or an equivalent secondary standard shall be acceptable. Any tube having a discontinuity that produces an eddy current indication equal to or greater than those from the 2A holes of the applicable reference standard or an equivalent secondary standard shall be rejected.







Expansion Test
The tube ends shall be capable of being flared, without showing cracks or ruptures visible to the unaided eye when corrected for normal vision, by forcing a steel pin having a taper of 1.5 in./ft into the tube until the inside diameter has been increased 20 %.

Cladding
The aluminum alloy cladding of Alclad 3003 tube shall, as specified, comprise either the inside surface (only) and its thickness shall be approximately 10 % of the total wall thickness, or the outside surface (only) in which case its thickness shall be approximately 7 % of the total wall thickness. When the thickness of the cladding is to be determined on finished tube, transverse cross sections of at least three tubes from the lot shall be polished for examination with a metallurgical microscope. Using a magnification of 100X, the cladding thickness at four points, 90° apart, in each sample shall be measured and the average of all measurements shall be taken as the thickness. In the case of tubes having a diameter larger than can properly be mounted for polishing and examination, the portions of the cross section polished for examination may consist of an arc about V2 in. in length.




Dimensional Tolerances
Variations from the specified wall thickness, length, outside diameter, straightness, and squareness of cut ends shall not exceed the tolerances specified in the tables of ANSI H35.2. Sampling for Inspection—Examination for dimensional conformance shall be made to ensure conformance to the tolerance specified.

Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234 Alloy 7072h	Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234 Alloy 6061	Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234 Alloy 5454
Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234 Alloy 5052	Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234 Alloy 3003	Aluminum and Aluminum-Alloy Drawn Seamless Tubes for Condensers and Heat Exchangers B234 Alloy 1060

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