Abstract
This guide establishes requirements for seamless and welded copper-nickel tubes for use in heat exchangers in water desalting plants. Seamless tubes shall be manufactured by hot extrusion or piercing, and subsequent cold working and annealing as to produce a uniform, seamless wrought structure in the finished product. The welded tubes shall be manufactured from flat rolled strip which is subsequently formed and welded by a forge-weld process or a fusion-weld process. For forged-welded tube, the edges of the strip shall be heated to a required welding temperature, usually by high-frequency electric current, and be pressed firmly together causing a forged-type joint to be formed with internal and external flash or bead. On the other hand, fusion-welded tube shall be mechanically worked to produce a smooth external and internal surface without the application of scarfing or other removal of the weld bead. The product shall be cold worked and annealed as necessary to meet properties of the temper specified. The test specimen shall be free of defects, but blemishes of a nature that do not interfere with the intended application are acceptable for the following tests: expansion test, flattening test, and reverse-bend test. Forged-welded and annealed tubes shall have a completely recrystallized grain structure, and the weld zone shall have a structure typical of hot-forged welds. Fusion-welded and annealed tube shall have a structure typical of a fusion weld on its weld zone. The product shall be clean and free from defects, but blemishes of a nature that do not interfere with the intended application are acceptable.
This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
1. Scope
1.1 This specification establishes requirements for seamless and welded copper-nickel tubes from 0.250 to 2.125 in. (6.35 to 54.0 mm) in diameter for use in heat exchangers in water desalting plants. The following alloys are involved:
| Copper or
Copper Alloy UNS No. | Type of Metal |
| C70600 | 90-10 copper-nickel |
| C70620 | 90-10 copper-nickel
(Modified for Welding) |
| C71500 | 70-30 copper-nickel |
| C71520 | 70-30 copper-nickel
(Modified for Welding) |
| C71640 | copper-nickel-iron-manganese |
| C72200 | copper-nickel |
1.2 Units???Values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 The following safety hazard caveat pertains only to the test methods of Section 16 described in this specification: 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 appropriate safety and health practices and determine the applicability of regulatory limitations prior to its use.
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
B111/B111M Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock
B153 Test Method for Expansion (Pin Test) of Copper and Copper-Alloy Pipe and Tubing
B154 Test Method for Mercurous Nitrate Test for Copper Alloys
B543 Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube
B601 Classification for Temper Designations for Copper and Copper Alloys--Wrought and Cast
B846 Terminology for Copper and Copper Alloys
B858 Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys
E3 Guide for Preparation of Metallographic Specimens
E8 Test Methods for Tension Testing of Metallic Materials
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods)
E76 Test Methods for Chemical Analysis of Nickel-Copper Alloys
E112 Test Methods for Determining Average Grain Size
E118 Test Methods for Chemical Analysis of Copper-Chromium Alloys
E243 Practice for Electromagnetic (Eddy-Current) Examination of Copper and Copper-Alloy Tubes
E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition
E478 Test Methods for Chemical Analysis of Copper Alloys
Keywords
C70600; C70620; C71500; C71520; C71640; C72200; ; copper-nickel; desalting; heat exchangers; seamless tubes; tubes; water desalting; welded tubes;
ICS Code
ICS Number Code 77.150.30 (Copper products)
DOI: 10.1520/B0552-12
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