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Unformatted text preview: SPECIFICATION FOR ELECTRIC-RESISTANCEWELDED CARBON STEEL HEAT-EXCHANGER AND CONDENSER TUBES
(Identical with ASTM Speciﬁcation A 214/A 214M-90a) 1. Scope 3. General Requirements 1.1 This speciﬁcation covers minimum-wallthickness, electric-resistance-welded, carbon steel tubes to be used for heat exchangers, condensers, and similar heat-transfer apparatus. 1.2 The tubing sizes usually furnished to this speciﬁcation are to 3 in. [76.2 mm] in outside diameter, inclusive. Tubing having other dimensions may be furnished, provided such tubes comply with all other requirements of this speciﬁcation. 1.3 Mechanical property requirements do not apply to tubing smaller than 1⁄8 in. [3.2 mm] in inside diameter or 0.015 in. [0.4 mm] in thickness. 1.4 The purchaser shall specify in the order the outside diameter and minimum wall thickness. The inside diameter shall not be speciﬁed. 1.5 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the speciﬁcation. The inch-pound units shall apply unless the “M” designation of this speciﬁcation is speciﬁed in the order. 3.1 Material furnished under this speciﬁcation shall conform to the applicable requirements of the current edition of Speciﬁcation A 450/A 450M, unless otherwise provided herein. 4. Ordering Information 4.1 Orders for material under this speciﬁcation should include the following, as required, to describe the desired material adequately: 4.1.1 Quantity (feet, metres, or number of lengths), 4.1.2 Name of material (electric-resistance-welded tubes), 4.1.3 Size (outside diameter and minimum wall thickness), 4.1.4 Length (speciﬁc or random), 4.1.5 Optional requirements (Section 8 and 10.5), 4.1.6 Test report required (see Certiﬁcation Section of Speciﬁcation A 450/A 450M), 4.1.7 Speciﬁcation designation, and 4.1.8 Special requirements. 2. Referenced Document 5. Manufacture 2.1 ASTM Standard: A 450/A 450M Speciﬁcation for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
352 5.1 Tubes shall be made by electric-resistance welding. COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services PART A — FERROUS MATERIAL SPECIFICATIONS SA-214/SA-214M 6. Heat Treatment 10. Mechanical Tests Required 6.1 After welding, all tubes shall be heat treated at a temperature of 1650°F [900°C] or higher and followed by cooling in air or in the cooling chamber of a controlled atmosphere furnace. Cold drawn tubes shall be heat treated after the ﬁnal cold-draw pass at a temperature of 1200°F [650°C] or higher. 10.1 Flattening Test — One ﬂattening test shall be made on specimens from each of two tubes from each lot (Note) or fraction thereof. 10.2 Flange Test — One ﬂange test shall be made on specimens from each of two tubes from each lot (Note) or fraction thereof. 10.3 Reverse Flattening Test — One reverse ﬂattening test shall be made on a specimen from each 1500 ft [450 m] of ﬁnished tubing. 10.4 Hardness Test — Brinell or Rockwell hardness tests shall be made on specimens from two tubes from each lot. The term lot applies to all tubes prior to cutting, of the same nominal diameter and wall thickness which are produced from the same heat of steel. When ﬁnal heat treatment is in a batch-type furnace, a lot shall include only those tubes of the same size and the same heat which are heat treated in the same furnace charge. When ﬁnal heat treatment is in a continuous furnace, a lot shall include all tubes of the same size and heat, heat treated in the same furnace at the same temperature, time at heat, and furnace speed. 10.5 Hydrostatic or Nondestructive Electric Test — Each tube shall be subjected to either the hydrostatic or the nondestructive electric test. The purchaser may specify which test is to be used. 7. Chemical Composition 7.1 The steel shall conform to the following requirements as to chemical composition:
Carbon, % Manganese, % Phosphorus, max Sulfur, max, % 0.18 0.27–0.63 0.035 0.035 7.2 Supplying an alloy grade of steel that speciﬁcally requires the addition of any element other than those listed in 8.1 is not permitted. 8. Product Analysis 8.1 When requested on the purchase order, a product analysis shall be made by the supplier from one tube per 250 pieces; or when tubes are identiﬁed by heat, one tube per heat shall be analyzed. The chemical composition thus determined shall conform to the requirements speciﬁed. 8.2 If the original test for product analysis fails, retests of two additional lengths of ﬂat-rolled stock, or tubes shall be made. Both retests, for the elements in question shall meet the requirements of the speciﬁcation; otherwise all remaining material in the heat or lot (Note) shall be rejected or, at the option of the producer, each length of ﬂat-rolled stock or tube may be individually tested for acceptance. Lengths of ﬂat-rolled stock or tubes which do not meet the requirements of the speciﬁcation shall be rejected.
NOTE — A lot consists of 250 tubes. 11. Surface Condition 11.1 The ﬁnished tubes shall be free of scale. A slight amount of oxidation shall not be considered as scale. 12. Product Marking 12.1 In addition to the marking prescribed in Speciﬁcation A 450/A 450M, the letters “ERW” shall be legibly stenciled on each tube, or marked on a tag attached to the bundle or box in which the tubes are shipped. 12.2 The manufacturer’s name or symbol may be placed permanently on each tube by rolling or light stamping before normalizing. If a single stamp is placed on the tube by hand, this mark should not be less than 8 in. [200 mm] from one end of the tube. 9. Hardness Requirements 9.1 The tubes shall have a hardness number not exceeding 72 HRB. 353 COPYRIGHT American Society of Mechanical Engineers Licensed by Information Handling Services ...
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This note was uploaded on 10/04/2010 for the course ENGINEERS 22453175 taught by Professor Heydari during the Spring '08 term at Miami University.
- Spring '08