ASTM A498 Heat-Exchanger Integral Finned Tubes
ASTM A498/A498M-2014 Standard Specification for Seamless and Welded Carbon Steel Heat-Exchanger Tubes with Integral Fins
4.1 The finned tubes shall be manufactured from plain tubes that conform to one of the following Specifications: A179/A179M, A214/A214M, or A334/A334M.
4.2 Any tests that are required in the plain-tube specifications that are performed on unfinned lengths of tube in accordance with this specification need not be performed on
the plain tube.
4.3 The fins shall be produced by the cold forming of steel prime-surface tube. To comply with this specification, the fin and tube material must be homogeneous.
4.4 Finned tubes shall normally be furnished with unfinned ends, but may be furnished with finned ends if specified.
5. ASTM A498 Heat-Exchanger Integral Finned Tubes Heat Treatment
5.1 The tube after finning shall be supplied in either the annealed or as-fabricated condition, one of which shall be specified on the purchaser order.
5.2 The annealed condition is defined as having both the finned and unfinned portions of the tube conforming to the applicable heat-treatment requirements of the governing ASTM specification for the steel tube analysis involved.
5.3 The as-fabricated condition is defined as having the finned portions of the tube in the as-finned or cold-worked condition produced by the finning operation and the unfinned or plain tube portions of the finned tube in the as-fabricated condition suitable for rolling-in operations.
6. ASTM A498 Heat-Exchanger Integral Finned Tubes Chemical Composition
6.1 The steel shall conform to the chemical requirements prescribed in the governing plain-tube specification.
7. ASTM A498 Heat-Exchanger Integral Finned Tubes Tensile Requirements
7.1 The tube prior to the finning operation, or unfinned portions of the finned tube, shall conform to the requirements for tensile properties prescribed in the governing plain-tube specification.