在过去的几年里不锈钢焊管的感应退火已被应用于一些钢管制造厂的实际生产中。然而甚至到现在大多数的退火加工仍在燃气加热炉或电加热炉中进行并需要长时间的保温均热。这两类炉子中加工过程都会导致无光泽的表面,并出现氧化皮。结果,这样加工出来的管子需要经酸洗和表面处理。感应退火因加热时间较短而产生较少的氧化皮,但是随之而来的水淬(淬火的时间应尽可能地
Designation: B 68 –02 Standard Speci?cation for Seamless Copper Tube, Bright Annealed 1 This standard is issued under the ?xed designation B 68; the number immediately following the designation indicates the year of original adoption or, in the caseof revision, the year of last revision. A number in parenthesesindicates the year of last reapproval. A superscript epsilon (e) indicates an editorial