tube 管上的印的英文是什么意思? tp = type tp = tube/pipe 或者 tubular product是许多人的误解。 转载 http:///viewthread.cfm?qid=80509&page=210 见如下的具体解释： although the only official astm mentions are in piping specifications, e.g., a312, it clearly refers to the austenitic alloy and not the form, e.g., as aisi grades also used in pressure vessels. see below. further, use of tp has been discontinued as redundant in ss grade specifying. see below.also, tp has never been used to designate tubular products of any other material (to my knowledge), although it would have been if it indeed indicated form. from astm a312/a312m-03 standard specification for seamless and welded austenitic stainless steel pipes"note 1—when the impact test criterion for a low-temperature service would be 15 ft-lbf [20 j] energy absorption or 15 mils [0.38 mm] lateral expansion, some of the austenitic stainless steel grades covered by this specification are accepted by certain pressure vessel or piping codes without the necessity of making the actual test. for example, grades tp304, tp304l, and tp347 are accepted by the asme pressure vessel code, section viii division 1, and by the chemical plant and refinery piping code, ansi b31.3, for service at temperatures as low as -425of [-250oc] without qualification by impact tests. other aisi stainless steel grades..."http:///cgi-bin/softcart.exe/database.cart/... " work item summarycopyright 2003 astm international. all rights reserved. wk1264 standard specification for seamless and welded austenitic stainless steel pipeswork item type: revision of a312/a312m-03 developed by subcommittee: a01.10 date initiated: 06-04-20031. rationale drop tp from grade names as serving no purpose . was identified as 012t-9.查看更多
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