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ASTM E426-1998(2007)
Standard Practice for Electromagnetic (Eddy-Current) Examination of Seamless and Welded Tubular Products,Austenitic Stainless Steel and Similar Alloys
适用范围:<p>Eddy-current examination is a nondestructive method of locating discontinuities in a product. Changes in electromagnetic response caused by the presence of discontinuities are detected by the sensor, amplified and modified in order to actuate audio or visual indicating devices, or both, or a mechanical marker. Signals can be caused by outer surface, inner surface, or subsurface discontinuities. The eddy-current examination is sensitive to many factors that occur as a result of processing (such as variations in conductivity, chemical composition, permeability, and geometry) as well as other factors not related to the tubing. Thus, all received indications are not necessarily indicative of defective tubing.</p><p id="s00002">1.1 This practice covers procedures that may be followed for eddy-current examination of seamless and welded tubular products made of stainless steel and similar alloys such as nickel alloys. Austenitic chromium-nickel stainless steels, which are generally considered to be nonmagnetic, are specifically covered as distinguished from the martensitic and ferritic straight chromium stainless steels which are magnetic.</p> <p id="s00003">1.2 This practice is intended as a guide for eddy-current examination of both seamless and welded tubular products using either an encircling coil or a probe-coil technique. Coils and probes are available that can be used inside the tubular product; however, their use is not specifically covered in this document. This type of examination is usually employed only to examine tubing which has been installed such as in a heat exchanger.</p> <p id="s00004">1.3 This practice covers the examination of tubular products ranging in diameter from 0.125 to 5 in. (3.2 to 127.0 mm) and wall thicknesses from 0.005 to 0.250 in. (0.127 to 6.4 mm).</p> <p id="s00005">1.4 The values stated in inch-pound units are to be regarded as the standard.</p> <p id="s00006">1.5 <span class="italic">This standard does not purport to address all of the safety problems, 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 use.</span>
实施日期: 1998-12-10
中标分类号: J33 - 机械 - 焊接与切割
ICS分类号: 23.040.10 - 流体系统和通用部件 - 铁管和钢管
标准组织: ASTM - 美国材料与试验协会标准
全文来源: WF
英文关键词: alloy austenitic chromium-nickel stainless steels austenitic stainless steels conductivity discontinuities eddy-current electromagnetic encircling coil hall element non-magnetic steels probe coil seamless tubular products tubular product welded tubular products Austenitic stainless steel tube Discontinuities--metals/alloys Eddy current examination Electromagnetic (eddy current) testing Stainless steel tube Steel tube (nondestructive testing) Structural steel (SS) tube
语种: 汉语
页数: 4
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