DIN50602-Microscopic-examination-of-special-steels-using-standard-diagrams-to-assess-the-content-of-non-metallic-inclusions

UDC669.14:620.186.14DEUTSCHE NORMSeptember 1985Metallographic examinationMicroscopic examination of special steels西using standard diagrams to assess thecontent of non-metallic inclusions50602Metallographische Prufverfahren;mikroskopische Prufung von Edelstahlen auf nichtmetallische Einschlussemit BildreihenIn keeping with current practice in standards published by the International Organization for Standardization (ISO),a comma has been used throughout as the decimal marker.ContentsPagePage1Scope and field of application..............16 Structure and use2Concepts.............................2of standard diagram plates................33Designation of method'..................7 Test procedure........................54 Scope of test ........................38 Evaluation using methods M and K..........6145 Sampling and preparation of specimens........3 9 Test report .........................81 Scope and field of applicationform of sheet and strip and other products of small1.1 This standard describes the examination of specialthickness and also forgings in which the fibres do notsteels for non-metallic inclusions of sulfidic and oxidicrun in a straight line,special features need to be takennature.Both macroscopic and microscopic methods areinto account and agreements reached with regard toused for this purpose.Microscopic examination can besampling and evaluation.carried out using a metallurgical microscope and auto.matic devices.It has not been possible to standardize1.4 For steels influenced by the form of sulfideinstrumentation for automatic evaluation of micrographsinclusions,a Stah/-Eisen-Priifblatt (iron and steel testbecause development of such instruments is not yetsheet)is currently being prepared,which will take intocomplete.This standard specifies a method to be appliedaccount the length/width ratio of the inclusions.for microscopic examination using a metallurgicalmicroscope and a set of standard diagrams arranged in a1.5 Stahl-Eisen-Priifblatt 1572 Mikroskopische Priifungsystematic sequence,which enables the micrograph to bevon Automatenstahlen auf sulfidische,nicht metallischedescribed on the basis of the type and size of inclusionEinschlisse mit Bildreihen)(Microscopic examination(length and width or diameter)and the frequencyof free-cutting steels using standard diagrams to assess(standard diagram plate 1).An index proportional to thethe content of non-metallic sulfide inclusions)shall becontent of inclusions from a specified limit size upwardsused for examination of "free-cutting steels"on thecan be calculated separately for the oxide and sulfidebasis of the shape,size and distribution of thecomponents or as a total value.There is also provisionnon-metallic inclusions.for determining maximum sizes.1.6 It is not within the scope of this standard to specify1.2 By agreement,the standard may also be applied tomaximum permissible contents or evaluation ofother steels.non-metallic inclusions with a view to determining thein the case of low