ISO 17804-2020 pdf free.Founding — Ausferritic spheroidalgraphite cast irons — Classification.
This document specifies five grades of ausferritic spheroidal graphite cast iron by a classification basedon mechanical properties determined on machined test pieces prepared from:
-separately cast samples, side-by-side cast or cast-on samples;
-samples cut from a casting.
This document also specifies two grades by a classification as a function of hardness.
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references,only the edition cited applies.Forundated references, the latest edition of the referenced document (including any amendments) applies.
ISO 148-1, Metallic materials —Charpy pendulum impact test — Part 1: ‘Test method.
ISO 945-1, Microstructure of cast irons — Part 1: Graphite classification by visual analysisISO 6506-1, Metallic materials — Brinell hardness test – Part 1: Test method.ISO6892-1, Metallic materials —Tensile testing — Part 1: Method of test at room temperatureISO/TR 15931, Designation system for cast irons and pig irons.For the purposes of this document, the following terms and definitions apply.
austempering<of spheroidal graphite cast iron> heat treatment process,consisting of heating the castings to atemperature at which austenite starts to form during heating and holding a sufficient time for carbondiffusion into the austenite, followed by cooling at a rate sufficient to avoid the formation of pearlite,and transforming the matrix structure for a time and a temperature (above the martensite starttemperature) sufficient to produce the desired properties.Note 1 to entry:This process produces a microstructure that consists predominantly of ferrite and high carbonaustenite.This microstructure is called “ausferrite”. Examples of ausferritic microstructures are given inISO/TR 945-3[1].
ausferrite:cast iron microstructure, produced by a controlled thermal process, which consists of predominantlyacicular ferrite and high carbon austenite.
cast sample:quantity of material cast to represent the cast material, including separately cast samples, side-by-sidecast samples and cast-on samples.
relevant wall thickness:section of the casting, agreed between the manufacturer and the purchaser, to which the determinedmechanical properties apply
Note 1 to entry: Relevant wall thickness may be associated with a range of casting sections and/or with asample type and size according to Table 3.The association is made by considering the cooling conditions duringsolidification and heat treatment.ISO 17804 pdf download.