ISO 185-2020 pdf download.Grey cast irons – Classification.
For grey cast irons to be used in special applications, the chemical composition and heat treatment may be the subject of an agreement between the manufacturer and the purchaser.
7 Requirements
7.1 Mechanical properties The order shall specify, in an unambiguous manner, whether the characterizing property is tensile strength determined on cast samples or Brinell hardness determined on the casting, or both tensile strength and Brinell hardness. If the order does not specify the characterizing property, then the manufacturer shall characterize the material according to tensile strength.
7.2 Tensile properties
7.2.1 General The property values apply to grey cast irons cast in sand moulds or in moulds of comparable thermal behaviour. Subject to amendments to be agreed upon in the order, the property values may be applied to castings obtained by alternative methods. Tensile properties are dependent upon wall thickness as shown in Table 1. For process quality assurance purposes, standardized 30 mm test bars are commonly used. NOTE Tensile testing requires sound test pieces in order to guarantee pure uniaxial stress during the test.
7.2.2 Test pieces machined from cast samples The tensile properties of the eight grades of grey cast iron specified by tensile strength, when determined in accordance with 9. 1 using test pieces machined from cast samples, shall conform to the requirements specified in Table 1.
7.2.3 Test pieces cut from a casting If test pieces are to be machined from samples cut from a casting, the manufacturer and the purchaser shall agree on:
— the locations on a casting where the samples shall be taken;
— the minimum value or the allowable range of values for the tensile properties, when determined in accordance with 9. 1. NOTE1 The properties and the structure of castings are not uniform and depend on the complexity of the castings and their variation in section thickness.
NOTE2 Tensile properties for test pieces machined from samples cut from a casting are affected not only by material properties (subject of this document)but also by the local casting soundness(not subject of this document) .ISO 185 pdf download.