ISO 185-2020 pdf free download.Grey cast irons – CI assification.
The material shall be designated as given in either Table 1 or Table 2. The designation system is given in ISO/TR 15931.
The number in position 3 of the designation in Table 1 is the minimum tensile strength of the grade as determined by test pieces machined from standardized 30 mm test bars or from cast samples of corresponding relevant wall thickness.
The number in position 3 of the designation in Table 2 is the maximum Brinell hardness value of the grade for relevant wall thickness > 40 mm to 80 mm.
5 Order information
The following information shall be supplied by the purchaser:
a) the complete designation of the material;
b) any special requirements that have to be agreed between the manufacturer and the purchaser. All agreements between the manufacturer and the purchaser shall be made by the time of acceptance of the order.
6 Manufacture
Unless otherwise specified by the purchaser, the method of manufacture of grey cast irons, including their chemical composition, to obtain the specified mechanical properties shall be left to the discretion of the manufacturer.
The manufacturer shall ensure that the requirements of this document are met for the material grade specified in the order.
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.
NOTh 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.],
NOTE 1 The properties and the structure of castings are not uniform and depend on the complexity of the castings and their variation in section thickness.ISO 185 pdf download.
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