This standard specifies terms/definitions, designation, technical requirements, sampling requirements, test methods, test rules, marking, packing and storage / transportation of gray iron castings.
This standard is applicable to grey iron castings casted in sand mould or moulds with the heat conductivility same to sand mould, and the grey iron castings casted with other moulds may reference to this standard.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to, or revisions of, any of these publications do not apply. Parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For undated references, the latest editions of the normative documents are applicable to this standard.
GB/T 223.3 Methods for chemical analysis of iron, steel and alloy -the diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content
GB/T 223.4 Alloyed steel-Determination of manganese content-Potentiometric or visual titration method
GB/T 223.60 Methods for chemical analysis of iron steel and alloy the perchloric acid dehydration gravimetric method for the determination of silicon content
GB/T 228 Metallic materials-Tensile testing at ambient temperature (GB/T 228—2002, eqv ISO 6892:1998)
GB/T 231.1 Metallic materials-Brinell hardness test-Part 1: Test method (GB/T 231.1-2009, ISO 6506-1: 2005, MOD)
GB/T 231.1 Metallic materials-Brinell hardness test-Part 1: Test method (GB/T 231.1-2009, ISO 6506-1:2005, MOD)
GB/T 231.3 Metalic Brinell hardness test-Part 3: Calibration of hardness reference blocks (GB/T 231.3-2002, ISO 6506-3: 1999, MOD)
GB/T 4336 Standard test method for spark discharge atomic emission spectrometric analysis of carbon and low-Alloy steel (routine method)
GB/T 5611 Foundry terminology
GB/T 5612 Code for representing cast iron (GB/T 5612-2008, ISO 15931: 2004, MOD)
GB/T 5677 Radiographic testing for steel castings (GB/T 5677-2007, ISO 4993: 1987, IDT)
GB/T 6060.1-1997 Roughness comparison specimens-Cast surfaces (GB/T 6060.1-1997, eqv ISO 2632-3: 1979)
GB/T 6414 Castings-System of dimensional tolerances and machining allowances (GB/T 6414-1999, eqv ISO 8062: 1994)
GB/T 7216 Metallographic test for gray cast iron (GB/T 7216-2009, ISO/DIS 945-1: 2008, MOD)
GB/T 7233.1 Steel castings-Ultrasonic examination-Part 1: Steel castings for general purposes (GB/T 7233.1-2009, ISO 4992-1: 2006, MOD)
GB/T 9444 Magnetic particle testing for steel castings (GB/T 9444-2007, ISO 4986: 1992, IDT)
GB/T 11351 Mass tolerances for castings
3 Terms and Definitions
The terms specified in GB/T 5611 as well as the following terms and definitions apply in this standard.
Relevant wall thickness
Section thickness of the casting, agreed between the supply and demand parties, to which the determined mechanical properties apply
4 Designations of Gray Iron Castings
The denotation method for material designation in this standard shall comply with the requirements GB/T 5612.
In this standard, based on the minimum tensile strength measured from the standard tensile test pieces processed by φ 30mm separately cast test pieces, gray iron castings are divided into ones respectively with the designations HT100, HT150, HT200, HT225, HT250, HT275, HT300 and HT350 (see Table 1).
