This standard specifies the designation, order information, production method and chemical composition, technical requirements, test pieces preparation, test methods, inspection rules, marking and quality certificates, rust prevention, packaging and storage of spheroidal graphite cast irons.
This standard is applicable to ordinary or low alloy ferritic to pearlitic spheroidal graphite east iron and solid solution strengthened ferritic spheroidal graphite east iron in sand moulds or moulds of comparable thermal behaviour. This standard may also be applicable to the spheroidal graphite cast iron produced by special casting methods.
This standard is not applicable to spheroidal graphite cast irons used for pipes, fittings, accessories and joints;
This standard is not applicable to austenitic spheroidal cast irons;
This standard is not applicable to ausferritic cast irons (austempered spheroidal graphite cast irons).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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 223.72 Iron steel and alloy - Determination of sulfur content - Gravimetric method
GB/T 223.83 Steel and iron - Determination of high sulfur content - Infrared absorption method after combustion in an induction furnace (GB/T 223.83-2009, ISO 13902:1997, IDT)
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace (GB/T 223.86-2009, ISO 9556:1989, IDT)
GB/T 228.1 Metallic materials - Tensile testing - Part 1 : Method of test at room temperature (GB/T 228.1-2010, ISO 6892-1:2009, IDT)
GB/T 229 Metallic materials - Charpy pendulum impact test method (GB/T 229-2007, ISO 148-1:2006, MOD)
GB/T 231.1 Metallic materials - Brinell hardness test - Part 1: Test method (GB/T 231.1-2018, ISO 6506-1:2014, MOD)
GB/T 231.2 Metallic materials - Brinell hardness test - Part 2: Verification and calibration of testing machines (GB/T 231.2-2012, ISO 6506-2:2005, MOD)
GB/T 231.3 Metallic materials - Brinell hardness test - Part 3: Calibration of reference blocks (GB/T 231.3-2012, ISO 6506-3:2005, MOD)
GB/T 5611 Foundry terminology
GB/T 5612 Code for representing cast iron (GB/T 5612-2008, ISO/TR 115931:2004, MOD)
GB/T 5677 Castings - Radiographic testing (GB/T 5677-2018, ISO 4993:2015, MOD)
GB/T 6060.1 Surface roughness comparison specimen - Part 1: Casting surface
GB/T 6414 Castings - System of dimensional tolerances, geometrical tolerancing and machining allowances (GB/T 6414-2017, ISO 8062-3: 2007, MOD)
GB/T 944 Metallographic test for spheroidal graphite cast iron (GB/T 9441-2009, ISO 945-1: 2008, MOD)
GB/T 9443 Steel and iron castings - Liquid penetrant inspection (GB/T 9443-2007, ISO 4987:1992, IDT)
GB/T 9444 Magnetic particle testing for steel castings (GB/T 9444-2007, ISO 4986:1992, IDT)
GB/T 11351 Mass tolerances for castings
GB/T 24234 Cast iron - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (Routine method)
GB/T 34904 Spheroidal graphite iron castings - Ultrasonic testing
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 5611 and the following apply.
3.1
spheroidal graphite cast iron
cast material, iron, carbon and silicon-based, the carbon being present mainly in the form of spheroidal graphite particles
3.2
ferritic to pearlitic spheroidal graphite east iron
spheroidal graphite cast iron with a matrix containing ferrite or pearlite or a combination of both
3.3
graphite spheroidizing treatment
spheroidizing treatment
process that brings the liquid iron into contact with a substance to produce graphite in the predominantly spheroidal (nodular) form during solidification
3.4
relevant wall thickness
section of the casting to which the determined mechanical properties shall apply
3.5
cast sample
quantity of material cast to represent the cast material, including separately cast sample, side-by-side cast sample and cast-on sample
3.6
side-by-side cast sample
sample cast in the mould alongside the casting, with a joint running system
3.7
solid solution strengthened
phenomena that solute atoms dissolve into the metal matrix to form a solid solution, which increases the strength and hardness of the metal
3.8
solid solution strengthened ferritic spheroidal graphite east iron
spheroidal graphite cast iron with a matrix mainly consisting of ferrite, solution strengthened by increasing the amount of silicon
3.9
test unit; inspection lot; test batch
number of pieces or the tonnage of castings to be accepted or rejected together, on the basis of the tests carried out on test pieces
4 Designation of spheroidal graphite cast iron
4.1 The spheroidal graphite cast iron, including ferritic to pearlitic spheroidal graphite east iron and solid solution strengthened ferritic spheroidal graphite east iron, shall be designated in accordance with GB/T 5612.
