GB/T 1348-2019 English PDF (GBT1348-2019)

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GB/T 1348-2019: Spheroidal graphite iron castings
GB/T 1348-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.140.80
J 31
Replacing GB/T 1348-2009
Spheroidal Graphite Iron Castings
(ISO 1083:2018, Spheroidal Graphite Cast Irons - Classification, MOD)
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: JULY 1, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative References ... 6 
3 Terms and Definitions ... 8 
4 Designations of Spheroidal Graphite Cast Iron ... 9 
5 Order Information ... 9 
6 Manufacturing Methods and Chemical Composition ... 10 
7 Technical Requirements ... 10 
8 Preparation of Test Specimens ... 17 
9 Test Methods ... 25 
10 Inspection Rules ... 28 
11 Marking and Quality Certificate ... 30 
12 Rust Prevention, Packaging and Storage ... 31 
Appendix A (informative) Structural Changes of this Standard Compared with
ISO 1083:2018 ... 32 
Appendix B (informative) Supplementary Information of Solid Solution
Strengthened Ferritic Spheroidal Graphite Cast Iron ... 34 
Appendix C (informative) Guideline Values of Mechanical Properties of Casting
Body Specimens ... 38 
Appendix D (normative) Difference of Elongation Measured when Lo = 5d and
Lo = 4d ... 41 
Appendix E (informative) Classification by Hardness ... 43 
Appendix F (informative) Spheroidization Rate (or spheroidal graphite ratio) 47 
Appendix G (informative) Mechanical Properties and Physical Properties of
Spheroidal Graphite Cast Iron Materials ... 48 
Appendix H (informative) Procedures of Cutting Test Specimens ... 51 
Appendix I (informative) A Comparison Table of Material Designations of
Domestic and Overseas Spheroidal Graphite Cast Iron ... 52 
Spheroidal Graphite Iron Castings
1 Scope
This Standard specifies the designations, order information, manufacturing methods,
chemical composition, technical requirements, sample preparation, test methods,
inspection rules, marking, quality certificate, rust prevention, packaging and storage of
spheroidal graphite iron castings.
This Standard is applicable to ordinary or low-alloy ferritic to pearlitic spheroidal
graphite iron castings and solid solution strengthened ferritic spheroidal graphite iron
castings cast in sand molds or casting molds with thermal conductivity equivalent to
sand molds. Spheroidal graphite iron castings manufactured through special casting
methods may also take this Standard as a reference.
This Standard is inapplicable to spheroidal graphite cast iron pipes, spheroidal graphite
cast iron pipe fittings, parts and joints;
This Standard is inapplicable to Austenitic spheroidal graphite cast iron;
This Standard is inapplicable to Ausferrite spheroidal graphite cast iron (austempered
spheroidal graphite cast iron).
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 223.3 Methods for Chemical Analysis of Iron, Steel and Alloy - The Diantipyryl
Methane Phosphomolybdate Gravimetric Method for the Determination of
Phosphorous 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 34904 Spheroidal Graphite Iron Castings - Ultrasonic Testing
3 Terms and Definitions
What is defined in GB/T 5611, and the following terms and definitions are applicable to
this document.
3.1 Spheroidal Graphite Cast Iron
Spheroidal graphite cast iron refers to cast iron with iron, carbon and silicon as the
basic elements, and with carbon mainly exists in the form of spheroidal graphite.
3.2 Ferritic to Pearlitic Spheroidal Graphite Cast Iron
Ferritic to pearlitic spheroidal graphite cast iron refers to spheroidal graphite cast iron
which contains ferrite or pearlite, or a mixed matrix of ferrite and pearlite.
3.3 Graphite Spheroidizing Treatment
Spheroidizing Treatment
Graphite Spheroidizing treatment refers to a technological process, in which,
spheroidizing agent is added to molten iron, so that carbon mainly precipitates in the
form of spheroidal graphite during the solidification of the molten iron.
3.4 Relevant Wall Thickness
Relevant wall thickness refers to the section thickness of casting representing the
mechanical properties of the casting materials.
3.5 Cast Sample
Cast sample refers to a test specimen representing the properties of the casting
materials, including single-cast sample, side-by-side cast sample and attached cast
sample.
3.6 Side-by-side Cast Sample
Side-by-side cast sample refers to a cast sample that uses the same casting system
as the casting and is cast side by side with the casting.
3.7 Solid Solution Strengthened
Solid solution strengthened refers to the phenomenon 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 Cast Iron
a) Designation of casting materials;
b) Any special requirements (including the location of the relevant wall thickness)
shall be negotiated and determined by the demand-side and the supply-side.
5.2 All order requirements shall be negotiated and determined by the demand-side and
the supply-side at the same time that the order is accepted.
6 Manufacturing Methods and Chemical Composition
6.1 The manufacturing methods and chemical composition of spheroidal graphite cast
iron shall be determined by the supply-side on its own. The chemical composition of
spheroidal graphite cast iron shall not be used as the basis for the acceptance
inspection of castings.
6.2 In terms of ferritic to pearlitic spheroidal graphite iron castings, the degree of the
mechanical properties depends on the ratio of ferrite to pearlite. Generally speaking,
the ratio of ferrite to pearlite is adjusted through the adjustment of the alloy content or
the mode of thermal treatment.
6.3 The mechanical properties of solid solution strengthened ferritic spheroidal
graphite cast iron depend on the degree of solid solution strengthening of the ferrite
matrix. The degree of solid solution strengthening mainly depends on the silicon
content. The chemical composition and physical properties of solid solution
strengthened ferritic spheroidal graphite cast iron may take Appendix B as a reference.
7 Technical Requirements
7.1 General Rules
7.1.1 The performance index values listed in this Standard are the performance values
of spheroidal graphite cast iron cast with sand molds or casting molds with thermal
conductivity equivalent to sand molds. Upon agreement between the demand-side and
the supply-side, it may also be used for spheroidal graphite cast iron cast by other
methods.
7.1.2 The designation of casting materials is determined based on the minimum
mechanical properties of a cast sample with a thickness or diameter of 25 mm. The
designation i...