GB/T 5612-1985 Method for indicating cast iron grades GB/T5612-1985 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Method for representing cast iron grades
Code for representing cast iron grades
1.1 Codes for various cast irons
UDC 621.741.2
1.3: 00*, pulse 2
GB 5612-05
The code for a particular cast iron is composed of the first capital letter of the Chinese phonetic character representing the characteristics of the cast iron. When the code letters of two cast iron names are the same, lowercase letters can be added after the capital letter to distinguish them. When the same name iron needs to be subdivided, the first capital letter of the Chinese phonetic character representing the subdivision characteristics is taken and arranged at the back. The code is shown in Appendix A (Supplement). 1.2 Element symbols, nominal content and mechanical properties The symbols of alloying elements are represented by international chemical element symbols, and the symbols of mixed rare earth elements are represented by "R". Content and mechanical properties are represented by Arabic numerals.
1.2.1 In the grade, the conventional carbon, silicon, manganese, sulfur and phosphorus elements are generally not marked. When they have special functions, their element symbols and content are marked.
1.2.2 When the alloying element content is greater than or equal to 1%, it is expressed as an integer. When it is less than 1%, it is generally not marked. It is only marked when it has a significant impact on the characteristics of the alloy. 1.2.3 Alloying elements are arranged in descending order of their content. When the content is equal, they are arranged in alphabetical order of the element symbols. 1.2.4 The rounding rules for the content in the grade shall be in accordance with Appendix C of GB 1.1-81 "General Provisions for the Preparation of Standards in Standardization Work Guidelines". 1.2.5 The group of numbers after the code in the grade indicates the tensile strength value. When there are two groups of numbers, the first group indicates the tensile strength value and the second group indicates the elongation value. The two groups of numbers are separated by "". 1.2.6 When the symbol and content of the element are marked in the grade and the tensile strength is also marked, the tensile strength value is placed after the element symbol and content, separated by "-".
Technology example
Elongation (%)
Tensile strength (N/mm2)
Code for ductile iron
STSi15Mo4Cu
Element symbol for copper
Nominal percentage content of zinc
Element symbol for molybdenum
Nominal percentage content of silicon
Element symbol for silicon
Code for corrosion-resistant cast iron
Published by the National Bureau of Standards on November 25, 1985
Implementation on August 1, 1886
MTCu1PTi- 15
GB 5612—85
Tensile strength (N/mm2)
Element symbol for titanium
Element symbol for phosphorus
Nominal percentage of copper
Element symbol for copper
Code for wear-resistant cast iron
GB 5612-85
Appendix A
Name, code and designation method for cast iron (supplement)
Examples of the names, codes and designations of various cast irons are shown in the following table. Cast iron name
Inlaid cast ironwww.bzxz.net
Mite iron
Ductile cast iron
Blackheart malleable cast iron
Self-center malleable cast iron
Pearlite malleable diamond iron
Phosphorus-resistant cast iron
Wear-resistant white cast iron
Wear-resistant ductile cast iron
Chilled cast iron
Corrosion-resistant iron
Corrosion-resistant ductile cast iron
Heat-resistant chromium iron
Heat-resistant ductile cast iron
Austenitic cast iron
Additional instructions:
Example of brand representation method
RuT400
QT 400 - 17
KTH300-06
KTB 350 - 04
KTZ450-06
MTCu1PTi-150
KmTBMn5 Mo2Cu
KmTQMn6
ITCr MoR
5TS:15R
STQA15S1 5
RTQAI6
This standard is proposed by the Ministry of Machinery Industry of the People's Republic of China and is under the jurisdiction of Shenyang Foundry Research Institute of the Ministry of Machinery Industry. Shenyang Foundry Research Institute of the Ministry of Machinery Industry and other units are responsible for drafting this standard. From the implementation of this standard, the "--, classification and grade" in GB976-67 "Classification and Technical Conditions of Gray Castings" and the "--, classification" in GB978- "Classification and Technical Conditions of Forgeable Castings" will be invalid. The main drafters of this standard are Zhang Xiaokong, Lian Jinjiang and Wang Hu.
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