摘要：2.1 铸铁基本代号应由该种类铸铁的汉语拼音的首位大写正体拉丁字母表示，灰铸铁、球墨铸铁、可锻铸铁和白口铸铁的代号分别用HT、QT、KT和BT表示。当两种铸铁名称的代号字母相同时，用该种类铸铁的汉语拼音的首位大写正体拉丁字母后加拼音的第二位小写字母，如蠕墨铸铁

GB/T 5612-2025 英文版/翻译版 铸铁牌号表示方法

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铸铁牌号表示方法

1 范围

本文件给出了铸铁分类和铸铁牌号的表示方法。

本文件适用于各种铸铁材料及铸铁件。

2 规范性引用文件

本文件没有规范性引用文件。

3 术语和定义

本文件没有需要界定的术语和定义。

4 铸铁分类及代号

4.1 铸铁分类

依据铸铁金相组织中的石墨颗粒形态和碳在铸铁中的存在形式，将铸铁分为灰铸铁、球墨铸铁、蠕墨铸铁、可锻铸铁和白口铸铁5大类。

4.2 铸铁代号

4.2.1 铸铁基本代号应由该种类铸铁的汉语拼音的首位大写正体拉丁字母表示，灰铸铁、球墨铸铁、可锻铸铁和白口铸铁的代号分别用HT、QT、KT和BT表示。当两种铸铁名称的代号字母相同时，用该种类铸铁的汉语拼音的首位大写正体拉丁字母后加拼音的第二位小写字母，如蠕墨铸铁表示为RuT。

4.2.2 特殊性能铸铁的代号，可由铸铁基本代号和排列在其后的用以表示该特殊性能的汉语拼音首位大写字母组成，如HTM代表耐磨灰铸铁，HTR代表耐热灰铸铁，HTS代表耐蚀灰铸铁。

4.2.3 特殊工艺生产的铸铁的代号，可由铸铁基本代号和排列在其后的用以表示该特殊工艺名称的其中一字或两字的汉语拼音首位大写拉丁字母组成，如QTD代表等温淬火球墨铸铁，HTLZ代表连续铸造灰铸铁。

4.2.4 各种类铸铁代号见6.2。

Designation of cast irons

1 Scope

This document outlines the classification and designation of cast irons.

This document is applicable to various cast iron materials and castings.

2 Normative references

There are no normative references in this document.

3 Terms and definitions

No terms and definitions are listed in this document.

4 Classification and codes of cast irons

4.1 Classification of cast irons

Based on the morphological characteristics of graphite particles in the metallographic structure of cast iron and the existing forms of carbon within cast iron, cast iron is classified into five major categories: gray cast iron, ductile (spheroidal graphite) cast iron, compacted graphite iron (CGI), malleable cast iron, and white cast iron.

4.2 Codes of cast irons

4.2.1 The basic code for each type of cast iron shall be represented by the initial uppercase Latin letter of its Chinese pinyin abbreviation. The codes for gray cast iron, ductile (spheroidal graphite) cast iron, malleable cast iron, and white cast iron are denoted as HT, QT, KT, and BT, respectively. When two types of cast iron share the same initial letter in their codes, the code for the specific type shall be formed by appending the second lowercase letter of its Chinese pinyin abbreviation after the initial uppercase letter. For example, compacted graphite iron (CGI) is denoted as RuT.

4.2.2 Codes for cast irons with special properties may be composed of the basic cast iron code followed by the initial uppercase Latin letter(s) of the Chinese pinyin abbreviation(s) representing the special property. For instance, HTM denotes wear-resistant gray cast iron, HTR represents heat-resistant gray cast iron, and HTS signifies corrosion-resistant gray cast iron.

4.2.3 Codes for cast irons produced by special processes may be formed by combining the basic cast iron code with the initial uppercase Latin letter(s) of the Chinese pinyin abbreviation(s) representing one or two key words in the name of the special process. For example, QTD denotes austempered ductile iron (ADI), and HTLZ represents continuously cast gray cast iron.

4.2.4 The designations of various types of cast iron are shown in 6.2.

来源：卡杰教育