ZG230-450是一种铸造碳钢的牌号。“ZG”代表铸钢的拼音缩写，而“230”和“450”则分别表示铸钢件的屈服强度为230Mpa，抗拉强度为450Mpa，属于ZG230-450是一种铸造碳钢的牌号。
1. ZG230-450 represents a casting carbon steel grade.2. The prefix "ZG" signifies the casting steel in Chinese拼音.3. The numbers "230" and "450" denote the yield strength and tensile strength of the casting, respectively.