Ductile Cast Iron material inspection standard and quenching in heat treatment

- Nov 08, 2018 -

Ductile Cast Iron, which is a material that is often used, is widely used and can be used in different industries. Therefore, it is necessary to familiarize and understand, so that you can know how to use it properly and get good quality products. Thereby, the product has good performance and use effect.


1. Is there a difference between Ductile Cast Iron and ductile casting?

Ductile casting, which is a casting process, is a casting process using a spheroidizing agent and molten iron, and is obtained by spheroidal casting to obtain a desired desired product. Ductile Cast Iron, this is a material, so the two are different. Although they have similarities in name, they are two different concepts and cannot be mistaken in selection and use.


2. How to express the code of various cast iron? What about Ductile Cast Iron?

The code name of various cast irons is generally composed of the first uppercase and normal letters of the Chinese pinyin letters indicating the characteristics of the cast iron. When the code letters of the two cast iron names are the same, the lowercase normal letters can be added after the uppercase normal letters. the difference. The cast iron of the same name, if it needs to be subdivided, is the first capitalized normal letter of Chinese Pinyin with its subdivision characteristics, and it is arranged behind. While spheroidal graphite cast iron, which is a specific type of cast iron, it is also a rule of the cast iron code.


3. Ductile Cast Iron material inspection standard and its hardness and toughness

The test standard for Ductile Cast Iron is to comply with the two standards of GB1348 and EN1563:1997. The mechanical properties, spheroidization rate and cementite content are used as the basis for acceptance, hardness and other metallographic structures and chemical compositions are used as reference. Among them, its mechanical properties mainly refer to two parameters of tensile strength and elongation.


The Rockwell hardness of Ductile Cast Iron is mainly related to the grade of the material from the professional point of view. Its common Rockwell hardness is 130-220HB. In addition, it is required to refer to the GB/T1348-2009 standard, and different grades correspond to different hardness and toughness.


4. Heat treatment of Ductile Cast Iron

A material of nodular cast iron, which has the composition of spherical graphite, so the mechanical properties of the material are related to the microstructure of the matrix, and the mechanical properties of the Ductile Cast Iron can be significantly improved by heat treatment. In the quenching method, it can be either surface hardening or integral quenching. Which one is chosen is determined by the actual situation and the quenching requirements. Moreover, Ductile Cast Iron can be quenched as a whole, and is also a characteristic different from gray cast iron.http://www.xihuafoundry.com/