The machinability (machinability, machinability) of die steel is the same as machinability, which refers to the difficulty of metal material being processed by cutting tool and becoming qualified workpiece. What are the factors that affect the machinability of die steel?

1.化学成分：钢的合金成分越高，就越难加工，当碳含量增加时，金属切削性能就下降。

The higher the carbon content of the steel, the more difficult the machinability.

2.钢的结构：不同的结构影响金属切削性能，如锻造.铸造.挤压.轧制和已切削加工过的，锻件和铸件有非常难于加工的表面。

2. Steel structure: different structures affect metal cutting properties, such as forging, casting, extrusion, rolling and machined, forgings and castings have very difficult to machine surfaces.

山东模具钢

shandong die steel

3.硬度：硬度是影响金属切削性能的一个重要因素，一般规律是钢越硬，就越难加工。高速钢（HSS）可用于加工硬度高为330-400HB的材料；高速钢+钛化氮（TiN）涂层，可加工硬度高为45 HRC的材料；而对于硬度为65-70 HRC的材料，则使用硬质合金.陶瓷.金属陶瓷和立方氮化硼（CBN）。

3. Hardness: hardness is an important factor affecting metal cutting performance. The general rule is that the harder the steel is, the harder it is to machine. High speed steel (HSS) can be used to machine materials with high hardness of 330-400hb; high speed steel + nitrogen titanate (TIN) coating can be used to machine materials with hardness of 45 HRC; and for materials with hardness of 65-70 HRC, cemented carbide, ceramics, cermet and cubic boron nitride (CBN) are used.

4.非金属参杂：一般对刀具寿命有不良影响。例如Al2O3（氧化铝），它是纯陶瓷，有很强的磨蚀性。

4. Nonmetal impurity: generally, it has adverse effect on tool life. For example, Al2O3 (alumina), which is a pure ceramic, has strong abrasion resistance.

5.残余应力：残余应力能引起金属切削性能问题，一般在粗加工后进行应力释放工序。

5. Residual stress: residual stress can cause metal cutting performance problems. It is generally recommended to carry out stress relief process after rough machining.