Steel is a common material in our daily life. If the service performance of steel is higher, there may be less sundries, and on the contrary, there will be more sundries. What are the common sundries in steel?
The main non-metallic sundry materials in the steel can be divided into internal inclusions in the external clip box. Endogenous inclusions are inevitable. China Standard Parts Network will share the types and characteristics of common sundry materials in steel.
1.oxide: common oxide FeO, MnO, si02:, Al2O3, Cr203 and so on. Most of the oxides are brittle inclusions with very low plasticity, large fragility and easy fracture. After rolling and forging, they are arranged in series or point chains along the direction of processing, and they are gray under bright field. Poor polishing and easy peeling, as shown in Figure 4-12.
2.sulfide: such as MnS, Fes, etc., better plasticity, is a plastic inclusion. After rolling and forging, it deforms along the direction of machining and shows spindle shape or line segment shape. Under the bright field is light gray. Good polishing, not easy to peel, as shown in Figure 4-13.
3.silicate: silicate with easy deformation (such as 2MnO.siO2), there is not easy to deformation. The easily deformable silicate inclusions are similar to sulfide, extending along the processing direction and deformed in line segments, and they are gray or dark gray under bright field. Not easy to deform silicate and oxide similar, along the processing direction is granular distribution, light field is also dark gray. For quantitative rating, brittle silicates are rated as oxides while plastic silicates are rated as sulfides.
4. punctate non-deformed inclusions: referred to as punctate inclusions, chromium bearing steel punctate inclusions are mainly composed of magnesium spinel and calcium containing aluminate or silicate containing aluminum, calcium, manganese. The non-deformable inclusions do not deform after processing and exist in the form of dots (balls), as shown in Figure 4-14.
5.chloride: commonly encountered chloride mixed with A1N, TiN, VN, ZrN, etc., their shape is generally more regular, more square, rectangular, triangular, etc. No deformation in pressure machining. It is light yellow, golden or rosy under the bright field.
