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Sales of Sweden ASSAB and imported special steel, powder high speed steel ASP-23, ASP-60, high speed steel SKH-9, tungsten steel, VIKING, ELMAX, DC53, SDK11, SKD61 and other punch materials.
The high metallurgical quality can give full play to the basic properties of the steel. The internal metallurgical quality of the die steel is of equal importance to its basic properties. While studying the performance, it is necessary to study the factors affecting the metallurgical quality. Experts believe that the internal and external quality problems of mold steel are generally encountered in the following aspects:
1 chemical composition uniformity
Die steel is usually alloy steel containing multi-element. When steel is solidified from liquid in the ingot mold, due to the selective crystallization, various elements in the molten steel are unevenly distributed in the solidified structure to form segregation. The segregation will result in differences in organization and performance, and it is one of the important factors affecting the quality of steel. Reducing the degree of segregation of steel can effectively improve the performance of steel. In recent years, many metallurgical plants at home and abroad have been working hard to produce steel with uniform composition and fine structure.
Sales of Sweden ASSAB and imported special steel, powder high speed steel ASP-23, ASP-60, high speed steel SKH-9, tungsten steel, VIKING, ELMAX, DC53, SDK11, SKD61 and other punch materials.
2 harmful element content
Sulfur and phosphorus form phosphides and sulfides in the solidification process of steel and precipitate at the grain boundaries, thus producing intergranular brittleness, which reduces the plasticity of the steel. Excessive S and P contents may cause cracks in the ingot during rolling. And will greatly reduce the mechanical properties of steel. The effects of S and P content on the toughness and thermal fatigue properties of W(Cr) 5% hot work die steel (H13) were studied. The results show that the content of W(S, P) is reduced from 0.025% and 0.010% to W. (P) 0.005% and W(S) 0.001%, the length and number of thermal fatigue cracks will be reduced by half. When Guanding Metal Co., Ltd. reduced the W(P) content of SKD61 steel from 0.03% to 0.001%, the impact toughness of steel at 45HRC was increased from 39.2J/cm2 to 127.5J/cm2. In addition, reducing the S and P contents in the steel can also effectively improve the isotropic properties of the steel.
3 non-metallic inclusions in steel
The quality of the steel is not only in accordance with the technical standards, but also the content of non-metallic inclusions in the steel should be as small as possible, because the volume of non-metallic inclusions in steel is small, but for steel. The performance impact is great. Reducing non-metallic inclusions in steel is one of the main tasks of steelmaking. Generally referred to as non-metallic inclusions in steel, mainly refers to compounds formed by the action of iron and other alloying elements with oxygen, sulfur, nitrogen, etc., such as FeO, MnO, Al2O3, SiO2, FeS, MnS, AlN, VN, etc. And refractory materials brought in steelmaking and casting, the latter components are also mainly oxides of Si, Al, Fe, Cr, Ca, Mg, and the like. The non-metallic inclusions in steel can be classified into intrinsic inclusions and foreign inclusions. The current inclusions are compounds formed by steel in liquid and solidification processes.
Sales of Sweden ASSAB and imported special steel, powder high speed steel ASP-23, ASP-60, high speed steel SKH-9, tungsten steel, VIKING, ELMAX, DC53, SDK11, SKD61 and other punch materials.
The non-metallic inclusions in steel are considered to be cracks of a certain size in the basic sense. It destroys the continuity of the metal and causes stress concentration. Under the action of external stress, the crack extension is easy to develop and expand and lead to performance. reduce. The presence of plastic inclusions, as the forging process is extended and deformed, causes anisotropy in the steel. At the same time, the peeling during the polishing of the inclusions improves the surface roughness of the mold. Therefore, for large and important molds, it is important to improve the purity of the steel.
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