In industrial production, the corresponding grade of H13 in China is 4Cr5MOSIV1, which is the most widely used hot work die steel. In the process of use, many people will have questions: are H13 and SKD61 the same kind of steel? What is the difference between them?
In fact, SKD61 and H13 belong to the same type in terms of steel types, and they are both variants of the international standard AISI H13. However, SKD61 is a Japanese grade, while H13 is an American grade, and there are still some differences in their material composition, hardness, strength and use characteristics.
1.The proportion of ingredients varies slightly.
The composition of SKD61 includes carbon (0.).35-0.42%), silicon (0.80-1.20%), manganese (0.50% or less), chromium (300-4.50%), molybdenum (100-1.50%), cobalt (250-3.50%) and tungsten (150-2.50%）。The composition of H13 includes carbon (0.).32-0.45%), silicon (0.80-1.20%), manganese (0.20-0.50%), phosphorus (003% or less), sulfur (0.03% or less), chromium (475-5.50%), molybdenum (110-1.75%) and cobalt (0.).80-1.20%）。
2.There is a difference in hardness and strength.
Because SKD61 contains more cobalt and tungsten, it has higher hardness and heat resistance than H13. Therefore, in high-temperature environments, SKD61 has better stability and longer service life. H13, on the other hand, has higher strength and abrasion resistance.
3.There is a difference in the characteristics of use.
Due to its higher hardness and heat resistance, SKD61 is suitable for high-temperature, high-pressure and heavy-duty molds, extrusion molds and die-casting molds. H13 has better wear resistance and strength, so it is more suitable for use in cold molds, hot molds, forging dies and templates.
To sum up, although SKD61 and H13 belong to the same type of steel, there are still some differences in terms of composition ratio, hardness and strength, and use characteristics.
Of course, in addition to SKD61 and H13, there are many other kinds of hot work die steels to choose from. When choosing, it is necessary to select the most suitable steel according to the specific use environment and needs, comprehensively considering the composition, hardness, strength, wear resistance, heat resistance and other factors of the steel. At the same time, it is also necessary to pay attention to the processing and heat treatment process of the steel to ensure that the performance of the steel is fully utilized, so as to achieve the best use effect.