Focus on recent developments in the domestic die steel – Anal Speculum – ENT Med
At present, China mold wider selection of steel, in addition to tool steel (carbon tool steel, alloy tool steel, high-speed tool steel), there are bearing steel, spring steel, quenched and tempered steel, hardened steel, stainless steel and so on, steel up to Dozens of many, but only 20 kinds of commonly used, but only use a maximum of eight kinds: Cr12, Cr12MoV, CrWMn, 3Cr2W8V, 5CrMnMo, SCrNIMo, 45,40 Cr. It is estimated that the eight-year steel die steel in China with the accounting for the total amount of 80%.
With the development of industrial production and less, non-cutting technique widely used for die steels made more and higher requirements for commonly used steels can not fully meet the needs of the urgent need for the development and application of new die steel
The new steel grades to meet the high mechanical properties of the mold, special process performance and special-use performance requirements, resolving the mold design, processing, use some of the problems, substantial increase in the mold life, to bring very significant economic and social benefits, for industrial development and less widely used non-cutting process has played a significant role in promoting. But a variety of adverse factors, the application of the new die steel was still relatively small, the annual amount equivalent to only the total amount of die steel in 1 / 40 ~ l / 50. Of course, every year of its use still on the upside.
90 years, China's mold industry entered a rapid development period, which greatly promoted the die steel production and application technology. Through the introduction of advanced equipment and technology, has been able to produce high-quality die steel, and some kinds of metallurgical quality of steel has reached the international advanced level and have a small amount of exports in the international community enjoys a certain reputation. It should be noted that China's steel production mold, the application of the overall level is still low, there are many long-standing unresolved issues. The vast majority of Chinese-made electric steel die steel, steel composition segregation great purity low-carbon-level high, loose-level exceeding the standard to the performance of the module are significant differences between vertical and horizontal.
Die Steel Materials utilization is low, because the steel rod material in more than 85%, saw materials, changes in the consumption of large forging; module, flat steel, plates and other varieties of small, boutique, products with less. Forging die steel to change poor performance, the vast majority of change only die forging billet to the shape, size for the purpose of the neglect of organizational improvement, resulting in mold billet will retain a super-level carbon and a negative flow of line distribution. Mold material selection and heat treatment is also inappropriate application of a die steel outstanding problems. Mold design, manufacturers are not familiar with material and heat treatment, heat treatment and technical personnel are not familiar with the die working conditions, often caused by selection or heat treatment process is not and die match.
In addition, lax implementation of heat treatment, heat treatment equipment and processes, backward, improper operation caused by mold deformation, cracking, is widespread. Survey shows that die due to improper material selection and heat treatment early failure accounted for about 70%. Surface mold on the application, in addition to carburizing, nitriding, the other expanding penetration processing (infiltration non-metallic, surface alloying) applications, very little coating and spray fewer processing applications. Some applications also often inappropriate due to the type and process selection, achieving the desired effects, and even not only useless but harmful and die steel application technology to become a weak link.
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