Our steel application situation and developing technology

Current materials widely used steel mold, besides, alloy steel (carbon tool steel, high speed steel) outside, still have a bearing steel, spring steel, steel, carbon steel, stainless steel castings, of dozens of many, but the commonly used only 20, but only eight kinds of the most amount Cr12: Cr12MoV, CrWMn, 3Cr2W8V, 5CrMnMo, SCrNIMo, 45, 40Cr,. According to estimation, the dosage of steel grade eight years of our total amount in 80% of steel.

With the development of industrial production, process and less widely used for cutting tool performance, put forward higher requirement, more commonly, have not fully satisfy need castings, need to research and application of new steel.

In recent years, China has developed a new tool of nearly 200, such as hard as W10Mo4Cr4V3A1 HSS, W6Mo5Cr4VsiA1Nb, Wear-resistant steel 7Cr7Mo2V2Si, Cr8MoV2Ti fortitude, etc. HSS matrix 65W3Mo2Cr4VNb steel 5OMo3Cr4SiMnAl, etc, High strength carbon steel 4Cr5Mo2MnVSi, 4Cr3MoMnVNbB etc, 25Cr3NiMoAl steel 10Ni3MnCuAl, such limitation, Flame 7CrSiMnMoV harden steel 7Cr2, etc SiMnMoV suvs, Cutting tool 8Cr2MnWMoVS 5CrNiMnMoVSCa, etc. Also introduced the general several American steel grade, such as Cr12MolV1 H13), (D2), 4Cr5MoV1Si (P20 (3Cr2Mo), etc. The mould castings meet new high mechanical properties, special process performance and special performance requirements, solve the mould design, processing and use of some problems, and greatly improve the service life of dies, very remarkable economic and social benefits, and the industrial development and less widely, cutting technology plays a great role in promoting. But because of the influence of factors, the YingYongLiang still fewer new steel, alloy, dosage is only in the total amount of 40 ~ 1 / l / 50. Of course the dosage is still show ascendant trend.

In the 1990s, China mold industry into a rapid development period, which enormously promoted the steel production, application of advanced technology. Through the introduction of advanced equipment and techniques, already can produce high quality alloy castings, some of the metallurgical quality has reached the international advanced level, and has a few exports, in the certain reputation. But should see, our steel production, application of the overall level is still low, there are many long-term not solve the problem. Domestic steel are mostly eaf steel, steel composition segregation, dramatically lower level, high level of osteoporosis, carbide, module and performance disparity.

Steel material utilization rate is low, the reason is in the steel rod is occupied 85% above circular saws, forging, instead of big consumption, Module, piangang, plank, high-quality goods, the product variety few less. Steel forging effect change, most change to mould casting forging only for the purpose to shape, size, ignore organizational improvement, so that the mode of the super other carbide and remains of adverse. Mould material and heat treatment is applied in an improper tool. Mould design, material, and manufacturer not familiar with heat, heat treatment technology personnel not familiar with mould conditions, often cause material or heat treatment process and don't match. In addition, heat treatment process and heat treatment equipment and strict execution, improper operation process, deformation and cracking are common. Surveys show that mold for selection and treatment failure caused the early about 70%. Surface treatment in the mold of the application, except cementite, nitriding, enlarge permeability (permeability nonmetal, metal seeping) application, coating and coating processing rarely used less. Some applications and often due to improper selection process, types and reach the expected effect, even not only useless, harmful, become a tool technology weak links.

Domestic steel recent development in the following aspects should focus:

(1) improve the metallurgical quality, increase the variety specification, bad material products, high-quality goods

Advanced equipment and technology, adopting advanced metallurgy method and process, such as secondary refining, electric vacuum, slag remelting multi-way, forging, and rolling, forging, production of fine rolling steel, high grade synthetic diamond To increase production high uniformity, the higher the module, the steel sheet, piangang, etc. Through the machining, quenching and tempering treatment methods provide products of steel products, high-quality goods. Our abundant resources and the alloy labor resources into steel products, improve the international market competition advantage and expanding exports, this is our country steel development of strategic objectives.

(2) development, promotion application new steel

Domestic new steel phyletic, but to develop a new tool of space is very big still, and some new material performance needs to be improved. Such as aluminum alloy castings, large increasingly large aluminum alloy die-casting alloy is developed. As construction in recent years, the research development of high and low prices, wearability ceramic enough tenacity, refractory steel is an urgent problem to be solved.

Since new steel can dramatically improve die longevity, can solve the mould design, manufacture, use and repair of the production and technical problem, can gain great comprehensive benefit should be popularized and applied to new steel, alloy new YingYongLiang increases year by year. Also should pay more attention to the use of material, through the old selection, using new craft, weakness, exert its greater utility.

(3) establish a selection of mould expert system. Timber

The species diversity, mold conditions, the selection of material complicate the more important and urgent. The research work has accumulated extensive data, based on the material properties of supplements, summarized data in mould material technology, the latest achievements and experience, with the increasing popularity of computer technology, the application of modern established a strong and advanced, reliable and practical alloy material selection of expert system is imperative.

(4) establish plastic alloy series

Our plastic industry develops fast, plastic products are widely used in agriculture, machinery, chemical, construction, toy, daily necessities, automobile, lamps and lanterns, household appliances, demand is big, high quality requirements, correspondingly, plastic steel demand for steel increased sharply, the use of performance, process performance also put forward higher request. But the plastic mould material, chapter confusion, optional the gender is big, affect the service life of dies, also influence the plastic products quality and market competitiveness, need through manufacture, introduction, supplements, establish a suitable castings of plastic alloy series, make plastic steel smelting and quality control, supply, materials, processing and using level to a new stage.

(5) strengthen surface treatment technology application

Surface treatment can keep in mind the original composition mould department, on the basis of performance and special performance gives mould surface (mainly the wear resistance, corrosion resistance, etc), and greatly improve the die longevity, broaden the scope of application, still can alloy steel instead of low price of steel, thus high prices have broad application prospect, the world's attention. Our country should strengthen basic theory and application of surface treatment, adopts advanced technology and equipment, so many kinds of high quality, the mold surface treatment in a wide range of applications.