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the development and selection of die steel

Posted by admin on Jun 27th, 2015

Our various kinds of mold steel, low melting point alloy, steel bonded carbide, high temperature alloys and other new mold material has more than 70 species. In GB1299) 85 alloy tool steel national standards, included 33 steel, in JB / T6058) 92 die steel and heat treatment technology conditions, be incorporated into new steel grades 5. Basically formed with Chinese characteristics mold timber system. Standard steel Cr12, Cr12MoV, CrWMn, 9SiCr, 5CrMnMo, 5CrNiMo, 3Cr2W8V and 60Si2Mn etc. are used more often in the mold material, accounting for about 80%. Material 20,45,38CrMoAlA, T7A, T8A, T10A and T12A steel used for the workload is low, less demanding die and mold. W18Cr4V W6Mo5Cr4V2 steel and steel for the work load is heavy, demanding die [13]. In recent years, with the development of the mold industry, China is also some self-developed new die steel including the following:

1. Cold Die Steel.

It includs Flame hardened steel. The wide range of steel quenching temperature (900 ~ 1000e), for the purposes of local flame heating the mold edge, hardness and hardened layer similar to the overall surface layer has a residual compressive stress, the hardened layer have high toughness of the matrix, reducing the edge mouth cracking, chipping and other early failure occurred, improve die life. Matrix steel. It refers to the chemical composition of the steel substrate on the basis of high-speed steel quenching, add small amounts of other elements, appropriate changes in carbon content, so that composition of the steel and high speed steel matrix component of a class of the same or similar tool and die steel. Such a large number of steel due to the removal of excess carbon, therefore, compared with the high-speed steel, toughness and fatigue strength has been greatly improved, but to maintain a high intensity of high speed steel, high hardness, red hardness and good wear. High toughness low-alloy cold work tool steel. The main features of this type of steel is a high strength and toughness, good process performance, a wide range of quenching temperature (870 ~ 930e), may quench oil, air-cooled and air-cooled quenching, quenching small decarbonization sensitivity, heat deformation small, quenching through greater than usual CrWMn, 9SiCr, 9Mn2V low-alloy cold work die steel, and has some wear. High carbon chromium wear-resistant tool steel. To overcome Cr12 type high-carbon high-chromium cold work die steel carbide segregation due to brittle cracking disadvantage, since the 1970s, both at home and abroad have done a lot of research work by reducing the amount of chromium, we developed several new in high-chromium cold work die steel toughness. Chromium content of these steels generally fell 4% to 8%, and appropriate increase of Mo and V content in order to improve the strength and toughness of the steel while maintaining and improving the wear resistance. Representative of the United States vanadium steel alloy developed VascoDie (8Cr8Mo2V2Si), Japan Sanyo Special Steel Company developed QCM-8 (8Cr8Mo2SiV), Daido Steel developed DC53 (Cr8Mo2SiV), our 7Cr7Mo2V2Si (LD steel ) and 9Cr6W3Mo2V (GM steel) steel。

2. Hot work die steel

Commonly used in hot work die steel mainly 5Cr type, 3Cr-3Mo type, Cr-W type and Cr-N-iMo and Cr-Mn-Mo type categories. Representative steel Cr-W type is 3Cr2W8V steel extrusion die and Cu are widely used as heat, Al alloy die-casting mold. This steel high thermal stability, temperature of 650e, but its low thermal conductivity and poor thermal fatigue performance, has gradually have been chromium and chromium molybdenum hot work die steel replaced by the trend.

3. Plastic mold steel

China has not yet formed plastic mold steel series. General plastic mold is often used after the normalized 45 steel or 40Cr steel after quenching and manufacturing. Hardness higher
Plastic mold using CrWMn or Cr12MoV etc. steel. The former low hardness, wear resistance and poor surface finish, tool life is short and gradually replaced by pre-hardened steel; the latter manufacturing complex molds, deformation due to heat treatment, often can not meet the requirements, in recent years the introduction of foreign GE Plastics Mold Meanwhile steel, China has also developed a number of plastic mold steel. It can be divided into pre-hardened steel, age-hardening steel and cold extrusion of plastic mold steel three categories.

posted by Hillary Wang

Huangyan Zhilian Mould & Plastic Co., Ltd.

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