Hot work die steel high in comprehensive performance and preparation method of hot work die steel

A high-performance technology for hot work die steel, applied in the field of metallurgy technology, can solve the problems of insufficient high temperature strength and low thermal conductivity of hot work die steel, and achieve high red hardness, high high temperature strength, and good thermal stability

Inactive Publication Date: 2018-04-13
CHONGQING UNIV OF ARTS & SCI
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  • Abstract
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Problems solved by technology

[0005] Aiming at the problems of insufficient high-temperature strength and low thermal conductivity of current hot work die steels, the invention provides a novel high-strength hot work die steel and its preparation method

Method used

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  • Hot work die steel high in comprehensive performance and preparation method of hot work die steel
  • Hot work die steel high in comprehensive performance and preparation method of hot work die steel

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Embodiment Construction

[0029] Taking every 100 tons of steel as an example, the smelting process is as follows:

[0030] 1) Electric arc furnace melting

[0031] Use electric arc furnace to melt metal material and steel scrap and roughly adjust the composition. Add about 2-3% of CaO and about 1% of FeO for slagging, control the basicity between 5-7, carry out dephosphorization, control the steel P≤30ppm in the furnace; add the master alloy additive ( Iron-silicon alloy, ferromanganese alloy, Fe-Cr alloy, Fe-Mo alloy, Fe-V alloy, etc.), tapping temperature 1650-1700°C, C≤0.35% when tapping, adding aluminum with molten steel (per ton of molten steel Add 1Kg), pre-melted slag 200~300kg, leaving steel without slag and tapping;

[0032] 2) Refining in LF furnace: adjust alloy composition and deoxidize through LF refining furnace (vacuum carbon deoxidation, if Al is used for deoxidation, it is easy to cause alumina inclusion), desulfurization, control S≤30ppm; w p H -6 ,w O -6The liquid steel can effe...

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Abstract

The invention discloses hot work die steel high in comprehensive performance and a preparation method of the hot work die steel. The hot work die steel comprises the components of, by weight percentage, 0.25-0.35% of C, 0.6-0.8% of Si, 0.8-1.0% of Mn, 3.75-4.5% of Cr, 1.0-1.65% of Mo, 0.01-0.03% of Y, 0.02-0.05% of Ir, 0.01-0.03% of Sr, 0.2-0.6% of V, less than or equal to 0.03% of P, less than orequal to 0.03% of S and the balance Fe. The preparation method comprises the following steps of (1) smelting, (2) refining, (3) VD vacuum degassing, (4) casting, (5) electroslag remelting, (6) forging, (7) annealing and (8) double refining, thereby obtaining the hot work die steel finally. The hot work die steel has good thermostability and can maintain high rigidity under the condition of 700 DEG C, and the rigidity is above HRC45. The prepared hot work die steel has high high-temperature strength, and has relatively high rigidity, and excellent impact toughness and tempering (thermal fatigue) resistance. The hot work die steel has the advantages of optimization in matching ratio, purity in steel quality, structure uniformity, high strength, high toughness, good tempering resistance andthe like, therefore, the service life of the hot work die steel is prolonged.

Description

technical field [0001] The invention relates to the field of iron and steel smelting and belongs to the metallurgical technology. It is to develop a new type of hot work die steel. Background technique [0002] Hot work die steel is mainly used to make hot forging dies, hot extrusion dies, hot blanking dies, etc. It mainly works under high temperature and high load conditions, and the working conditions are extremely complicated. In order to meet the requirements of hot work dies, hot work die steel It should have high high temperature strength and toughness, good wear resistance, high thermal stability, excellent thermal fatigue resistance, thermal conductivity, etc. Since the mechanical properties of steel mainly depend on the composition and process, traditional hot work die steels include Cr-Mo-V systems such as H13 and H11 or Cr-W-V systems such as 3Cr2W8V. This type of die steel has good comprehensive mechanical properties and has been widely used. However, this typ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/24C22C38/04C22C38/02C22C33/06C21C7/10C21C7/064C21C7/06C22B9/18C21D8/00
CPCC21C7/0056C21C7/06C21C7/064C21C7/10C21D8/005C22B9/18C22C33/06C22C38/002C22C38/005C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 王明光
Owner CHONGQING UNIV OF ARTS & SCI
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