Compound microalloy hot die steel with high heat resistance and preparation method thereof

A technology of hot work die steel and microalloying, which is applied in the field of die steel manufacturing technology, can solve the problems of low comprehensive performance level of hot work die steel, low quality of domestic alloy die steel, easy cavity collapse or deformation, etc., to achieve High hardness, strong market adaptability, and excellent impact toughness

Inactive Publication Date: 2010-05-19
SHANGHAI UNIV
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AI-Extracted Technical Summary

Problems solved by technology

[0003] The quality of domestic alloy die steel is low, and the comprehensive performance level of hot work die steel is not high
For example, although the thermal strength of 3Cr2W8V steel is high, the toughness is insufficient, and the fracture occurs from time to time when the mold is used....
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Method used

(3) high-temperature homogenization treatment: for the large particle pseudoeutectic carbide of niobium, carry out high-temperature homogenization treatment at 1250 DEG C, the homogenizat...
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Abstract

The invention relates to a compound microalloy hot die steel material with high heat resistance and a preparation method thereof, belonging to the technical field of the manufacture process of die steel. The invention is characterized by comprising the following components by weight percent: 0.25% to 0.4% of C, 1.0% to 1.8% of Si, 0.01% to 0.3% of Mn, 3.5% to 5.0% of Cr, 2.0% to 3.5% of Mo, 0.8% to 1.5% of V, 0.03% to 0.07% of Nb, 0.05% to 0.1% of rare earth element (Ce+La), less than 0.02% of P, less than 0.02% of S and the balance of Fe. The preparation method of the hot die steel comprises the process of: (1) adding rare earth after melting; (2) remelting electroslag; (3) homogenizing at high temperature; (4) forging and dissolving solid; (5) spheroidizing annealing; and (6) heating to finally prepare the hot die steel. The hot die steel has the advantages of high purity, high heat resistance, good heat stability and excellent heat fatigability.

Technology Topic

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  • Compound microalloy hot die steel with high heat resistance and preparation method thereof
  • Compound microalloy hot die steel with high heat resistance and preparation method thereof
  • Compound microalloy hot die steel with high heat resistance and preparation method thereof

Examples

  • Experimental program(1)
  • Effect test(1)

Example Embodiment

[0032] Example 1
[0033] In this embodiment, the composition and weight percentages of hot working die steel are as follows: C 0.32%, Si 1.53%, Mn 0.23%, Cr 4.25%, Mo 2.92%, V 0.99%, Nb 0.06%, rare earth elements ( Ce+La) 0.086, P 0.011%, S<0.016%, Fe balance.
[0034] In this embodiment, the process and steps of hot working die steel are as follows:
[0035] (1) Induction smelting: induction smelting according to the designed alloy element ratio, adding rare earths, and then casting into φ80mm electrode rods;
[0036] (2) Electroslag remelting: Put the smelted and cast electrode rods into the electroslag remelting device for secondary refining; use current to generate resistance heat through the electroslag layer to melt the consumable electrode alloy steel base material, liquid The metal falls in the form of droplets through the slag layer of the slag pool into the water-cooled crystallizer below, and then re-solidifies into a steel ingot of φ160mm about 70Kg;
[0037] (3) High-temperature homogenization treatment: for large-particle pseudo-eutectic carbides of niobium, high-temperature homogenization treatment is carried out at 1250℃, the homogenization time is 6h, and the cooling rate of furnace cooling is less than 100℃/h to achieve Uniform as-cast structure, reduce segregation and eliminate pseudo-eutectic carbide of niobium;
[0038] (4) Forging and solution treatment: forging the above-mentioned steel ingots at a temperature range of 1100 to 900°C to obtain steel forgings, followed by solution treatment;
[0039] (5) Spheroidizing annealing: The test steel adopts two stages of 880℃ and 730℃ for spheroidizing annealing, the total annealing time is 10h. After annealing, the test steel is cooled with the furnace;
[0040] (6) Heat treatment: the above hot work die steel is finally quenched; the quenching temperature is 1060°C; the tempering temperature is 580°C, and the secondary tempering is performed for 2 hours each time.
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PUM

PropertyMeasurementUnit
Room temperature impact toughness288.0J/cm²
Hardness value>= 40.0hrc
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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