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Cr3 series hot work die steel and heat treatment method thereof
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A technology of hot work die steel and heat treatment method, which is applied in the alloy field of forging die, can solve the problems of easy cracking, poor thermal strength and wear resistance of 5CrNiMo die steel, and achieve the effect of improving toughness
Inactive Publication Date: 2016-11-09
YINGKOU SPECIAL STEEL FORGING
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[0002] 5CrNiMo and 5CrNiMoV are the main mold materials in the current industry (GB / T11880-89 Die Forging Hammer and Large Mechanical Forging Machine Module Technical Specifications); GB1299-2000 AlloyTool Steel; "my country's Hot Work Die Steel Performance Dataset", Zhu Zongyuan , Mechanical Engineering Materials, Volume 25, Issue 12, P12; Among them, 5CrNiMo die steel has poor thermal strength and wear resistance
But 45Cr2 and 5Cr2 are easy to crack
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Embodiment 1
[0102]The preparation method of Cr3 series hot working die steel is characterized in that it comprises steps: electric furnace smelting, LF furnace refining (LADLE FURNACE, ladle refining furnace), vacuum degassing (VD), mold casting, annealing, electroslag remelting (ESR ), slow cooling, annealing, forging, normalizing, spheroidizing annealing, hydrogen expansion, roughing, inspection, finishing, quenching and tempering, finishing, inspection, and production (to obtain modules or molds). Marked as YD3 die steel.
[0103] By controlling the composition of molten steel, the prepared die steel contains C0.40%, Si0.23%, Mn0.70%, P0.003%, S0.001%, Cr3.23%, Ni1. 41%, Mo 1.84%, V 0.16%, Al 0.020%, Nb 0.03%, and the balance Fe. and inevitable inclusions.
[0104] Figure 8 It is a YD3 die steel specimen, spheroidized annealed after forging, corroded by 4% nitric acidalcohol solution, and the observed structure is AS7 grade.
Embodiment 2
[0106] The method of smelting is with embodiment 1. By controlling the composition of molten steel, the prepared mold steel contains C 0.45%, Si 0.40%, Mn 0.50%, P 0.007%, S 0.002%, Cr 2.80%, Ni 1.60%, Mo2.20 in weight % %, V0.30%, Al 0.060%, Nb 0.10%, the balance of Fe and unavoidable inclusions.
Embodiment 3
[0108] The method of smelting is with embodiment 1. By controlling the composition of molten steel, the prepared mold steel contains C 0.46%, Si 0.40%, Mn 0.70%, P 0.007%, S 0.002%, Cr 3.00%, Ni 1.80%, Mo2.00 in weight % %, V 0.20%, Al 0.080%, Nb 0.15%, the balance of Fe and unavoidable inclusions.
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Abstract
The invention provides a Cr3 series hot work die steel. The hot work die steel comprises, by weight percentage, 0.38%-0.50% of C, 0.15%-0.70% of Si, 0.30%-0.90% of Mn, smaller than or equal to 0.020% of P, smaller than or equal to 0.010% of S, 2.80%-3.50% of Cr, 1.40%-2.00% of Ni, 1.80%-2.60% of Mo, 0.10%-0.50% of V, 0.020%-0.10% of Al, 0.02%-0.20% of Nb and the balance Fe. According to the chemical component formula of the Cr3 series hot work die steel (remembered as YD3 series die steel), compared with existing Cr3Mo3(4Cr3Mo3SiV, H10) series hot work die steel, C, Mn and Cr of the YD3 series die steel are equivalent in content, the content of Mo, V and Si is reduced, the Ni element is added, the Nb element is added, the Al element is added, and therefore toughness is improved.
Description
technical field [0001] The invention belongs to the field of iron-based alloys, and in particular relates to an alloy used for forging dies and its application. Background technique [0002] 5CrNiMo and 5CrNiMoV are the main mold materials in the current industry (GB / T11880-89 Die Forging Hammer and Large Mechanical ForgingMachine Module Technical Specifications); GB1299-2000 AlloyTool Steel; "my country's Hot Work Die Steel Performance Dataset", Zhu Zongyuan , Mechanical Engineering Materials, Volume 25, Issue 12, P12; among them, 5CrNiMo die steel has poor thermal strength and wear resistance. There are few varieties of forging die materials in my country, and the most widely used are 5CrNiMo, 5CrNiMoV, 4Cr2MoVNi (B2) in GB / T11880-89; , low, low, lack of varieties with intermediate hardness, 5Cr2NiMoVSi in GB / T11880-89 is a variety with moderate hardness, but it is not widely used because of its high brittleness and easy cracking. Therefore, it is necessary to develop a ...
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