Nano bainite hot work die steel and preparation method thereof

A technology for hot work die steel and nano-bainite, which is applied in the field of die steel and achieves the effects of being beneficial to industrialized production, the preparation process is simple and feasible, and the preparation efficiency is high.

Pending Publication Date: 2020-11-06
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few relevant researches and literatures on the preparation of hot work die steel with nano-bainitic structure.

Method used

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  • Nano bainite hot work die steel and preparation method thereof
  • Nano bainite hot work die steel and preparation method thereof
  • Nano bainite hot work die steel and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0033] The invention also provides a preparation method of nano-bainite hot work die steel, which includes the following steps.

[0034] (1) Smelting: Feed materials according to the design requirements of the composition of the steel. The steel includes: C 0.32~0.45, Si 1.20~1.50, Mn 0.20~0.50, Cr 4.75~5.05, Mo 1.10~1.75, V 0.80~1.00, P<0.02, S<0.01, the rest are Fe and unavoidable impurities, then melted in a vacuum induction furnace and cast into ingots. Preferably, the composition of the steel includes: C 0.38, Si 1.50, Mn 0.26, Cr 5.05, Mo1.37, V 1.00, P 0.0082, S 0.0042 in terms of mass percentage, and the rest is Fe and unavoidable impurities.

[0035] (2) Annealing and hot rolling: the steel ingot is annealed, hot rolled, and air cooled to room temperature after hot rolling to obtain a hot rolled slab.

[0036] (3) Quenching and tempering pretreatment: heat the hot-rolled slab in step (2) to 1050~1150°C, keep it warm for 10~15min, cool it to room temperature with oil,...

Embodiment 1

[0040] Embodiment 1, see attached figure 1 , in this example:

[0041] A. According to the mass percentage of C 0.38, Si 1.5, Mn 0.26, Cr 5.05, Mo 1.37, V 1.00, P 0.0082, S0.0042, the ratio of Fe balance, calculate the feeding ratio, and smelt in a vacuum high-frequency induction furnace+ After electroslag remelting, it is poured into a round ingot with a diameter of Φ80mm.

[0042] B. Annealing and hot rolling: heat the steel ingot to 1150°C for 5 hours for uniform annealing, and cool with the furnace. Afterwards, the round ingot is hot-rolled at 1150°C to form a steel plate with a thickness of 25mm; finally, the hot-rolled blanked steel plate is annealed after forging.

[0043] C. Quenching and tempering pretreatment: reheat the hot-rolled slab to 1050° C. in the furnace, keep it warm for 10 minutes, and put it into oil to quench and cool to room temperature after being released from the furnace to obtain a quenched slab. Reheat the quenched slab to 720°C for 1 hour, and ai...

Embodiment 2

[0045] Embodiment 2, see attached figure 2 , in this example:

[0046] A. According to the mass percentage of C 0.38, Si 1.5, Mn 0.26, Cr 5.05, Mo 1.37, V 1.00, P 0.0082, S0.0042, the ratio of Fe balance, calculate the feeding ratio, and smelt in a vacuum high-frequency induction furnace+ After electroslag remelting, it is poured into a round ingot with a diameter of Φ80mm.

[0047] B. Annealing and hot rolling: heat the steel ingot to 1150°C for 5 hours for uniform annealing, and cool with the furnace. Afterwards, the round ingot is hot-rolled at 1150°C to form a steel plate with a thickness of 25mm; finally, the hot-rolled blanked steel plate is annealed after forging.

[0048] C. Quenching and tempering pretreatment: reheat the hot-rolled slab to 1100° C. in the furnace, keep it warm for 10 minutes, put it into oil and quench it to room temperature after coming out of the furnace, and obtain a quenched slab. Reheat the quenched slab to 720°C for 1 hour, and air-cool to ...

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Abstract

The invention discloses nano bainite hot work die steel, and belongs to the technical field of die steel. The nano bainite hot work die steel comprises the following components of, in percentage by mass, 0.32-0.45 of C, 0.80-1.5 of Si, 0.20-0.50 of Mn, 4.75-5.05 of Cr, 1.10-1.75 of Mo, 0.8-1.00 of V, less than 0.02 of P, less than 0.01 of S, the balance Fe and inevitable impurities, and the structure of the hot work die steel is nano bainite. In addition, the invention further discloses a preparation method of the nano bainite hot work die steel. The nano bainite hot work die steel has the beneficial effects that 1, irregular shapes of carbide and distribution of carbide in a forged structure are improved through quenching and tempering pretreatment; 2, the content of Si element is high, precipitation of carbide in the isothermal quenching process is inhibited, and it is ensured that the nano bainite structure is obtained; 3, the unnotched impact energy of a secondary tempering sampleof the nano bainite hot work die steel is not lower than 500 J, the tensile strength is not lower than 1900 MPa, and the hardness is not lower than 52 HRC; and 4, the preparation process flow is simple and practicable, industrial production is facilitated, and the preparation efficiency is high.

Description

technical field [0001] The invention relates to the technical field of die steel, in particular to a nano-bainite hot-working die steel and a preparation method thereof. Background technique [0002] Hot work die steel is the most widely used in the mold industry, among which the mainstream steel grade in hot work die steel is medium carbon chromium H13 steel. Since the introduction of H13 steel in my country, it has quickly occupied the domestic hot work die steel market due to its high thermal strength and other advantages. In recent years, universities, enterprises and scientific research units have improved the composition, smelting and forging technology and heat treatment process of H13 steel, and developed various new types of H13 steel. [0003] The patent document with publication number CN101240400B proposes a low-cost hot work die steel. The final heat treatment adopts the process of quenching and tempering. The hardness after tempering at 600°C does not exceed 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C21D1/20C21D1/25C21D1/26C21D6/00C21D8/02C21D9/00C22C33/04
CPCC21D1/20C21D1/25C21D1/26C21D6/002C21D6/005C21D6/008C21D8/0263C21D9/0081C21D2211/001C21D2211/002C22C33/04C22C38/002C22C38/02C22C38/04C22C38/22C22C38/24
Inventor 王天生孙晓文王岳峰史新琦
Owner YANSHAN UNIV
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