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B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof

A hot work die steel, high strength and toughness technology, applied in the field of metallurgical technology, can solve the problems of poor cold and heat fatigue performance, die failure and scrap, poor impact toughness, etc., achieve good tempering resistance, improve comprehensive performance, and optimize the ratio. Effect

Active Publication Date: 2012-01-11
SHANDONG YUANDA MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-strength, toughness and tempering-resistant 4Cr3MoWVNi (B3R) hot work die steel and its preparation method to solve the problem that the temperature of the product in the prior art is limited below 630°C, the manufacturing cost is high, and the tempering resistance (thermal fatigue) Poor performance; poor cold and heat fatigue performance, poor impact toughness, resulting in cracking and cracking of the mold, which leads to early failure and scrapping of the mold

Method used

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  • B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof
  • B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof
  • B3R hot work die steel with high strength and toughness and resistance to tempering, and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]In this example, the present invention is used to make 500×500×230 high-strength toughness and tempering-resistant 4Cr3MoWVNi (B3R) hot work die steel. The chemical composition ratio used is C: 0355%; Si: 0.17%; Mn: 0.32%; Cr : 2.55%; Mo: 1.11%; W: 0.55%; V: 0.55%; Ni: 1.55%; S: 0.005%; P: 0.009%; Fe: balance.

[0038] The specific method steps of the present embodiment are as follows:

[0039] (1) Intermediate frequency smelting:

[0040] Proportionate 550kg of ingredients according to the above chemical composition formula, put them into the medium frequency induction furnace, and dry the basic furnace lining at 500°C for 3 hours before putting into the furnace. The temperature is 1550°C;

[0041] (2) Electroslag remelting (refining): Electroslag remelting is performed on the above-mentioned electrode ingots, and the process parameters are as follows:

[0042] a. Four-element slag system ratio: alumina 32%; calcium oxide 15%; calcium fluoride 46%; silicon oxide 7%; ...

Embodiment 2

[0061] This embodiment uses the present invention to make 300×300×150 high-strength toughness and tempering-resistant 4Cr3MoWVNi (B3R) hot work die steel. The chemical composition ratio used is C: 0.39%; Si: 0.25%; Mn: 0.41%; Cr : 3.05%; Mo: 1.25%; W: 0.65%; V: 0.66%; Ni: 1.65%; S: 0.007%; P: 0.012%;

[0062] The specific method steps of the present embodiment are as follows:

[0063] (1) Intermediate frequency smelting:

[0064] Proportionate 200kg of ingredients according to the above chemical composition formula, put them into the medium frequency induction furnace, and dry the basic furnace lining at 500°C for 3 hours before putting into the furnace. The temperature is 1570°C;

[0065] (2) Electroslag remelting (refining):

[0066] The above-mentioned electrode ingot is subjected to electroslag remelting, and its process parameters are as follows:

[0067] a. The proportion of four-element slag system: alumina 33%; calcium oxide 16%; calcium fluoride 46%; silicon oxide...

Embodiment 3

[0086] This embodiment uses the present invention to make 400×400×200 high-strength toughness and tempering-resistant 4Cr3MoWVNi (B3R) hot work die steel. The chemical composition ratio used is C: 0.415%; Si: 0.335%; Mn: 0.49%; Cr : 3.35%; Mo: 1.45%; W: 0.75%; V: 0.77%; Ni: 1.80%; S: 0.009%; P: 0.016%;

[0087] The specific method steps of the present embodiment are as follows:

[0088] (1) Intermediate frequency smelting:

[0089] Proportionate 350kg of ingredients according to the above chemical composition formula, put them into the medium frequency induction furnace, and dry the basic furnace lining at 500°C for 3 hours before putting into the furnace. The temperature is 1580°C;

[0090] (2) Electroslag remelting (refining): Electroslag remelting is performed on the above-mentioned electrode ingots, and the process parameters are as follows:

[0091] a. The proportion of four-element slag system: alumina 34%; calcium oxide 17%; calcium fluoride 47%; silicon oxide 2%;

...

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Abstract

The invention provides 4Cr3MoWVNi (B3R) hot work die steel with high strength and toughness and resistance to tempering, and a preparation process thereof. Raw materials for preparing the B3R hot work die steel comprise, by weight, C 0.35 to 0.42%, Si 0.15 to 0.35%, Mn 0.3 to 0.5%, Cr 2.50 to 3.50%, Mo 1.00 to 1.50%, W 0.50 to 0.80%, V 0.50 to 0.80%, Ni 1.45 to 1.85%, S 0.003 to 0.010% and P 0.008 to 0.018%, with the balance being Fe. The preparation process comprises the following steps: smelting at intermediate frequency--remelting (refining) of electroslag-diffusion hydrogen of electroslagingots, annealing treatment of electroslag ingots--forging--annealing of forging stocks--rough machining--vacuum heat treatment, and secondary tempering so as to obtain the novel product of die steel. The hot work die steel prepared in the invention has high Rockwell hardness, excellent impact toughness and tempering (thermal fatigue) resistance, and the advantages of optimized collocation of components, pure steel quality, a uniform structure, high strength, strong toughness, good tempering resistance, etc.

Description

technical field [0001] The invention belongs to the technical field of metallurgy technology, and relates to a novel hot working mold material. Background technique [0002] Hot working dies are divided into several main types: hammer forging, die forging, extrusion and die-casting, including hot forging dies, press forging dies, stamping dies, hot extrusion dies and metal die-casting dies. The working conditions of hot work molds are quite complicated and harsh. In addition to bearing huge mechanical stress during work, they must also bear thermal stress caused by repeated heating and cooling. Therefore, due to the determination of its working environment and its mission, higher requirements are put forward for the material of hot work dies, that is, hot work die steel: in addition to high hardness, strength, wear resistance and toughness, hot work die steel , It should also have good high temperature strength, thermal fatigue stability, thermal conductivity and corrosion ...

Claims

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Application Information

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IPC IPC(8): C22C38/46C22B9/18C21D1/773
Inventor 曹衍学王波
Owner SHANDONG YUANDA MATERIAL TECH CO LTD
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