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Forging method for 55NiCrMoV7 die steel

A technology of die steel and forging method, which is applied in the forging field of 55NiCrMoV7 die steel, can solve the problems of low economic benefit, low flaw detection pass rate, inclusions, etc., and achieve significant economic benefits

Inactive Publication Date: 2015-06-24
JIANGSU LINGFEI FORGING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although vanadium has a strong precipitation strengthening effect, the processing performance is obviously deteriorated due to the excessive content. Moreover, due to the addition of V element, a series of porosity, shrinkage cavity, inclusion, Metallurgical defects such as segregation
[0003] Due to the original internal metallurgical defects and module size characteristics of the 55NiCrMoV7 steel ingot, this module adopts the traditional forging method to forge this steel module, and its internal defects such as looseness, shrinkage cavity, segregation, and inclusions have been greatly improved and eliminated. The pass rate of flaw detection is still not high, and the economic benefit is low

Method used

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  • Forging method for 55NiCrMoV7 die steel
  • Forging method for 55NiCrMoV7 die steel
  • Forging method for 55NiCrMoV7 die steel

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] A concrete forging method of the present invention is as follows:

[0024] a) 55NiCrMoV7 die steel, select the raw material of steel ingots smelted by electric furnace + ladle vacuum refining + vacuum casting, the range of chemical composition (weight percentage) is: 0.5≤C≤0.6, 1.0≤Cr≤1.2, 0.45≤Mo≤0.55 , 1.5≤Ni≤1.8, 0.07≤V≤00.1, 0.1≤Si≤0.4, 0.65≤Mn≤0.95, P≤0.02, S≤0.02.

[0025] b) Send the steel ingot to the hot furnace, heat it to 1240±10°C, and keep it for more than 12 hours; if the steel ingot is sent to the hot furnace (the highest charging temperature is less than 400°C), the heating curve is as follows figure 1 shown. If the hot ingot is sent to the hot furnace, the heating curve is as follows figure 2 shown.

[0026] c) The first fire, take out the steel ingot in the furnace, use the upper and lower flat anvils to press the clamp handle on the riser...

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Abstract

The invention relates to a forging method for 55NiCrMoV7 die steel. The forging method for the die block includes the steps that materials are detected and heated; according to a first fire, a blank is made in a pre-forging mode through a WHF method; according to a second fire, drawing is performed through an FM forging method; according to a third fire, the fiber direction is changed for forging forming; after the die block is forged, a hot charging furnace is adopted for heat treatment of recrystallization and normalized tempering. The novel forging technology for the 55NiCrMoV7 large die block is adopted and has the advantages that the flaw detection qualified rate of the die block is increased, all properties of the die block are improved, the quality of the forged part is improved, and remarkable economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of forging, in particular to a forging method of 55NiCrMoV7 die steel. Background technique [0002] 55NiCrMoV7 is an alloy tool steel imported from Europe imported from my country, and it is a French standard (NFA35-590-1992) steel grade. Double vacuum smelting of steel ingots (electric furnace + ladle vacuum refining + vacuum casting). Compared with the original 5CrNiMo die steel widely used in my country, this die steel has better wear resistance, hardenability, hot hardness, toughness, dimensional stability and thermal fatigue resistance, and has a wider range of use and more Long service life. Because of its much added vanadium (hereinafter referred to as V), vanadium is an excellent deoxidizer for steel. The addition of vanadium in steel can refine the structure and grains and improve the strength and toughness. Vanadium is a strong carbide forming element. It has a strong bond with carbon and fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/00C22C38/46C21D8/00
Inventor 殷勇锋钱飞杨晓明
Owner JIANGSU LINGFEI FORGING