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Smelting and forging method for high-toughness alloy steel forged piece

An alloy steel, high-toughness technology, applied in the direction of improving process efficiency, can solve the problems of easy generation of white spots, affecting the performance of forgings, etc., and achieve the effect of realizing waste utilization, improving the utilization rate of arc heat, and saving raw materials

Active Publication Date: 2019-10-18
浙江精瑞工模具有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem in the prior art that during the cooling process of forgings, due to the joint action of hydrogen in the steel and structural stress, white spots are easily produced and affect the performance of forgings, and a high toughness alloy steel forging is provided. Melting and forging methods, through reasonable melting process, forging method and cooling process, eliminate white spots in forgings, and make forgings have good toughness and fatigue resistance

Method used

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  • Smelting and forging method for high-toughness alloy steel forged piece

Examples

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Comparison scheme
Effect test

Embodiment 1

[0045] (1) Put 28.5t of low-sulfur phosphorus scrap steel (with iron content ≥ 98wt%, C content ≤ 0.2wt%, sulfur and phosphorus content ≤ 0.05wt% respectively) into the electric arc furnace, melt at 1500°C with electricity, add carbon Add carbon with agent to make the carbon content reach 0.8%; add 765kg Mo during the melting period;

[0046] (2) After the furnace charge is melted by 90%, add lime and fluorite to cover the furnace charge according to the consumption of 15kg / t molten steel and 5kg / t molten steel;

[0047] (3) After the charge is fully melted, add a slow-release deoxidizer to the slag for pre-deoxidation according to the amount of 3kg / t molten steel. The preparation method of the slow-release deoxidizer is as follows: breaking and processing polyethylene plastic into polyethylene plastic pellets, and then mixing each group according to the ratio of Al 35wt%, lightly burned magnesium powder 10wt%, bauxite 19wt%, and polyethylene plastic pellets 36wt%. Separately...

Embodiment 2

[0055] (1) Add 28.5t of low-sulfur phosphorus scrap steel (with iron content ≥ 98wt%, C content ≤ 0.2wt%, sulfur and phosphorus content ≤ 0.05wt%) into the electric arc furnace, and melt at 1300°C with electricity, adding carbon Add carbon with agent to make the carbon content reach 0.72%; add 615kg Mo during the melting period;

[0056] (2) After the charge is melted by 80%, add lime and fluorite to cover the charge according to the amount of 12kg / t molten steel and 4kg / t molten steel;

[0057] (3) After the charge is fully melted, add a slow-release deoxidizer to the slag for pre-deoxidation at an amount of 2kg / t molten steel. The preparation method of the slow-release deoxidizer is as follows: breaking and processing polyethylene plastic into polyethylene plastic pellets, and then according to the proportion of Al 32wt%, lightly burned magnesium powder 9wt%, bauxite 20wt%, and polyethylene plastic pellets 39wt%. Separately mixed, hot-pressed into pellets with a particle si...

Embodiment 3

[0065] (1) Add 28.5t of low-sulfur phosphorus scrap steel (with iron content ≥ 98wt%, C content ≤ 0.2wt%, sulfur and phosphorus content ≤ 0.05wt%) into the electric arc furnace, melt at 1400°C with electricity, and add carbon Add carbon with agent to make the carbon content reach 0.8%; add 690kg Mo during the melting period;

[0066] (2) After the charge is melted by 90%, add lime and fluorite to cover the charge according to the amount of 10.4kg / t molten steel and 5.6kg / t molten steel;

[0067] (3) After the charge is fully melted, add a slow-release deoxidizer to the slag for pre-deoxidation according to the amount of 4kg / t molten steel. The preparation method of the slow-release deoxidizer is as follows: breaking and processing polyethylene plastic into polyethylene plastic pellets, and then according to the proportion of Al 36wt%, lightly burned magnesium powder 11wt%, bauxite 17wt%, and polyethylene plastic pellets 36wt%. Separately mix, hot press particle size into pell...

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Abstract

The invention discloses a smelting and forging method for a high-toughness alloy steel forged piece. The smelting and forging method for the high-toughness alloy steel forged piece comprises the following steps: placing waste steel in an electric-arc furnace and smelting, and adding Mo; smelting 80%-90% of a furnace burden, and adding slag for covering; completely smelting the furnace burden intomolten steel and then adding a slow-release deoxidizer; slagging off, forming new slag and then adding Cr, W and Mn into the molten steel, and adding a precipitation deoxidizer; adding a diffusion deoxidizer into the surface of the slag in batches, meanwhile, blowing an inert gas, stirring and refining, and adding V into the molten steel before the refining is concluded; supplementing Si and Co into the molten steel, and continuing to smelt for 10-15min; adding a final deoxidizer and deoxidizing, then entering a vacuum degassing furnace, blowing argon in a vacuum and carrying out degassing treatment, then tapping and pouring, carrying out die release, and then obtaining a steel ingot; feeding the steel ingot into a heating furnace, and obtaining a finished forged piece through three heating numbers; and filling the finished forged piece into an electric furnace and annealing. According to the smelting and forging method for the high-toughness alloy steel forged piece, the generation ofwhite points in the forged piece is avoided, and high mechanical property of the forged piece is achieved through reasonable smelting, forged piece and annealing processes.

Description

technical field [0001] The invention relates to the fields of iron and steel smelting and forging, in particular to a method for melting and forging high-toughness alloy steel forgings. Background technique [0002] Forging is a processing method that uses forging machinery to apply pressure to metal blanks to cause plastic deformation to obtain forgings with certain mechanical properties, certain shapes and sizes. Forging can eliminate defects such as as-cast porosity produced in the metal smelting process and optimize the microstructure. At the same time, due to the preservation of complete metal flow lines, the mechanical properties of forgings are generally better than castings of the same material. [0003] In the prior art, the method of hot forging is generally used to manufacture forgings. For example, a "forging process of low-carbon high-alloy steel" disclosed in Chinese patent documents, its announcement number CN105328095A, includes the following process steps: b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C21C7/10C21D1/26C21D8/00
CPCC21C7/06C21C7/10C21D1/26C21D8/005Y02P10/20
Inventor 卢建东
Owner 浙江精瑞工模具有限公司
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