CN105648301A

CN105648301A - 42CrMo melting process

Info

Publication number: CN105648301A
Application number: CN201410644439.8A
Authority: CN
Inventors: 吴家超
Original assignee: Chongqing Chungu Machinery Manufacturing Co Ltd
Current assignee: Chongqing Chungu Machinery Manufacturing Co Ltd
Priority date: 2014-11-14
Filing date: 2014-11-14
Publication date: 2016-06-08

Abstract

The invention discloses a 42CrMo melting process. The 42CrMo melting process is characterized in that the process includes the following steps that (1) material adding is conducted; (2) slag making is carried out; (3) sampling and slagging-off are conducted; (4) deoxidation is performed; (5) the temperature is measured; (6) silicon iron is added; (7) steel tapping is conducted, specifically, the temperature of molten steel meets the requirement, then powering off for steel tapping is performed, 0.4 kg of rare earth is added into a teapot ladle for inoculation, 0.5 Kg of aluminum wires (0.8 Kg/t) are inserted for final deoxidation, finally a covering agent is added so as to prevent the molten steel from being oxidized, and finished product analysis is performed; and (8) pouring is performed, specifically, pouring is performed after the molten steel is kept still in the ladle for three to five minutes, and the required pouring temperature is 1530 to 1550 DEG C. The 42CrMo melting process is simple in method, many repeated steps are omitted, and the working efficiency is improved.

Description

A kind of 42CrMo smelting technology

Technical field

The present invention relates to a kind of 42CrMo smelting technology.

Background technology

42CrMo steel belongs to unimach, has high strength and toughness, and quenching degree is also better, without obvious temper brittleness, has higher fatigue limit and anti-repeatedly impact capacity after modifier treatment, and low-temperature impact toughness is good. The suitable manufacture of this steel requires the large and medium-sized mould of plastics of some strength and toughness. But 42CrMo in melting, comparison of processes complexity, smelting efficiency is not high.

Summary of the invention

Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide a kind of 42CrMo smelting technology, and this smelting process is simple, and the method technique is simple, has removed a lot of repeated operations from, has improved operating efficiency.

For achieving the above object, the invention provides a kind of 42CrMo smelting technology, it is characterized in that, comprise the steps 1) reinforced: after adding steel scrap, molybdenum-iron, energising is melted, and in 6-8 minute that starts energising, supplies with 60% power, after rush of current stops, gradually power is opened to maximum, noted at any time smashing material, prevent furnace charge " bridging " and continue to add furnace charge.

2) slag making: furnace charge adds slag making materials after melting clearly, lime 5Kg, fluorite 2.5Kg, slag making covers molten steel, the 1-1.5% that slag charge addition is inventory.

3) sampling is skimmed: after furnace charge melts clearly, and sample analysis C, S, P, Mo, Si, Mn, P, and the ferrochrome of preheating and slag making materials are added in stove, slag charge drops to 40-50% by power after melting clearly, and turndown is skimmed, and separately makes new slag.

4) deoxidation: after slag chargeization is clear, add lime 0.3Kg, aluminum steel 0.6Kg carries out diffusive deoxidation, in deoxidation process, available pulverized limestone and Fluorspar Powder are adjusted slag viscosity, in the time that molten steel temperature reaches more than 1560 DEG C, remove most of slag simultaneously, add ferromanganese and slag making materials.

5) thermometric: measure molten steel temperature, require tapping temperature at 1610-1630 DEG C, check deoxygenation of liquid steel situation.

6) add ferrosilicon: within before coming out of the stove 5-10 minute, add ferrosilicon, addition in accordance with regulations lower limit is allocated into, and adjust chemical composition according to sample, each element is adjusted after balance, slag making is warming up to 1550 DEG C of slagging-off, on the substantially good clean liquid level of deoxidation, add FeTi30, Ti forms TiN in molten steel, TiC, TiC particle is tiny, it is the effective particle that hinders Austenite Grain Growth, improve the cleanliness factor of molten steel, obtain N, O, the purifying of steel that S content is less, can obtain fine grain structure, ferrotianium adds rear timely intensification, in the time that molten steel temperature rises to 1600 DEG C, skim and descum, on the good clean liquid level of deoxidation, add the ferro-boron of preheating, and adopt effectively insulating heat preserving agent to cover, in the time that molten steel temperature rises to 1630 DEG C ~ 1650 DEG C, thoroughly slagging-off hypsokinesis steel, 7) tapping: molten steel temperature meets the requirements, the tapping that has a power failure adds rare earth 0.4kg to carry out inoculation in teapot bag, inserts aluminum steel (0.8Kg/t) 0.5Kg and carries out final deoxidizing, finally adds coverture, prevents molten steel oxidation, and does check analysis,

8) cast: molten steel is poured into a mould after calm 3-5 minute in bag, and requiring pouring temperature is 1530-

1550℃。

The invention has the beneficial effects as follows: the present invention has improved smelting efficiency, yield rate, reduce production costs, obtain the unforeseeable technique effect of those skilled in the art, overcome design set for a long time, a kind of new design and processing thought are provided, and have obtained than the better Smelting Effect of prior art.

Detailed description of the invention

Technical scheme disclosed by the invention is a kind of 42CrMo smelting technology, it is characterized in that, comprise the steps, 1) reinforced: after adding steel scrap, molybdenum-iron, energising is melted, in 6-8 minute that starts energising, supply with 60% power, after rush of current stops, gradually power being opened to maximum, note at any time smashing material, prevent furnace charge " bridging " and continue to add furnace charge.

1550℃。

The present invention has improved smelting efficiency, yield rate, reduce production costs, obtained the unforeseeable technique effect of those skilled in the art, overcome design set for a long time, a kind of new design and processing thought are provided, and have obtained than the better Smelting Effect of prior art.

More than describe preferred embodiment of the present invention in detail. Should be appreciated that those of ordinary skill in the art just can design according to the present invention make many modifications and variations without creative work. Therefore, all technical staff in the art, all should be in by the determined protection domain of claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims

1. a 42CrMo smelting technology, it is characterized in that, comprise the steps, 1) reinforced: after adding steel scrap, molybdenum-iron, energising is melted, in 6-8 minute that starts energising, supply with 60% power, after rush of current stops, gradually power being opened to maximum, note at any time smashing material, prevent furnace charge " bridging " and continue to add furnace charge;

2) slag making: furnace charge adds slag making materials after melting clearly, lime 5Kg, fluorite 2.5Kg, slag making covers molten steel, the 1-1.5% that slag charge addition is inventory;

3) sampling is skimmed: after furnace charge melts clearly, and sample analysis C, S, P, Mo, Si, Mn, P, and the ferrochrome of preheating and slag making materials are added in stove, slag charge drops to 40-50% by power after melting clearly, and turndown is skimmed, and separately makes new slag;

4) deoxidation: after slag chargeization is clear, add lime 0.3Kg, aluminum steel 0.6Kg carries out diffusive deoxidation, in deoxidation process, available pulverized limestone and Fluorspar Powder are adjusted slag viscosity, in the time that molten steel temperature reaches more than 1560 DEG C, remove most of slag simultaneously, add ferromanganese and slag making materials;

5) thermometric: measure molten steel temperature, require tapping temperature at 1610-1630 DEG C, check deoxygenation of liquid steel situation;

6) add ferrosilicon: within before coming out of the stove 5-10 minute, add ferrosilicon, addition in accordance with regulations lower limit is allocated into, and adjust chemical composition according to sample, each element is adjusted after balance, slag making is warming up to 1550 DEG C of slagging-off, on the substantially good clean liquid level of deoxidation, add FeTi30, Ti forms TiN in molten steel, TiC, TiC particle is tiny, it is the effective particle that hinders Austenite Grain Growth, improve the cleanliness factor of molten steel, obtain N, O, the purifying of steel that S content is less, can obtain fine grain structure, ferrotianium adds rear timely intensification, in the time that molten steel temperature rises to 1600 DEG C, skim and descum, on the good clean liquid level of deoxidation, add the ferro-boron of preheating, and adopt effectively insulating heat preserving agent to cover, in the time that molten steel temperature rises to 1630 DEG C ~ 1650 DEG C, thoroughly slagging-off hypsokinesis steel,

7) tapping: molten steel temperature meets the requirements, the tapping that has a power failure adds rare earth 0.4kg in teapot bag

Carry out inoculation, insert aluminum steel (0.8Kg/t) 0.5Kg and carry out final deoxidizing, finally add coverture, prevent molten steel oxidation, and do check analysis;

1550℃。