CN101880839A

CN101880839A - Process for producing wear-resistance high-manganese steel through suspension casting

Info

Publication number: CN101880839A
Application number: CN2010101936398A
Authority: CN
Inventors: 代会中; 代会明
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-06-02
Filing date: 2010-06-02
Publication date: 2010-11-10

Abstract

The invention relates to a process for producing wear-resistance high-manganese steel through suspension casting, which comprises the following steps: adopting a defoaming mold and carrying out negative pressure shaping; carrying out smelting by a medium-frequency induction furnace; preparing raw materials according to a raw material mixture ratio of 52 of waste steel, 8 of manganeisen and 40 of foundry returns; regulating ingredients to obtain the ratio of 1.10 to 1.25 of C, at most 0.8 of Si, 10 to 11 of Mn, at most 0.05 of S, at most 0.08 of P and 0.04 to 0.05 of N; adding the materials according to a material adding sequence of the waste steel, the foundry returns, the manganeisen and nitrogen; raising the temperature and carrying out hardening and tempering: using nitrogen gas for carrying out refining alloying for 20 minutes when the molten steel temperature reaches 1450 DEG C, then, carrying out sampling and heat preservation, raising the temperature to 1500 DEG C after the molten steel is qualified through on-the-spot sample analysis, and pouring deoxidized 0.5 percent pure aluminum into one ton of steel ladles; pumping the inside of a sand box to a degree of 0.04 MP vacuum, carrying out casting when the molten steel temperature is 1460 DEG C; and simultaneously, adding complex alloy suspending agents, wherein the complex alloy suspending agents account for 6.5 percent of the weight of the molten steel and have the granularity of 1mm. The process of the invention has the advantages of energy saving, consumption reduction, exhaust reduction and alloy material saving.

Description

The technology of producing wear-resistance high-manganese steel through suspension casting

Technical field

The present invention relates to the technology of the production technique of high mangaenese steel, particularly a kind of producing wear-resistance high-manganese steel through suspension casting.

Background technology

The production of tradition high mangaenese steel is that a large amount of manganeseiroms and steel scrap are added melting in the electric furnace, pours into a mould with sandbox through modified deoxidation repeatedly again.This production link is not only wasted a large amount of electric energy and manganeseirom, owing to use sodium silicate sand to cause a large amount of solids, gaseous waste contaminate environment, is the production technique of high energy consumption, high flow rate, heavily contaminated, poor benefit simultaneously.

Summary of the invention

The present invention is intended to solve the problems referred to above that existing high mangaenese steel production technique exists, and a kind of technology that adopts the smart casting of disappearance mould, nitrogen alloying, polynary microalloy producing wear-resistance high-manganese steel through suspension casting is provided, that this technology can realize is energy-conservation, consumption reduction, reduce discharging, the purpose of saving alloy material.

The technical scheme that the present invention solves its technical problem employing is:

A kind of technology of producing wear-resistance high-manganese steel through suspension casting, comprising disappears moldedly does, moulding, melting, cast step, it is characterized in that:

A. molded doing disappears: replace traditional copper alloy, aluminium alloy, timber to produce casting die with foam;

B. moulding:, make dry sand fastening with the method for negative pressure with disappearance mould vacuum moulding;

C. melting: i. melting equipment medium-frequency induction furnace; Ii. raw materials by weight meter: steel scrap 52, manganeseirom 8, foundry returns 40; Iii. the composition adjustment by weight percentage: C 1.10-1.25, Si≤0.8, Mn10-11S≤0.05, P≤0.08, N0.04-0.05; Iv. order of addition(of ingredients): steel scrap → foundry returns → manganeseirom → add nitrogen; V. it is modified to heat up: when liquid steel temperature reaches 1450 ℃, carried out refined alloyization about 20 minutes with the nitrogen that removes temperature through decompression by furnace bottom air gap brick, sampling insulation then, molten steel is warming up to 1500 ℃ after on-the-spot sample analysis is qualified, with pouring 1 ton of ladle after 0.5% the fine aluminium deoxidation into;

D. cast: starting vacuum pump will be pumped into the 0.04MP vacuum in the sandbox, liquid steel temperature is 1460 ℃ of cast, add simultaneously and account for molten steel weight 6.5%, granularity at 1 millimeter multicomponent alloy suspension agent, do not stop in the centre, molten steel remains full of in sprue cup, cast finishes the back according to the definite vacuum time that keeps of casting section thickness size, and cleaning and thermal treatment process are carried out according to a conventional method.

Compared with prior art, outstanding effect of the present invention is:

1, by to raw-material control, melts out the high-quality molten steel, with inexhaustible non-metallic material nitrogen instead of part iron alloy.To the molten steel alloying, save alloy material with the form of suspension agent, refinement High Manganese Steel Casting crystal grain improves work-ing life, and alloy adds scaling loss hardly with the suspension agent form.The High Manganese Steel Casting of Zhi Zaoing improves 60% than the High Manganese Steel Casting of traditional method manufacturing work-ing life in this way, and cost reduces by 5%

2, adopt lost foam casting, molten steel is not wasted in concentrated cast, negative pressure of vacuum can improve foundry goods to density, foundry goods does not have shrinkage porosite, shrinkage cavity, product yield improves 20% than sandbox method for casting, molding sand can recycle simultaneously.The binding agent that does not use existing method to use does not produce solid, gaseous waste, without coremaking, has greatly improved production efficiency, has really played beneficial effect energy-conservation, that lower consumption, reduce discharging.

Description of drawings

Fig. 1 is the present invention's mould Suspension Foundry synoptic diagram that disappears.

Fig. 2 is a nitrogen protection refining furnace synoptic diagram of the present invention.

Among the figure: vacuum pump 1, sandbox 2, dry sand 3, foundry goods 4, molten steel 5, suspension agent 6, disappearance mould 7, furnace wall 8, air gap brick 9 fills nitrogen mouth 10.

Embodiment

Below in conjunction with drawings and Examples in detail the present invention is described in detail.

Referring to Fig. 1, Fig. 2, the technology of producing wear-resistance high-manganese steel through suspension casting of the present invention, carry out as follows:

1. model is manufactured: with the disappearance mould 7 of the alternative traditional copper alloy of foam materials, aluminium alloy, timber making foundry goods, the foam materials mould has the advantage that cost is low, production rate is fast, the manufacturing cycle is short.

2. moulding: casting water glass, carbonic acid gas, quartz sand moulding discard tradition.Because 1 ton of steel casting of every production need be with the water glass of 2-3 ton quartz sand and 15-20kg and a large amount of CO ₂Gas uses the back to produce whole solid waste.With disappearance mould 7 negative-pressure molding process, without binding agent, make dry sand 3 fastening with the method for negative pressure, use back usefulness more capable of circulation, do not produce waste, labour intensity reduces simultaneously, and production environment is good.

3. melting: melting equipment adopts medium-frequency induction furnace.

Proportioning raw materials (by weight percentage): steel scrap 52%, manganeseirom 8%, foundry returns 40%.

Adjust composition (by weight percentage): C 1.10-1.25, Si≤0.8, Mn 10-11, S≤0.05, P≤0.08, N0.04-0.05.

Order of addition(of ingredients): steel scrap → foundry returns → manganeseirom → add nitrogen.

It is modified to heat up: when liquid steel temperature reaches 1450 ℃, fill nitrogen mouth 10 and carried out refined alloyization about 20 minutes by 8 bottoms, furnace wall with the nitrogen that removes temperature through decompression through air gap brick 9, sampling insulation then, molten steel is warming up to 1500 ℃ after on-the-spot sample analysis is qualified, with pouring 1 ton of ladle after 0.5% the fine aluminium deoxidation into.

4. cast: starting vacuum pump 1 will be pumped into the 0.04MP vacuum in the sandbox 2, molten steel 5 temperature are 1460 ℃ of cast, add simultaneously and account for molten steel 5 weight 6.5%, granularity at 1 millimeter multicomponent alloy suspension agent 6, can not pause in the centre, molten steel 5 remains full of in sprue cup, and cast finishes the back according to the definite vacuum time that keeps of foundry goods 4 wall thickness size.Cleaning and thermal treatment process are identical with traditional method.

Claims

1. the technology of a producing wear-resistance high-manganese steel through suspension casting, comprising disappears moldedly does, moulding, melting, cast step, it is characterized in that:

C. melting: i. melting equipment medium-frequency induction furnace; Ii. raw materials by weight meter: steel scrap 52, manganeseirom 8, foundry returns 40; Iii. the composition adjustment by weight percentage: C 1.10-1.25, Si≤0.8, Mn10-11, S≤0.05, P≤0.08, N0.04-0.05; Iv. order of addition(of ingredients): steel scrap → foundry returns → manganeseirom → add nitrogen; V. it is modified to heat up: when liquid steel temperature reaches 1450 ℃, carried out refined alloyization about 20 minutes with the nitrogen that removes temperature through decompression by furnace bottom air gap brick, sampling insulation then, molten steel is warming up to 1500 ℃ after on-the-spot sample analysis is qualified, with pouring 1 ton of ladle after 0.5% the fine aluminium deoxidation into;