CN106544468A - A kind of production method of low-carbon high-manganese steel - Google Patents

Abstract

The present invention relates to a kind of production method of low-carbon high-manganese steel, using the production process route of converter-RH stoves-LF stoves, is reduced the loss of Mn, reduces LF stoves process time to reduce carburetting by the vacuum of control process process.Advantage is：RH process times are shortened by the tapping of converter low-carbon high-manganese, RH oxygen blast forces decarburization, vacuum degree control to be lost with the gasification for reducing Mn in below 100pa, oxygen blast rifle position 6.5m；It is final to reduce LF stoves process time to reduce carburetting, it is ensured that molten steel disclosure satisfy that finished product component requirements, i.e.,：C≤0.02%, Mn 17%～18%, the steel grade of S≤0.005%.

Description

A kind of production method of low-carbon high-manganese steel

Technical field

The invention belongs to process for making technical field, more particularly to it is a kind of using converter (LD)-vacuum degassing furnace (RH Stove)-ladle refining furnace (LF stoves) technique productions low-carbon high-manganese steel method.

Background technology

Certain low-carbon high-manganese steel finished product composition requires C≤0.02%, Mn 17～18%, S≤0.005% by mass percentage.Mesh Before, it is domestic for such steel grade is typically all to produce in Special Steel Works, precedent is not produced in common steel mill.Patent announcement number CN102827989B is disclosed " a kind of production method of low-carbon high-chromium steel ", and its process route is " converter tapping steel with high carbon-RH - LF ", controls carbon content in 0.15～0.25% tapping by converter smelting, improves the recovery rate of alloy after stove, Jing RH stoves After carbon drop process, in steel, carbon content reaches less than 0.01%, then makes white slag, the alloy of RH oxidations through the modification of LF furnace roofs slag Element reduction is returned, and is achieved that RH stoves production low-carbon high-chromium steel.But for this steel grade, Mn is steamed due to saturation Vapour pressure is relatively low, and in the processing procedure of decarburization is forced in RH oxygen blast in addition to being oxidized a part, some is gasified, During LF tops slag is modified, the Mn lost in RH processing procedures has and can not greatly be reduced, because This, if according to the method described above, LF adds that Mn alloy amounts are excessive, and process time is long to cause a large amount of carburetting, it is impossible to meet The requirement of finished product C≤0.02%.

The content of the invention

To overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of production method of low-carbon high-manganese steel, by converter RH process times are shortened in low-carbon high-manganese tapping, while the vacuum of control process process reduces the gasification loss of Mn, finally Reduce LF stoves process time to reduce carburetting, it is ensured that molten steel disclosure satisfy that finished product component requirements.

For achieving the above object, the present invention is achieved through the following technical solutions：

A kind of production method of low-carbon high-manganese steel, using the production process route of converter-RH stoves-LF stoves, at control The vacuum of reason process reduces LF stoves process time to reduce carburetting, specifically includes following steps reducing the loss of Mn：

1) the high manganese tapping of converter low-carbon and low-sulphur, controls converter tapping C≤0.03%；Mn 17%～18%；S≤0.008%, 1610～1630 DEG C of tapping temperature；

2) decarburization is forced in RH oxygen blast, vacuum degree control in below 100pa, oxygen blast rifle position 6.0-6.5m, out-station temperature 1550～ 1600 DEG C, outbound C≤0.0050%；Mn 13%～15%；S≤0.008%；

3) LF process, add lime 0.45-05kg/t, fluorite 1.0-1.5kg/t, aluminium powder 2.8-3.3kg/t, temperature, manganese, Carbon goes out stand control：1515 DEG C～1525 DEG C of temperature, manganese 17%～18%, C≤0.02%.

Compared with prior art, the invention has the beneficial effects as follows：

RH process times are shortened by the tapping of converter low-carbon high-manganese, decarburization is forced in RH oxygen blast, and vacuum degree control is in 100pa Hereinafter, oxygen blast rifle position 6.5m, is lost with the gasification for reducing Mn；It is final to reduce LF stoves process time to reduce carburetting, protect Card molten steel disclosure satisfy that finished product component requirements, i.e.,：C≤0.02%, Mn 17%～18%, the steel grade of S≤0.005%.

Specific embodiment

Below the present invention is described in detail, it should be noted that the enforcement of the present invention is not limited to following embodiment.

A kind of production method of low-carbon high-manganese steel, using the production process route of converter-RH stoves-LF stoves, shortens at RH The reason time, the loss of Mn is reduced by the vacuum of control process process, reduces LF stoves process time to reduce carburetting, Specifically include following steps：

1) the high manganese tapping of converter low-carbon and low-sulphur, controls converter tapping C≤0.03%；Mn 17%～18%；S≤0.008%, 1610～1630 DEG C of tapping temperature；

2) decarburization is forced in RH oxygen blast, vacuum degree control in below 100pa, oxygen blast rifle position 6.0-6.5m, out-station temperature 1550～ 1600 DEG C, outbound C≤0.0050%；Mn 13%～15%；S≤0.008%；

3) LF process, add lime 0.45-05kg/t, fluorite 1.0-1.5kg/t, aluminium powder 2.8-3.3kg/t, temperature, manganese, Carbon goes out stand control：1515 DEG C～1525 DEG C of temperature, manganese 17%～18%, C≤0.02%.

Embodiment：

By taking 100t converters as an example, comprise the following steps：

1st, converter falls furnace temperature for 1623 DEG C, carbon 0.026% of tapping, and sulphur 0.007% of tapping adds 23t balls by scrap box Shape electrolytic manganese and 2.5t aluminum shots, in front and back after grate 3 times, lower rifle point blows 50s, and oxygen rifle is with respect to rifle position 2m, oxygen flow 18500Nm³/ h, slag-stopping tapping are added without modification agent and alloy, 1588 DEG C of hanging pot temperature, carbon 0.033% in tank, in tank Mn 17.6%, S 0.005% in tank；

2nd, decarburization, oxygen blast rifle position 6.5m, blowing oxygen quantity 300m are forced in RH oxygen blast³, vacuum degree control in below 100pa, break 200kg aluminum shots, 1560 DEG C of out-station temperature, outbound Mn 14.4%, outbound S 0.005% are added after sky；

3rd, 500kg limes, 120kg fluorites, 300kg Al powder stirring 8min are added, sampling, heating add 4t spherical Electrolytic manganese, 1498 DEG C of out-station temperature, outbound C 0.014%, outbound Mn 17.6%, outbound S 0.003%.

The present invention shortens RH process times by the tapping of converter low-carbon high-manganese, and RH oxygen blast forces decarburization, vacuum degree control to exist Below 100pa, oxygen blast rifle position 6.5m are lost with the gasification for reducing Mn；It is final to reduce LF stoves process time to reduce increasing Carbon, it is ensured that molten steel disclosure satisfy that finished product component requirements, i.e.,：C≤0.02%, Mn 17%～18%, the steel of S≤0.005% Kind.

Claims (1)

1. a kind of production method of low-carbon high-manganese steel, using the production process route of converter-RH stoves-LF stoves, its feature It is that the loss of Mn is reduced by the vacuum of control process process, reduces LF stoves process time to reduce carburetting, Specifically include following steps：

1) the high manganese tapping of converter low-carbon and low-sulphur, controls converter tapping C≤0.03%；Mn 17%～18%；S≤0.008%, 1610～1630 DEG C of tapping temperature；

2) decarburization is forced in RH oxygen blast, vacuum degree control in below 100pa, oxygen blast rifle position 6.0-6.5m, out-station temperature 1550～ 1600 DEG C, outbound C≤0.0050%；Mn 13%～15%；S≤0.008%；

3) LF process, add lime 0.45-05kg/t, fluorite 1.0-1.5kg/t, aluminium powder 2.8-3.3kg/t, temperature, manganese, Carbon goes out stand control：1515 DEG C～1525 DEG C of temperature, manganese 17%～18%, C≤0.02%.