CN103203663A - Grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet - Google Patents
Grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet Download PDFInfo
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- CN103203663A CN103203663A CN2013101249229A CN201310124922A CN103203663A CN 103203663 A CN103203663 A CN 103203663A CN 2013101249229 A CN2013101249229 A CN 2013101249229A CN 201310124922 A CN201310124922 A CN 201310124922A CN 103203663 A CN103203663 A CN 103203663A
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- grinding
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- emery wheel
- continuous casting
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Abstract
The invention relates to a grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet. The grinding method includes: firstly grinding with a 16# grinding wheel and secondly grinding with a 20# grinding wheel; parameters adopted by the first step are arranged as follow: I equipment is casting surface grinding machine, II grinding wheel angle is 45 degrees +/- 5 degrees, III lathe speed is 50 +/- 3 m/min, IV feed rate is 30 mm +/- 5 mm, V grinding head pressure ratio is enhanced 160-180, VI one grinding mode is when grinding rate of two surfaces >/= 2.5% and </= 3.0%, each surface is grinded enhancedly for 3 times, when grinding rate of two surfaces >/= 3.5%, each surface is grinded enhancedly for 4 times, VII roughness after grinding RZ </= 120 mum; and parameters adopted by the second step are arranged as follow: I equipment is casting surface grinding machine, II grinding wheel angle is 45 degrees +/- 5 degrees, III lathe speed is 50 +/- 3 m/min, IV feed rate is 25 mm +/- 5 mm, V grinding head pressure ratio is enhanced 60-70, VI grinding slightly for 2 times based on the first step, VII roughness after grinding RZ </= 60 mum. The surface toughness is low with the grinding method.
Description
Technical field
The present invention relates to the grinding method of slab in a kind of two-phase and the heat-resistance stainless steel continuous casting.
Background technology
The stainless steel casting blank reconditioning is to rely on the running of driven by motor grinding wheel that continuous casting billet surface protection slag crust and blemish are peeled off by sharpening machine, is to guarantee that continuous casting billet rolls into the necessary means of qualified corrosion resistant plate.
Two-phase, heat-resistance stainless steel are as applicant's emphasis variety steel, along with continually developing of market, volume of production and marketing increases year by year, particularly in recent years since applicant's two-phase, heat resisting steel output had significantly and improved, because the plate strand all is rolled through being passed to down operation after the reconditioning in all two-phases, the heat resisting steel, the surperficial polishing scratch that causes because of reconditioning needs through repeatedly eliminating after ball blast, albefaction, the grinding, have a strong impact on the hot-rolled process production capacity, because super dark grinding causes unplanned product, both influence the contract encashment ratio, caused economic loss because of mark-down sale again.Slab reconditioning surface quality roughness is to embody the key index that rolls plate surface quality in the back in two-phase, the heat-resistance stainless steel continuous casting, if reconditioning roughness height, not only be easy to generate polishing scratch after rolling, can produce also simultaneously that to roll the rear surface coarse, plate rolls the rear surface quality in having a strong impact on.
Summary of the invention
In order to overcome the above-mentioned deficiency of the grinding method of slab in existing two-phase and the heat-resistance stainless steel continuous casting, the invention provides a kind of improve slab reconditioning surface quality in two-phase, the heat-resisting continuous casting and roll the two-phase of plate surface quality in the back and the heat-resistance stainless steel continuous casting in the grinding method of slab.
For a long time, the problem that two-phase, heat-resisting middle plate reconditioning base surface roughness are plate surface quality in the puzzlement always, because the particularity of this type of steel grade, defectives such as casting billet surface is mingled with, pore are darker, for high efficiency is ground clean defective, routine uses granularity to carry out reconditioning as the 16# emery wheel, but reconditioning rear surface roughness average out to 120 μ m, can not guarantee to roll plate surface quality in the back, it is serious that the surface manifests polishing scratch.
Earlier use granularity to be the reconditioning of 16# emery wheel to this, high efficiency is removed the casting billet surface defective, re-uses granularity and carries out reconditioning for the 20# emery wheel, eliminates the polishing scratch that produces because of 16# emery wheel reconditioning process, and roughness control is at R after the reconditioning
Z≤ 60 μ m, thus casting billet surface roughness after the reconditioning effectively guaranteed.
The grinding method of slab comprises following sequential steps and requirement in this two-phase and the heat-resistance stainless steel continuous casting:
One, first step granularity is the reconditioning of 16# emery wheel
1, use equipment: casting billet surface sharpening machine.
2, reconditioning emery wheel angle: 45 ° ± 5 °
3, chassis speed: 50m ± 3/min
4, the amount of feeding: 30mm ± 5mm
5, bistrique is depressed ratio value: increase the weight of reconditioning 160-180
6, a kind of mode wherein below two face reconditionings are taked:
Two face reconditioning rates: 〉=2.5% ,≤3.0% o'clock, { weight before reconditioning rate=(weight before the strand mill-mill back weight) ÷ mill }, single face respectively adds refaces 3 times;
Two face reconditioning rates: 〉=3.5%, single face respectively adds refaces 4 times.
7, ground the surface roughness R of two reconditioning faces of back strand
Z≤ 120 μ m.
Two, second step was the reconditioning of 20# emery wheel with granularity
1, use equipment: casting billet surface sharpening machine.
2, reconditioning emery wheel angle: 45 ° ± 5 °
3, chassis speed: 50m ± 3m/min
4, the amount of feeding: 25mm ± 5mm
5, bistrique is depressed ratio value: light pruning mill 60-70
6, two faces increase the weight of on the basis of reconditioning each light mill 2 times again at 16# emery wheel single face.
7, grind the rear surface roughness and reached R
Z≤ 60 μ m.
Beneficial effect of the present invention
The surface roughness of having ground the back strand with the grinding method of slab in the continuous casting of the present invention reaches R
Z≤ 60 μ m.Avoid repeatedly ball blast, albefaction, the grinding step of casting billet surface, effectively guaranteed to roll plate surface quality in the back.Be 760 tons enterprise for plate continuous casting base output in the monthly two-phase that relates to this grinding method, the heat resisting steel, amount to and to eliminate 1331.52 tons of middle plate amounts that produce polishing scratch the whole year; Can reduce because of 620.16 tons of plates in the unplanned product of polishing scratch generation.Polishing scratch needs could eliminate after secondary ball blast, albefaction, grinding, costs with 350 yuan/ton, 1100 yuan of unplanned product ton steel price reduction.
Ten thousand yuan of annual saving the: 1331.52 * 350+620.16 * 1100=114.82.
The specific embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Embodiment one
The continuous casting billet of the two-phase steel grade S31803 of present embodiment reconditioning, the length of strand is 2000 millimeters, and is wide 1238 millimeters, thick 160 millimeters.
One, first step granularity is the reconditioning of 16# emery wheel
1, use equipment: casting billet surface sharpening machine.
2, reconditioning emery wheel angle: 45 °;
3, chassis speed: 50m/min;
4, the amount of feeding: 30mm;
5, bistrique is depressed ratio value: increase the weight of reconditioning 173
6, two face reconditioning rates: 〉=2.5%, { weight before reconditioning rate=(weight before the strand mill-mill back weight) ÷ mill }, single face respectively adds refaces 3 times
7, ground the surface roughness R on strand two sides, back
Z108 μ m.
Two, second step was the reconditioning of 20# emery wheel with granularity
1, use equipment: casting billet surface sharpening machine.
2, reconditioning emery wheel angle: 45 °;
3, chassis speed: 50m/min;
4, the amount of feeding: 25mm;
5, bistrique is depressed ratio value: light pruning mill 66;
6, two faces increase the weight of on the basis of reconditioning each light mill 2 times again at 16# emery wheel single face.
7, grind the rear surface roughness and reached R
Z56 μ m.
Embodiment two
The continuous casting billet of the heat-resisting steel grade S30815 of present embodiment reconditioning, the length of strand are 2000 millimeters, and be wide 1238 millimeters, thick 160 millimeters.
One, first step granularity is the reconditioning of 16# emery wheel
1, use equipment: casting billet surface sharpening machine.
2, reconditioning emery wheel angle: 45 °;
3, chassis speed: 50m/min;
4, the amount of feeding: 30mm;
5, bistrique is depressed ratio value: increase the weight of reconditioning 167
6, two face reconditioning rates: 〉=3.5%, { weight before reconditioning rate=(weight before the strand mill-mill back weight) ÷ mill }, single face respectively adds refaces 4 times
7, ground the surface roughness R on strand two sides, back
Z103 μ m.
Two, second step was the reconditioning of 20# emery wheel with granularity
1, use equipment: casting billet surface sharpening machine.
2, reconditioning emery wheel angle: 45 °;
3, chassis speed: 50m/min;
4, the amount of feeding: 25mm;
5, bistrique is depressed ratio value: light pruning mill 63
6, two faces increase the weight of on the basis of reconditioning each light mill 2 times again at 16# emery wheel single face.
7, ground the surface roughness R on strand two sides, back
Z52 μ m.
The procedure parameter of above-mentioned two embodiment sees Table 1
Table 1
Annotate: it is by being presented at a reading on the operation screen after the multifactor comprehensive conversions such as electric current, pressure, rotating speed, not having unit that bistrique is depressed ratio value.
Claims (1)
1. the grinding method of slab in a two-phase and the heat-resistance stainless steel continuous casting, it comprises following sequential steps:
One first step granularity is the reconditioning of 16# emery wheel
IUse equipment: casting billet surface sharpening machine;
IIReconditioning emery wheel angle: 45 ° ± 5 °;
IIIChassis speed: 50m ± 3/min;
IVThe amount of feeding: 30mm ± 5mm;
VBistrique is depressed ratio value: increase the weight of reconditioning 160-180;
VIA kind of mode wherein below two face reconditionings are taked:
Two face reconditioning rates: 〉=2.5% ,≤3.0% o'clock, single face respectively adds refaced 3 times;
Two face reconditioning rates: 〉=3.5%, single face respectively adds refaces 4 times;
VIIGround the surface roughness R of two reconditioning faces of back strand
Z≤ 120 μ m;
2 second steps were the reconditioning of 20# emery wheel with granularity
IUse equipment: casting billet surface sharpening machine;
IIReconditioning emery wheel angle: 45 ° ± 5 °;
IIIChassis speed: 50m ± 3m/min;
IVThe amount of feeding: 25mm ± 5mm;
VBistrique is depressed ratio value: light pruning mill 60-70;
VITwo faces increase the weight of on the basis of reconditioning each light mill 2 times again at 16# emery wheel single face;
VIIGrind the rear surface roughness and reached R
Z≤ 60 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101249229A CN103203663A (en) | 2013-04-12 | 2013-04-12 | Grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet |
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| CN2013101249229A CN103203663A (en) | 2013-04-12 | 2013-04-12 | Grinding method for double-phase heat-resistant stainless steel continuous casting sheet billet |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103465133A (en) * | 2013-09-30 | 2013-12-25 | 山西太钢不锈钢股份有限公司 | Polishing method for stainless steel continuous casting rolled slab 00 section |
| CN103521730A (en) * | 2013-10-14 | 2014-01-22 | 山西太钢不锈钢股份有限公司 | Method of multi-furnace continuous casting of ferritic stainless steel rectangular blanks |
| CN104625890A (en) * | 2015-02-06 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Grinding method of austenitic stainless steel continuous casting billet containing Mo |
| CN106002568A (en) * | 2016-05-25 | 2016-10-12 | 振石集团东方特钢有限公司 | Stainless steel slab head slab grinding technology |
| CN107866700A (en) * | 2017-10-23 | 2018-04-03 | 南京钢铁股份有限公司 | A kind of control method of blank grinding depth |
| CN108453140A (en) * | 2017-02-21 | 2018-08-28 | 本钢板材股份有限公司 | Wide version base erects the method that strips off the skin after pouring the first cross of time head base |
| CN111993216A (en) * | 2020-07-02 | 2020-11-27 | 山西太钢不锈钢股份有限公司 | Method for manufacturing duplex stainless steel hot-rolled middle plate with surface roughness Ra less than or equal to 5 mu m |
| CN113084132A (en) * | 2021-04-02 | 2021-07-09 | 山西太钢不锈钢股份有限公司 | Production method for reducing surface defects of ferritic stainless steel plate |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103465133A (en) * | 2013-09-30 | 2013-12-25 | 山西太钢不锈钢股份有限公司 | Polishing method for stainless steel continuous casting rolled slab 00 section |
| CN103521730A (en) * | 2013-10-14 | 2014-01-22 | 山西太钢不锈钢股份有限公司 | Method of multi-furnace continuous casting of ferritic stainless steel rectangular blanks |
| CN103521730B (en) * | 2013-10-14 | 2015-11-25 | 山西太钢不锈钢股份有限公司 | A kind of method of ferritic stainless steel rectangular bloom many stoves continuous casting |
| CN104625890A (en) * | 2015-02-06 | 2015-05-20 | 山西太钢不锈钢股份有限公司 | Grinding method of austenitic stainless steel continuous casting billet containing Mo |
| CN106002568A (en) * | 2016-05-25 | 2016-10-12 | 振石集团东方特钢有限公司 | Stainless steel slab head slab grinding technology |
| CN106002568B (en) * | 2016-05-25 | 2018-05-08 | 振石集团东方特钢有限公司 | A kind of stainless steel slab head base thinning technique |
| CN108453140A (en) * | 2017-02-21 | 2018-08-28 | 本钢板材股份有限公司 | Wide version base erects the method that strips off the skin after pouring the first cross of time head base |
| CN107866700A (en) * | 2017-10-23 | 2018-04-03 | 南京钢铁股份有限公司 | A kind of control method of blank grinding depth |
| CN111993216A (en) * | 2020-07-02 | 2020-11-27 | 山西太钢不锈钢股份有限公司 | Method for manufacturing duplex stainless steel hot-rolled middle plate with surface roughness Ra less than or equal to 5 mu m |
| CN113084132A (en) * | 2021-04-02 | 2021-07-09 | 山西太钢不锈钢股份有限公司 | Production method for reducing surface defects of ferritic stainless steel plate |
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Application publication date: 20130717 |