CN103014513A - Novel wear-resistant low alloy Q345C/D steel plate and production method thereof - Google Patents
Novel wear-resistant low alloy Q345C/D steel plate and production method thereof Download PDFInfo
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- CN103014513A CN103014513A CN2012105849468A CN201210584946A CN103014513A CN 103014513 A CN103014513 A CN 103014513A CN 2012105849468 A CN2012105849468 A CN 2012105849468A CN 201210584946 A CN201210584946 A CN 201210584946A CN 103014513 A CN103014513 A CN 103014513A
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Abstract
The invention discloses a wear-resistant low alloy Q345C/D steel plate. The steel plate comprises the following elements: 0.09-0.14% of C, 0.20-0.40% of Si, 0.85-1.15% of Mn, not more than 0.018% of P, not more than 0.015% of S, 0.015-0.030% of Als, 0.010-0.030% of Nb, 0.010-0.030% of Ti, 0.20-0.30% of Cr and the balance of Fe and inevitable impurities. A production method comprises the steps of smelting in a converter, LF (ladle furnace) refining, continuous casting, casting blank slow cooling, heating, TMCP (thermomechanical control process) and slow cooling. The steel plate and the production method have the beneficial effects that through the novel composite microalloying composition design idea and concise and effective process design, the indexes of the steel plate, such as mechanical properties, ultrasonic flow detection and the like are ensured; the wear resistance of the steel plate is improved; and the steel plate has uniform properties, excellent flaw detection quality and certain wear resistance, can be widely used in engineering machinery, coal machine industry, machinery manufacturing and the like, and has good promotion significance.
Description
Technical field
The present invention relates to continuous casting and produce the plate of moderate thickness field, be specifically related to a kind of novel wear resistant low alloy steel Q345C/D steel plate and production method thereof.
Background technology
Specification 16～80mmQ345C/D is a kind of Low Alloy Steel Plate commonly used, and it has higher intensity, good cold deformation ability, and plasticity and toughness can be widely used in the projects such as all kinds of engineering machinery, bridge, building, large-sized workshop, stadium preferably.But along with the continuous progress of machine industry, the index request of mechanical means and engineering machinery is improved constantly, existing low-alloy Q345C/D steel plate is difficult to meet the demands fully, and this new departure of ad hoc meter for this reason is to satisfy user's design requirement.
Summary of the invention
For the problems referred to above, the inventor has obtained a kind of specification 16～80mm guaranteed cost, has protected the novel wear resistant low alloy steel Q345C/D steel plate of flaw detection, thereby finished the present invention through groping.
Therefore, the object of the present invention is to provide the Q345C/D steel plate of a kind of specification 16～80mm guaranteed cost, guarantor's flaw detection.
Another object of the present invention is to provide the production method of the novel wear resistant low alloy steel Q345C/D steel plate with certain wear resisting property.
For reaching above-mentioned first purpose, in the national standard scope, with the easily manganese alloy element of segregation reduction in the steel, to alleviate the segregation of steel plate inside, improve the flaw detection qualification rate of steel plate; The reduction of manganese alloy element content, can cause plate property to descend, bad stability, for guaranteeing the performance of steel plate, change in the little situation at process cost, utilize the Cr alloying element that is difficult for segregation to replace the easily Mn alloying element of segregation of a part, significantly improving the inside segregation of steel plate, in the situation of the flaw detection qualification rate of raising steel plate, the stability, uniformity of outline performance index and performance, the overall quality index of raising steel plate.
For achieving the above object, wear-resistant low-alloy steel Q345C/D steel plate of the present invention is by following elementary composition: C 0.09～0.14%, Si0.20～0.40%, Mn0.85～1.15%, P≤0.018%, S≤0.015%, Als0.015～0.030%, Nb 0.010～0.030%, Ti0.010～0.030%, Cr0.20～0.30%, all the other are Fe and inevitable impurity.
The Composition Design scheme that the present invention takes such as following table 1:
The traditional composition of table 1 and novel components contrast (unit, wt%)
The function analysis of above-mentioned chemical element is as follows:
C: be most basic strengthening element in the steel, improve intensity, but C affects the welding property of steel and affects toughness.Si: be the solution strengthening element, favourable to the intensity that improves steel plate.Mn: be the solution strengthening element, all favourable to intensity and the toughness that improves steel plate, but segregation causes detecting a flaw defective easily.P: unfavorable to welding, and have certain cold shortness, and in this steel grade, belong to harmful element, that should control is as far as possible low.S: easily form the MnS type impurity, have certain red brittleness, belong to harmful element in this steel grade, that should control is as far as possible low.Al: can play the grain refining intensificatiom effect.V, Nb, Ti: crystal grain thinning, the intensity of high steel plate and impelling strength.Cr: chromium and iron form continuous solid solution, dwindle the austenite region, significantly improve intensity and hardening capacity, and have good wear resisting property.
For achieving the above object, the production method that the present invention takes comprises: converter smelting, LF refining, continuous casting, strand slow cooling, heating, TMCP, slow cooling.
1, in described converter smelting, tapping carbon 〉=0.05%, tapping P≤0.015%, S≤0.015%; Point blows number of times and must not greater than 2 times, avoid slag under the tapping process; The argon station adds the aluminum steel deoxidation.
2, in described LF refining, take the large quantity of slag to carry out slag making, guarantee that the white slag hold-time is controlled at more than the 15min, blew by force behind ferro-niobium, ferrotianium, the ferrochrome 3 minutes, again more than the soft blow 8min.
3, in described casting process, adopt the whole process protection cast, the cast superheating temperature is controlled at 5～20 ℃, and permanent pulling rate cast entered the burial pit slow cooling 24 hours after the continuously cast bloom cutting.
4, pine in described adding, heat-up time 0.9min/mm, the holding temperature of soaking zone is controlled at 1220 ℃～1240 ℃.
5, in described TMCP, 1040 ℃～1100 ℃ of start rolling temperatures; The one-phase finishing temperature is at 920～980 ℃, and the two-stage start rolling temperature is at 800～880 ℃, steel thickness 〉=1.5 times of drying in the air, the two-stage take little depress rolling, finish rolling accumulative total draft＞50%, finishing temperature≤860 ℃; Red temperature＜750 ℃, cooling rate is controlled at 2～8 ℃/s.
6, in described slow cooling, enter burial pit temperature 〉=250 ℃; Cooling in heap time 〉=12 hour.
By combined microalloying Composition Design thinking and the brief effective process design of above novelty, guaranteed the index such as mechanical property, UT (Ultrasonic Testing) of steel plate; And improved the wear resisting property of steel plate, its plate property evenly, the flaw detection good quality, and have certain wear resisting property, can be widely used in the aspects such as engineering machinery, coal machine profession, machinofacture, be with the promotion of good sense.
Description of drawings
Below in conjunction with accompanying drawing, the present invention is further elaborated.
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is the typical gold phase constitution figure (100X) of TMCP of the present invention after rolling.
Fig. 3 is the typical gold phase constitution figure (100X) of TMCP of the present invention after rolling.
Embodiment
Wear-resistant low-alloy steel Q345C/D steel plate of the present invention is by following elementary composition: C 0.09～0.14%, Si0.20～0.40%, Mn0.85～1.15%, P≤0.018%, S≤0.015%, Als0.015～0.030%, Nb 0.010～0.030%, Ti0.010～0.030%, Cr0.20～0.30%, all the other are Fe and inevitable impurity.
The Composition Design scheme that the present invention takes such as following table 1:
The traditional composition of table 1 and novel components contrast (unit, wt%)
The production method that the present invention takes comprises: converter smelting, LF refining, continuous casting, strand slow cooling, heating, TMCP, slow cooling.
1, in described converter smelting, tapping carbon 〉=0.05%, tapping P≤0.015%, S≤0.015%; Point blows number of times and must not greater than 2 times, avoid slag under the tapping process; The argon station adds the aluminum steel deoxidation.
2, in described LF refining, take the large quantity of slag to carry out slag making, guarantee that the white slag hold-time is controlled at more than the 15min, blew by force behind ferro-niobium, ferrotianium, the ferrochrome 3 minutes, again more than the soft blow 8min.
3, in described casting process, adopt the whole process protection cast, the cast superheating temperature is controlled at 5～20 ℃, and permanent pulling rate cast entered the burial pit slow cooling 24 hours after the continuously cast bloom cutting.
4, pine in described adding, heat-up time 0.9min/mm, the holding temperature of soaking zone is controlled at 1220 ℃～1240 ℃.
5, in described TMCP, 1040 ℃～1100 ℃ of start rolling temperatures; The one-phase finishing temperature is at 920～980 ℃, and the two-stage start rolling temperature is at 800～880 ℃, steel thickness 〉=1.5 times of drying in the air, the two-stage take little depress rolling, finish rolling accumulative total draft＞50%, finishing temperature≤860 ℃; Red temperature＜750 ℃, cooling rate is controlled at 2～8 ℃/s.
[0028] 6, in described slow cooling, enters burial pit temperature 〉=250 ℃; Cooling in heap time 〉=12 hour.
Claims (2)
1. wear-resistant low-alloy steel Q345C/D steel plate, it is by following elementary composition: C 0.09～0.14%, Si0.20～0.40%, Mn0.85～1.15%, P≤0.018%, S≤0.015%, Als0.015～0.030%, Nb 0.010～0.030%, Ti0.010～0.030%, Cr0.20～0.30%, all the other are Fe and inevitable impurity.
2. the production method of wear-resistant low-alloy steel Q345C/D steel plate as claimed in claim 1 comprises converter smelting, LF refining, continuous casting, strand slow cooling, heating, TMCP, slow cooling; It is characterized in that:
(1), in described converter smelting, the tapping carbon 〉=0.05%, the tapping P≤0.015%, S≤0.015%; Point blows number of times and must not greater than 2 times, avoid slag under the tapping process; The argon station adds the aluminum steel deoxidation;
(2), in described LF refining, take the large quantity of slag to carry out slag making, guarantee that the white slag hold-time is controlled at more than the 15min, blew by force behind ferro-niobium, ferrotianium, the ferrochrome 3 minutes, again more than the soft blow 8min;
(3), in described casting process, adopt the whole process protection cast, the cast superheating temperature is controlled at 5～20 ℃, permanent pulling rate cast entered the burial pit slow cooling 24 hours after the continuously cast bloom cutting;
(4), pine in described adding, heat-up time 0.9min/mm, the holding temperature of soaking zone is controlled at 1220 ℃～1240 ℃;
(5), in described TMCP, 1040 ℃～1100 ℃ of start rolling temperatures; The one-phase finishing temperature is at 920～980 ℃, and the two-stage start rolling temperature is at 800～880 ℃, steel thickness 〉=1.5 times of drying in the air, the two-stage take little depress rolling, finish rolling accumulative total draft＞50%, finishing temperature≤860 ℃; Red temperature＜750 ℃, cooling rate is controlled at 2～8 ℃/s;
(6), in described slow cooling, enter burial pit temperature 〉=250 ℃; Cooling in heap time 〉=12 hour.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110964985A (en) * | 2019-12-11 | 2020-04-07 | 唐山中厚板材有限公司 | Molybdenum-free low-alloy wear-resistant steel plate and production method thereof |
| CN111763878A (en) * | 2020-05-29 | 2020-10-13 | 河北普阳钢铁有限公司 | Production method of 6mm S355JR steel plate |
| CN111961967A (en) * | 2020-07-31 | 2020-11-20 | 天津钢铁集团有限公司 | Steel plate for small-compression-ratio thick-specification controlled rolling type Q345GJE building structure and production method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101871083A (en) * | 2010-06-14 | 2010-10-27 | 南阳汉冶特钢有限公司 | Ultra-thick low-alloy high-strength Q345-series steel plate and production method thereof |
| CN102041447A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q345C steel plate and production method thereof |
| CN102345063A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Structural steel plate Q345Qdz35 steel for extra-thick bridge and production method thereof |
| CN102367538A (en) * | 2011-12-21 | 2012-03-07 | 南阳汉冶特钢有限公司 | Super-thick low alloy high strength Q345C steel plate and production method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871083A (en) * | 2010-06-14 | 2010-10-27 | 南阳汉冶特钢有限公司 | Ultra-thick low-alloy high-strength Q345-series steel plate and production method thereof |
| CN102041447A (en) * | 2010-12-21 | 2011-05-04 | 南阳汉冶特钢有限公司 | Q345C steel plate and production method thereof |
| CN102345063A (en) * | 2011-07-08 | 2012-02-08 | 南阳汉冶特钢有限公司 | Structural steel plate Q345Qdz35 steel for extra-thick bridge and production method thereof |
| CN102367538A (en) * | 2011-12-21 | 2012-03-07 | 南阳汉冶特钢有限公司 | Super-thick low alloy high strength Q345C steel plate and production method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110964985A (en) * | 2019-12-11 | 2020-04-07 | 唐山中厚板材有限公司 | Molybdenum-free low-alloy wear-resistant steel plate and production method thereof |
| CN111763878A (en) * | 2020-05-29 | 2020-10-13 | 河北普阳钢铁有限公司 | Production method of 6mm S355JR steel plate |
| CN111961967A (en) * | 2020-07-31 | 2020-11-20 | 天津钢铁集团有限公司 | Steel plate for small-compression-ratio thick-specification controlled rolling type Q345GJE building structure and production method thereof |
| CN111961967B (en) * | 2020-07-31 | 2021-09-21 | 天津钢铁集团有限公司 | Steel plate for small-compression-ratio thick-specification controlled rolling type Q345GJE building structure and production method thereof |
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Application publication date: 20130403 |