阅读说明：本技术 高硅高锰低合金钢板的轧制工艺 (Rolling process of high-silicon high-manganese low-alloy steel plate ) 是由 陈卫池 丁乃山 李建芳 于 2020-05-20 设计创作，主要内容包括：本发明公开了高硅高锰低合金钢板的轧制工艺,工艺步骤如下：下料→钢坯加热→粗除磷→开轧前降温→第一次轧制→机后降温→第二次轧制。采用上述的高硅高锰低合金钢板的轧制工艺能制造得到高性能、高强度的高硅高锰低合金钢板,所得的高硅高锰低合金钢板的抗拉强度可达到550～720 Mpa。(The invention discloses a rolling process of a high-silicon high-manganese low-alloy steel plate, which comprises the following process steps: blanking → heating of billet → rough dephosphorization → cooling before rolling → first rolling → cooling after rolling → second rolling. The high-silicon high-manganese low-alloy steel plate with high performance and high strength can be manufactured by adopting the rolling process of the high-silicon high-manganese low-alloy steel plate, and the tensile strength of the high-silicon high-manganese low-alloy steel plate can reach 550-720 Mpa.)

1. The rolling process of the high-silicon high-manganese low-alloy steel plate comprises the following process steps: blanking → heating of steel billet → rough dephosphorization → cooling before rolling → first rolling → cooling after rolling → second rolling, which is characterized in that:

(1) in the blanking process: the steel material for blanking comprises the following chemical components in percentage by mass: c: more than 0.2 percent; si: more than 0.55 percent; mn: more than 1.6 percent; p: more than 0.035%; s: more than 0.035%; cr: more than 0.3 percent; ni: more than 0.3 percent; cu: more than 0.4 percent;

(2) in the billet heating procedure: heating the billet obtained by blanking by adopting a heating furnace with the length of 30m, wherein the heating furnace is evenly divided into a preheating section, a heating section and a heating section from front to back in sequence, the furnace temperature of the preheating section is 900 ℃, the furnace temperature of the heating section is 1160 ℃, the furnace temperature of the heating section is 1260 ℃, the furnace temperature of the heating section is 1320 ℃, and the billet is arranged along the length direction of the heating furnace in a propping manner in sequence, so that when the inlet of the heating furnace enters one unheated billet, one heated billet at the outlet of the heating furnace can be ejected out of the heating furnace;

(3) in the rough descaling procedure: the method comprises the following steps that discharged steel billets pass through a descaling box in a forward direction for four times under the conveying of a conveying roller way, after the steel billets pass through the descaling box in the forward direction, the conveying roller way can enable the steel billets to retreat through the descaling box through reverse conveying, then the steel billets pass through the descaling box in the forward direction again, a spray head which is arranged opposite to the conveying direction of the steel billets and can spray water at an angle of 40-50 degrees in an inclined mode towards the upper surface of the steel billets is arranged in the descaling box, the water pressure sprayed by the spray head is 160kg, and when the steel billets pass through the descaling box in the forward direction, the spray head can spray pressure water towards the upper surface of the steel billets to remove furnace-grown oxide;

(4) in the cooling process before rolling: after rough descaling, the steel billet is subjected to air cooling on a conveying roller way for 35-45 seconds, so that the temperature of the steel billet is reduced to 1220 +/-10 ℃;

(5) in the first rolling procedure: conveying the cooled steel billet by a conveying roller way, rolling the steel billet by a rolling mill with the rolling reduction of 12mm each time until the steel billet is rolled to the thickness of 60 +/-2 mm, and performing two-time fine descaling in the rolling process to remove oxide skin on the surface of the steel plate obtained by rolling, wherein the fine descaling is performed by spraying water at an angle of 40-50 degrees from a spray head of the rolling mill to the upper surface of the steel plate, and the water pressure sprayed by the spray head is 160 kg;

(6) in the post-machine cooling process: conveying the steel plate obtained by the first rolling to the rear of a rolling mill by a conveying roller way for air cooling for 35-45 seconds, so that the temperature of the steel plate is reduced to 900 +/-10 ℃;

(7) in the second rolling procedure: and the cooled steel plate is conveyed by the conveying roller way to enter the rolling mill again for rolling, the rolling reduction of the rolling mill is 8mm each time until the steel plate is rolled to the required thickness, and the final rolling temperature is 850 ℃.

2. The rolling process of the high-silicon high-manganese low-alloy steel plate according to claim 1, characterized in that: the rolling mill is a four high reversing type rolling mill.

3. The rolling process of a high silicon high manganese low alloy steel sheet according to claim 1 or 2, characterized in that: the specification of the billet obtained by blanking is as follows: 230mm by 1500mm by 1800mm, and a billet is produced by the heating furnace every 4.5 minutes, and the thickness of the steel plate obtained by final rolling is 16mm, and the width is 2000 mm.

4. The rolling process of a high silicon high manganese low alloy steel sheet according to claim 1 or 2, characterized in that: the burners on the two sides of the heating furnace heat alternately, so that the steel temperature is ensured, and the steel billet cannot be over-burnt.

Technical Field

The invention relates to the field of steel plate rolling processes, in particular to a rolling process of a high-silicon high-manganese low-alloy steel plate.

Background

Because the rolling force of a rolling mill of the company is small, the performance of the produced high-strength low-alloy plate is poor, and the required performance and strength can not be achieved, in order to improve the strength and the performance of the steel plate, the rolling production process of the low-alloy steel plate with high silicon and manganese contents is tried to be developed, but because the hardness of the high-silicon high-manganese steel billet is high, the heating difficulty of the steel billet is high, the rolling is difficult, the oxide skin on the surface of the steel billet can not be removed completely due to poor heating, and the surface of the product is unqualified and becomes a defective product.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: provides a rolling process of a high-silicon high-manganese low-alloy steel plate capable of manufacturing the high-silicon high-manganese low-alloy steel plate.

In order to solve the problems, the technical scheme adopted by the invention is as follows: the rolling process of the high-silicon high-manganese low-alloy steel plate comprises the following process steps: blanking → heating of steel billet → rough dephosphorization → cooling before rolling → first rolling → cooling after rolling → second rolling, which is characterized in that:

(1) in the blanking process: the steel material for blanking comprises the following chemical components in percentage by mass: c: more than 0.2 percent; si: more than 0.55 percent; mn: more than 1.6 percent; p: more than 0.035%; s: more than 0.035%; cr: more than 0.3 percent; ni: more than 0.3 percent; cu: more than 0.4 percent;

(2) in the billet heating procedure: heating the billet obtained by blanking by adopting a heating furnace with the length of 30m, wherein the heating furnace is evenly divided into a preheating section, a heating section and a heating section from front to back in sequence, the furnace temperature of the preheating section is 900 ℃, the furnace temperature of the heating section is 1160 ℃, the furnace temperature of the heating section is 1260 ℃, the furnace temperature of the heating section is 1320 ℃, and the billet is arranged along the length direction of the heating furnace in a propping manner in sequence, so that when the inlet of the heating furnace enters one unheated billet, one heated billet at the outlet of the heating furnace can be ejected out of the heating furnace;

(3) in the rough descaling procedure: the method comprises the following steps that discharged steel billets pass through a descaling box in a forward direction for four times under the conveying of a conveying roller way, after the steel billets pass through the descaling box in the forward direction, the conveying roller way can enable the steel billets to retreat through the descaling box through reverse conveying, then the steel billets pass through the descaling box in the forward direction again, a spray head which is arranged opposite to the conveying direction of the steel billets and can spray water at an angle of 40-50 degrees in an inclined mode towards the upper surface of the steel billets is arranged in the descaling box, the water pressure sprayed by the spray head is 160kg, and when the steel billets pass through the descaling box in the forward direction, the spray head can spray pressure water towards the upper surface of the steel billets to remove furnace-grown oxide;

(4) in the cooling process before rolling: after rough descaling, the steel billet is subjected to air cooling on a conveying roller way for 35-45 seconds, so that the temperature of the steel billet is reduced to 1220 +/-10 ℃;

(5) in the first rolling procedure: conveying the cooled steel billet by a conveying roller way, rolling the steel billet by a rolling mill with the rolling reduction of 12mm each time until the steel billet is rolled to the thickness of 60 +/-2 mm, and performing two-time fine descaling in the rolling process to remove oxide skin on the surface of the steel plate obtained by rolling, wherein the fine descaling is performed by spraying water at an angle of 40-50 degrees from a spray head of the rolling mill to the upper surface of the steel plate, and the water pressure sprayed by the spray head is 160 kg;

(6) in the post-machine cooling process: conveying the steel plate obtained by the first rolling to the rear of a rolling mill by a conveying roller way for air cooling for 35-45 seconds, so that the temperature of the steel plate is reduced to 900 +/-10 ℃;

(7) in the second rolling procedure: and the cooled steel plate is conveyed by the conveying roller way to enter the rolling mill again for rolling, the rolling reduction of the rolling mill is 8mm each time until the steel plate is rolled to the required thickness, and the final rolling temperature is 850 ℃.

Further, the rolling process of the high-silicon high-manganese low-alloy steel plate comprises the following steps: the rolling mill is a four high reversing type rolling mill.

Further, the rolling process of the high-silicon high-manganese low-alloy steel plate comprises the following steps: the specification of the billet obtained by blanking is as follows: 230mm by 1500mm by 1800mm, and a billet is produced by the heating furnace every 4.5 minutes, and the thickness of the steel plate obtained by final rolling is 16mm, and the width is 2000 mm.

Further, the rolling process of the high-silicon high-manganese low-alloy steel plate comprises the following steps: the burners on the two sides of the heating furnace heat alternately, so that the steel temperature is ensured, and the steel billet cannot be over-burnt.

The invention has the advantages that: the high-silicon high-manganese low-alloy steel plate with high performance and high strength can be manufactured by adopting the rolling process of the high-silicon high-manganese low-alloy steel plate, and the tensile strength of the high-silicon high-manganese low-alloy steel plate can reach 550-720 Mpa.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

The rolling process of the high-silicon high-manganese low-alloy steel plate comprises the following process steps: blanking → heating of steel billet → rough dephosphorization → cooling before rolling → first rolling → cooling after rolling → second rolling;

(1) in the blanking process: the specification of the billet obtained by blanking is as follows: 230mm by 1500mm by 1800 mm; the steel material for blanking comprises the following chemical components in percentage by mass: c: more than 0.2 percent; si: more than 0.55 percent; mn: more than 1.6 percent; p: more than 0.035%; s: more than 0.035%; cr: more than 0.3 percent; ni: more than 0.3 percent; cu: more than 0.4 percent;

(2) in the billet heating procedure: the method comprises the following steps of heating a billet obtained by blanking by adopting a heating furnace with the length of 30m, wherein during heating, burners on two sides in the heating furnace are alternately heated, so that the steel temperature is ensured, and the billet cannot be over-heated; a billet is produced by the heating furnace every 4.5 minutes; the billet can be heated better and more conveniently by adopting the heating mode, so that the internal and external temperature areas of the billet are consistent, and energy can be better saved;

(3) in the rough descaling procedure: the method comprises the following steps that discharged steel billets pass through a descaling box in a forward direction for four times under the conveying of a conveying roller way, after the steel billets pass through the descaling box in the forward direction, the conveying roller way can enable the steel billets to retreat through the descaling box through reverse conveying, then the steel billets pass through the descaling box in the forward direction again, a spray head which is arranged opposite to the conveying direction of the steel billets and can spray water at an angle of 40-50 degrees in an inclined mode towards the upper surface of the steel billets is arranged in the descaling box, the water pressure sprayed by the spray head is 160kg, and when the steel billets pass through the descaling box in the forward direction, the spray head can spray pressure water towards the upper surface of the steel billets to remove furnace-grown oxide; the furnace-generated oxide scale on the upper surface of the billet can be better removed completely through the working procedures;

(4) in the cooling process before rolling: after rough descaling, the steel billet is subjected to air cooling on a conveying roller way for 35-45 seconds, so that the temperature of the steel billet is reduced to 1220 +/-10 ℃;

(5) in the first rolling procedure: conveying the cooled steel billet by a conveying roller way, and then feeding the steel billet into a rolling mill for rolling, wherein the rolling mill is a four-roller reversible rolling mill in the embodiment, the rolling reduction of the rolling mill is 12mm each time until the steel billet is rolled to the thickness of 60 +/-2 mm, and performing two times of fine descaling in the rolling process so as to remove scale cinder on the surface of the steel plate obtained by rolling, wherein the fine descaling is performed by spraying water at an angle of 40-50 degrees obliquely to the upper surface of the steel plate through a spray head of the rolling mill, and the water pressure sprayed by the spray head is 160 kg;

(6) in the post-machine cooling process: conveying the steel plate obtained by the first rolling to the rear of a rolling mill by a conveying roller way for air cooling for 35-45 seconds, so that the temperature of the steel plate is reduced to 900 +/-10 ℃;

(7) in the second rolling procedure: and the cooled steel plate is conveyed by the conveying roller way to enter the rolling mill again for rolling, the rolling reduction of the rolling mill is 8mm each time until the thickness of the steel plate is rolled to 16mm, the width of the steel plate is 2000mm, and the final rolling temperature is 850 ℃.

The two-time rolling is used for better improving the performance and the strength of the plate.