CN114085970B - Manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel - Google Patents

Manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel Download PDF

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CN114085970B
CN114085970B CN202111355959.3A CN202111355959A CN114085970B CN 114085970 B CN114085970 B CN 114085970B CN 202111355959 A CN202111355959 A CN 202111355959A CN 114085970 B CN114085970 B CN 114085970B
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heat preservation
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steel
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CN114085970A (en
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梁健浑
徐向东
方剑锋
黄卫文
谢水旺
罗杰
林杰
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Ansteel Lianzhong Guangzhou Stainless Steel Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length

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Abstract

一种克服铁素体不锈钢热轧软硬边的制造方法,在方法是对热轧钢卷采用保温坑缓冷的方式,同时利用其他热卷提供的热量,让热轧钢卷所在区域内的温度缓慢下降,使钢卷能够均匀受热,缓慢降温的。本发明采用特殊的缓慢降温措施,利用保温坑的保温功能,以及其他热卷提供热量,让一定区域内的温度缓慢下降,使钢卷达到均匀受热,缓慢降温的目的,利于γ相在相变过程中转变位α相,有效改善其机械性能,解决430\White成型性能不佳问题。

Figure 202111355959

A manufacturing method for overcoming the soft and hard edges of hot-rolled ferritic stainless steel. The method is to slowly cool the hot-rolled steel coils in a heat preservation pit, and at the same time use the heat provided by other hot coils to make the hot-rolled steel coils in the area where the hot-rolled steel coils are located The temperature drops slowly, so that the steel coil can be heated evenly and cool down slowly. The invention adopts special slow cooling measures, utilizes the heat preservation function of the heat preservation pit, and provides heat from other hot coils, so that the temperature in a certain area drops slowly, so that the steel coils can be evenly heated and slowly cooled, which is beneficial to the phase transition of the γ phase. In the process, the α phase is transformed, which effectively improves its mechanical properties and solves the problem of poor forming performance of 430\White.

Figure 202111355959

Description

一种克服铁素体不锈钢热轧软硬边的制造方法A manufacturing method for overcoming hot-rolled soft and hard edges of ferritic stainless steel

技术领域technical field

本发明属于冶金轧钢技术领域,尤其涉及一种克服铁素体不锈钢热轧软硬边的制造方法。The invention belongs to the technical field of metallurgical steel rolling, in particular to a manufacturing method for overcoming soft and hard edges in ferritic stainless steel hot rolling.

背景技术Background technique

现有430\White产品由于热轧产出后放在储区,温度不断下降,内外温差越来越大,各部分的冷却速度不均,机械性能不均匀,造成下游成型产品存在凹凸条纹,机械性能不佳问题。The existing 430\White products are placed in the storage area after hot rolling, the temperature continues to drop, the temperature difference between the inside and outside is getting bigger and bigger, the cooling speed of each part is uneven, and the mechanical properties are uneven, resulting in concave and convex stripes in the downstream formed products. Poor performance issue.

发明内容Contents of the invention

本发明的目的是提供一种克服铁素体不锈钢热轧软硬边的制造方法,达到通过对成型性能的控制,降低因性能不佳问题导致的一系列成本问题,本发明操作简单,适合工厂大规模化生产,能最大程度消除钢卷机械性能不均的问题,缓冷后钢卷表面及内部质量优良,降低了不良品的产生。The purpose of the present invention is to provide a manufacturing method that overcomes the soft and hard edges of ferritic stainless steel hot rolling, so as to reduce a series of cost problems caused by poor performance through the control of forming performance. The present invention is easy to operate and suitable for factories Large-scale production can eliminate the problem of uneven mechanical properties of steel coils to the greatest extent. After slow cooling, the surface and internal quality of steel coils are excellent, reducing the occurrence of defective products.

为实现上述目的,本发明采用以下技术方案实现:To achieve the above object, the present invention adopts the following technical solutions:

一种克服铁素体不锈钢热轧软硬边的制造方法,在方法是对热轧钢卷采用保温坑缓冷的方式,同时利用其他热卷提供的热量,让热轧钢卷所在区域内的温度缓慢下降,使钢卷能够均匀受热,缓慢降温的。A manufacturing method for overcoming the soft and hard edges of hot-rolled ferritic stainless steel. The method is to slowly cool the hot-rolled steel coils in a heat preservation pit, and at the same time use the heat provided by other hot coils to make the hot-rolled steel coils in the area where the hot-rolled steel coils are located The temperature drops slowly, so that the steel coil can be heated evenly and cool down slowly.

具体包括如下方法:Specifically include the following methods:

1)保温坑升温过程:根据生产时间应提前准备好保温坑,将热轧产出的温度在840-900℃之间的黑皮钢卷,吊运至保温坑中,利用黑皮钢卷热量提升保温坑温度,黑皮钢卷按列排布,列与列之间设置间隔,使保温坑内的温度升到400-500℃;1) Heating process of the heat preservation pit: According to the production time, the heat preservation pit should be prepared in advance, and the black steel coils produced by hot rolling with a temperature between 840-900°C are hoisted to the heat preservation pit, and the heat of the black steel coils is used. Raise the temperature of the heat preservation pit, arrange the black steel coils in columns, and set intervals between the columns, so that the temperature in the heat preservation pit rises to 400-500°C;

2)带温装炉过程:需要克服软硬边的热轧钢卷产出后马上吊运至保温坑内,并按列布置在黑皮预热钢卷之间,同时关闭保温坑,形成密闭空间;2) Furnace loading process with temperature: The hot-rolled steel coils that need to overcome the soft and hard edges are lifted to the heat preservation pit immediately after output, and arranged in rows between the black skin preheated steel coils, and the heat preservation pit is closed at the same time to form a closed space ;

3)保温过程:钢卷需在保温坑堆垛24小时以上,钢卷缓慢降温;3) Heat preservation process: the steel coils need to be stacked in the heat preservation pit for more than 24 hours, and the steel coils cool down slowly;

4)降温过程:打开保温坑上盖,与外界接触,降温速率为20~60℃/h,使温度下降到40℃,然后出炉进行下一工序处理。4) Cooling process: Open the upper cover of the heat preservation pit and contact with the outside world. The cooling rate is 20-60°C/h, so that the temperature drops to 40°C, and then it is taken out of the furnace for the next process.

所述热轧钢卷厚度为2.5~10mm,宽度为800-1500mm。The hot-rolled steel coil has a thickness of 2.5-10mm and a width of 800-1500mm.

所述热轧钢卷盘卷温度为800-1000℃。The coiling temperature of the hot-rolled steel coil is 800-1000°C.

与现有的技术相比,本发明的有益效果是:Compared with prior art, the beneficial effect of the present invention is:

1)本发明采用特殊的缓慢降温措施,利用保温坑的保温功能,以及其他热卷提供热量,让一定区域内的温度缓慢下降,使钢卷达到均匀受热,缓慢降温的目的,利于γ相在相变过程中转变位α相,有效改善其机械性能,解决430\White成型性能不佳问题。1) The present invention adopts special slow cooling measures, utilizes the heat preservation function of the heat preservation pit, and provides heat from other hot coils, so that the temperature in a certain area drops slowly, so that the steel coils can be evenly heated and slowly cooled, which is beneficial to the γ phase During the phase change process, the α phase is transformed, which effectively improves its mechanical properties and solves the problem of poor forming performance of 430\White.

2)缓冷钢卷的盘卷温度设定在880℃,既有利于钢卷下游的酸洗,同时兼顾足够高的产出温度,配合缓慢降温,改善机械性能。2) The coil temperature of the slow cooling steel coil is set at 880°C, which is not only beneficial to the pickling downstream of the steel coil, but also takes into account a sufficiently high output temperature, and cooperates with slow cooling to improve mechanical properties.

3)采用本发明可有效解决430\White成型性能不佳问题,黑皮缓冷卷较普通卷HRB低4~8,缓冷卷延伸率提高约3%~17%。3) Adopting the present invention can effectively solve the problem of poor formability of 430\White, the HRB of slow-cooled rolls with black skin is 4-8 lower than that of ordinary rolls, and the elongation of slow-cooled rolls is increased by about 3%-17%.

附图说明Description of drawings

图1是本发明实施例与未进行特别缓冷的普通钢种抗拉强度对比图。Fig. 1 is a comparative diagram of the tensile strength of the embodiment of the present invention and ordinary steel grades without special slow cooling.

图2是本发明实施例与未进行特别缓冷的普通钢种屈服强度对比图。Fig. 2 is a comparison chart of the yield strength of the embodiment of the present invention and the common steel grade without special slow cooling.

图3是本发明实施例与未进行特别缓冷的普通钢种延伸率对比图。Fig. 3 is a comparison chart of the elongation of the embodiment of the present invention and the ordinary steel grade without special slow cooling.

图4是本发明实施例与未进行特别缓冷的普通钢种硬度强度对比图。Fig. 4 is a comparison diagram of the hardness and strength of the embodiment of the present invention and ordinary steel grades without special slow cooling.

具体实施方式Detailed ways

下面结合具体实施例对本发明的实施方式进一步说明:Below in conjunction with specific embodiment the embodiment of the present invention is further described:

本发明实施例需要对没有软硬边要求的黑皮钢卷与本发明的对软硬边有要求的热轧钢卷进行先后排产,黑皮钢卷要提前3-4小时。In the embodiment of the present invention, the production of black-skinned steel coils without soft and hard edges and the hot-rolled steel coils of the present invention with soft and hard edges should be scheduled sequentially, and the black-skinned steel coils should be scheduled 3-4 hours in advance.

实施例钢种成分见表1;实施例热轧工艺参数见表2;实施例黑皮钢卷和本发明的热轧缓冷钢卷的保温坑摆放位置见表3。See Table 1 for the steel composition of the embodiment; see Table 2 for the hot-rolling process parameters of the embodiment;

表1实施例钢种成分(wt%)Table 1 embodiment steel composition (wt%)

CC SiSi Mnmn PP SS NiNi CrCr MoMo CuCu NN 0.040.04 0.350.35 0.3340.334 0.0260.026 0.0030.003 0.1410.141 16.1516.15 0.0080.008 0.0450.045 0.0450.045

表2实施例热轧工艺参数Table 2 embodiment hot rolling process parameter

Figure BDA0003357635240000021
Figure BDA0003357635240000021

Figure BDA0003357635240000031
Figure BDA0003357635240000031

表3保温坑摆放位置Table 3 Placement of heat preservation pit

Figure BDA0003357635240000032
Figure BDA0003357635240000032

1)保温坑升温过程:根据生产时间应提前准备好保温坑,待普通黑皮钢卷产出后立即吊运至保温坑中,黑皮钢卷按列排布,列与列之间设置间隔,使保温坑内的温度升到400~500℃;1) Heating process of the heat preservation pit: According to the production time, the heat preservation pit should be prepared in advance, and the ordinary black steel coils should be hoisted to the heat preservation pit immediately after they are produced. The black steel coils are arranged in columns, with intervals between columns , so that the temperature in the heat preservation pit rises to 400-500°C;

根据热轧产出的黑皮钢卷的速率(4-6分钟/卷),随着保温坑内的预热黑皮钢卷越来越多,保温坑内温度会越来越高,当预热卷放满,需要耗时3-4小时,坑内温度会达到400-500℃。According to the rate of black steel coils produced by hot rolling (4-6 minutes/coil), as more and more black steel coils are preheated in the heat preservation pit, the temperature in the heat preservation pit will become higher and higher. It takes 3-4 hours to fill it up, and the temperature in the pit will reach 400-500°C.

2)带温装炉过程:将本发明的需要克服软硬边的热轧钢卷产出后马上吊运至保温坑内,并按列布置在黑皮预热钢卷之间,同时关闭保温坑,形成密闭空间;2) Furnace loading process with temperature: the hot-rolled steel coil that needs to overcome the soft and hard edges of the present invention is immediately lifted to the heat preservation pit after being produced, and arranged in a row between the black skin preheated steel coils, and the heat preservation pit is closed at the same time , forming a closed space;

3)保温过程:钢卷需在保温坑堆垛24小时以上,钢卷缓慢降温;3) Heat preservation process: the steel coils need to be stacked in the heat preservation pit for more than 24 hours, and the steel coils cool down slowly;

4)降温过程:打开保温坑上盖,降温速率为20~60℃/h,使温度下降到40℃,然后出炉进行下一工序处理。4) Cooling process: Open the upper cover of the heat preservation pit, and the cooling rate is 20-60°C/h, so that the temperature drops to 40°C, and then it is taken out of the furnace for the next process.

本发明在热轧工艺过程中,通过保温坑有效控制钢卷温度的均匀缓慢下降,达到黑皮退火制程效果,与现有技术效果对比见图1-图4。During the hot rolling process, the invention effectively controls the uniform and slow temperature drop of the steel coil through the heat preservation pit, and achieves the effect of the annealing process of the black skin. The comparison with the effect of the prior art is shown in Fig. 1-Fig. 4 .

Claims (2)

1. A manufacturing method for overcoming hot-rolled soft and hard edges of ferrite stainless steel is characterized in that a heat preservation pit slow cooling mode is adopted for a hot-rolled steel coil, and meanwhile, the heat provided by other hot coils is utilized to enable the temperature in the area of the hot-rolled steel coil to be slowly lowered, so that the steel coil can be uniformly heated and slowly cooled;
1) And (3) heating the heat preservation pit: lifting black steel coils which are produced by hot rolling and have the temperature of 840-900 ℃ into a heat preservation pit, and lifting the temperature of the heat preservation pit by using the heat of the black steel coils, wherein the black steel coils are arranged in rows, and intervals are arranged between the rows, so that the temperature in the heat preservation pit is raised to 400-500 ℃;
2) And (3) charging at a temperature: the hot rolled steel coils needing to overcome the soft and hard edges are immediately lifted into the heat preservation pits after being produced, and are arranged between the black-skin preheating steel coils in rows, and meanwhile, the heat preservation pits are closed to form a closed space;
3) The heat preservation process comprises the following steps: stacking the steel coils in the heat preservation pit for more than 24 hours, and slowly cooling the steel coils;
4) And (3) a cooling process: opening an upper cover of the heat preservation pit, wherein the cooling rate is 20-60 ℃/h, so that the temperature is reduced to 40 ℃, and then discharging the pit for the next procedure treatment;
the coil temperature of the hot rolled steel coil is 800-1000 ℃.
2. The method for manufacturing hot rolled soft and hard edges of ferritic stainless steel according to claim 1, wherein the thickness of the hot rolled steel coil is 2.5-10 mm and the width is 800-1500mm.
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