CN104561731B - A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel - Google Patents

A kind of production method of poker characteristic uniform high tenacity 65Mn spring steel Download PDF

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CN104561731B
CN104561731B CN201410832209.4A CN201410832209A CN104561731B CN 104561731 B CN104561731 B CN 104561731B CN 201410832209 A CN201410832209 A CN 201410832209A CN 104561731 B CN104561731 B CN 104561731B
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spring steel
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晁月林
邓素怀
张玮
孙齐松
郑福印
佟倩
柳洋波
王猛
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Shougang Group Co Ltd
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CAPITAL IRON AND STEEL CO
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Abstract

一种通条性能均匀的高韧性65Mn弹簧钢的生产方法,属于弹簧钢技术领域。具体参数为:轧制时开轧温度为1000℃-1030℃,脱头后轧机入口温度为880℃-900℃;精轧入口温度为830℃-850℃;精轧后采用五段交替水冷冷却,吐丝温度为830℃-850℃;控制冷却时斯太尔磨风冷线冷却过程中,吐丝后开启风机快冷,风机后3m处开始加盖保温罩缓冷,搭接点位置入罩温度为620-630℃,出罩温度480-500℃。优点在于,实现了65Mn弹簧钢的通条性能的均匀性,增加盘条的塑韧性,提高拉拔成材率,提升弹簧钢的疲劳性能。

The invention discloses a production method of high-toughness 65Mn spring steel with uniform cleaning rod performance, belonging to the technical field of spring steel. The specific parameters are: the starting temperature during rolling is 1000°C-1030°C, the temperature at the entrance of the rolling mill is 880°C-900°C after head stripping; the temperature at the entrance of the finish rolling is 830°C-850°C; after the finish rolling, five-stage alternating water cooling is adopted , the silk spinning temperature is 830°C-850°C; during the cooling process of the Steyr mill air cooling line during cooling control, the fan is turned on for quick cooling after spinning, and the insulation cover is started to cool slowly 3m behind the fan, and the overlapping point is placed The cover temperature is 620-630°C, and the cover temperature is 480-500°C. The advantages are that the uniformity of the performance of the 65Mn spring steel is realized, the plasticity and toughness of the wire rod are increased, the drawing yield is improved, and the fatigue performance of the spring steel is improved.

Description

一种通条性能均匀的高韧性65Mn弹簧钢的生产方法A kind of production method of high-toughness 65Mn spring steel with uniform cleaning rod performance

技术领域technical field

本发明属于弹簧钢技术领域,特别涉及一种通条性能均匀的高韧性65Mn弹簧钢的生产方法。适用于提高弹簧钢盘条的面缩率,降低盘条的同圈性能波动,提高弹簧钢的疲劳性能。The invention belongs to the technical field of spring steel, in particular to a production method of high-toughness 65Mn spring steel with uniform cleaning rod performance. It is suitable for improving the area shrinkage of spring steel wire rod, reducing the performance fluctuation of the same coil of wire rod, and improving the fatigue performance of spring steel.

背景技术Background technique

弹簧作为非常重要的减震和功能部件,被广泛的应用于汽车制造业和日常生活中。根据不同的用途,要求弹簧钢具有不同级别的塑韧性和疲劳性能。因此,不同种类的弹簧钢孕育而生。现有弹簧牌号主要有65Mn、60Si2MnA、55SiCr等,分别属于Cr-V系、Cr-Mn系、Si-Mn系等等,具有淬透性好、强度高、疲劳性能优良等优点,被广泛应用于车辆弹簧生产中。As a very important shock absorption and functional component, spring is widely used in automobile manufacturing and daily life. According to different uses, spring steel is required to have different levels of ductility and fatigue properties. Therefore, different kinds of spring steel were born. The existing spring grades mainly include 65Mn, 60Si 2 MnA, 55SiCr, etc., which belong to Cr-V series, Cr-Mn series, Si-Mn series, etc., and have the advantages of good hardenability, high strength, and excellent fatigue performance. It is widely used in the production of vehicle springs.

65Mn是一种应用非常广泛的弹簧钢,主要用于普通的弹簧钢丝、汽车悬架簧、油淬火-回火弹簧钢丝、高铁用弹簧垫片等,是目前市场上最主要的弹簧用钢之一,也是部分地区用量较大的弹簧钢之一。它的用途逐渐由用于普通悬架簧向精密弹簧转变,拉拔量也逐渐向深拉拔产品转变,例如油淬火-回火钢丝,它需要盘条具有优良通条性能均匀的综合力学性能与抗疲劳断裂性能。65Mn is a widely used spring steel, mainly used for ordinary spring steel wire, automobile suspension spring, oil quenching-tempering spring steel wire, spring gasket for high-speed rail, etc. It is one of the most important spring steels on the market at present. First, it is also one of the spring steels that are used in large quantities in some areas. Its use is gradually changing from ordinary suspension springs to precision springs, and the amount of drawing is gradually changing to deep drawn products, such as oil quenching-tempering steel wire, which requires the comprehensive mechanical properties of the wire rod to have excellent and uniform cleaning properties. and fatigue fracture resistance.

65Mn弹簧钢盘条一般在后续的加工过程中需要进行冷拉拔、表面酸洗、热处理、卷簧等工艺,它们对盘条的表面质量、钢的洁净度、中心偏析、组织性能的通条均匀性等具有严格的要求,否则易于造成疲劳断裂,抗疲劳敏感性减弱,影响弹簧的使用寿命,严重者易于造成盘条冷拉拔断裂、深拉拔断裂、卷簧脆断等严重问题,从而影响钢材的成材率,降低材料的安全性能。65Mn spring steel wire rod generally needs cold drawing, surface pickling, heat treatment, coil spring and other processes in the subsequent processing process, which affect the surface quality of the wire rod, the cleanliness of the steel, the central segregation, and the performance of the cleaning rod. Uniformity has strict requirements, otherwise it is easy to cause fatigue fracture, the fatigue resistance is weakened, and the service life of the spring is affected. In severe cases, it is easy to cause serious problems such as wire rod cold drawing fracture, deep drawing fracture, coil spring brittle fracture, etc. Thereby affecting the yield of steel products and reducing the safety performance of materials.

现有工艺生产65Mn盘条的通条均匀性较差,同圈的抗拉强度波动非常大,同圈的塑性面缩率严重不均,尤其是下线面缩率较低,用户在购买成品后,需在成品库中放置1月以上才能使用,否则在冷拉拔、卷簧以及弹簧垫片绕制过程中出现断裂。因此,需要研究一种新工艺,提高钢的组织性能通条均匀性、提高钢材的塑韧性能,降低冷拉拔过程中的断丝率。The uniformity of the 65Mn wire rod produced by the existing process is poor, the tensile strength of the same coil fluctuates greatly, and the plastic surface shrinkage of the same coil is seriously uneven, especially the surface shrinkage of the end line is low. Finally, it needs to be placed in the finished product warehouse for more than 1 month before it can be used, otherwise it will break during cold drawing, coil spring and spring washer winding. Therefore, it is necessary to study a new process to improve the uniformity of the steel structure and properties, improve the ductility and toughness of the steel, and reduce the broken wire rate during the cold drawing process.

申请号为CN201210398901.1,申请日为2012.10.19日,名称为“一种65Mn弹簧钢盘条的生产工艺及65Mn弹簧盘条”的中国专利文献公开了一种65Mn盘条的生产工艺路线。该工艺路线对65Mn盘条的生产过程主要是调整加热炉制度,解决了65Mn盘条的脱碳层深度改善的问题,以及运用常规的轧制过程得到了合适的组织及高强度力学性能,但它对于盘条通条均匀性并未提及,从实施例来看,其抗拉强度与面缩率波动较大。而随着65Mn用途的广泛使用,通条均匀性为65Mn弹簧钢的主要指标。The application number is CN201210398901.1, the application date is 2012.10.19, and the Chinese patent document titled "a production process of 65Mn spring steel wire rod and 65Mn spring wire rod" discloses a production process route of 65Mn wire rod. The production process of the 65Mn wire rod in this process is mainly to adjust the heating furnace system, solve the problem of improving the depth of the decarburization layer of the 65Mn wire rod, and use the conventional rolling process to obtain a suitable structure and high-strength mechanical properties, but It does not mention the uniformity of the wire rod. From the examples, its tensile strength and area shrinkage fluctuate greatly. With the widespread use of 65Mn purposes, the uniformity of the strip is the main indicator of 65Mn spring steel.

公开号为CN103484781A,申请日为2014.1.1日,名称为“一种高强高韧性弹簧钢及其制造方法”的中国专利文献公开了一种高韧性弹簧钢,它通过调整合金成分来改变钢的抗拉强度和强韧性能,但成本较高,只适用于特殊用途的弹簧钢。而且该专利对弹簧钢生产的通条均匀性能并为提及,而从实施例来看,其抗拉强度与面缩率波动较大。The publication number is CN103484781A, the application date is January 1, 2014, and the Chinese patent document titled "A High-Strength and High-Toughness Spring Steel and Its Manufacturing Method" discloses a high-toughness spring steel, which changes the steel's properties by adjusting the alloy composition. Tensile strength and toughness, but the cost is high, only suitable for special purpose spring steel. Moreover, this patent does not mention the uniform performance of the cleaning rod produced by spring steel, but from the examples, its tensile strength and area shrinkage fluctuate greatly.

本发明全程控轧控冷,通过控制加热炉温度和时间,实现对铸坯的奥氏体化,保证钢坯头尾的温度差<30℃的同时,防止晶粒异常长大,细化组织。粗中轧,在脱头工艺环节控制轧制温度,既保证高温变形对心部疏松缩孔等缺陷的焊合性,同时在再结晶区间的下限温度轧制,保证形变奥氏体晶粒的细化。预精轧后继续采用控冷措施,实现低温精轧,最大程度的为轧后冷却储存形变能,保证组织细化。轧后水冷和低温吐丝控制精轧温升在80-100℃,这样出精轧机温度<1000℃,躲过组织异常长大的温度区间,再配合合适的冷却进一步缩短在组织长大区间的停留时间,降低长大倾向,实现轧制最大程度的组织细化,同时弱化了轧后水冷给盘条的表面应力。轧后风冷工艺采用双相区快速冷却+轧后缓慢冷却的措施,保证奥氏体相变在100-120℃过冷度的情况下相变,配合形变储存能诱导相变作用,保证相变组织的片层间距和最终索氏体团的晶粒度。轧后缓冷是为实现65Mn合金元素偏析造成的心部异常组织和应力降低,控制其在保温罩内的冷却速率,保证盘条在500℃以上充分的缓冷时间。The present invention controls the rolling and cooling in the whole process, realizes the austenitization of the billet by controlling the temperature and time of the heating furnace, ensures that the temperature difference between the head and the tail of the billet is less than 30°C, and prevents abnormal grain growth and refines the structure. Coarse and medium rolling, the rolling temperature is controlled in the head-off process, which not only ensures the weldability of high-temperature deformation to defects such as loose shrinkage cavities in the core, but also rolls at the lower limit temperature of the recrystallization range to ensure the deformation of austenite grains. refinement. After the pre-finish rolling, the cooling control measures are continued to realize the low-temperature finish rolling, and the deformation energy can be stored for cooling after rolling to the greatest extent, so as to ensure the refinement of the structure. After rolling, water cooling and low-temperature spinning control the temperature rise of finishing rolling at 80-100°C, so that the temperature of the finishing mill is less than 1000°C, avoiding the temperature range of abnormal growth of the structure, and further shortening the temperature range of the growth of the structure with appropriate cooling. The residence time reduces the growth tendency, realizes the maximum degree of rolling structure refinement, and at the same time weakens the surface stress of the water-cooled wire rod after rolling. The post-rolling air-cooling process adopts the measures of rapid cooling in the dual-phase zone + slow cooling after rolling to ensure that the phase transformation of austenite occurs at an undercooling degree of 100-120°C, and cooperates with the deformation storage energy to induce phase transformation to ensure phase transformation. The interlamellar spacing of the microstructure and the grain size of the final sorbite cluster. Slow cooling after rolling is to reduce the abnormal structure and stress of the core caused by the segregation of 65Mn alloy elements, control its cooling rate in the heat preservation cover, and ensure sufficient slow cooling time for the wire rod above 500°C.

发明内容Contents of the invention

本发明的目的在于提供一种通条性能均匀的高韧性65Mn弹簧钢的生产方法,解决了通条均匀性较差,同圈的抗拉强度波动非常大等问题。尤其提供一种能够降低65Mn弹簧钢同圈性能波动,降低的晶粒尺寸、提高组织性能均匀性,以至于改善成品盘条的拉拔性能以及成品弹簧的疲劳性能。The purpose of the present invention is to provide a production method of high-toughness 65Mn spring steel with uniform performance of the cleaning rod, which solves the problems of poor uniformity of the cleaning rod and very large fluctuations in the tensile strength of the same ring. In particular, it provides a method that can reduce the performance fluctuation of 65Mn spring steel in the same ring, reduce the grain size, improve the uniformity of the structure and performance, so as to improve the drawing performance of the finished wire rod and the fatigue performance of the finished spring.

一种通条性能均匀的高韧性65Mn弹簧钢的生产方法,通过转炉冶炼、LF炉精炼、连铸、加热炉加热、轧制、控制冷却等步骤轧制成热轧盘条。具体步骤及参数如下:The invention discloses a production method of high toughness 65Mn spring steel with uniform rod performance, which is rolled into a hot-rolled wire rod through the steps of converter smelting, LF furnace refining, continuous casting, heating furnace heating, rolling, controlled cooling and the like. The specific steps and parameters are as follows:

1、轧制:开轧温度为1000℃-1030℃,粗轧四道次采用脱头无张力轧制,脱头后轧机入口温度为880℃-900℃;预精轧后、精轧前采用水箱-回复段-水箱-回复段两段交替水冷冷却,精轧入口温度为830℃-850℃,入精轧前钢坯表面光亮,无明显黑斑。精轧后采用水箱-回复段-水箱-回复段五段交替水冷冷却的方法,吐丝温度为830℃-850℃,以达到低温吐丝、防止晶粒异常长大的目的。1. Rolling: The starting temperature is 1000°C-1030°C, and the four passes of rough rolling adopt head-off tension-free rolling, and the temperature at the entrance of the rolling mill after head-off is 880°C-900°C; The water tank-recovery section-water tank-recovery section is alternately water-cooled in two sections, and the temperature at the entrance of the finish rolling is 830°C-850°C. The surface of the billet before the finish rolling is bright without obvious black spots. After finishing rolling, the water tank-recovery section-water tank-recovery section five-stage alternate water cooling method is adopted, and the spinning temperature is 830°C-850°C to achieve low-temperature spinning and prevent abnormal grain growth.

2、控制冷却:斯太尔磨风冷线冷却过程中,吐丝后开启风机快冷,风机后3m处开始加盖保温罩缓冷,搭接点位置入罩温度为620-630℃,出罩温度480-500℃;采用前段快冷、后段缓冷的方法,以达到减少先共析铁素体的产生,细化珠光体片层间距、降低盘条内应力的目的。2. Controlled cooling: During the cooling process of the Steyr mill air cooling line, turn on the fan for quick cooling after spinning, and start to cover the heat preservation cover for slow cooling at 3m behind the fan. The temperature of the cover is 480-500 ℃; the method of quick cooling in the front section and slow cooling in the back section is adopted to reduce the generation of proeutectoid ferrite, refine the interlamellar spacing of pearlite, and reduce the internal stress of the wire rod.

步骤1中预精轧后、精轧前交替水冷冷却的冷却速度为30-50℃/s;精轧后至吐丝前水冷冷却速度为100℃/s-200℃/s。In step 1, the cooling rate of alternating water cooling after pre-finish rolling and before finish rolling is 30-50°C/s; the water-cooling rate after finish rolling and before spinning is 100°C/s-200°C/s.

步骤2中快冷的冷却速度为15℃/s-18℃/s;缓冷的冷却速度为2-3℃/s。The cooling rate of fast cooling in step 2 is 15°C/s-18°C/s; the cooling rate of slow cooling is 2-3°C/s.

本文中所提到的“同圈”指的是一盘盘条中的任意一圈,它是反应通条性能波动的一个重要指标,也是检验通条性能的一个主要手段。本文中的通条性能是通过检验多圈性能得出的。The "same circle" mentioned in this article refers to any circle in a coil of wire rod. It is an important indicator reflecting the performance fluctuation of the cleaning rod and a main means of testing the performance of the cleaning rod. The purifier performance in this article is obtained by examining the multi-turn performance.

本发明的优点在于:The advantages of the present invention are:

1)依托现有的产线设备,在不改变现有设备的前提下,采用精轧前与精轧后水冷箱-回复段-水冷箱-回复段的交替冷却巧妙的达到低温轧制的实施效果;1) Relying on the existing production line equipment, without changing the existing equipment, the alternate cooling of water cooling box-recovery section-water cooling box-recovery section before finishing rolling and after finishing rolling is used to skillfully achieve the implementation of low temperature rolling Effect;

2)通过低温轧制、低温吐丝与控制斯太尔摩风冷技术以达到细化原始奥氏体晶粒、降低同圈性能波动的目的,从而实现65Mn弹簧钢的通条性能的均匀性,增加盘条的塑韧性,提高拉拔成材率,提升弹簧钢的疲劳性能的目的。2) Through low-temperature rolling, low-temperature spinning and controlled Stelmore air-cooling technology to achieve the purpose of refining the original austenite grains and reducing the performance fluctuation of the same ring, so as to achieve the uniformity of the performance of the 65Mn spring steel rod , to increase the plasticity and toughness of the wire rod, improve the drawing yield, and improve the fatigue performance of the spring steel.

附图说明Description of drawings

图1为65Mn弹簧钢横断面500X显微组织形貌。Figure 1 is the 500X microstructure appearance of the cross-section of 65Mn spring steel.

图2为65Mn弹簧钢横断面10000X的珠光体片层间距形貌。Fig. 2 is the morphology of pearlite lamellar spacing of 65Mn spring steel cross section 10000X.

图3为65Mn弹簧钢横断面200X的一边总脱碳层最深处的显微形貌。Figure 3 is the microscopic appearance of the deepest part of the total decarburization layer on one side of the 65Mn spring steel cross-section 200X.

图4为65Mn弹簧钢横断面500X的晶粒度形貌。Figure 4 is the grain size morphology of the cross-section 500X of 65Mn spring steel.

具体实施方式detailed description

实施例1:Example 1:

利用转炉冶炼、LF炉精炼连铸出的方坯再通过加热炉加热、轧制、控制冷却等步骤轧制成热轧盘条。轧制工序,开轧温度为1025℃、粗轧四道次采用脱头无张力轧制、脱头后轧机入口温度为900℃。预精轧后、精轧前水箱采用水冷-回复-水冷-回复交替冷却,冷却速度为50℃/s;入精轧前钢坯表面光亮,无明显黑斑。精轧入口温度为845℃,精轧后至吐丝前采用水冷-回复五段控制,冷却速度为100℃/s。冷却过程工序,吐丝温度为830℃,斯太尔摩风冷线冷却过程中,吐丝后开启风机,减少先共析铁素体的产生,风机后3m处开始加盖保温罩缓冷,搭接点位置入罩温度为625℃,出罩温度480℃。吐丝后至入保温罩前,盘条的冷却速度为15℃/s;入罩后的冷却速度为3℃/s,使得冷却后盘条组织中铁素体含量降低,细化珠光体片层间距、降低盘条内应力的目的。The billets produced by converter smelting and LF furnace refining and continuous casting are then rolled into hot-rolled wire rods through steps such as heating in a heating furnace, rolling, and controlled cooling. In the rolling process, the rolling start temperature is 1025°C, and the four passes of rough rolling adopt tension-free rolling with head off, and the temperature at the entrance of the rolling mill after head off is 900°C. After the pre-finish rolling and before the finish rolling, the water tank is alternately cooled by water cooling-recovery-water cooling-recovery, and the cooling rate is 50°C/s; the surface of the billet before the finish rolling is bright without obvious black spots. The temperature at the entrance of finish rolling is 845°C. After finish rolling and before silk spinning, five stages of water cooling-recovery control are adopted, and the cooling rate is 100°C/s. In the cooling process, the silk spinning temperature is 830°C. During the cooling process of the Stelmo air-cooled line, the fan is turned on after spinning to reduce the generation of pro-eutectoid ferrite. The heat preservation cover is placed 3m behind the fan for slow cooling. The temperature at the overlapping point is 625°C when entering the hood, and 480°C when leaving the hood. The cooling rate of the wire rod is 15°C/s after spinning and before entering the insulation cover; the cooling rate after entering the cover is 3°C/s, so that the ferrite content in the wire rod structure after cooling is reduced and the pearlite sheet is refined The purpose of spacing and reducing the internal stress of the wire rod.

检测结果如下:当天下线与时效10天65Mn弹簧钢φ9mm同圈抗拉强度与面缩率见表1与表2所示。金相组织为索氏体+细片状珠光体+极少量铁素体,见图1所示;片层间距见图2所示;一边总脱碳深度小于1%,见图3所示;晶粒度为9.5级,见图4所示。The test results are as follows: see Table 1 and Table 2 for the tensile strength and area shrinkage of the same ring of 65Mn spring steel φ9mm when it was off the assembly line on the same day and aged for 10 days. The metallographic structure is sorbite + fine flaky pearlite + a very small amount of ferrite, as shown in Figure 1; the lamellar spacing is shown in Figure 2; the total decarburization depth of one side is less than 1%, as shown in Figure 3; The grain size is grade 9.5, as shown in Figure 4.

表1当天下线65Mn弹簧钢φ9mm同圈力学性能Table 1 The mechanical properties of the 65Mn spring steel φ9mm in the same coil on the same day

表2时效第10天65Mn弹簧钢φ9mm同圈力学性能Table 2 Mechanical properties of 65Mn spring steel φ9mm in the same ring on the 10th day of aging

实施例2:Example 2:

利用转炉冶炼、LF炉精炼连铸出的方坯再通过加热炉加热、轧制、控制冷却等步骤轧制成热轧盘条。轧制工序,开轧温度为1005℃、粗轧四道次采用脱头无张力轧制、脱头后轧机入口温度为890℃。预精轧后、精轧前水箱采用水冷-回复-水冷-回复交替冷却,冷却速度为41℃/s;入精轧前钢坯表面光亮,无明显黑斑。精轧入口温度为840℃,精轧后至吐丝前采用水冷-回复五段控制,冷却速度为145℃/s。冷却过程工序,吐丝温度为830℃,斯太尔摩风冷线冷却过程中,吐丝后开启风机,减少先共析铁素体的产生,风机后3m处开始加盖保温罩缓冷,搭接点位置入罩温度为620℃,出罩温度490℃。吐丝后至入保温罩前,盘条的冷却速度为18℃/s;入罩后的冷却速度为2.5℃/s,使得冷却后盘条组织中铁素体含量降低,细化珠光体片层间距、降低盘条内应力的目的。The billets produced by converter smelting and LF furnace refining and continuous casting are then rolled into hot-rolled wire rods through steps such as heating in a heating furnace, rolling, and controlled cooling. In the rolling process, the rolling start temperature is 1005°C, and the four passes of rough rolling are head-off tension-free rolling, and the temperature at the entrance of the rolling mill after head-off is 890°C. After the pre-finish rolling and before the finish rolling, the water tank is alternately cooled by water cooling-recovery-water cooling-recovery, and the cooling rate is 41°C/s; the surface of the billet before the finish rolling is bright without obvious black spots. The temperature at the entrance of finish rolling is 840°C. After finish rolling and before spinning, five stages of water cooling-recovery control are adopted, and the cooling rate is 145°C/s. In the cooling process, the silk spinning temperature is 830°C. During the cooling process of the Stelmo air-cooled line, the fan is turned on after spinning to reduce the generation of pro-eutectoid ferrite. The heat preservation cover is placed 3m behind the fan for slow cooling. The temperature at the overlapping point is 620°C when entering the cover, and 490°C when leaving the cover. The cooling rate of the wire rod is 18°C/s after spinning and before entering the insulation cover; the cooling rate after entering the cover is 2.5°C/s, which reduces the ferrite content in the wire rod structure after cooling and refines the pearlite sheet The purpose of spacing and reducing the internal stress of the wire rod.

实施例3:Example 3:

利用转炉冶炼、LF炉精炼连铸出的方坯再通过加热炉加热、轧制、控制冷却等步骤轧制成热轧盘条。轧制工序,开轧温度为1020℃、粗轧四道次采用脱头无张力轧制、脱头后轧机入口温度为880℃。预精轧后、精轧前水箱采用水冷-回复-水冷-回复交替冷却,冷却速度为30℃/s;入精轧前钢坯表面光亮,无明显黑斑。精轧入口温度为830℃,精轧后至吐丝前采用水冷-回复五段控制,冷却速度为100℃/s。冷却过程工序,吐丝温度为850℃,斯太尔摩风冷线冷却过程中,吐丝后开启风机,减少先共析铁素体的产生,风机后3m处开始加盖保温罩缓冷,搭接点位置入罩温度为630℃,出罩温度495℃。吐丝后至入保温罩前,盘条的冷却速度为15℃/s;入罩后的冷却速度为3℃/s,使得冷却后盘条组织中铁素体含量降低,细化珠光体片层间距、降低盘条内应力的目的。The billets produced by converter smelting and LF furnace refining and continuous casting are then rolled into hot-rolled wire rods through steps such as heating in a heating furnace, rolling, and controlled cooling. In the rolling process, the rolling start temperature is 1020°C, and the four passes of rough rolling adopt tension-free rolling with head off, and the temperature at the entrance of the rolling mill after head off is 880°C. After the pre-finish rolling and before the finish rolling, the water tank is alternately cooled by water cooling-recovery-water cooling-recovery, and the cooling rate is 30°C/s; the surface of the billet before the finish rolling is bright without obvious black spots. The entrance temperature of finish rolling is 830°C. After finish rolling and before silk spinning, five-stage water cooling-recovery control is adopted, and the cooling rate is 100°C/s. In the cooling process, the silk spinning temperature is 850°C. During the cooling process of the Stelmo air-cooled line, the fan is turned on after spinning to reduce the generation of pro-eutectoid ferrite. 3m behind the fan starts to cover the insulation cover for slow cooling. The temperature at the overlapping point is 630°C when entering the cover, and 495°C when leaving the cover. The cooling rate of the wire rod is 15°C/s after spinning and before entering the insulation cover; the cooling rate after entering the cover is 3°C/s, so that the ferrite content in the wire rod structure after cooling is reduced and the pearlite sheet is refined The purpose of spacing and reducing the internal stress of the wire rod.

Claims (1)

1. a production method for poker characteristic uniform high tenacity 65Mn spring steel, including converter smelting, LF stove refine, company Casting, heating furnace are heated, roll, are controlled cooling step and be rolled into gren rod, it is characterised in that concrete steps and parameter are as follows:
1) rolling: start rolling temperature is 1000 DEG C-1030 DEG C, roughing four-pass de-head tension free rolling, inlet of rolling mill after de-head Temperature is 880 DEG C-900 DEG C;Cooling by water is replaced by water tank-reply section-water tank-reply section two sections after pre-finish rolling, before finish rolling, Entry temperature at finishing is 830 DEG C-850 DEG C;Water tank-reply section-water tank-reply section five sections is used to replace cooling by water after finish rolling, Laying temperature is 830 DEG C-850 DEG C;
2) cooling is controlled: in steyr mill air-cooled line cooling procedure, open blower fan rapid cooling after weaving silk, start at 3m after blower fan to add a cover Thermal insulation cover slow cooling, overlapped points position enters cover temperature and is 620-630 DEG C, goes out cover temperature 480-500 DEG C;
Step 1) described in pre-finish rolling after, before finish rolling, alternately the rate of cooling of cooling by water is 30-50 DEG C/s;To telling after finish rolling Before silk, cooling by water speed is 100 DEG C/s-200 DEG C/s;
Step 2) described in the rate of cooling of rapid cooling be 15 DEG C/s-18 DEG C/s;The rate of cooling of slow cooling is 2-3 DEG C/s.
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