CN115710677A - Method for improving uneven quenching hardness of 75Cr1 saw blade steel - Google Patents
Method for improving uneven quenching hardness of 75Cr1 saw blade steel Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 86
- 239000010959 steel Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000010791 quenching Methods 0.000 title claims abstract description 20
- 230000000171 quenching effect Effects 0.000 title claims abstract description 20
- 238000005096 rolling process Methods 0.000 claims abstract description 47
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000003723 Smelting Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 27
- 238000007670 refining Methods 0.000 claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 229910052742 iron Inorganic materials 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000010079 rubber tapping Methods 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 9
- 238000009749 continuous casting Methods 0.000 claims abstract description 6
- 239000006185 dispersion Substances 0.000 claims abstract description 3
- 238000005098 hot rolling Methods 0.000 claims abstract description 3
- 238000010583 slow cooling Methods 0.000 claims abstract description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 238000006477 desulfuration reaction Methods 0.000 claims description 18
- 230000023556 desulfurization Effects 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 18
- 238000005261 decarburization Methods 0.000 claims description 12
- 229910052786 argon Inorganic materials 0.000 claims description 9
- 238000011065 in-situ storage Methods 0.000 claims description 9
- 239000002893 slag Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 238000009489 vacuum treatment Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000126 substance Substances 0.000 description 7
- 239000000758 substrate Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910001339 C alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
Description
技术领域technical field
本发明涉及一种改善75Cr1锯片钢淬火硬度不均的方法。The invention relates to a method for improving the uneven quenching hardness of 75Cr1 saw blade steel.
背景技术Background technique
75Cr1钢是一种具有一定含量Cr的高碳合金工具钢，因其具有较高的强度、硬度以及超高的耐磨性而被广泛用于石材、建筑和机械制造等行业所用的锯片，包括金刚石锯片基体、硬质合金锯片基体以及金属冷切和热切圆锯片制造各种高精度切割锯片、冲头和剃刀等锯片钢。75Cr1 steel is a high-carbon alloy tool steel with a certain content of Cr. Because of its high strength, hardness and ultra-high wear resistance, it is widely used in saw blades used in industries such as stone, construction and machinery manufacturing. Including diamond saw blade substrate, carbide saw blade substrate and metal cold-cut and hot-cut circular saw blades to manufacture various high-precision cutting saw blades, punches, razors and other saw blade steels.
钢的化学成分与热处理工艺，决定了钢铁制品的机械性能与使用寿命。对于要求具有锯片基体这样高的机械性能的制品，通常采用含碳量较高的碳素钢或合金钢制造，并经淬火、中温回火，以保证得到符合性能要求的回火托氏体组织。The chemical composition and heat treatment process of steel determine the mechanical properties and service life of steel products. For products that require such high mechanical properties as the saw blade matrix, they are usually made of carbon steel or alloy steel with a high carbon content, and are quenched and tempered at a medium temperature to ensure tempered troostite that meets the performance requirements. organize.
对于锯片钢来说，最重要的力学性能是淬火、回火后的硬度。在75Cr1锯片钢的开发过程中，发现淬火后钢板出现了硬度不均的现象，不符合相关标准及用户要求。因此，如何获得淬火后硬度均匀的锯片钢，是目前需要解决的技术问题。For saw blade steel, the most important mechanical property is the hardness after quenching and tempering. During the development of 75Cr1 saw blade steel, it was found that the hardness of the steel plate after quenching was uneven, which did not meet the relevant standards and user requirements. Therefore, how to obtain saw blade steel with uniform hardness after quenching is a technical problem to be solved at present.
发明内容Contents of the invention
为了解决上述技术问题，本发明提供一种改善75Cr1锯片钢淬火硬度不均的方法，本发明的75Cr1锯片钢具有高的强度、硬度，且淬火后硬度均匀。In order to solve the above technical problems, the present invention provides a method for improving the uneven quenching hardness of 75Cr1 saw blade steel. The 75Cr1 saw blade steel of the present invention has high strength and hardness and uniform hardness after quenching.
为解决上述技术问题，本发明采用如下技术方案：In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:
本发明一种改善75Cr1锯片钢淬火硬度不均的方法，包括：A method for improving the uneven quenching hardness of 75Cr1 saw blade steel of the present invention, comprising:
(1)冶炼—连铸生产工艺流程：铁水预处理-转炉顶底复吹冶炼—LF炉外精炼—RH真空处理—板坯连铸；其中供铸机钢水成分为C：0.75～0.80％，Si：0.25～0.35％，Mn：0.70～0.90％，Cr：0.35～0.65％，Al：≤0.04％，B：0.001～0.004％，P≤0.020％，S≤0.012％，其余为Fe和不可避免的杂质；(1) Smelting-continuous casting production process: molten iron pretreatment-converter top-bottom combined blowing smelting-LF external refining-RH vacuum treatment-slab continuous casting; the molten steel composition for the casting machine is C: 0.75~0.80%, Si: 0.25～0.35%, Mn: 0.70～0.90%, Cr: 0.35～0.65%, Al: ≤0.04%, B: 0.001～0.004%, P≤0.020%, S≤0.012%, the rest is Fe and unavoidable impurities;
(2)热轧生产工艺流程：铸坯加热—粗轧—精轧—卷取—入库缓冷；铸坯出炉温度1230～1270℃，粗轧采用2机架轧机粗轧，精轧采用7机架连续变凸度轧机精轧；精轧的终轧温度为845～875℃，热轧钢带厚度8mm；冷却采用层流冷却设备，后分散冷却模式，卷取温度为680～720℃。(2) Hot rolling production process: billet heating—rough rolling—finish rolling—coiling—slow cooling in storage; billet exit temperature 1230-1270°C, rough rolling with 2-stand rolling mill, and finish rolling with 7 Rack continuous variable crown rolling mill finish rolling; finishing rolling temperature is 845-875°C, hot-rolled steel strip thickness 8mm; cooling adopts laminar flow cooling equipment, post-dispersion cooling mode, coiling temperature is 680-720°C.
进一步的，具体包括：将铁水进行脱硫预处理，采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水，转炉冶炼全程吹氩，废钢加入转炉，转炉出钢温度1655℃；LF精炼采用大渣量进行造渣脱硫，保证S≤0.012％；然后将转炉冶炼后钢水进行RH炉外精炼，根据转炉供RH钢水就位成分及温度进行深脱碳处理；板坯加热温度为1235℃，加热的时间为170min，将加热后的板坯进行高压水除磷；通过定宽压力机定宽，采用2机架粗轧，7机架CVC精轧；精轧终轧温度为845℃，成品厚度8.0mm；层流冷却采用后分散冷却，钢带温度降低到682℃进行卷取，最后即可得到所述钢带。Further, it specifically includes: desulfurization pretreatment of molten iron, decarburization and dephosphorization of molten iron by top-bottom double blowing converter smelting to obtain molten steel, argon blowing throughout the converter smelting, scrap steel is added to the converter, and the tapping temperature of the converter is 1655°C; LF refining adopts Large amount of slag is used for slagging and desulfurization to ensure S≤0.012%; then the molten steel after converter smelting is subjected to RH external refining, and deep decarburization treatment is carried out according to the in-situ composition and temperature of the RH molten steel supplied by the converter; the slab heating temperature is 1235°C, The heating time is 170 minutes, and the heated slab is subjected to high-pressure water dephosphorization; the width is fixed by a fixed-width press, and 2 stands are used for rough rolling, and 7 stands for CVC finish rolling; the finish rolling temperature is 845°C, and the finished product The thickness is 8.0mm; laminar flow cooling is adopted, followed by dispersive cooling, the temperature of the steel strip is lowered to 682° C. for coiling, and finally the steel strip can be obtained.
进一步的，具体包括：将铁水进行脱硫预处理，采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水，转炉冶炼全程吹氩，废钢加入转炉，转炉出钢温度1657℃；LF精炼采用大渣量进行造渣脱硫，保证S≤0.012％；然后将转炉冶炼后钢水进行RH炉外精炼，根据转炉供RH钢水就位成分及温度进行深脱碳处理；板坯加热温度为1237℃，加热的时间为172min，将加热后的板坯进行高压水除磷；通过定宽压力机定宽，采用2机架粗轧，7机架CVC精轧；精轧终轧温度为847℃，成品厚度8.0mm；层流冷却采用后分散冷却，钢带温度降低到684℃进行卷取，最后即可得到所述钢带。Further, it specifically includes: desulfurization pretreatment of molten iron, decarburization and dephosphorization of molten iron by top-bottom double-blown converter smelting to obtain molten steel, argon blowing throughout the converter smelting process, adding scrap steel to the converter, and the tapping temperature of the converter is 1657°C; LF refining adopts Large amount of slag is used for slagging desulfurization to ensure S≤0.012%; then the molten steel after converter smelting is subjected to RH external refining, and deep decarburization treatment is carried out according to the in-situ composition and temperature of the RH molten steel supplied by the converter; the heating temperature of the slab is 1237°C, The heating time is 172 minutes, and the heated slab is subjected to high-pressure water dephosphorization; the width is fixed by a fixed-width press, 2 stands are used for rough rolling, and 7 stands for CVC finish rolling; the finish rolling temperature is 847°C, and the finished product The thickness is 8.0 mm; laminar flow cooling is adopted, followed by dispersive cooling, the temperature of the steel strip is lowered to 684° C. for coiling, and finally the steel strip can be obtained.
进一步的，具体包括：将铁水进行脱硫预处理，采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水，转炉冶炼全程吹氩，废钢加入转炉，转炉出钢温度1653℃；LF精炼采用大渣量进行造渣脱硫，保证S≤0.012％；然后将转炉冶炼后钢水进行RH炉外精炼，根据转炉供RH钢水就位成分及温度进行深脱碳处理；板坯加热温度为1233℃，加热的时间为169min，将加热后的板坯进行高压水除磷；通过定宽压力机定宽，采用2机架粗轧，7机架CVC精轧；精轧终轧温度为846℃，成品厚度8.0mm；层流冷却采用后分散冷却，钢带温度降低到683℃进行卷取，最后即可得到所述钢带。Further, it specifically includes: desulfurization pretreatment of molten iron, decarburization and dephosphorization of molten iron by top-bottom reblowing converter smelting to obtain molten steel, argon blowing throughout the converter smelting process, scrap steel is added to the converter, and the tapping temperature of the converter is 1653°C; LF refining adopts Large amount of slag is used for slagging and desulfurization to ensure S≤0.012%; then the molten steel after converter smelting is subjected to RH external refining, and deep decarburization is carried out according to the in-situ composition and temperature of the RH molten steel supplied by the converter; the slab heating temperature is 1233°C, The heating time is 169 minutes, and the heated slab is subjected to high-pressure water dephosphorization; the width is fixed by a fixed-width press, and 2 stands are used for rough rolling, and 7 stands for CVC finish rolling; the finish rolling temperature is 846°C, and the finished product The thickness is 8.0 mm; laminar flow cooling is adopted, followed by dispersive cooling, the temperature of the steel strip is lowered to 683° C. for coiling, and finally the steel strip can be obtained.
与现有技术相比，本发明的有益技术效果：Compared with prior art, beneficial technical effect of the present invention:
本发明的75Cr1锯片钢，具有高的强度、硬度，且淬火后硬度均匀。The 75Cr1 saw blade steel of the invention has high strength and hardness and uniform hardness after quenching.
具体实施方式Detailed ways
以下通过具体实施例对本发明作更详细的描述。实施例仅仅是对本发明最佳实施方式的描述，并不对本发明的范围有任何限制。The present invention is described in more detail by specific examples below. The examples are only descriptions of the best mode of the present invention, and do not limit the scope of the present invention in any way.
实施例1Example 1
将铁水进行脱硫预处理，采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水，转炉冶炼全程吹氩，废钢加入转炉，转炉出钢温度1655℃。LF精炼采用大渣量进行造渣脱硫，保证S≤0.012％。然后将转炉冶炼后钢水进行RH炉外精炼，根据转炉供RH钢水就位成分及温度进行深脱碳处理，RH炉外精炼供铸机化学成分如表1所示。板坯加热温度为1235℃，加热的时间为170min，将加热后的板坯进行高压水除磷。通过定宽压力机定宽，采用2机架粗轧，7机架CVC精轧。精轧终轧温度为845℃，成品厚度8.0mm。层流冷却采用后分散冷却，钢带温度降低到682℃进行卷取，最后即可得到所述钢带。Desulfurization pretreatment is carried out on the molten iron, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. Argon is blown throughout the converter smelting process, scrap steel is added to the converter, and the tapping temperature of the converter is 1655°C. LF refining uses a large amount of slag for slagging and desulfurization to ensure that S≤0.012%. Then the molten steel after converter smelting is subjected to RH external refining, and deep decarburization treatment is carried out according to the in-situ composition and temperature of the RH molten steel supplied by the converter. The chemical composition of the RH external refining supply casting machine is shown in Table 1. The heating temperature of the slab is 1235° C., and the heating time is 170 minutes. The heated slab is subjected to high-pressure water dephosphorization. The width is fixed by a fixed-width press, using 2 stands for rough rolling and 7 stands for CVC finish rolling. The finish rolling temperature is 845°C, and the finished product thickness is 8.0mm. After laminar cooling is adopted, dispersed cooling is adopted, and the temperature of the steel strip is lowered to 682° C. for coiling, and finally the steel strip can be obtained.
实施例2Example 2
将铁水进行脱硫预处理，采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水，转炉冶炼全程吹氩，废钢加入转炉，转炉出钢温度1657℃。LF精炼采用大渣量进行造渣脱硫，保证S≤0.012％。然后将转炉冶炼后钢水进行RH炉外精炼，根据转炉供RH钢水就位成分及温度进行深脱碳处理，RH炉外精炼供铸机化学成分如表1所示。板坯加热温度为1237℃，加热的时间为172min，将加热后的板坯进行高压水除磷。通过定宽压力机定宽，采用2机架粗轧，7机架CVC精轧。精轧终轧温度为847℃，成品厚度8.0mm。层流冷却采用后分散冷却，钢带温度降低到684℃进行卷取，最后即可得到所述钢带。Desulfurization pretreatment is carried out on the molten iron, and the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel. Argon is blown throughout the converter smelting process, scrap steel is added to the converter, and the tapping temperature of the converter is 1657°C. LF refining uses a large amount of slag for slagging and desulfurization to ensure that S≤0.012%. Then the molten steel after converter smelting is subjected to RH external refining, and deep decarburization treatment is carried out according to the in-situ composition and temperature of the RH molten steel supplied by the converter. The chemical composition of the RH external refining supply casting machine is shown in Table 1. The heating temperature of the slab is 1237° C., and the heating time is 172 minutes. The heated slab is subjected to high-pressure water dephosphorization. The width is fixed by a fixed-width press, and 2-stand rough rolling and 7-stand CVC finish rolling are adopted. The finish rolling temperature is 847°C, and the finished product thickness is 8.0mm. After laminar cooling is adopted, dispersed cooling is adopted, and the temperature of the steel strip is lowered to 684° C. for coiling, and finally the steel strip can be obtained.
实施例3Example 3
将铁水进行脱硫预处理，采用顶底复吹转炉冶炼使铁水脱碳、脱磷得到钢水，转炉冶炼全程吹氩，废钢加入转炉，转炉出钢温度1653℃。LF精炼采用大渣量进行造渣脱硫，保证S≤0.012％。然后将转炉冶炼后钢水进行RH炉外精炼，根据转炉供RH钢水就位成分及温度进行深脱碳处理，RH炉外精炼供铸机化学成分如表1所示。板坯加热温度为1233℃，加热的时间为169min，将加热后的板坯进行高压水除磷。通过定宽压力机定宽，采用2机架粗轧，7机架CVC精轧。精轧终轧温度为846℃，成品厚度8.0mm。层流冷却采用后分散冷却，钢带温度降低到683℃进行卷取，最后即可得到所述钢带。Desulfurization pretreatment is carried out on the molten iron, the molten iron is decarburized and dephosphorized by top-bottom combined blowing converter smelting to obtain molten steel, argon is blown throughout the converter smelting process, scrap steel is added to the converter, and the tapping temperature of the converter is 1653°C. LF refining uses a large amount of slag for slagging and desulfurization to ensure that S≤0.012%. Then the molten steel after converter smelting is subjected to RH external refining, and deep decarburization treatment is carried out according to the in-situ composition and temperature of the RH molten steel supplied by the converter. The chemical composition of the RH external refining supply casting machine is shown in Table 1. The heating temperature of the slab is 1233° C., and the heating time is 169 minutes. The heated slab is subjected to high-pressure water dephosphorization. The width is fixed by a fixed-width press, and 2-stand rough rolling and 7-stand CVC finish rolling are adopted. The finish rolling temperature is 846°C, and the finished product thickness is 8.0mm. After the laminar cooling is adopted, the dispersed cooling is adopted, and the temperature of the steel strip is lowered to 683° C. for coiling, and finally the steel strip can be obtained.
对比例1Comparative example 1
制造方法按照实施例1所示的方法，不同之处在于RH炉外精炼供铸机化学成分与实施例1所用的不同，如下表1所示。The manufacturing method follows the method shown in Example 1, except that the chemical composition of the RH external refining casting machine is different from that used in Example 1, as shown in Table 1 below.
对比例2Comparative example 2
制造方法按照实施例1所示的方法，不同之处在于RH炉外精炼供铸机化学成分与实施例1所用的不同，如下表1所示。The manufacturing method follows the method shown in Example 1, except that the chemical composition of the RH external refining casting machine is different from that used in Example 1, as shown in Table 1 below.
表1本发明实施例1～3和对比例1～2钢带的化学成分(wt％)Table 1 The chemical composition (wt %) of embodiment 1～3 of the present invention and comparative example 1～2 steel band
对本发明实施例1～3和对比例1～2的钢卷进行轧态拉伸性能检验，检验结果见表2。The steel coils of Examples 1-3 of the present invention and Comparative Examples 1-2 were inspected for tensile properties as rolled, and the inspection results are shown in Table 2.
表2本发明实施例1～3和对比例1～2钢带的轧态拉伸性能Table 2 The as-rolled tensile properties of the steel strips of Examples 1 to 3 of the present invention and Comparative Examples 1 to 2
对本发明实施例1～3和对比例1～2的钢带取样进行淬火处理(加热温度840℃+保温时间20min)，之后进行硬度检验，检验结果见表3。The steel strip samples of Examples 1-3 of the present invention and Comparative Examples 1-2 were subjected to quenching treatment (heating temperature 840° C. + holding time 20 min), and then hardness testing was performed. The test results are shown in Table 3.
表3本发明实施例1～3和对比例1～2钢带的淬火硬度Table 3 The quenching hardness of the steel strips of Examples 1 to 3 of the present invention and comparative examples 1 to 2
由表2、表3可以看出，按照本发明提供的方法生产的75Cr1锯片钢拉伸性能和淬火硬度满足标准及使用要求，且淬火后硬度分布均匀。It can be seen from Table 2 and Table 3 that the tensile properties and quenching hardness of the 75Cr1 saw blade steel produced according to the method provided by the present invention meet the standards and use requirements, and the hardness distribution after quenching is uniform.
以上所述的实施例仅是对本发明的优选方式进行描述，并非对本发明的范围进行限定，在不脱离本发明设计精神的前提下，本领域普通技术人员对本发明的技术方案做出的各种变形和改进，均应落入本发明权利要求书确定的保护范围内。The above-mentioned embodiments are only to describe the preferred mode of the present invention, not to limit the scope of the present invention. Without departing from the design spirit of the present invention, those skilled in the art may make various Variations and improvements should fall within the scope of protection defined by the claims of the present invention.
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