KR100467970B1 - Method for manufacturing heat resisting alloy bar by warm surface working - Google Patents
Method for manufacturing heat resisting alloy bar by warm surface working Download PDFInfo
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- KR100467970B1 KR100467970B1 KR10-2002-0014402A KR20020014402A KR100467970B1 KR 100467970 B1 KR100467970 B1 KR 100467970B1 KR 20020014402 A KR20020014402 A KR 20020014402A KR 100467970 B1 KR100467970 B1 KR 100467970B1
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- C—CHEMISTRY; METALLURGY
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C21D—MODIFYING 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C21D—MODIFYING 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0075—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rods of limited length
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
본 발명은 내연소기관의 배기밸브 등으로 사용되는 내열강봉의 제조방법에 관한 것으로, 그 목적은 중간의 응력제거소둔 열처리공정을 생략하면서 인발공정과 교정공정을 일괄하여 연속적 (In-Line)으로 수행할 수 있는 내열강봉의 제조방법을 제공하는데, 그 목적이 있다.The present invention relates to a method for manufacturing a heat-resistant steel bar used as an exhaust valve of an internal combustion engine, the object of which is to carry out a continuous (In-Line) in a pull-out process and a calibration process while omitting the intermediate stress relief annealing process It is to provide a method of manufacturing a heat-resistant steel bar, which has its purpose.
상기 목적을 달성하기 위한 본 발명은, 내열강선재를 인발하여 내열강봉으로 신선하고 절단하여 일정길이의 내열강봉을 얻은 다음, 내열강봉을 응력제거소둔열처리 하고, 교정하는 공정을 포함하여 이루어지는 내열강봉의 제조방법에 있어서,The present invention for achieving the above object is drawn to the heat-resistant steel wire drawing and cutting with a heat-resistant steel bar to obtain a heat-resistant steel bar of a certain length, and then to produce a heat-resistant steel bar comprising a step of stress-treating annealing heat-resistant steel bar, and correcting In the method,
상기 내열강선재를 200~500℃의 온도로 가열하여 이 온도구간에서 온간인발하여 내열강봉으로 신선하고, 상기 응력제거소둔열처리를 생략하고 온간인발공정에서의 가공발열에 의해 200~500℃의 온도를 갖는 내열강봉을 연속하여 온간교정하는 것을 포함하여 이루어지는 온간표면가공법에 의한 내열강봉의 제조방법에 관한 것을 그 기술요지로 한다.The heat-resistant steel wire is heated to a temperature of 200 ~ 500 ℃ and drawn in this temperature section and drawn with a heat resistant steel bar, the stress relief annealing heat treatment is omitted, and the temperature of 200 ~ 500 ℃ by processing heat in the warm drawing process The technical gist of the present invention relates to a method for producing a heat resistant steel bar by a warm surface processing method comprising continuously warming a heat resistant steel bar.
Description
본 발명은 내연소기관의 배기밸브 등으로 사용되는 내열강봉의 제조방법에 관한 것으로, 보다 상세하게는 인발과 교정을 온간에서 행함으로써 응력제거소둔열처리를 생략하여 일괄라인을 통해 내열강봉을 제조하는 방법에 관한 것이다.The present invention relates to a method for manufacturing a heat resistant steel bar used as an exhaust valve of an internal combustion engine, and more particularly, to a method for manufacturing a heat resistant steel bar through a batch line by omitting the stress relief annealing heat treatment by drawing and correcting at a warm temperature. It is about.
자동차, 오토바이, 선박 등의 내연소기관의 배기밸브 소재로는 내열합금이 사용되며, 이 내열합금으로는 STR35강이 대표적이다. STR35의 내열합금은 내열강을 열간선재압연한 다음 고온피로강도와 고온강도를 얻기 위하여 고온(약 1100℃이상)에서 용체화 처리한 후에 700-800℃ 온도 범위에서 시효처리를 행하여 얻은 선재를 냉간인발공정을 통해 내열강봉으로 가공한 다음, 내열강봉을 원하는 제품으로 가공하여 사용하고 있다.Heat-resistant alloys are used for exhaust valves of internal combustion engines such as automobiles, motorcycles, and ships, and STR35 steel is a typical heat-resistant alloy. Heat-resistant alloy of STR35 is cold drawn of wire rod obtained by hot-rolling steel wire and then solution treatment at high temperature (about 1100 ℃) to obtain high temperature fatigue strength and high temperature strength. After processing the heat-resistant steel bar through the process, the heat-resistant steel bar is processed into a desired product.
배기밸브 소재로서의 내열강봉에 요구되는 특성은 고온강도와 고온피로 특성은 물론이고, 내마모특성과 가공측면에서 고경도와 고직진도의 확보가 매우 중요하다. 표면경도는 로크웰 C스케일로 HRC 32-42 범위를 만족시켜야 하고 직진도는 0.5/1000 mm이하를 만족시켜야 한다.The characteristics required for heat resistant steel bar as exhaust valve material are high temperature strength and high temperature fatigue properties, as well as high wear resistance and high straightness in terms of processing. The surface hardness should meet the HRC 32-42 range with Rockwell C-scale and the straightness less than 0.5 / 1000 mm.
도 1에는 고경도와 고직진도를 만족하는 내열강봉을 제조하기 위한 종래의 제조공정이 나타나 있다. 용체화처리한 선재를 냉간 인발하여 봉 형상으로 만들고 일정길이로 절단한 다음, 잔류응력 제거를 위한 열처리를 하고 나서 냉간 2-롤 교정을 실시하는 3단계의 공정을 거친다. 냉간인발 후 바로 직접 2-롤 교정을 실시 할 경우 항복강도 85~95kg/mm2, 인장강도 115kg/mm2이상의 고강도인 STR 35강종이 냉간 인발가공에 의해서 가공강화되어 2-롤 교정에서 0.5/1000 mm의 직진도 확보에 어려움이 많고 불량율이 매우 높기 때문에 응력제거를 위한 소둔처리를 행하고 있다. 또한, 중간에 응력제거소둔처리를 하지 않는 경우는 냉간교정시 2-롤의 압하량의 증감 및 표면부 마찰열 발생에 의한 소재의 조직 불안정으로 표면과 심부의 과도한 경도편차가 발생하는 문제점도 있었고, 이러한 요인으로 냉간 절단(shearing)시 소재의 절단면이 불규칙하게 절단되는 현상이 있었다 .1 shows a conventional manufacturing process for manufacturing a heat resistant steel bar that satisfies high hardness and high straightness. The solution-treated wire rod is cold drawn to form a rod, cut to a certain length, heat treated to remove residual stress, and then subjected to cold two-roll calibration. In case of performing direct 2-roll straightening after cold drawing, STR 35 steels with high yield strength of 85 ~ 95kg / mm 2 and tensile strength of 115kg / mm 2 or more are processed and hardened by cold drawing, so that 0.5 / Since it is difficult to secure the straightness of 1000 mm and the defect rate is very high, annealing treatment is performed to remove the stress. In addition, when the stress relief annealing process is not performed in the middle, there is a problem that excessive hardness deviation of the surface and the core occurs due to the instability of the material due to the increase and decrease of the rolling reduction of the 2-roll and the generation of frictional heat at the surface during cold calibration. Due to these factors, there was a phenomenon that the cut surface of the material was irregularly cut during cold shearing.
따라서, 인발공정과 교정공정사이의 응력제거소둔열처리를 반드시 경유해야 하지만, 이로 인해 3개의 다른 설비 및 공정을 거치므로 제조공정이 복잡하고, 제조공기 측면에서도 장시간이 소요되어 제조원가가 상승되는 문제점이 있다.Therefore, the stress relief annealing heat treatment between the drawing process and the calibration process must be carried out. However, the manufacturing process is complicated due to three different facilities and processes, and the manufacturing cost is increased due to the long time in terms of manufacturing air. have.
본 발명에서는 온간인발공정과 온간교정공정을 채택하여 중간의 응력제거소둔열처리공정을 생략함으로써 인발공정과 교정공정을 연속적 (In-Line)으로 수행하여 내열강봉을 제조할 수 있는 방법을 제공하는데, 그 목적이 있다.In the present invention, by adopting a warm drawing process and a warm calibration process, by eliminating the intermediate stress relief annealing process provides a method for producing a heat-resistant steel bar by performing the drawing process and the calibration process continuously (In-Line), The purpose is.
도 1은 종래방법에 따른 내열강봉의 제조공정도1 is a manufacturing process of the heat-resistant steel bar according to the conventional method
도 2는 본 발명의 온간표면가공법에 의한 내열강봉의 제조공정도2 is a manufacturing process diagram of the heat-resistant steel bar by the warm surface processing method of the present invention
상기 목적을 달성하기 위한 본 발명의 내열강봉의 제조방법은, 내열강선재를 인발하여 내열강봉으로 신선하고 절단하여 일정길이의 내열강봉으로 얻은 다음, 내열강봉을 응력제거소둔열처리 하고, 교정하는 공정을 포함하여 이루어지는 내열강봉의 제조방법에 있어서, 상기 내열강선재를 200~500℃의 온도로 가열하여 이 온도구간에서 온간인발하여 내열강봉으로 신선하고, 상기 응력제거소둔열처리를 생략하고 온간인발공정에서의 가공발열에 의해 200~500℃의 온도를 갖는 내열강봉을 연속하여 온간교정하는 것을 포함하여 구성된다.The manufacturing method of the heat-resistant steel bar of the present invention for achieving the above object, the heat-resistant steel wire is drawn, cut into a heat-resistant steel bar and cut to obtain a heat-resistant steel bar of a certain length, and then the heat-resistant steel bar is subjected to stress relief annealing heat treatment, the process of correcting In the method of manufacturing a heat-resistant steel bar made by heating, the heat-resistant steel wire is heated to a temperature of 200 ~ 500 ℃ and drawn in this temperature section and drawn into a heat-resistant steel bar, omitting the stress relief annealing heat treatment processing heat in the drawing process It consists of including continuously warm-proofing the heat resistant steel bar which has the temperature of 200-500 degreeC by.
보다 바람직하게는, 본 발명에서는 내열강선재를 직접통전에 의해 200~500℃의 온도로 전기저항가열한 다음에 그 후에는 별도의 열처리없이 온간인발과 온간교정을 행하는 것이다. 온간인발공정에서 인발비는 2~6%로 하는 것이 바람직하다.More preferably, in the present invention, the heat resistance steel wire is heated to a temperature of 200 to 500 ° C. by direct energization, and thereafter, hot drawing and warm calibration are performed without additional heat treatment. In the warm drawing process, the drawing ratio is preferably 2 to 6%.
본 발명에 적용될 수 있는 가장 바람직한 내열강봉은 항복강도 85~95kg/mm2, 인장강도 115kg/mm2이상의 고강도로서, C: 0.1-0.6%, Si: 0.1-1.0%, Mn: 8.0-11.0%, Cr: 19-25%, Ni: 3.0-10.0%, N: 0.1-0.6%, Mo:0.1~5.0%, V: 0.03-1.0%로 조성되는 것이다.The most preferable heat-resistant steel bar that can be applied to the present invention is a high strength of yield strength of 85 ~ 95kg / mm 2 , tensile strength of 115kg / mm 2 or more, C: 0.1-0.6%, Si: 0.1-1.0%, Mn: 8.0-11.0%, Cr: 19-25%, Ni: 3.0-10.0%, N: 0.1-0.6%, Mo: 0.1-5.0%, V: 0.03-1.0%.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
본 발명자들은 별도의 응력제거소둔열처리 공정을 수행하지 않고서도 원하는 경도와 직진도를 확보할 수 있는 방안에 대하여 연구하던중에, 내열강 선재를 온간에서 인발하고 교정하면 인발공정에서의 가공경화에 따른 직진도의 문제를 해결할 수 있다는 사실에 주목하여 본 발명을 완성한 것이다.The inventors of the present invention while researching a method to secure the desired hardness and straightness without performing a separate stress relief annealing process, if the heat-resistant steel wire is drawn and calibrated in a warm state, the straight line according to the work hardening in the drawing process The present invention has been completed by paying attention to the fact that the problem of Fig. Can be solved.
또한, 본 발명의 연구에 따르면 온간인발은 표층부경도 변화에 주요한 영향을 미치며, 온간교정은 봉의 중심부 경도값에 미친다는 점이다. 따라서, 온간인발조건과 온간교정조건을 적절히 설정하면 표면과 심부의 경도편차를 줄여 절단면의 불규칙을 방지할 수 있다는 것이다.In addition, according to the study of the present invention, the warm draw has a major influence on the surface layer hardness change, and the warm correction extends to the central hardness value of the rod. Therefore, if the warm drawing conditions and the warm calibration conditions are appropriately set, it is possible to prevent the irregularity of the cut surface by reducing the hardness deviation of the surface and the core.
이러한 관점에서 완성된 본 발명의 온간인발과 온간교정은 200℃이상에서 행하는 것이 바람직하다. 온간가공조건이 200℃미만의 경우에는 직진도 불량율이 증대되기 때문이다. 바람직하게는 가열온도를 200~500℃로 하는 것이다. 가열온도가 500℃보다 높을 경우에는 인발 윤활제의 선택에 어려움이 있을 뿐만 아니라 이 온도 이상으로 가열하여도 더 이상의 품질향상을 기대할 수 없으므로 에너지 효율 측면에서도 바람직하지 않다. 가장 바람직하게는 실시예의 결과에서 알 수 있듯이 300~400℃로 하는 것이다.It is preferable to carry out the warm drawing and warm calibration of this invention completed from such a viewpoint at 200 degreeC or more. This is because the straightness failure rate increases when the warm processing condition is less than 200 ° C. Preferably heating temperature is 200-500 degreeC. If the heating temperature is higher than 500 ℃ not only is difficult to select the drawing lubricant, but even heating above this temperature can not be expected to further improve the quality is not preferable in terms of energy efficiency. Most preferably it is set to 300 ~ 400 ℃ as can be seen from the results of the examples.
본 발명에서 선재의 가열은 직접통전에 의해 200~500℃의 온도로 전기저항가열하여 이 온도구간에서 온간인발가공하는 것이 바람직하다. 가열수단으로 유도가열도 생각할 수 있으나, 빠른시간에 선재를 균일하게 가열할 수 있다는 측면에서 전기저항가열이 권장된다. 또한, 온간인발가공공정에서의 가공발열에 의해 200~500℃의 온도를 갖는 내열강봉을 이 온도구간에서 온간교정한다.In the present invention, the heating of the wire rod is preferably performed by heating the electrical resistance to a temperature of 200 ~ 500 ℃ by direct conduction in this temperature range. Induction heating may be considered as a heating means, but electric resistance heating is recommended in that it can heat wires uniformly in a short time. In addition, heat-resistant steel bars having a temperature of 200 to 500 ° C. are warmly calibrated in this temperature section by the processing heat in the warm drawing process.
본 발명의 온간인발공정에서는 인발비를 통상의 인발비(10~15%) 보다 낮게 한다. 종래에는 인발후 직선된 봉강이 열간선재압연시의 제품형상인 환형(Loop)으로 되돌아 가는 복원력을 방지하기 위하여 인발비를 높게 적용하고 있었다. 그러나, 본 발명에서는 온간인발가공하므로 직선된 봉강의 복원력을 근복적으로 억제할 수 있다. 또한, 인발비를 10%이상으로 높게 할 경우 고경도 특성인 내열강의 과도한 표면가공경화로 제품의 표면경도가 너무 높아져서 표면경도저감을 위한 소둔열처리 및 교정공정이 추가되는 문제점이 있다. 따라서, 본 발명에서는 최적경도값(HRC 37~42)을 얻기 위하여 온간인발공정에서 인발비를 6%로 하는 것이 바람직하다. 그런데, 인발비를 2%미만으로 낮게 할 경우 열간압연된 선제품에서 인정하고 있는 제품의 편경차 범위내에서 인발작업되어 한 단면내에 표면위치별 혹은 표면/심부간의 경도편차가 발생하여 냉간절단시 불규칙한 단면의 깨짐이 발생할 우려가 있고, 불규칙한 단면은 맞대기 용접시 불량품 발생율이 높은 문제점이 있으므로, 적정 인발비는 2~6%로 하는 것이 가장 바람직하다.In the warm drawing process of the present invention, the drawing ratio is lower than the normal drawing ratio (10-15%). Conventionally, the drawing ratio was applied to prevent the restoring force of the straight bar after drawing back to the loop, which is a product shape during hot wire rolling. However, in the present invention, since the warm drawing process, the restoring force of the straight steel bar can be suppressed in recent years. In addition, when the drawing ratio is increased to 10% or more, the surface hardness of the product is too high due to excessive surface processing hardening of heat resistant steel, which is a high hardness property, and there is a problem in that annealing heat treatment and a correction process for reducing surface hardness are added. Therefore, in the present invention, in order to obtain the optimum hardness value (HRC 37 ~ 42), it is preferable to set the draw ratio to 6% in the warm drawing process. However, when the drawing ratio is lowered to less than 2%, the drawing work is performed within the deviation range of the product recognized by the hot rolled wire product, so that the hardness deviation between the surface location or the surface / deep part is generated in one section. There is a possibility that the irregular cross-section breaks, and the irregular cross-section has a problem of high occurrence of defective products during butt welding, it is most preferable to set the proper drawing ratio to 2-6%.
본 발명에 적용될 수 있는 내열봉강은 STR35(SUH35라고도 함)로서, 그 대표적인 성분의 일례는 중량비로 C: 0.1-0.6%, Si: 0.1-1.0%, Mn: 8.0-11.0%, Cr: 19-25%, Ni: 3.0-10.0%, N: 0.1-0.6%, V: 0.03-1.0% 나머지 Fe와 기타 불가피한 불순물로 조성되는 강이다. 합금원소로서 Mo:0.1~5.0%이 첨가되는 경우도 있다.The heat resistant steel that can be applied to the present invention is STR35 (also called SUH35), and one example of the representative components thereof is C: 0.1-0.6%, Si: 0.1-1.0%, Mn: 8.0-11.0%, Cr: 19- 25%, Ni: 3.0-10.0%, N: 0.1-0.6%, V: 0.03-1.0% The steel is composed of the remaining Fe and other unavoidable impurities. As an alloying element, Mo: 0.1 to 5.0% may be added.
본 발명에서는 냉간인발-응력제거소둔열처리-냉간교정의 공정을 채택하는 봉강제조공정의 개선에 유용하게 적용될 수 있다. 이때, 그 적용대상재에 따라 온간인발과 온간교정의 조건을 적절히 선정하여 응력제거소둔열처리를 생략하면서 연속공정을 채택하여 봉강의 직진도를 확보할 수 있는 것이다. 따라서, 적용대상재가 STR35의 내열강재가 아니더라도 다양한 봉강의 제조공정에 본 발명의 응용을 생각해 볼 수 있는 것이다.In the present invention, it can be usefully applied to the improvement of the steel manufacturing process that adopts the process of cold drawing-stress removal annealing heat treatment-cold correction. At this time, it is possible to secure the straightness of the steel bar by adopting a continuous process while omitting the stress relief annealing heat treatment by appropriately selecting the conditions of warm drawing and warm calibration according to the applied material. Therefore, even if the material to be applied is not the heat resistant steel of STR35, the application of the present invention can be considered in the manufacturing process of various steel bars.
본 발명에 따라 인발과 교정을 일괄처리하는 봉강제조장치의 일례가 도 2에 제시되어 있으며, 이를 설명하면 다음과 같다.An example of a bar manufacturing apparatus for batch processing and drawing according to the present invention is shown in FIG. 2, which will be described below.
봉강제조장치는, 한쌍의 양극 롤형전극과 한쌍의 음극의 롤형전극을 구비하여 연속이동하는 선재에 직접통전하여 가열하는 전기저항가열기와,The steel bar manufacturing apparatus includes an electric resistance heater which has a pair of positive electrode roll-shaped electrodes and a pair of negative electrode roll-shaped electrodes and directly energizes and heats a continuously moving wire;
상기 전기저항가열기의 후단에 설치되어 가열된 선재를 봉강으로 인발하는 인발기.A drawing machine installed at the rear end of the electric resistance heater to draw the heated wire rod into the steel bar.
인발된 봉강을 일정길이로 절단하는 전단기 및Shearer for cutting the drawn bar to a certain length and
상기 일정길이의 봉강을 전단기의 후단에 설치되어 봉강의 직진도를 확보하는 롤교정기가 연속적(In-Line)으로 구성되어 선재를 봉강으로 일괄처리한다.The steel bar of a predetermined length is installed at the rear end of the shearing machine, and a roll straightener for securing the straightness of the steel bar is continuously configured (In-Line) to collectively process the wire rod into the steel bar.
바람직하게는 상기 전기저항가열기의 선단에는 수평/수직 레벌러, 선재의 표면산화층을 제거하는 표면산화층제거기가 설치될 수 있다. 또한, 상기 인발기과 전단기의 사이에는 수평/수직 레벌러가 배치될 수 있다. 본 발명에서 롤형교정기는 2-롤 교정기가 바람직하다. 롤형전극재로는 Cu를 예로 들 수 있다.Preferably, a front surface oxide layer remover may be installed at the front end of the electric resistance heater to remove the surface oxide layer of the wire rod. In addition, a horizontal / vertical leveler may be disposed between the drawer and the shearer. In the present invention, the roll type calibrator is preferably a two-roll calibrator. Cu is mentioned as a rolled electrode material.
이하, 본 발명을 실시예를 통하여 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
[실시예 1]Example 1
STR35 내열강 선재를 도 2의 봉강 일괄처리 제조설비에서 온간인발공정과 온간교정공정에서의 온도조건을 변화시켜 봉강으로 제조한 다음에 온도에 따라 내열봉강의 직진도를 조사하고 그 결과를 표 1에 나타내었다.STR35 heat-resistant steel wire is made of steel bar by varying the temperature conditions in the warm drawing process and the warm calibration process in the steel bar batch manufacturing equipment of FIG. 2, and then the straightness of the heat-resistant steel bar is investigated according to the temperature. Indicated.
표 1에 나타난 바와 같이, 200℃의 경우에는 0.5/1000 mm 요구 직진도의 불량율이5% 이하이고 300℃ 이상에서는 0.1% 이하의 불량율을 나타내었다.As shown in Table 1, in the case of 200 ° C., the defective rate of the required straightness of 0.5 / 1000 mm is 5% or less, and at 300 ° C. or more, the defective rate is 0.1% or less.
[실시예 2]Example 2
STR35내열강선재를 도 2의 봉강 일괄처리 제조설비에서 350℃로 가열하여 표 2의 인발비에 따라 온간인발가공하고 교정한 다음, 인발비에 따른 최적경도값인 HRC를 측정하여 그 결과를 표 2에 나타내었다.The STR35 heat-resistant steel wire was heated to 350 ° C in the bar batch manufacturing facility of FIG. 2, warm drawn and calibrated according to the drawing ratio of Table 2, and then the HRC, which is the optimum hardness value according to the drawing ratio, was measured and the results are shown in Table 2 Shown in
표 2에 나타난 바와 같이, 인발비를 2~6%로 할 때 최적경도값을 얻을 수 있다.As shown in Table 2, the optimum hardness value can be obtained when the draw ratio is 2 to 6%.
상술한 바와 같이, 본 발명에 따르면 인발공정, 응력제거소둔열처리, 교정공정을 3단계로 비연속식의 복잡한 공정을 거쳐서 생산하는 종래의 방법을 온간인발공정과 온간교정공정의 2단계로 연속하여 일괄처리하면서도 동등 이상의 품질 수준을 확보하여 생산성을 향상시키고, 제조공기 단축 및 제조원가를 절감을 유용한 효과가 있는 것이다.As described above, according to the present invention, the conventional method of producing the drawing process, the stress relief annealing heat treatment, and the calibration process in three stages in a non-continuous complex process is continuously performed in two stages of a warm drawing process and a warm calibration process. While batch processing, it is possible to improve the productivity by securing an equal or higher quality level, and to shorten manufacturing air and reduce manufacturing costs.
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| JPH0751736A (en) * | 1993-08-16 | 1995-02-28 | Daido Steel Co Ltd | Device for manufacturing cold finished steel bar |
| JPH0847710A (en) * | 1994-08-08 | 1996-02-20 | Daido Steel Co Ltd | Manufacture of cold finished steel bar made of high-speed tool steel |
| JPH0847709A (en) * | 1994-08-08 | 1996-02-20 | Daido Steel Co Ltd | Manufacture of cold finished steel bar made of heat-resisting steel |
| KR20030068612A (en) * | 2002-02-15 | 2003-08-25 | 포스코신기술연구조합 | Manufacturing method of heat resisting alloy to prohibit the abnormal grain growh |
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| JPH0751736A (en) * | 1993-08-16 | 1995-02-28 | Daido Steel Co Ltd | Device for manufacturing cold finished steel bar |
| JPH0847710A (en) * | 1994-08-08 | 1996-02-20 | Daido Steel Co Ltd | Manufacture of cold finished steel bar made of high-speed tool steel |
| JPH0847709A (en) * | 1994-08-08 | 1996-02-20 | Daido Steel Co Ltd | Manufacture of cold finished steel bar made of heat-resisting steel |
| KR20030068612A (en) * | 2002-02-15 | 2003-08-25 | 포스코신기술연구조합 | Manufacturing method of heat resisting alloy to prohibit the abnormal grain growh |
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