KR100717506B1 - Manufacturing method of low hardness martensitic stainless steel - Google Patents
Manufacturing method of low hardness martensitic stainless steel Download PDFInfo
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- KR100717506B1 KR100717506B1 KR1020050127406A KR20050127406A KR100717506B1 KR 100717506 B1 KR100717506 B1 KR 100717506B1 KR 1020050127406 A KR1020050127406 A KR 1020050127406A KR 20050127406 A KR20050127406 A KR 20050127406A KR 100717506 B1 KR100717506 B1 KR 100717506B1
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 229910001105 martensitic stainless steel Inorganic materials 0.000 title claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 7
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 7
- 229910052802 copper Inorganic materials 0.000 claims abstract description 4
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 239000013078 crystal Substances 0.000 claims 2
- 238000010791 quenching Methods 0.000 abstract description 10
- 230000000171 quenching effect Effects 0.000 abstract description 5
- 229910001220 stainless steel Inorganic materials 0.000 abstract description 5
- 239000010935 stainless steel Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 7
- 239000011572 manganese Substances 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000005275 alloying Methods 0.000 description 2
- 239000012467 final product Substances 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005211 surface analysis Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- FHKPLLOSJHHKNU-INIZCTEOSA-N [(3S)-3-[8-(1-ethyl-5-methylpyrazol-4-yl)-9-methylpurin-6-yl]oxypyrrolidin-1-yl]-(oxan-4-yl)methanone Chemical compound C(C)N1N=CC(=C1C)C=1N(C2=NC=NC(=C2N=1)O[C@@H]1CN(CC1)C(=O)C1CCOCC1)C FHKPLLOSJHHKNU-INIZCTEOSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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Abstract
본 발명은 오토바이 디스크 브레이크 등에 이용되는 저경도 마르텐사이트계 스테인레스강의 목표 경도를 확보하기 위한 소입 열처리 조건에 관한 것이다.The present invention relates to a hardening heat treatment condition for securing a target hardness of low hardness martensitic stainless steel used in motorcycle disc brakes and the like.
본 발명은 중량%로 Cr: 10.5~14.5%, C: 0.02~0.10%, Si: 0.2~0.6%, Cu: 0.2~0.5%, Mn: 0.5% 이하, P:0.04%이하, S:0.03% 이하, Ni: 0.6% 이하, N: 0.07% 이하를 함유하고 나머지 Fe 와 기타 불가피한 원소로 이루어지는 오토바이 디스크 브레이크용 저경도 마르텐사이트 스테인레스강을 하기의 경도 예측식을 이용하여 열처리 온도와 유지시간을 조절하여 소입 열처리 하는 것을 특징으로 하는 저경도 마르텐사이트 스테인레스강의 제조방법을 제공하는 것을 요지로 한다.In the present invention, Cr: 10.5 to 14.5%, C: 0.02 to 0.10%, Si: 0.2 to 0.6%, Cu: 0.2 to 0.5%, Mn: 0.5% or less, P: 0.04% or less, S: 0.03% The heat treatment temperature and the holding time of the low hardness martensitic stainless steel for motorcycle disc brakes containing Ni: 0.6% or less and N: 0.07% or less and consisting of the remaining Fe and other unavoidable elements are controlled using the following hardness prediction equation. It is an object of the present invention to provide a method for producing a low-hardness martensitic stainless steel, which is subjected to quenching and heat treatment.
H = -1846.44 + 3.91161 x Temp(℃) + 0.109271 x Time(sec) - 0.00203870 x Temp(℃) x Temp(℃)H = -1846.44 + 3.91161 x Temp (℃) + 0.109271 x Time (sec)-0.00203870 x Temp (℃) x Temp (℃)
저경도, 마르텐사이트계, 스테인레스강, 소입 열처리, 디스크 브레이크 Low Hardness, Martensitic, Stainless Steel, Hardened Heat Treatment, Disc Brake
Description
도 1은 본 발명에 의한 소입 열처리 조건에 따른 경도의 예측치를 나타낸다.1 shows the predicted hardness according to the hardening heat treatment conditions according to the present invention.
도 2는 본 발명에 있어서, 온도와 시간에 따른 경도의 등고선표이다.2 is a contour table of hardness according to temperature and time in the present invention.
본 발명은 저경도 마르텐사이트계 스테인레스강의 제조방법에 관한 것으로, 더욱 상세하게는 오토바이 디스크 브레이크 등에 이용되는 저경도 마르텐사이트계 스테인레스강의 목표 경도를 확보하기 위한 소입 열처리 조건을 한정한 저경도 마르텐사이트계 스테인레스강의 제조방법에 관한 것이다.The present invention relates to a method for producing low hardness martensitic stainless steel, and more particularly, to low hardness martensite based on hardening heat treatment conditions for securing a target hardness of low hardness martensitic stainless steel used for motorcycle disc brakes and the like. It relates to a method for producing stainless steel.
스테인레스강의 기본 강종 중의 하나인 마르텐사이트계 스테인레스강은 고온에서는 안정한 오스테나이트 조직이나, 공냉 또는 유냉에 의하여 마르텐사이트 변태를 일으켜 상온에서는 강자성의 마르텐사이트 조직을 갖게 된다. 통상의 생산 공정에서는 열처리를 통하여 가공이 용이하도록 페라이트와 탄화물의 혼합 조직으로 조업 및 관리되며 최종 제품으로 제조될 때 오스테나이트 영역에서 유지하여 탄 화물을 재고용하고 이후 급속 냉각에 의해 경도가 높은 마르텐사이트 조직으로 제조된다. 이때 최종 제품의 경도는 기본적으로 합금성분과 오스테나이트 영역에서의 열처리 조건인 온도와 시간에 의해 결정된다. Martensitic stainless steel, which is one of the basic steel grades of stainless steel, has a stable austenitic structure at high temperature, or martensite transformation by air cooling or oil cooling, and has a ferromagnetic martensite structure at room temperature. In the normal production process, it is operated and managed with a mixed structure of ferrite and carbide to facilitate processing through heat treatment, and retained in the austenite zone when the final product is manufactured, re-carbides the carbide and then hardens it by rapid cooling. It is made of tissue. In this case, the hardness of the final product is basically determined by temperature and time, which are heat treatment conditions in the alloying component and the austenitic region.
오토바이 디스크 브레이크용 마르텐사이트계 스테인레스강은 그 사용 목적상 HRc로 30~40의 소입 경도를 요구한다. 이러한 경도를 만족시키기 위하여 다양한 온도와 시간의 조합이 가능한데 통상의 경우에는 한정된 실험에 의하여 단속적인 열처리 조건을 도출하기 때문에 목표 경도의 변화나 조업 조건의 변동에 따라 열처리 조건을 설정하기 위한 추가적인 열처리 실험이 필요하게 된다. Martensitic stainless steels for motorcycle disc brakes require a hardening hardness of 30 to 40 for HRc. In order to satisfy the hardness, various combinations of temperature and time are possible. In general, since the intermittent heat treatment conditions are derived by a limited experiment, an additional heat treatment experiment for setting the heat treatment conditions according to the change of the target hardness or the change of the operating conditions This is necessary.
본 발명은 상기된 바와 같은 요망에 의하여 안출된 것으로 목표로 하는 경도를 추가적인 열처리 실험없이 용이하게 변경할 수 있는 열처리 조건을 제시할 수 있는 저경도 마르텐사이트계 스테인레스강의 제조방법을 제공하는 것을 목적으로 한다. It is an object of the present invention to provide a method for producing a low hardness martensitic stainless steel that can be proposed in accordance with the above-described requirements and can provide heat treatment conditions that can easily change the target hardness without additional heat treatment experiments. .
본 발명은 상기의 목적을 달성하기 위하여, 중량%로 Cr: 10.5~14.5%, C: 0.02~0.10%, Si: 0.2~0.6%, Cu: 0.2~0.5%, Mn: 0.5% 이하, P:0.04%이하, S:0.03% 이하, Ni: 0.6% 이하, N: 0.07% 이하를 함유하고 나머지 Fe 와 기타 불가피한 원소로 이루어지는 오토바이 디스크 브레이크용 스테인레스강을 소입 열처리 함에 있어 H = -1846.44 + 3.91161 x Temp(℃) + 0.109271 x Time(sec) - 0.00203870 x Temp(℃) x Temp(℃)로 표시되는 경도 예측식의 값이 30 내지 40의 값을 갖도록 열처리 온도와 유지 시간을 조절하여 소입 열처리하는 방법을 요지로 한다. In order to achieve the above object, the present invention provides Cr: 10.5 to 14.5%, C: 0.02 to 0.10%, Si: 0.2 to 0.6%, Cu: 0.2 to 0.5%, Mn: 0.5% or less, and P: H = -1846.44 + 3.91161 x for hardening heat treatment of stainless steel for motorcycle disc brakes containing 0.04% or less, S: 0.03% or less, Ni: 0.6% or less, N: 0.07% or less, and the remaining Fe and other unavoidable elements Annealing heat treatment is performed by adjusting the heat treatment temperature and holding time so that the value of the hardness prediction equation expressed as Temp (℃) + 0.109271 x Time (sec)-0.00203870 x Temp (℃) x Temp (℃) has a value of 30 to 40. The point is how.
본 발명에서 상기 경도는 로크웰 C로 측정한 경도값으로 한다.In the present invention, the hardness is a hardness value measured by Rockwell C.
이하 본 발명은 더욱 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명자는 저경도 마르텐사이트계 스테인레스강의 열처리 온도와 유지 시간이 소입 경도에 미치는 영향을 연구하면서, 열처리 온도 및 유지 시간과 소입 경도의 관계식을 도출하여 목표 경도를 확보할 수 있는 열처리 조건을 조업 조건에 따라 용이하게 설정할 수 있게 하였다. The present inventors studied the effects of the heat treatment temperature and the holding time on the quench hardness of the low-hardness martensitic stainless steel, while deriving the relational expression between the heat treatment temperature and the holding time and the quenching hardness, and operating conditions for obtaining the target hardness. It can be set easily according to.
이하 본 발명의 특징을 작용과 함께 설명한다. 우선 본 발명에서 필수성분을 한정한 이유를 설명한다. 이하 중량%로 나타낸다.Hereinafter, the features of the present invention will be described together with the functions. First, the reason for limiting the essential components in the present invention will be described. It is shown below in weight%.
C : 소입 열처리에 의해 경도를 확보하기 위하여 필요한 원소로 0.02% 이상 첨가되어야 하며, 0.10% 초과하여 과다 첨가될 경우에는 필요한 경도를 초과하며 내식성을 저하시키므로 0.02%~0.10%로 한정하였다. C: It should be added at least 0.02% as an element necessary to secure hardness by hardening heat treatment, and if it is added in excess of 0.10%, it exceeds the required hardness and lowers the corrosion resistance, so it was limited to 0.02% to 0.10%.
Si : 제강공정에서 탈산 및 주조 시의 유동성을 향상시키는 효과가 있는 원소로 최대 첨가량은 0.6% 이고 내식성을 향상시키며 용강중 산소 농도를 저감하기 위한 최저 첨가량은 0.2% 이다.Si: It is an element that has the effect of improving the fluidity during deoxidation and casting in steelmaking process. The maximum amount is 0.6% and the minimum amount is 0.2% to improve the corrosion resistance and reduce the oxygen concentration in molten steel.
Mn : 망간은 제강 원료인 스크랩에서 0.1~0.2% 정도 혼입되며 강중에 포함된 황과 결합하여 MnS를 형성하고 이러한 개재물은 내식성을 저하한다. 또한 망간의 첨가량이 높을 경우 소재의 인성을 저하시킨다. 또한 망간의 첨가량이 높을 경 우 제조 공정 중의 산세성이 떨어져서 비용 증가의 요인이 되므로 0.5% 이하로 첨가량을 제한하였다.Mn: Manganese is mixed in about 0.1 ~ 0.2% of steel scrap, which is combined with sulfur in steel to form MnS. These inclusions reduce corrosion resistance. In addition, when the amount of manganese is high, the toughness of the material is lowered. In addition, when the amount of added manganese is high, the pickling in the manufacturing process is lowered, causing a cost increase, so the amount added is limited to 0.5% or less.
P : 인은 첨가량이 많을수록 인성이 저하되므로 가능한 낮게 관리하는 것이 바람직하나 통상적인 방법으로 제조가 가능하고 인성이 문제되지 않는 범위인 0.04% 이하로 한정하였다.P: Since phosphorus decreases in toughness as the addition amount increases, it is preferable to manage it as low as possible, but it is limited to 0.04% or less which is a range which can be manufactured by a conventional method and toughness does not matter.
S : MnS와 같은 비금속 개재물을 형성하여 내식성을 저하시키고 표면 품질 및 가공성을 해치므로 가능한 낮게 관리하는 것이 바람직하나 특수한 정련법을 사용하지 않고 낮출 수 있는 범위인 0.03% 이하로 한정하였다.S: It is preferable to manage as low as possible because it forms non-metallic inclusions such as MnS, which lowers the corrosion resistance and damages the surface quality and workability, but it is limited to 0.03% or less, which can be lowered without using a special refining method.
Ni : 망간과 마찬가지로 소입 경도를 증가시키고 소입열처리 온도 영역을 확장시키는 원소이나 매우 고가이므로 제조비용을 고려하여 원료로 장입되는 스크랩에 의해 통상적으로 첨가되는 범위인 0.6% 이하로 제한한다.Ni: Like manganese, it is an element that increases the quench hardness and expands the quenching heat treatment temperature range, and is very expensive, so it is limited to 0.6% or less, which is a range normally added by scraps charged as raw materials in consideration of manufacturing cost.
Cr : 크롬은 부동태 피막 형성 원소로서 첨가량이 10.5% 미만일 겨우 내식성을 확보할 수 없다. 크롬의 함량이 높을수록 내식성은 향상되나 제조비용을 고려하여 그 첨가량을 14.5% 이하로 한정한다.Cr: Chromium is a passivation film-forming element and can not secure corrosion resistance only when the added amount is less than 10.5%. The higher the content of chromium, the better the corrosion resistance, but considering the manufacturing cost, the amount of addition is limited to 14.5% or less.
Cu : 구리는 망간과 같이 소입 경도를 증가시키고 소입 온도 영역을 확대시키는 원소로 첨가된다. 본 발명에서는 망간의 첨가량을 0.5%로 한정하였기 때문에 최소한 0.2% 이상 첨가하는 것으로 하였으며 0.6% 이상 첨가시에는 열간 가공성을 해치므로 0.2~0.5%로 제한하였다.Cu: Copper, like manganese, is added as an element that increases the quench hardness and enlarges the quenching temperature range. In the present invention, since the amount of manganese is limited to 0.5%, at least 0.2% or more is added. When 0.6% or more is added, the hot workability is impaired, so it is limited to 0.2 to 0.5%.
N : 소입 경도를 증가시키고 소입 온도 영역을 확대시키며 마르텐사이트 경도를 높이는 원소이다. 그러나 0.07% 초과하여 함유되면 질화물을 석출시켜 크롬 고용량을 저하시키고 내식성을 해치므로 0.07% 이하로 제한한다. N: An element that increases the quench hardness, enlarges the quench temperature range and increases the martensite hardness. However, if the content is more than 0.07%, the nitride is precipitated, thereby lowering the high chromium capacity and damaging the corrosion resistance, so it is limited to 0.07% or less.
(실시예)(Example)
이하 본 발명의 실시예를 설명한다.Hereinafter, embodiments of the present invention will be described.
하기 표 1은 소입 열처리 실험에 사용된 합금의 조성이다.Table 1 below shows the composition of the alloy used in the hardening heat treatment experiment.
상기 표 1의 강재의 소입 열처리 온도와 유지 시간의 영향을 통계적으로 분석하기 위하여 반응표면 분석법의 중심복합 설계를 사용하여 열처리 조건을 표 2와 같이 설계하였다.In order to statistically analyze the effects of the quenching heat treatment temperature and the holding time of the steel of Table 1, the heat treatment conditions were designed as shown in Table 2 using the central complex design of the reaction surface analysis method.
하기 표 2는 본 발명과 비교예에 관한 열처리 조건을 나타낸다.Table 2 below shows the heat treatment conditions according to the present invention and the comparative examples.
표 1의 강재를 표 2의 조건으로 열처리 한 후 측정한 로크웰 C 경도값을 표 3 에 정리하였다. 측정결과를 반응 표면 분석법에 의해 분석하여 구한 경도 (HRc)의 예측식인 하기 식으로 부터 계산한 경도의 예측치를 표 3에 함께 정리하였다. Table 3 shows the Rockwell C hardness values measured after the steel materials in Table 1 were heat treated under the conditions in Table 2. The estimated values of the hardness calculated from the following formula, which is a prediction formula of hardness (HRc) obtained by analyzing the measurement results by the response surface analysis method, are summarized together in Table 3.
H = -1846.44 + 3.91161 x Temp(℃) + 0.109271 x Time(sec) - 0.00203870 x Temp(℃) x Temp(℃)H = -1846.44 + 3.91161 x Temp (℃) + 0.109271 x Time (sec)-0.00203870 x Temp (℃) x Temp (℃)
상기 표 3은 본 발명예와 비교예의 경도값을 비교한 것이다. 표 3에서의 실측경도와 계산에 의해 예측한 경도를 비교하여 도 1에 정리하였다. 도 1은 본 발명에 의한 소입 열처리 조건에 따른 경도의 예측치를 나타낸다. 도면에서 알 수 있는 바와 같이, 본 발명에 의하여 계산된 경도값은 측정경도값과 대략적으로 일치하는 것을 알 수 있다. Table 3 compares the hardness values of the present invention and the comparative example. The measured hardness in Table 3 was compared with the hardness predicted by calculation, and it was put together in FIG. 1 shows the predicted hardness according to the hardening heat treatment conditions according to the present invention. As can be seen from the figure, it can be seen that the hardness value calculated by the present invention is approximately equal to the measured hardness value.
도 2는 본 발명에 있어서 열처리 조건에 따라 계산식으로 구한 동일한 경도값을 연결한 선이다. 도면에서 알 수 있는 봐와 같이, 시간과 온도에 따라 구해진 측정된 경도값이 30 내지 40의 범위에 있도록 열처리 온도와 시간을 제어하는 것이 중요하다.Figure 2 is a line connecting the same hardness value obtained by the formula according to the heat treatment conditions in the present invention. As can be seen from the figure, it is important to control the heat treatment temperature and time so that the measured hardness value obtained according to time and temperature is in the range of 30 to 40.
상술한 바와 같이, 본 발명에 의하면, 적정의 소입 경도를 확보하기 위한 소입 열처리 온도와 시간을 조합한 열처리 조건을 수식에 의해 용이하게 도출할 수 있다. As mentioned above, according to this invention, the heat processing conditions which combined the hardening heat processing temperature and time for ensuring the appropriate hardening hardness can be derived easily by a formula.
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| KR101326800B1 (en) * | 2011-12-20 | 2013-11-11 | 지영준 | High strength free cutting stainless steel |
| WO2014123229A1 (en) * | 2013-02-08 | 2014-08-14 | 新日鐵住金ステンレス株式会社 | Stainless steel brake disc and method for manufacturing same |
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