KR900001098B1 - Carbon steel having a property of high hardening - Google Patents
Carbon steel having a property of high hardening Download PDFInfo
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- KR900001098B1 KR900001098B1 KR1019850008534A KR850008534A KR900001098B1 KR 900001098 B1 KR900001098 B1 KR 900001098B1 KR 1019850008534 A KR1019850008534 A KR 1019850008534A KR 850008534 A KR850008534 A KR 850008534A KR 900001098 B1 KR900001098 B1 KR 900001098B1
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- carbon steel
- hardenability
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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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- Heat Treatment Of Steel (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
Description
도면은 본 발명에 의한 합금과 비교합금간의 펄라이트 성장속도 비교도.Figure is a comparison of pearlite growth rate between the alloy and the comparative alloy according to the present invention.
본 발명은 경화능이 우수한 탄소강, 특히 탄소함량, 0.8% 전후로 갖는 공석강에 합금원소를 미량 첨가하여 펄라이트의 성장속도를 현저하게 감소시키므로써 우수한 경화능을 부여한 탄소강에 관한 것이다.The present invention relates to carbon steel having excellent hardenability, in particular, carbon content, and carbon steel having excellent hardenability by providing a small amount of alloying elements to the vacancy steel having about 0.8%.
일반적으로 탄소함량 0.8% 전후로 갖는 공석강에 열처리시의 경화능 즉 소입성을 향상시키기 위해 재료의 고유특성을 변화시키지 않는 범위내에서 합금원소를 첨가하여 탄소강의 경화능을 향상시킨다.Generally, in order to improve the hardenability during heat treatment, that is, hardenability during heat treatment, to an vacant steel having a carbon content of about 0.8%, an alloying element is added within the range of not changing the intrinsic properties of the material to improve the hardenability of the carbon steel.
종래에는 Co를 제외한 합금원소의 첨가로써 펄라이트의 성장속도를 감소시켜 경화능을 좋게하나, 경화능 향상을 위해 첨가하는 원소에 의해 재료의 고유특성이 변화하거나 열처리작업이 까다로워지는 한편 고가의 첨가원소에 의해 재료가격이 올라가는 경우가 많았다.Conventionally, the addition of alloying elements other than Co reduces the growth rate of pearlite to improve the hardenability, but the intrinsic properties of the material are changed or the heat treatment is difficult due to the elements added to improve the hardenability, while expensive additive elements are added. In many cases, material prices have increased.
본 발명은 이러한 종래결점을 개선하여 미량의 합금원소를 첨가하므로써 우수한 경화능을 갖는 탄소강을 제조한 것으로 일반적으로 첨가되는 Mo, Cr의 양보다 훨씬 적은양으로 서로 상승작용을 일으켜 경화능을 향상시킬 수 있도록, Si를 함게 첨가한 것으로 본 발명을 상세히 설명하면 다음과 같다.The present invention is to produce a carbon steel having excellent hardening ability by adding a small amount of alloying elements to improve the conventional defects to improve the hardenability by synergizing with each other in much less than the amount of Mo, Cr generally added In order to enable the present invention to be described in detail with addition of Si as follows.
본 발명의 탄소강은 0.8% 전후의 탄소를 함유한 공석강에 Mo 0.1∼0.25%, Cr 0.4∼0.6%, Si 0.4∼0.6%를 첨가하여 되어진다. Si는 Mo, Cr 등에 형성된 탄화물이 상경계에 편석되어 탄소가 상경계를 통한 빠른 확산을 하지 못하고 체적확산을 하게 하므로써 펄라이트 성장속도를 감소시키게 하는 작용을 상승시키는 역할을 하게된다. Mo는 탄소와 Mo2C의 형태로 결합하여 상경계에 모임으로써 탄소의 상경계 확산을 체적확산으로 바뀌게 하며, 0.1∼0.25%가 가장 적절하다. Cr은 Cr7C3, Cr23C6, (Fe Cr)3C의 형태로 결합하여 상경계에 모임으로써 탄소의 상경계확산을 체적확산을 바뀌게 하며 0.1∼0.25%가 가장 적절하다.In the carbon steel of the present invention, 0.1 to 0.25% of Mo, 0.4 to 0.6% of Cr, and 0.4 to 0.6% of Si are added to the vacancy steel containing about 0.8% of carbon. Si plays a role of increasing the action of reducing the growth rate of pearlite by allowing carbides formed in Mo, Cr, etc. to segregate in the upper boundary so that carbon does not diffuse rapidly through the upper boundary and thus volume diffusion. Mo combines with carbon in the form of Mo 2 C and gathers at the upper boundary to convert the diffusion of carbon to volume diffusion, with 0.1 to 0.25% being most appropriate. Cr combines in the form of Cr 7 C 3 , Cr 23 C 6 , (Fe Cr) 3 C, and gathers in the phase boundary to change the volume diffusion of carbon phase boundary, and 0.1 to 0.25% is most appropriate.
Si는 Mo, Cr등과 상승작용을 일으켜 경화능을 더욱 증가시키게 하기 위하여 0.4∼0.6%의 범위가 가장 적당하다.Si is most suitably in the range of 0.4 to 0.6% in order to cause synergy with Mo, Cr and the like to further increase the hardenability.
[실시예]EXAMPLE
하기 제1표에 본 발명 첨가합금원소의 실시예 및 비교예의 조성(중량%)를 표시하였다. 사용공석강은 탄소함량이 0.8%인 것을 사용하였다.The composition (weight%) of the Example and comparative example of this invention addition alloy element is shown to the following 1st table | surface. As a vacant steel, a carbon content of 0.8% was used.
[표 1]TABLE 1
본 발명 합금과 비교합금의 조성물Composition of the Alloy and Comparative Alloy of the Invention
상기한 제1표에 표시된 합금에 대해 표면을 관찰할 수 있도록 연마와 에칭을 실시한 후 각각 고온 현미경에 800℃로 1시간 유지한 후 공정점으로부터 Under cooling 하여 시간이 경과됨에 따라 펄라이트가 성장하는 길이를 단위시간(sec)으로 환산하여 성장속도를 산출하였다. 그 결과는 도면에 나타난 바와 같은 경향을 얻을 수있었다. 이 도면에서 알 수 있는 바와 같이 본 발명에서 제작된 합금이 비교합금에 비해 성장속도가 현저하게 감소하고 있다. 그리고 탄소강에 있어서 경화능은 펄라이틀의 성장이 적고 오스테나이트상이 많은 경우에 오스테나이트상이 마르텐사이트상으로 상변태를 진행시킴에 따라 경화능이 우수하게 된다.After polishing and etching the alloys listed in Table 1 above to maintain the surface at 800 ° C for 1 hour in a high-temperature microscope, and then under cooling from the process point to grow the pearlite over time. The growth rate was calculated by converting to unit time (sec). The result was a trend as shown in the figure. As can be seen from this figure, the alloy produced in the present invention is significantly reduced in growth rate compared to the comparative alloy. The hardenability in carbon steel is excellent in the hardenability as the austenite phase undergoes a phase transformation into a martensite phase when the pearlite has little growth and the austenite phase is large.
따라서 본 발명에서 제조한 합금은 비교예에서 나타낸 합금에 비해 경화능이 현저하게 향상되어짐을 알 수 있다.Therefore, it can be seen that the alloy prepared in the present invention is significantly improved in hardenability compared to the alloy shown in the comparative example.
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KR1019850008534A KR900001098B1 (en) | 1985-11-14 | 1985-11-14 | Carbon steel having a property of high hardening |
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KR1019850008534A KR900001098B1 (en) | 1985-11-14 | 1985-11-14 | Carbon steel having a property of high hardening |
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KR900001098B1 true KR900001098B1 (en) | 1990-02-26 |
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