KR890001014B1 - Cast steel having high tension and resistant wear - Google Patents
Cast steel having high tension and resistant wear Download PDFInfo
- Publication number
- KR890001014B1 KR890001014B1 KR1019840005221A KR840005221A KR890001014B1 KR 890001014 B1 KR890001014 B1 KR 890001014B1 KR 1019840005221 A KR1019840005221 A KR 1019840005221A KR 840005221 A KR840005221 A KR 840005221A KR 890001014 B1 KR890001014 B1 KR 890001014B1
- Authority
- KR
- South Korea
- Prior art keywords
- cast steel
- hours
- heat treatment
- present
- high tension
- Prior art date
Links
Classifications
-
- 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
Description
본 발명은 저합금강중에 특히 용접성을 갖는 주강 주조재에 관한 것이다.FIELD OF THE INVENTION The present invention relates to cast steel castings which are particularly weldable in low alloy steels.
종래의 저합금용 주강주조 제품은 그 생산시에 인장력을 증가시키기 위한 성분을 조절하거나 그 화학적 성분의 규제사항이 마련되어 있지 않으며 기계적 성질이 175PSI(120kg/㎟)이상인 것은 규격조차 없었다.Conventional cast steel casting products for low alloys do not have a regulation to increase the tensile force at the time of production, or the regulation of the chemical composition is not provided, and the mechanical properties are not even the specification of more than 175PSI (120kg / ㎜).
따라서 저합금용 주강주조 제품은 각 메이커 마다 독자적인 자체 사양으로 생산 사용하여 왔으나 용접성이 저하되고 담금질(Quenching), 뜨임(Tempering), 시에 크랙 (Crack)이 빈번히 발생되는 문제점이 있었다.Therefore, cast steel casting products for low alloys have been produced and used in their own specifications for each manufacturer, but there is a problem in that weldability is degraded and quenching, tempering, and cracking occur frequently.
본 발명은 이와 같은 문제점을 해결하기 위하여 일반적인 저합금강과는 상이한 화학 조성비와 열처리 방법으로 종래의 것보다 내마모성이 뛰어나면서도 용접성이 우수한 고장력 내마모 주강 주조제를 제공하기 위한 것이다.The present invention is to provide a high-strength wear-resistant cast steel casting excellent in wear resistance and excellent weldability than the conventional one in the chemical composition ratio and heat treatment method different from the general low alloy steel in order to solve such problems.
이하 본 발명을 더욱 구체화 시키기 위해서 본 발명과 종래의 주강 주조재 성분 조성비 및 열처리 방법을 비교해 보면 다음과 같다.In order to further refine the present invention, the present invention and the conventional cast steel component composition ratio and heat treatment method are as follows.
1) 성분 조성비 비교표(1)1) Component composition ratio comparison table (1)
2) 열처리 방법 비교표(2)2) Heat treatment method comparison table (2)
이상의 도표에서 비교해 본 바와 같이 본 발명은 일반 탄소강에 크롬(Cr)을 1.5-2.0%로 첨가하여 오오스테나이트(Austenite) 결정입자의 성장을 방지시켜 소입성을 증가시켰고, 또한 실리콘(Si)을 1.5-2.0%, 망간(Mn)을 1.0-1.5%, 바나듐(V)을 소량 첨가시켜 더욱 소입성을 증대시켰다.As compared with the above diagram, the present invention added chromium (Cr) to general carbon steel by 1.5-2.0% to prevent the growth of austenite crystal grains, thereby increasing the hardenability, and also adding silicon (Si). 1.5-2.0%, manganese (Mn) 1.0-1.5%, and a small amount of vanadium (V) was added to further increase the hardenability.
그리고 크롬(Cr)과 탄소(C)가 반응하여 입계에 편석을 하는 크롬 탄화물 (Cr4C)로 인한 용접성의 저하와 소려 취성문제를 해결코저 종래에는 첨가되지 않았던 몰리브덴(Mo)을 0.1-0.8% 첨가시켜 해결하였으며, 특히 저온에서 강인성을 부여하는 니켈(Ni)를 0.5-0.8% 첨가시켜 용접성을 더욱 향상시킬 수 있었다.In addition, 0.1-0.8% of molybdenum (Mo), which has not been added conventionally, is solved to solve the problem of deterioration of weldability and concern brittleness caused by chromium carbide (Cr4C), which is segregated at grain boundaries due to the reaction of chromium (Cr) and carbon (C). In order to solve the problem, the weldability was further improved by adding 0.5-0.8% nickel (Ni), which gives toughness at low temperature.
열처리 방법에서도 상기 도표에서 보는 바와 같이 종래에는 850℃에서 약 40분 동안 물로 담금질(QUENCHING) 처리하고 다시 430℃에서 90분 동안 뜨임 (TEM PERING) 처리하였으나 본 발명은 뜨임처리시 소려 취성의 범위가 저실리콘 (LOW Silicon)의 저합금강에서는 250-430℃에 존재한다는 일반적인 개념과는 달리 실리콘 (Si)양이 증가하면 소려 취성의 온도도 상승하므로 실리콘(Si)양을 1.5-2.0%의 경우에는 소려 취성의 온도구역이 430℃-540℃로 상승하므로 본 발명은 고장력 특수강을 얻기 위하여 소려온도를 350-460℃에서 2시간동안 물로 뜨림 처리하고 담금질시에는 850℃에서 1시간동안 물로 처리한다.In the heat treatment method, as shown in the above diagram, conventionally, it was quenched with water at 850 ° C. for about 40 minutes and tempered again at 430 ° C. for 90 minutes, but the present invention has a range of brittleness during tempering. Contrary to the general concept that the low alloy steel of low silicon exists at 250-430 ° C, when the amount of silicon (Si) is increased, the brittle temperature also increases, so the amount of silicon (Si) is 1.5-2.0%. Since the sour brittle temperature zone rises to 430 ° C.-540 ° C., the present invention is treated with water for 2 hours at 350-460 ° C. and quenched with water at 850 ° C. for 1 hour when quenched to obtain high tensile strength steel.
이상과 같이 탄소(C)양을 규격치의 하한치로 내리거나 열처리중 소려 온도를 350℃-460℃이상이나 이하로 조절할 경우 인장력의 감소현상을 가져오게 되므로 140kg/㎟-170kg/㎟의 인장력을 요구하는 어떠한 고장력 내마모용 주강재 주조품을 생산하고져할때 본 발명을 적용할 수 있는 것으로서 이하 본 발명의 적용실시예를 설명하면 다음과 같다.As described above, if the amount of carbon (C) is lowered to the lower limit of the standard value or if the temperature during heat treatment is adjusted to 350 ° C-460 ° C or higher, the tensile force will be reduced, so a tensile force of 140kg / mm2-170kg / mm2 is required. When the present invention can be applied to produce any high-tensile wear-resistant cast steel cast article as follows will be described an application example of the present invention.
본 발명의 성분 조성비 비교표(1)에 따라 목표재질을 120kg/㎟급과 160kg/㎟급으로 나누어 각각의 성분 조성비에 따른 기계적 성질을 실시예로 분석해 보면 다음과 같다.According to the component composition ratio comparison table (1) of the present invention, the target material is divided into 120 kg / mm 2 class and 160 kg / mm 2 class.
[실시예 (1)][Example (1)]
먼저 120kg/㎟급의 경우First, in case of 120kg / mm2
실시예 성분 조성비표(3)Example Component Composition Ratio Table (3)
위와 같이 화학조성비를 목표 성분내에서 유도로를 이용하여 실제치와 같이 배합해서 얻은 테스트 쿠폰(TEST coupon) ASTMA 370더블킬 블록(Double Keel Block)에 각각 다른 열처리 조건을 부여하여 이에 따른 기계적 성질을 비교해 보면 다음 도표와 같다.As above, different heat treatment conditions were given to the test coupon ASTMA 370 Double Keel Block obtained by combining the chemical composition ratio with the actual value using the induction furnace in the target component, and comparing the mechanical properties accordingly. See the following chart.
열처리 조건에 따른 기계적 성질 비교표 4Table 4 Comparison of Mechanical Properties According to Heat Treatment Conditions
이상에서 보는 바와 같이 시험해 본 결과 본 발명에서 요구하는 기계적 성질에 부합되는 열처리 조건이 뜨임온도 350℃-400℃가 되므로 재질의 배합 성분을 실시예 성분 조성비표(3)의 목표 성분으로 하고 열처리를 주조시에는 920℃에서 3시간동안 폴림하고 618℃에서 3시간 뜨임 처리하고, 또한 850℃에서 1시간동안 물담금질 (WATER Quenching)을 실시하고 460℃에서 2시간동안 물 뜨임처리 (WATER Tempering)을 실시해야 한다는 것을 알 수 있다.As a result of the test as described above, the heat treatment condition that meets the mechanical properties required by the present invention becomes the tempering temperature 350 ℃-400 ℃, so that the heat treatment is carried out with the blending component of the material as the target component of the Example ingredient composition ratio table (3) In casting, pollination at 920 ° C for 3 hours, tempering at 618 ° C for 3 hours, water quenching at 850 ° C for 1 hour, and water tempering at 460 ° C for 2 hours It can be seen that it should be done.
[실시예 (2)][Example (2)]
160kg/㎟급의 경우In case of 160kg / mm2 class
실시예 성분 조성비표(5)Example Component Composition Ratio Table (5)
이와 같이 목표 성분내에서 유도로를 이용하여 두차례에 걸쳐 1차 실제치와 2차 실제치와 같이 성분을 배합하여 얻은 테스트 쿠폰(ASTM A370)더블 킬블록(Double Keel Block)에 각각 다른 열처리 조건을 부여하여 이에 따른 기계적 성질을 비교해 보면 다음 도표와 같다.In this way, different heat treatment conditions are applied to the test coupon (ASTM A370) double keel block obtained by combining the components such as the first actual value and the second actual value two times using an induction furnace in the target component. As a result, the mechanical properties are compared.
이때 2차 실제치의 성분 배합에서는 탄소량(C)을 상향 조정하여 뜨임처리 조건을 350℃로 고정하여 시험한 것이다.At this time, in the component combination of the second actual value, the carbon amount (C) was adjusted upward, and the tempering treatment condition was fixed at 350 ° C and tested.
1차 실제치의 경우1st actual value
열처리 조건에 따른 기계적 성질 비교표 6Table 6 Comparison of Mechanical Properties According to Heat Treatment Conditions
2차 실제치의 경우2nd actual value
열처리 조건에 따른 기계적 성질 비교표(7)Comparative Table of Mechanical Properties According to Heat Treatment Condition (7)
이상에서 보는 바와 같이 본 발명의 실시결과에 의하면 350℃-400℃에서 뜨임 처리한 기계적 성질의 결과치가 200℃에서 처리한 결과치보다 높게 나타나며 실리콘 (Si)양이 증가하면 소려 취성온도(Embrittling Tempering Temperatare)도 높은 온도로 변경됨을 알 수 있다.As described above, according to the results of the present invention, the result of the mechanical properties tempered at 350 ° C.-400 ° C. is higher than the result obtained at 200 ° C., and when the amount of silicon (Si) is increased, the brittle temperature (Embrittling Tempering Temperatare) is increased. ) Is also changed to a high temperature.
이와 같이 하여 본 발명은 종래의 일반 저합금용 주강 주조제에 비하여 약 2배 이상의 내마모성을 갖게 될 뿐만 아니라 용접성이 향상되고 담금질시나 또는 임시에 발생하는 크랙현상을 방지할 수 있게 되는 효과를 얻을 수 있는 것이다.In this way, the present invention not only has a wear resistance of about twice or more than that of a conventional low alloy cast steel casting, but also improves weldability and prevents cracking occurring during quenching or temporary. It is.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019840005221A KR890001014B1 (en) | 1984-08-27 | 1984-08-27 | Cast steel having high tension and resistant wear |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1019840005221A KR890001014B1 (en) | 1984-08-27 | 1984-08-27 | Cast steel having high tension and resistant wear |
Publications (2)
Publication Number | Publication Date |
---|---|
KR860001895A KR860001895A (en) | 1986-03-24 |
KR890001014B1 true KR890001014B1 (en) | 1989-04-18 |
Family
ID=19235192
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1019840005221A KR890001014B1 (en) | 1984-08-27 | 1984-08-27 | Cast steel having high tension and resistant wear |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR890001014B1 (en) |
-
1984
- 1984-08-27 KR KR1019840005221A patent/KR890001014B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR860001895A (en) | 1986-03-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU2013299254B2 (en) | Ultrahigh-strength, high-toughness, wear-resistant steel plate and manufacturing method thereof | |
AU2013221988B2 (en) | Abrasion resistant steel plate with high strength and high toughness, and processing for preparing same | |
AU2013222054B2 (en) | Abrasion resistant steel plate with high strength and high toughness, and processing for preparing the same | |
US20150252457A1 (en) | Method for producing molten steel having high wear resistance and steel having said characteristics | |
JPH07238350A (en) | Surface-carburized stainless steel alloy for high-temperature use, article produced from it, and its production | |
CN109642298B (en) | Precipitation hardening stainless steel and its manufacture | |
US5565044A (en) | Thermal refiningless hot-rolled steel and method of making same | |
US4157258A (en) | Case-hardening alloy steel and case-hardened article made therefrom | |
JPS6311423B2 (en) | ||
CN109790602B (en) | Steel | |
US3907553A (en) | High-carbon steel suitable for super high tensile strength hard drawn steel wire | |
US4395284A (en) | Abrasion resistant machinable white cast iron | |
KR930006298B1 (en) | Continuous cast steel | |
JPH073386A (en) | Non-refining steel for hot forging excellent in fatigue strength and production of non-refining hot forged product using the same steel | |
US4049430A (en) | Precipitation hardenable stainless steel | |
EP0498105B1 (en) | High strength and high toughness stainless steel and method of manufacturing the same | |
EP0272788A1 (en) | A method of making wear resistant gray cast iron | |
KR890001014B1 (en) | Cast steel having high tension and resistant wear | |
JPH07238343A (en) | Free cutting carburizing steel and heat treatment therefor before machining | |
US5951944A (en) | Lowly decarburizable spring steel | |
KR920010228B1 (en) | Making process for mooring chain steel having a good weldabilty | |
JPS6130653A (en) | High strength spring steel | |
JPH0379739A (en) | High strength and high toughness spheroidal graphite cast iron | |
JPH04228536A (en) | Steel excellent in wear resistance | |
JP2563164B2 (en) | High strength non-tempered tough steel |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
A201 | Request for examination | ||
E902 | Notification of reason for refusal | ||
G160 | Decision to publish patent application | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant | ||
LAPS | Lapse due to unpaid annual fee |