KR101819345B1 - 균열전파 저항성 및 연성이 우수한 열간성형 부재 및 이의 제조방법 - Google Patents
균열전파 저항성 및 연성이 우수한 열간성형 부재 및 이의 제조방법 Download PDFInfo
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Abstract
Description
도 2는 본 발명의 일 실시예에 따른 발명예와 비교예의 도금층 단면 측정 사진을 나타낸 것이다.
| 강종 | 합금성분 (중량%) | 구분 | ||||||||
| C | Si | Mn | P | S | Al | N | B | 기타 | ||
| A | 0.18 | 0.20 | 3.8 | 0.015 | 0.0030 | 0.03 | 0.0033 | 0 | 0 | 발명강 |
| B | 0.15 | 0.14 | 5.0 | 0.014 | 0.0025 | 0.03 | 0.0042 | 0 | Ti: 0.03 | 발명강 |
| C | 0.21 | 1.52 | 5.9 | 0.007 | 0.0011 | 0.02 | 0.0050 | 0.0035 | Ti: 0.04 | 발명강 |
| D | 0.20 | 0.15 | 6.7 | 0.009 | 0.0030 | 0.03 | 0.0050 | 0.0026 | 0 | 발명강 |
| E | 0.25 | 1.51 | 6.8 | 0.007 | 0.0015 | 0.01 | 0.0037 | 0 | Mo: 0.1 | 발명강 |
| F | 0.26 | 0.10 | 7.5 | 0.017 | 0.0018 | 0.008 | 0.0062 | 0.0032 | Ti: 0.02 | 발명강 |
| G | 0.23 | 0.20 | 1.2 | 0.014 | 0.0024 | 0.03 | 0.0038 | 0.0025 | Ti: 0.03 | 비교강 |
| 강종 | 도금 | 열간성형 조건 | 기계적 물성 | 잔류γ 분율 (%) |
PAGS (㎛) |
Mn/Zn 함량비 |
최대 균열 깊이 (㎛) |
구분 | ||||
| 가열 온도 (℃) |
유지 시간 (sec) |
냉각 속도 (℃/s) |
성형 온도 (℃) |
TS (Mpa) |
El (%) |
|||||||
| A-1 | GI | 800 | 60 | 10.3 | 620 | 1583 | 7.9 | 3.9 | 6.9 | 0.30 | 7.2 | 발명예 1 |
| A-2 | GI | 800 | 60 | 10.1 | 500 | 1547 | 7.2 | 3.3 | 6.8 | 0.32 | 3.5 | 발명예 2 |
| A-3 | GI | 800 | 60 | 31.5 | 500 | 1554 | 7.3 | 3.4 | 6.8 | 0.32 | 3.4 | 발명예 3 |
| A-4 | GA | 800 | 60 | 10.0 | 450 | 1490 | 8.3 | 3.4 | 6.2 | 0.31 | 0.0 | 발명예 4 |
| A-5 | EG | 800 | 60 | 9.7 | 400 | 1465 | 7.6 | 3.8 | 6.3 | 0.34 | 0.2 | 발명예 5 |
| A-6 | GI | 800 | 60 | 10.8 | 710 | 1662 | 7.8 | 3.1 | 6.3 | 0.28 | 22.3 | 비교예 1 |
| A-7 | GI | 800 | 6 | 10.5 | 690 | 1627 | 8.1 | 3.5 | 6.0 | 0.29 | 17.8 | 비교예 2 |
| A-8 | GI | 800 | 1 | 10.6 | 550 | 1592 | 7.8 | 3.5 | 6.2 | 0.09 | 10.6 | 비교예 3 |
| B-1 | GA | 800 | 60 | 10.3 | 500 | 1653 | 9.6 | 4.0 | 4.1 | 0.39 | 0.0 | 발명예 6 |
| C-1 | EG | 780 | 120 | 10.5 | 500 | 2035 | 7.9 | 5.7 | 2.8 | 0.52 | 0.0 | 발명예 7 |
| D-1 | GI | 780 | 120 | 10.3 | 500 | 2089 | 6.7 | 6.5 | 2.5 | 0.64 | 0.0 | 발명예 8 |
| E-1 | EG | 780 | 120 | 10.4 | 500 | 2231 | 6.6 | 7.1 | 2.3 | 0.67 | 0.0 | 발명예 9 |
| F-1 | GA | 750 | 60 | 10.2 | 500 | 2407 | 7.3 | 11.3 | 1.8 | 0.72 | 0.0 | 발명예 10 |
| G-1 | GI | 930 | 60 | 12.7 | 750 | 1539 | 6.6 | 0.3 | 12.7 | 0.07 | 28.5 | 비교예 4 |
| G-2 | GI | 930 | 60 | 11.5 | 550 | 631 | 18.2 | 0.1 | 12.5 | 0.05 | 10.3 | 비교예 5 |
| 강종 | 템퍼링 조건 | 기계적 물성 | 잔류γ 분율 (%) |
구분 | ||||
| 온도(℃) | 시간(sec) | YS(MPa) | TS(MPa) | El(%) | ||||
| A-3 | A-3-1 | 170 | 1800 | 1342 | 1581 | 9.4 | 4.3 | 발명예 11 |
| B-1 | B-1-1 | 170 | 1800 | 1311 | 1564 | 10.4 | 7.1 | 발명예 12 |
| C-1 | C-1-1 | 200 | 30 | 983 | 1931 | 10.5 | 6.4 | 발명예 13 |
| C-1-2 | 300 | 30 | 1260 | 1770 | 11.7 | 8.1 | 발명예 14 | |
| C-1-3 | 400 | 30 | 1383 | 1572 | 12.9 | 12.8 | 발명예 15 | |
| C-1-4 | 500 | 30 | 1400 | 1452 | 15.8 | 17.8 | 발명예 16 | |
| D-1 | D-1-1 | 200 | 30 | 989 | 1917 | 10.8 | 6.8 | 발명예 17 |
| D-1-2 | 300 | 30 | 1240 | 1730 | 11.2 | 7.5 | 발명예 18 | |
| D-1-3 | 400 | 30 | 1239 | 1569 | 13.7 | 14.9 | 발명예 19 | |
| D-1-4 | 500 | 30 | 1231 | 1435 | 15.6 | 17.2 | 발명예 20 | |
| D-1-5 | 600 | 30 | 1072 | 1279 | 18.4 | 19.8 | 발명예 21 | |
| E-1 | E-1-1 | 200 | 300 | 921 | 2052 | 11.9 | 7.8 | 발명예 22 |
| E-1-2 | 300 | 300 | 1147 | 1836 | 13.4 | 13.6 | 발명예 23 | |
| E-1-3 | 400 | 30 | 1244 | 1671 | 14.9 | 15.6 | 발명예 24 | |
| E-1-4 | 500 | 30 | 1351 | 1568 | 18.9 | 20.7 | 발명예 25 | |
| F-1 | F-1-1 | 500 | 30 | 1180 | 1423 | 12.6 | 23.9 | 발명예 26 |
| G-1 | G-1-1 | 200 | 1800 | 1162 | 1482 | 6.9 | 0.3 | 비교예 6 |
| G-1-2 | 250 | 1800 | 1154 | 1425 | 7.1 | 0.4 | 비교예 7 | |
| G-1-3 | 300 | 1800 | 1185 | 1351 | 3.1 | 0.5 | 비교예 8 | |
| G-1-4 | 400 | 1800 | 1060 | 1162 | 3.1 | 0.6 | 비교예 9 | |
| G-1-5 | 500 | 1800 | 842 | 903 | 9.1 | 0.9 | 비교예 10 | |
Claims (10)
- 중량%로, 탄소(C): 0.08~0.30%, 실리콘(Si): 0.01~2.0%, 망간(Mn): 3.8~8.0%, 알루미늄(Al): 0.001~0.5%, 인(P): 0.001~0.05%, 황(S): 0.0001~0.02%, 질소(N): 0.02% 이하, 잔부 Fe 및 기타 불순물을 포함하는 소지강판 및 상기 소지강판의 적어도 일면에 아연 또는 아연합금 도금층을 포함하는 열간성형 부재로서,
상기 열간성형 부재는 미세조직으로 1~30면적%의 잔류 오스테나이트를 포함하고, 상기 도금층 표층으로부터 두께 방향 0.5~1.2㎛의 산화층 내 Mn(중량%)/Zn(중량%)의 함량비가 0.1 이상이고, 균열전파 저항성 및 연성이 우수한 열간성형 부재.
- 제 1항에 있어서,
상기 소지강판은 다음의 (1) 내지 (4) 그룹 중에서 하나 이상의 그룹을 더 포함하는 균열전파 저항성 및 연성이 우수한 열간성형 부재.
(1) 크롬(Cr) 및 몰리브덴(Mo) 중 1종 이상을 함량 합으로 0.001~2.0%
(2) 티타늄(Ti), 니오븀(Nb) 및 바나듐(V) 중 1종 이상을 함량 합으로 0.001~0.2%
(3) 구리(Cu) 및 니켈(Ni) 중 1종 이상을 함량 합으로 0.005~2.0%
(4) 보론(B): 0.0001~0.01%
- 제 1항에 있어서,
상기 열간성형 부재는 잔부 미세조직으로 마르텐사이트 및 베이나이트 중 1종 이상을 포함하거나, 템퍼드 마르텐사이트 및 베이나이트 중 1종 이상을 포함하는 것인 균열전파 저항성 및 연성이 우수한 열간성형 부재.
- 제 1항에 있어서,
상기 열간성형 부재는 구 오스테나이트 입경이 10㎛ 이하인 균열전파 저항성 및 연성이 우수한 열간성형 부재.
- 중량%로, 탄소(C): 0.08~0.30%, 실리콘(Si): 0.01~2.0%, 망간(Mn): 3.8~8.0%, 알루미늄(Al): 0.001~0.5%, 인(P): 0.001~0.05%, 황(S): 0.0001~0.02%, 질소(N): 0.02% 이하, 잔부 Fe 및 기타 불순물을 포함하는 소지강판을 준비한 후 이를 아연 또는 아연합금 도금처리하여 도금강판을 제조하는 단계;
상기 도금강판을 가열로에 장입하여 1~1000℃/s의 승온속도로 Ac3 이상까지 가열한 후 5~10000초간 유지하는 단계;
상기 가열 및 유지된 도금강판을 가열로에서 추출하여 1℃/s 이상 50℃/s 미만의 평균냉각속도로 400~650℃까지 냉각한 후, 상기 온도에서 열간성형하는 단계; 및
상기 열간성형 후 1℃/s 이상의 속도로 100℃ 이하로 냉각하여 열간성형 부재를 제조하는 단계를 포함하고,
상기 도금강판의 가열시 최대가열온도가 Ac3+10℃ 초과 ~ Ac3+200℃ 미만의 온도영역을 만족하고, 상기 100℃ 이하로 냉각 후 1~20면적%의 잔류 오스테나이트와 잔부 마르텐사이트 및 베이나이트 중 1종 이상을 포함하는 미세조직이 형성되는 것인 균열전파 저항성 및 연성이 우수한 열간성형 부재의 제조방법.
- 제 5항에 있어서,
상기 소지강판은 강 슬라브를 1000~1300℃에서 재가열처리 하는 단계; 상기 재가열된 강 슬라브를 Ar3~1000℃에서 마무리 열간압연하여 열연강판으로 제조하는 단계; 및 상기 열연강판을 Ms점 초과~750℃ 이하에서 권취하는 단계를 포함하여 제조된 열연강판인 균열전파 저항성 및 연성이 우수한 열간성형 부재의 제조방법.
- 제 6항에 있어서,
상기 소지강판은 상기 열연강판을 산세한 후 10~80%의 압하율로 냉간압연하는 단계 및 상기 냉간압연 후 400~700℃에서 1~100시간 동안 연속소둔하는 단계를 포함하여 제조된 냉연강판인 균열전파 저항성 및 연성이 우수한 열간성형 부재의 제조방법.
- 제 7항에 있어서,
상기 열연강판 또는 산세된 열연강판을 400~700℃에서 1~100시간 상소둔(bath annealing)하는 단계를 더 포함하는 것인 균열전파 저항성 및 연성이 우수한 열간성형 부재의 제조방법.
- 제 5항에 있어서,
상기 소지강판은 다음의 (1) 내지 (4) 그룹 중에서 하나 이상의 그룹을 더 포함하는 균열전파 저항성 및 연성이 우수한 열간성형 부재의 제조방법.
(1) 크롬(Cr) 및 몰리브덴(Mo) 중 1종 이상을 함량 합으로 0.001~2.0%
(2) 티타늄(Ti), 니오븀(Nb) 및 바나듐(V) 중 1종 이상을 함량 합으로 0.001~0.2%
(3) 구리(Cu) 및 니켈(Ni) 중 1종 이상을 함량 합으로 0.005~2.0%
(4) 보론(B): 0.0001~0.01%
- 제 5항에 있어서,
상기 냉각하여 얻은 열간성형 부재를 150~600℃로 가열한 후 1~100000초 동안 유지하는 템퍼링 단계를 더 포함하고, 상기 템퍼링 후 1~30면적%의 잔류 오스테나이트와 잔부 템퍼드 마르텐사이트 및 베이나이트 중 1종 이상을 포함하는 미세조직이 형성되는 것인 균열전파 저항성 및 연성이 우수한 열간성형 부재의 제조방법.
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| JP2019500276A JP6762415B2 (ja) | 2016-07-07 | 2017-07-07 | 亀裂伝播抵抗性及び延性に優れた熱間成形部材、及びその製造方法 |
| MX2019000298A MX2019000298A (es) | 2016-07-07 | 2017-07-07 | Miembro formado a presion en caliente que tiene excelente resistencia a la propagacion de grieta y ductilidad, y metodo para producir el mismo. |
| US16/315,767 US11827947B2 (en) | 2016-07-07 | 2017-07-07 | Hot press-formed member having excellent crack propagation resistance and ductility, and method for producing same |
| CN202310830369.4A CN116837295A (zh) | 2016-07-07 | 2017-07-07 | 耐裂纹扩展性及延展性优异的热压成型部件及其制造方法 |
| EP17824596.5A EP3483297B1 (en) | 2016-07-07 | 2017-07-07 | Hot forming member having excellent crack propagation resistance and ductility, and method for producing same |
| PCT/KR2017/007328 WO2018009041A1 (ko) | 2016-07-07 | 2017-07-07 | 균열전파 저항성 및 연성이 우수한 열간성형 부재 및 이의 제조방법 |
| CN201780042360.XA CN109477191A (zh) | 2016-07-07 | 2017-07-07 | 耐裂纹扩展性及延展性优异的热压成型部件及其制造方法 |
| ES17824596T ES2917620T3 (es) | 2016-07-07 | 2017-07-07 | Miembro formador en caliente con excelente resistencia a la propagación de grietas y ductilidad, y procedimiento para su producción |
| PL17824596.5T PL3483297T3 (pl) | 2016-07-07 | 2017-07-07 | Element formowany na gorąco posiadający doskonałą odporność na propagację pęknięć i ciągliwość oraz sposób jego wytwarzania |
| US18/375,764 US20240026479A1 (en) | 2016-07-07 | 2023-10-02 | Hot press-formed member having excellent crack propagation resistance and ductility, and method for producing same |
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