KR101772308B1 - 핫 스탬프 성형체 및 핫 스탬프 성형체의 제조 방법 - Google Patents
핫 스탬프 성형체 및 핫 스탬프 성형체의 제조 방법 Download PDFInfo
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Abstract
Description
도 2는, 핫 스탬프 가열 후의 Zn-Fe 금속간 화합물의 잔존량과 금형에의 도금 부착 정도의 관계를 나타내는 도면이다.
도 3a는, 핫 스탬프 가열 후의 Zn-Fe 금속간 화합물의 잔존량과 도금층의 구조 관계를 나타내는 모식도이며, Zn-Fe 금속간 화합물의 잔존이 없는 경우의 도금층의 구성을 나타내는 모식도이다.
도 3b는, 핫 스탬프 가열 후의 Zn-Fe 금속간 화합물의 잔존량과 도금층의 구조 관계를 나타내는 모식도이며, Zn-Fe 금속간 화합물의 잔존량이 15g/㎡ 이하인 경우의 도금층의 구성을 나타내는 모식도이다.
도 3c는, 핫 스탬프 가열 후의 Zn-Fe 금속간 화합물의 잔존량과 도금층의 구조 관계를 나타내는 모식도이며, Zn-Fe 금속간 화합물의 잔존량이 15g/㎡ 초과인 경우의 도금층의 구성을 나타내는 모식도이다.
도 4는, 핫 스탬프 전의 Zn 도금 부착량과 도금 후의 Zn-Fe 금속간 화합물량의 관계를 나타내는 도면이다.
도 5는, 강판 내부에서의 산화물의 형성량과 도장 밀착성의 관계를 나타내는 도면이다.
도 6a는, 가열 시의 90°의 굽힘 가공의 횟수와 강판 내부에서의 산화물의 형성량의 관계를 나타내는 도면이며, 굽힘 가공 횟수가 0회, 1회, 2회, 3회인 경우를 나타내는 도면이다.
도 6b는, 가열 시의 90°의 굽힘 가공의 횟수와 강판 내부에서의 산화물의 형성량의 관계를 나타내는 도면이며, 굽힘 가공 횟수가 4회, 5회, 7회인 경우를 나타내는 도면이다.
도 6c는, 가열 시의 90°의 굽힘 가공의 횟수와 강판 내부에서의 산화물의 형성량의 관계를 나타내는 도면이며, 굽힘 가공 횟수가 9회, 10회인 경우를 나타내는 도면이다.
도 7은, 가열 시에 시료에 가해지는 굽힘 각도와 강판 내부에서의 산화물의 형성량의 관계를 나타내는 도면이다.
Claims (6)
- 강판의 성분으로서, 질량%로,
C: 0.10∼0.35%,
Si: 0.01∼3.00%,
Al: 0.01∼3.00%,
Mn: 1.0∼3.5%,
P: 0.001∼0.100%,
S: 0.001∼0.010%,
N: 0.0005∼0.0100%,
Ti: 0.000∼0.200%,
Nb: 0.000∼0.200%,
Mo: 0.00∼1.00%,
Cr: 0.00∼1.00%,
V: 0.000∼1.000%,
Ni: 0.00∼3.00%,
B: 0.0000∼0.0050%,
Ca: 0.0000∼0.0050%,
Mg: 0.0000∼0.0050%
를 함유하고, 잔량부가 Fe 및 불순물로 이루어지고, 편면당 도금 부착량 5g/㎡ 이상 40g/㎡ 미만의 전기 아연계 도금이 실시된 전기 아연계 도금 강판을 핫 스탬프한 핫 스탬프 성형체이며,
핫 스탬프 성형체의 도금층이, 0g/㎡∼15g/㎡의 Zn-Fe 금속간 화합물 및 잔량부가 Fe-Zn 고용상으로 구성되어 있으며,
핫 스탬프 성형체의 도금층 중에, 평균 직경 10㎚∼1㎛의 입상 물질이, 도금층 길이 1㎜당 1×10개∼1×104개 존재하는, 핫 스탬프 성형체. - 제1항에 있어서,
상기 강판이, 질량%로,
Ti: 0.001∼0.200%,
Nb: 0.001∼0.200%,
Mo: 0.01∼1.00%,
Cr: 0.01∼1.00%,
V: 0.001∼1.000%,
Ni: 0.01∼3.00%,
B: 0.0002∼0.0050%,
Ca: 0.0002∼0.0050%,
Mg: 0.0002∼0.0050%
의 1종 또는 2종 이상을 함유하는, 핫 스탬프 성형체. - 제1항 또는 제2항에 있어서,
상기 입상 물질이, Si, Mn, Cr 및 Al 중 1종 또는 2종 이상을 함유하는 산화물의 1종 또는 2종 이상인, 핫 스탬프 성형체. - 제1항 또는 제2항에 있어서,
상기 전기 아연계 도금 강판이, 전기 아연 합금 도금 강판인, 핫 스탬프 성형체. - 강(鋼)의 성분으로서, 질량%로,
C: 0.10∼0.35%,
Si: 0.01∼3.00%,
Al: 0.01∼3.00%,
Mn: 1.0∼3.5%,
P: 0.001∼0.100%,
S: 0.001∼0.010%,
N: 0.0005∼0.0100%,
Ti: 0.000∼0.200%,
Nb: 0.000∼0.200%,
Mo: 0.00∼1.00%,
Cr: 0.00∼1.00%,
V: 0.000∼1.000%,
Ni: 0.00∼3.00%,
B: 0.0000∼0.0050%,
Ca: 0.0000∼0.0050%,
Mg: 0.0000∼0.0050%
를 함유하고, 잔량부가 Fe 및 불순물로 이루어지는 강에 대하여, 열연 공정, 산 세정 공정, 냉간압연 공정, 연속 어닐링 공정, 조질 압연 공정, 및 전기 아연계 도금 공정을 행하여, 전기 아연계 도금 강판으로 한 후, 전기 아연계 도금 강판에 대하여 핫 스탬프 성형 공정을 행하여, 핫 스탬프 성형체를 제조할 때,
상기 연속 어닐링 공정에서는, 0.1 체적%∼30 체적%의 수소 및 노점 -70℃∼-20℃에 상당하는 H2O를 포함하고, 잔량부가 질소 및 불순물인 분위기 가스 중에 있어서, 강판의 가열 중에 또한 판 온도가 350℃∼700℃의 범위 내에서, 강판에 대하여 굽힘 각도 90°∼220°의 반복 굽힘을 4회 이상 행하고,
상기 전기 아연계 도금 공정에서는, 강판에 대하여 편면당 도금 부착량 5g/㎡ 이상 40g/㎡ 미만의 전기 아연계 도금을 실시하고,
상기 핫 스탬프 성형 공정에서는, 전기 아연계 도금 강판에 대하여 50℃/초 이상의 평균 승온 속도로 700℃∼1100℃의 온도 범위까지 승온하고, 승온의 개시부터 핫 스탬프에 이르기까지의 시간이 1분 이내에 핫 스탬프를 행한 후, 상온까지 냉각하는, 핫 스탬프 성형체의 제조 방법. - 제5항에 있어서,
상기 강이, 질량%로,
Ti: 0.001∼0.200%,
Nb: 0.001∼0.200%,
Mo: 0.01∼1.00%,
Cr: 0.01∼1.00%,
V: 0.001∼1.000%,
Ni: 0.01∼3.00%,
B: 0.0002∼0.0050%,
Ca: 0.0002∼0.0050%,
Mg: 0.0002∼0.0050%
의 1종 또는 2종 이상을 함유하는, 핫 스탬프 성형체의 제조 방법.
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