TWI472627B - 加工性優良的高強度鋼板的製造方法 - Google Patents
加工性優良的高強度鋼板的製造方法 Download PDFInfo
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Description
本發明是有關於一種適合用於汽車零件用途的加工性優良的高強度鋼板的製造方法。
近年來,根據保護地球環境的觀點,汽車的燃料效率(fuel efficiency)提高已成為重要的課題。因此,藉由車體材料的高強度化來致力於輕薄化,並藉由車體自身的輕量化來致力於燃料效率提高的行動變得活躍。藉由如同汽車零件般地沖壓加工(stamping)或彎曲加工(bending)而成型為製品的鋼板,此鋼板被要求能夠保持高強度並且能夠承受加工的成形性。專利文獻1中藉由雙相位(dual phase)退火高錳(Mn)鋼,得到高強度延性。專利文獻2中以高Mn鋼熱軋後組織作為變韌鐵(bainite)‧麻田散鐵(martensite)組織,並藉由退火回火而使微細的殘留沃斯田鐵(austenite)形成,進而藉由成為包含回火變韌鐵和回火麻田散鐵的複合組織來改善局部延性。
[專利文獻1]日本專利特開平1-259120號公報
[專利文獻2]日本專利特開2003-138345號公報
但是,前述的專利文獻1中,對於藉由Mn濃集(concentrate)的加工性提高未做任何研究,關於加工性可看到改善的空間。專利文獻2中,由於含有很多在高溫
下回火的變韌鐵‧麻田散鐵的組織,因此無法說具有充分的強度,而且,為了改善局部延性,殘留沃斯田鐵量被限制,而總伸長率亦不充分。
本發明的目的在於提供加工性優良的高強度鋼板的製造方法,該高強度鋼板有利地解決了上述的先前技術所擁有的問題,並且適合作為使用於汽車零件用途的鋼板,且該高強度鋼板的張力強度(tension strength,TS):980MPa以上、總伸長率(elongation rate,EL):25%以上。
本發明者們,為了製造加工性優良的高強度鋼板,從鋼板的組成成分及製造方法的觀點來反覆地潛心研究,結果發現以下的事情。即發現了:對添加了3.5%以上Mn量、0.5%以上矽(Si)量的鋼實施熱軋後,實施在到達溫度Ac1℃~Ac1+100℃下保持3分鐘的熱處理,接著以20%以上的壓下率(draft)冷軋後,在退火時,加熱至到達溫度Ac1-30℃~Ac1+100℃並保持1分鐘以上;或者對添加了3.5%以上Mn量、0.5%以上Si量的鋼實施熱軋後,以20%以上的壓下率實施冷軋,接著實施在到達溫度Ac1℃~Ac1+100℃下保持3分鐘以上的熱處理,之後,在退火時,加熱至到達溫度Ac1-30℃~Ac1+100℃並保持1分鐘以上,藉此可以達成上述的課題。
本發明以如此般的發現作為基礎,提供以下的發明。
(1)一種加工性優良的高強度鋼板的製造方法,其特徵在於,包括:準備鋼坯,鋼坯具有的組成成分包含:以
質量%計而含有碳(C):0.03%~0.35%、Si:0.5%~3.0%、Mn:3.5%~10.0%、磷(P):0.100%以下、硫(S):0.02%以下,其餘部份為鐵(Fe)及不可避免的雜質;熱軋前述鋼坯;對熱軋過的前述鋼板實施在Ac1℃~Ac1+100℃的到達溫度下保持3分鐘以上的熱處理;以20%以上的壓下率冷軋實施過熱處理的前述鋼板;對冷軋過的前述鋼板實施在Ac1-30℃~Ac1+100℃的到達溫度下保持1分鐘以上的退火。
(2)一種加工性優良的高強度鋼板的製造方法,其特徵在於,包括:準備鋼坯,鋼坯具有的組成成分包含:以質量%計而含有C:0.03%~0.35%、Si:0.5%~3.0%、Mn:3.5%~10.0%、P:0.100%以下、S:0.02%以下,其餘部份為鐵(Fe)及不可避免的雜質;熱軋前述鋼坯;以20%以上的壓下率冷軋熱軋過的前述鋼板;對實施過冷軋的前述鋼板實施在Ac1℃~Ac1+100℃的到達溫度下保持3分鐘以上的熱處理;對熱處理過的前述鋼板實施在Ac1-30℃~Ac1+100℃的到達溫度下保持1分鐘以上的退火。
(3)如(1)或(2)所述之加工性優良的高強度鋼板的製造方法,其中前述鋼坯以質量%計更含有鋁(Al):0.01%~2.00%。
(4)如(3)所述之加工性優良的高強度鋼板的製造方法,其中前述Al含有量以質量%計為0.10%~2.00%。
(5)如(1)至(4)中任一項所述之加工性優良的高
強度鋼板的製造方法,其中前述鋼坯以質量%計更含有從鉻(Cr):0.005%~2.00%、鉬(Mo):0.005%~2.00%、釩(V):0.005%~2.00%、鎳(Ni):0.005%~2.00%、銅(Cu):0.005%~2.00%中選出的至少一種的元素。
(6)如(1)至(5)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述鋼坯以質量%計更含有從鈦(Ti):0.005%~0.20%、鈮(Nb):0.005%~0.20%中選出的至少一種的元素。
(7)如(1)至(6)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述鋼坯以質量%計更含有硼(B):0.0003%~0.0050%。
(8)如(1)至(7)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述鋼坯以質量%計更含有從鈣(Ca):0.001%~0.005%、稀土金屬(Rare Earth Metals,REM):0.001%~0.005%中選出的至少一種的元素。
(9)如(1)至(8)中任一項所述之加工性優良的高強度鋼板的製造方法,更包括對實施過退火的前述鋼板實施熱浸鍍鋅(Hot dip galvanizing process)。
(10)如(1)至(8)中任一項所述之加工性優良的高強度鋼板的製造方法,更包括對前述實施過退火的鋼板實施熱浸鍍鋅,進而再實施鍍鋅的合金化處理。
(11)如(1)至(10)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述加工性優良的高強度鋼板為具有張力強度(TS):980MPa以上、總伸長率(EL):
25%以上的加工性優良的高強度鋼板。
(12)如(1)至(11)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述C含有量以質量%計為0.07%~0.25%。
(13)如(1)至(12)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述Si含有量以質量%計為0.8%~2.3%。
(14)如(1)至(13)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述Mn含有量以質量%計為3.8%~8.0%。
(15)如(1)至(14)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述Al含有量以質量%計為0.15%~1.5%。
(16)如(15)所述之加工性優良的高強度鋼板的製造方法,其中前述Al含有量以質量%計為0.20%~1.0%。
(17)如(1)至(16)中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述熱處理為在Ac1℃~Ac1+100℃的到達溫度下保持30分鐘以上的熱處理。
藉由本發明,可獲得適合作為使用於汽車零件用途的鋼板的張力強度(TS):980MPa以上且總伸長率(EL):25%以上,而且加工性優良的高強度鋼板。
以下,對本發明的細節進行說明。此外,表示成分元素的含有量的「%」,只要無特別記載,則為「質量%」的意思。
1)組成成分
C:0.03%~0.35%
C是為了使麻田散鐵或回火麻田散鐵等的低溫變態相生成而使TS上升所必須的元素。而且,C亦是為了使沃斯田鐵安定而使殘留沃斯田鐵生成,並使鋼的加工性提高的有效的元素。若C量未滿0.03%,則殘留沃斯田鐵的生成變得不充分,且難以獲得高加工性。另一方面,若C量超過0.35%,則點熔接性(spot welding)會劣化。因此,C量設為0.03%~0.35%,較佳為0.07%~0.25%。
Si:0.5%~3.0%
Si是為了固熔強化鋼而使TS提高、或抑制碳化物而使殘留沃斯田鐵生成,並使鋼的加工性提高的有效的元素。為了獲得如上的效果,必須將Si量設為0.5%以上。另一方面,若Si超過3.0%,則脆性(fragility)變得明顯,且導致表面性狀或熔接性劣化。因此,Si量設為0.5%~3.0%,較佳為0.8%~2.3%。
Mn:3.5%~10.0%
Mn為固熔強化鋼而使TS提高、或促進麻田散鐵或回火麻田散鐵等的低溫變態相的生成的元素。而且,Mn是為了使沃斯田鐵安定而使殘留沃斯田鐵生成的有效的元素。為了獲得如上的效果,必須將Mn量設為3.5%以上。
另一方面,若Mn超過10.0%,則ε麻田散鐵變得容易被生成,而且加工性顯著地降低。因此,Mn量設為3.5%~10.0%,較佳為3.8%~8.0%。
P:0.100%以下
由於P藉由晶界偏析(grain boundary segregation)使鋼劣化,並且使熔接性劣化,因此期望盡可能地減低P量。但是,從製造成本的方面等來考量,P量較佳為0.100%以下。
S:0.02%以下
由於S作為MnS等的夾雜物而存在,而會使熔接性劣化,所以較佳為盡可能地減低S量。但是,從製造成本的方面等來考量,S量較佳為0.02%以下。
剩餘部分包含Fe及不可避免的雜質。視需要而可以適當地含有一種以上的以下的元素。
Al:0.10%~2.00%
Al是為了抑制碳化物的生成,且使殘留沃斯田鐵生成的有效的元素。為了獲得如上的效果,較佳為添加0.10%以上。此外,若其添加量為2.00%以下,則不會阻礙加熱時的沃斯田鐵的形成,低溫變態相變得容易獲得,因而,高強度高加工性變得容易獲得。因此,期望Al量為0.10%~2.00%。更佳為0.15%~1.5%,最佳為0.20%~1.0%。另外,從較佳效率地進行鋼的脫氧的觀點來看,較佳為使Al量含有0.01%以上。
從Cr:0.005%~2.00%、Mo:0.005%~2.00%、V:
0.005%~2.00%、Ni:0.005%~2.00%、Cu:0.005%~2.00%中選出的至少一種
Cr、Mo、V、Ni、Cu為生成麻田散鐵等的低溫變態相而高強度化的有效的元素。為了獲得如上的效果,較佳為從Cr、Mo、V、Ni、Cu中選出的至少一種的元素的含有量設為0.005%以上。此外,若Cr、Mo、V、Ni、Cu的個別的含有量為2.00%以下的話,則不會導致成本上升,而且可發現如上的效果。因此,較佳為將Cr、Mo、V、Ni、Cu的含有量個別設為0.005%~2.00%。
從Ti:0.005%~0.20%、Nb:0.005%~0.20%中選出的至少一種
Ti、Nb是為了形成碳氮化物,並藉由析出強化鋼而高強度化的有效的元素。為了獲得如上的效果,較佳為Ti、Nb的含有量設為0.005%以上。此外,若Ti、Nb的含有量為0.20%以下的話,則EL不會降低,而且可得到高強度化的效果。因此,較佳為Ti、Nb的含有量個別設為0.005%~0.20%。
B:0.0003%~0.0050%
B是為了抑制來自沃斯田鐵晶界的肥粒鐵(ferrite)生成,並使低溫變態相生成而使鋼的強度上升的有效的元素。為了獲得如上的效果,期望為含有0.0003%以上的B。此外,若為0.0050%以下的話,則不會導致成本上升,而且可發現如上的效果。因此,較佳為B的含有量設為0.0003%~0.0050%。
從Ca:0.001%~0.005%、REM:0.001%~0.005%中選出的至少一種
Ca、REM兩者皆是為了藉由硫化物的形態控制使加工性改善的有效的元素。為了獲得如上的效果,較佳為從Ca、REM中選出的至少一種的元素的含有量設為0.001%以上。此外,若Ca、REM的個別的含有量為0.005%以下的話,則不會對鋼的清淨度(Cleanliness)造成不良影響,而且可以改善上述的特性。因此,較佳為Ca、REM的含有量個別設為0.001%~0.005%。
2)製造條件
本發明的高強度鋼板以如下處理方式製造:於具有上述的組成成分的鋼坯,熱軋之後,實施酸洗,接著,以20%以上的壓下率實施冷軋後,實施在到達溫度Ac1℃~Ac1+100℃下保持3分鐘以上的熱處理;或者,於具有上述組成成分的鋼坯,熱軋之後,實施在到達溫度Ac1℃~Ac1+100℃下保持3分鐘以上的熱處理,之後,酸洗,接著以20%以上的壓下率實施冷軋。之後,進行加熱至到達溫度Ac1-30℃~Ac1+100℃並保持1分鐘以上的退火。
進而,本發明中還可以實施如下的處理:上述退火處理後,實施熱浸鍍鋅處理;或者熱浸鍍鋅處理後,進而再實施鍍鋅的合金化處理。
以下,詳細地說明。
冷軋的壓下率:20%以上
熱處理條件:在到達溫度Ac1℃~Ac1+100℃下保持3分鐘以上
本發明中,冷軋的壓下率是極為重要的。藉由以20%以上的壓下率來進行冷軋,之後的熱處理或退火時發生肥粒鐵的再結晶,可獲得微細且富延性的再結晶肥粒鐵,並提高加工性。此外,藉由肥粒鐵的微細析出,沃斯田鐵微細地被分段,而可得到更安定的殘留沃斯田鐵,並提高加工性。再者,Ac1變態點藉由以下的式子求取。
Ac1(℃)=751+500C+35Si-28Mn-16Ni-100(C≦0.15%)
Ac1(℃)=751+143C+35Si-28Mn-16Ni-30(C>0.15%)
式子中的元素符號表示鋼中的各元素的含有量(質量%)。
熱處理可於冷軋前進行,亦可於冷軋後、退火前進行。本發明中,退火前進行的熱處理是極為重要的。藉由此熱處理,Mn於沃斯田鐵中濃集,退火時可使沃斯田鐵迅速地生成。而且,由於退火時的往沃斯田鐵中的Mn濃集被促進,因此可獲得更安定的殘留沃斯田鐵,並提高加工性。到達溫度未滿Ac1時逆變態不會發生,而無法使Mn往沃斯田鐵中濃集。另一方面,若到達溫度超過Ac1+100℃,則肥粒鐵分率變少,因而,往沃斯田鐵中的Mn濃集量變小,並且沃斯田鐵變得不安定,而變得無法獲得充分的加工性。因此,熱處理的到達溫度設為Ac1℃~Ac1+100℃。
若在到達溫度Ac1℃~Ac1+100℃下的保持時間未滿3分鐘的話,Mn的擴散不會充分地發生,往沃斯田鐵中的
Mn濃集量變小,並且沃斯田鐵變得不安定,而變得無法獲得充分的加工性。因此,熱處理的保持時間設為3分鐘以上,較佳為30分鐘以上。
退火條件:在到達溫度Ac1-30℃~Ac1+100℃下保持1分鐘以上。
藉由前述退火前的熱處理,可獲得具有Mn濃集部的冷軋材,然而未滿Ac1-30℃時逆變態(由肥粒鐵朝沃斯田鐵的變態)不會充分地發生,無法獲得良好的加工性。另一方面,若到達溫度超過Ac1+100℃,則藉由逆變態的沃斯田鐵的生成量增加,因而退火後生成的麻田散鐵的量過度地增加,並且無法獲得良好的加工性。因此,退火時的到達溫度設為Ac1-30℃~Ac1+100℃。
若保持時間未滿1分鐘的話,藉由逆變態的沃斯田鐵的生成變得不充分,並且無法獲得良好的加工性。因此,保持時間設為1分鐘以上。
進行了上述的退火之後,冷卻至室溫。於進行熱浸鍍鋅處理、鍍鋅的合金化處理的場合,較佳為於上述退火後冷卻至室溫的期間中,進行熱浸鍍鋅處理,或進而再進行鍍鋅的合金化處理。
熱浸鍍鋅處理較佳為以下述方式進行:浸漬藉由上述所得的鋼板(退火後的鋼板)於440℃以上500℃以下的熱浸鍍鋅浴中,之後,藉由氣體擦拭(gas wiping)等調整鍍覆附著量。熱浸鍍鋅處理較佳為使用Al量為0.08質量%~0.18質量%的鍍鋅浴。進而,鍍鋅的合金化處理較佳為
於460℃以上580℃以下的溫度範圍保持1秒以上40秒以下來進行合金化。
於冷軋鋼板、熱浸鍍鋅鋼板、合金化熱浸鍍鋅鋼板上,可進行調質軋壓(temper rolling),而該調質軋壓以形狀矯正或表面粗度的調整等為目的。而且,亦可實施樹脂塗佈或油脂塗佈等的各種塗佈處理。
其它的製造方法的條件雖然並沒有特別限定,但較佳為在以下的條件下進行。
為了防止巨觀沉析(macrosegregation),鋼坯較佳以連續鑄造法製造,但是亦可藉由造塊法(ingot making method)、薄鋼坯鑄造法來製造。熱軋鋼坯時,可將鋼坯暫時冷卻至室溫,之後再加熱而進行熱軋;亦可不將鋼坯冷卻至室溫,便裝入加熱爐而進行熱軋。或者,亦可應用僅進行些許的保熱後便直接熱軋的節省能源程序。於加熱鋼坯的場合,為了可使碳化物溶解、防止滾動負載(rolling load)的增大,較佳為加熱至1100℃以上。另外,為了防止氧化損失量(scale loss)的增大,較佳為鋼坯的加熱溫度設為1300℃以下。
熱軋鋼坯時,從即便降低鋼坯的加熱溫度亦可防止軋延(rolling)時的缺陷的觀點來看,亦可加熱粗軋延後的粗條。而且,連接同類的粗條,連續地進行最後滾製(finish rolling),可應用所謂的連續軋延(continuous rolling)。
由於最後滾製有使異向性(anisotropy)增大、使冷軋‧退火後的加工性降低的情形,因此較佳以Ar3變態點以上
的最後處理溫度來進行。而且,為了滾動負載的降低或形狀‧材質的均一化,較佳為進行使最後滾製的全路徑或一部分的路徑的摩擦係數成為0.1~0.25的潤滑軋延。從鋼板形狀安定性的觀點來看,較佳為捲繞條件設為350℃以上。此外,由於在超過650℃的溫度下捲繞的話,則鋼板表面的氧化層不均變得明顯,且表面品質降低,因此較佳為捲繞溫度設為650℃以下。
捲繞後的鋼板藉由酸洗等去除鏽皮後,以上述的條件實施熱處理、冷軋、退火、熱浸鍍鋅。
藉由真空熔解爐熔製表1所示的組成成分的鋼,並且軋延形成鋼坯(表1中,氮(N)為不可避免的雜質)。將這些鋼坯加熱至1200℃後粗軋延,最後滾製後在550℃下捲繞,並且形成板厚2.3mm的熱軋板。接著,在表2、表3所示的條件下進行熱處理,酸洗後,在表2、表3所示的條件下冷軋,製造冷軋鋼板並進行退火。此外,對於一部份鋼坯,熱軋‧酸洗後,在表2、表3所示的條件下冷軋,接著在表2、表3所示的條件下進行熱處理後,進行退火。退火為模擬箱型退火爐、連續退火線、連續熱浸鍍鋅線而在實驗室進行,並且製作出冷軋鋼板、熱浸鍍鋅鋼板及合金化熱浸鍍鋅鋼板。再者,熱浸鍍鋅鋼板為藉由如下的方法製作成:退火後、浸漬於460℃的熱浸鍍鋅浴中、使每一面的鍍覆附著量35g/m2~45g/m2的鍍鋅(雙面鍍覆)形成後,以平均冷卻速度10℃/秒來冷卻;合金化熱浸鍍鋅
鋼板為藉由如下的方法製作成:鍍鋅形成後在560℃下進行30秒的合金化處理,以平均冷卻速度10℃/秒來冷卻。對於所得到的冷軋鋼板及熱浸鍍鋅鋼板、合金化熱浸鍍鋅鋼板,以與軋延方向垂直的方向為張力方向的方式採取JIS5號張力試驗片,並以應變率(strain rate)10-3/秒來進行張力試驗。結果表示於表2、表3。
在本發明例中,確認了TS為980MPa以上且EL為25%以上,並且具有高強度和加工性。另一方面,比較例中,TS、EL的至少一者較差。
藉由本發明可獲得張力強度(TS):980MPa以上、總伸長率(EL):25%以上的加工性優良的高強度鋼板。若本發明的高強度鋼板使用於汽車零件用途的話,可對汽車的輕量化做出貢獻、並且可大大地對汽車車體的高性能化做出貢獻。
Claims (14)
- 一種加工性優良的高強度鋼板的製造方法,其特徵在於,包括:準備鋼坯,前述鋼胚具有的組成成分包含:以質量%計而含有C:0.03%~0.35%、Si:0.5%~3.0%、Mn:3.5%~10.0%、P:0.100%以下、S:0.02%以下,其餘部份為Fe及不可避免的雜質;熱軋前述鋼坯而形成鋼板;對熱軋過的前述鋼板實施在Ac1℃~Ac1+100℃的到達溫度下保持3分鐘以上的熱處理;以20%以上的壓下率冷軋實施過熱處理的前述鋼板;對冷軋過的前述鋼板實施在Ac1-30℃~Ac1+100℃的到達溫度下保持1分鐘以上的退火。
- 一種加工性優良的高強度鋼板的製造方法,其特徵在於,包括:準備鋼坯,前述鋼胚具有的組成成分包含:以質量%計而含有C:0.03%~0.35%、Si:0.5%~3.0%、Mn:3.5%~10.0%、P:0.100%以下、S:0.02%以下,其餘部份為Fe及不可避免的雜質;熱軋前述鋼坯而形成鋼板;以20%以上的壓下率冷軋熱軋過的前述鋼板;對實施過冷軋的前述鋼板實施在Ac1℃~Ac1+100℃的到達溫度下保持3分鐘以上的熱處理;對熱處理過的前述鋼板實施在Ac1-30℃~Ac1+100℃ 的到達溫度下保持1分鐘以上的退火。
- 如申請專利範圍第1項所述之加工性優良的高強度鋼板的製造方法,其中前述鋼坯更含有以下A群~E群中的至少一群:A群:以質量%計,Al:0.01%~2.00%;B群:以質量%計,從Cr:0.005%~2.00%、Mo:0.005%~2.00%、V:0.005%~2.00%、Ni:0.005%~2.00%、Cu:0.005%~2.00%中選出的至少一種的元素;C群:以質量%計,從Ti:0.005%~0.20%、Nb:0.005%~0.20%中選出的至少一種的元素D群:以質量%計,B:0.0003%~0.0050%;E群:以質量%計,從Ca:0.001%~0.005%、REM:0.001%~0.005%中選出的至少一種的元素。
- 如申請專利範圍第2項所述之加工性優良的高強度鋼板的製造方法,其中前述鋼坯更含有以下A群~E群中的至少一群:A群:以質量%計,Al:0.01%~2.00%;B群:以質量%計,從Cr:0.005%~2.00%、Mo:0.005%~2.00%、V:0.005%~2.00%、Ni:0.005%~2.00%、Cu:0.005%~2.00%中選出的至少一種的元素;C群:以質量%計,從Ti:0.005%~0.20%、Nb:0.005%~0.20%中選出的至少一種的元素D群:以質量%計,B:0.0003%~0.0050%;E群:以質量%計,從Ca:0.001%~0.005%、REM: 0.001%~0.005%中選出的至少一種的元素。
- 如申請專利範圍第3項或第4項所述之加工性優良的高強度鋼板的製造方法,其中前述Al含有量以質量%計為0.10%~2.00%。
- 如申請專利範圍第1項至第4項中任一項所述之加工性優良的高強度鋼板的製造方法,更包括對實施過退火的前述鋼板實施熱浸鍍鋅。
- 如申請專利範圍第1項至第4項中任一項所述之加工性優良的高強度鋼板的製造方法,更包括對實施過退火的前述鋼板實施熱浸鍍鋅,進而再實施鍍鋅的合金化處理。
- 如申請專利範圍第1項至第4項中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述加工性優良的高強度鋼板為具有張力強度(TS):980MPa以上、總伸長率(EL):25%以上的加工性優良的高強度鋼板。
- 如申請專利範圍第1項至第4項中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述C含有量以質量%計為0.07%~0.25%。
- 如申請專利範圍第1項至第4項中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述Si含有量以質量%計為0.8%~2.3%。
- 如申請專利範圍第1項至第4項中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述Mn含有量以質量%計為3.8%~8.0%。
- 如申請專利範圍第3項或第4項所述之加工性優 良的高強度鋼板的製造方法,其中前述Al含有量以質量%計為0.15%~1.5%。
- 如申請專利範圍第3項或第4項所述之加工性優良的高強度鋼板的製造方法,其中前述Al含有量以質量%計為0.20%~1.0%。
- 如申請專利範圍第1項至第4項中任一項所述之加工性優良的高強度鋼板的製造方法,其中前述熱處理為在Ac1℃~Ac1+100℃的到達溫度下保持30分鐘以上的熱處理。
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CN1788099A (zh) * | 2003-06-19 | 2006-06-14 | 新日本制铁株式会社 | 成形性优良的高强度钢板及其制造方法 |
TW200600592A (en) * | 2004-03-11 | 2006-01-01 | Nippon Steel Corp | A high strength hot-dip galvanized steel sheet composed of composite microstructure having excellent formability and hole expandability, and a method for production the same |
CN1930316A (zh) * | 2004-03-11 | 2007-03-14 | 新日本制铁株式会社 | 成形性以及扩孔性优良的热浸镀锌复合高强度钢板及其制造方法 |
JP2007046146A (ja) * | 2004-11-15 | 2007-02-22 | Nippon Steel Corp | 高ヤング率鋼板、それを用いた溶融亜鉛めっき鋼板、合金化溶融亜鉛めっき鋼板、高ヤング率鋼管、高ヤング率溶融亜鉛めっき鋼管、及び高ヤング率合金化溶融亜鉛めっき鋼管、並びにそれらの製造方法 |
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CN103890202B (zh) | 2015-09-30 |
CN103890202A (zh) | 2014-06-25 |
EP2772556B1 (en) | 2018-12-19 |
US9617614B2 (en) | 2017-04-11 |
KR101613806B1 (ko) | 2016-04-29 |
WO2013061545A1 (ja) | 2013-05-02 |
JPWO2013061545A1 (ja) | 2015-04-02 |
US20140360632A1 (en) | 2014-12-11 |
JP5532188B2 (ja) | 2014-06-25 |
EP2772556A4 (en) | 2015-04-01 |
TW201317369A (zh) | 2013-05-01 |
KR20140075789A (ko) | 2014-06-19 |
EP2772556A1 (en) | 2014-09-03 |
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