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不鏽鋼中厚板缺陷原因及預(yù)防措施

日期:2025-05-10 15:31
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摘要:<span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">不鏽鋼中厚板缺陷原因及預(yù)防措施</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">不鏽鋼中厚板是指厚度</span><span style="font-family:'Times New Roman';"><span lang="EN-US">4~25.0mm</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">的鋼板。厚度</span><span style="font-family:'Times New Roman';"><span lang="EN-US">25.0~100.0mm</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">的稱為厚板,厚度超過(guò)</span><span style="font-family:'Times New Roman';"><span lang="EN-US">100.0mm</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">的為特厚板。廣泛用來(lái)製作各種容器、爐殼、爐板、橋梁及汽車靜鋼鋼板、低合金鋼鋼板、橋梁用鋼板、造般鋼板、鍋爐鋼板、壓力容器鋼板、花紋鋼板、汽車大梁鋼板,拖拉機(jī)某些零件及焊接構(gòu)件。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">不鏽鋼板缺陷</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">不鏽鋼中厚板在使用過(guò)程中要注意缺陷的產(chǎn)生,鋼板表麵的小縱裂、峰狀裂紋、邊線裂紋、夾雜、結(jié)疤會(huì)影響表麵質(zhì)量,造成改判,使得產(chǎn)品質(zhì)量下降。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">不鏽鋼板缺陷的形態(tài)表現(xiàn)</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">1</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、小縱裂,鋼板表麵小縱裂形態(tài)為長(zhǎng)度小於</span><span style="font-family:'Times New Roman';"><span lang="EN-US">200mm</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、寬度小於</span><span style="font-family:'Times New Roman';"><span lang="EN-US">3mm</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、深度小於</span><span style="font-family:'Times New Roman';"><span lang="EN-US">0.3mm</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">2</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、峰狀裂紋,該裂紋全部發(fā)生在鋼板下表的距邊部</span><span style="font-family:'Times New Roman';"><span lang="EN-US">5-60mm</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">處,宏觀方向與軋製方向垂直,呈“山峰”狀。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">3</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、邊線裂紋,該裂紋主要發(fā)生在鋼板距邊部</span><span style="font-family:'Times New Roman';"><span lang="EN-US">20-80mm</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">處,形態(tài)為多條大小不一的並行縱向裂紋,其規(guī)律是鋼板規(guī)格越厚、越寬,此類缺陷越嚴(yán)重。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">4</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、夾雜、結(jié)疤,夾雜、結(jié)疤呈規(guī)律性分布,經(jīng)過(guò)邊部火焰扒皮裂紋檢查或鑄坯劃痕火焰清理等精整操作後的現(xiàn)象明顯。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">不鏽鋼板產(chǎn)生缺陷的原因</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">小縱裂是細(xì)小雜質(zhì)混入結(jié)晶器形成;</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">峰狀裂紋產(chǎn)生的原因主要是鑄坯外弧皮下角橫裂所致;</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">邊線裂紋是在軋製過(guò)程中因鑄坯棱角向表麵的側(cè)翻所致;</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">夾雜、結(jié)疤是精整時(shí)表麵氧化渣未清理乾淨(jìng)所致。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;"><span style="font-size:small;">不鏽鋼板防止缺陷產(chǎn)生的措施</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">1</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、定期對(duì)結(jié)晶器檢查,特彆是水樣,查看是否有小雜質(zhì)混入,引起水質(zhì)變化。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">2</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、嚴(yán)格控製設(shè)備超齡服役,確保扇形段維護(hù)的及時(shí)型,避免因發(fā)生扇形段局部輥?zhàn)硬晦D(zhuǎn)導(dǎo)致鑄坯深度劃痕。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">3</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、實(shí)施彎曲段配水分區(qū)控製,動(dòng)態(tài)控製不同寬度端麵鑄坯的角部溫度,避免鑄坯在彎曲過(guò)程中角部溫度進(jìn)入脆性區(qū)。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">4</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、儘可能用寬端麵鑄坯生產(chǎn)大寬度鋼板,減少鋼板軋製時(shí)的展寬量,從而減輕寬鋼板軋製時(shí)的邊部不均勻變形程度,弱化鋼板出現(xiàn)邊線裂紋的寬向程度。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">5</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、提高鑄坯在加熱爐內(nèi)加入溫度的均勻性,優(yōu)化板坯加熱工藝,減少鑄坯上下麵溫差,降低軋件上下麵變形抗力差彆,從而縮小軋件邊部的不均勻變形。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span style="font-size:small;"><span style="font-family:'Times New Roman';"><span lang="EN-US">6</span></span><span style="font-family:宋體;mso-ascii-font-family:&quot;Times New Roman&quot;;mso-hansi-font-family:&quot;Times New Roman&quot;;">、提高鑄坯精整能力,避免出現(xiàn)鑄坯精整後的氧化渣清理不徹底、局部深度燒痕等二次缺陷的發(fā)生。</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span> <p style="margin:0cm 0cm 0pt;"> <span lang="EN-US"><span style="font-family:'Times New Roman';font-size:small;">&nbsp;</span></span> </p> <span style="font-family:宋體;font-size:small;"> </span>

不鏽鋼中厚板缺陷原因及預(yù)防措施

不鏽鋼中厚板是指厚度4~25.0mm的鋼板。厚度25.0~100.0mm的稱為厚板,厚度超過(guò)100.0mm的為特厚板。廣泛用來(lái)製作各種容器、爐殼、爐板、橋梁及汽車靜鋼鋼板、低合金鋼鋼板、橋梁用鋼板、造般鋼板、鍋爐鋼板、壓力容器鋼板、花紋鋼板、汽車大梁鋼板,拖拉機(jī)某些零件及焊接構(gòu)件。

不鏽鋼板缺陷

不鏽鋼中厚板在使用過(guò)程中要注意缺陷的產(chǎn)生,鋼板表麵的小縱裂、峰狀裂紋、邊線裂紋、夾雜、結(jié)疤會(huì)影響表麵質(zhì)量,造成改判,使得產(chǎn)品質(zhì)量下降。

不鏽鋼板缺陷的形態(tài)表現(xiàn)

1、小縱裂,鋼板表麵小縱裂形態(tài)為長(zhǎng)度小於200mm、寬度小於3mm、深度小於0.3mm。

2、峰狀裂紋,該裂紋全部發(fā)生在鋼板下表的距邊部5-60mm處,宏觀方向與軋製方向垂直,呈“山峰”狀。

3、邊線裂紋,該裂紋主要發(fā)生在鋼板距邊部20-80mm處,形態(tài)為多條大小不一的並行縱向裂紋,其規(guī)律是鋼板規(guī)格越厚、越寬,此類缺陷越嚴(yán)重。

4、夾雜、結(jié)疤,夾雜、結(jié)疤呈規(guī)律性分布,經(jīng)過(guò)邊部火焰扒皮裂紋檢查或鑄坯劃痕火焰清理等精整操作後的現(xiàn)象明顯。

不鏽鋼板產(chǎn)生缺陷的原因

小縱裂是細(xì)小雜質(zhì)混入結(jié)晶器形成;

峰狀裂紋產(chǎn)生的原因主要是鑄坯外弧皮下角橫裂所致;

邊線裂紋是在軋製過(guò)程中因鑄坯棱角向表麵的側(cè)翻所致;

夾雜、結(jié)疤是精整時(shí)表麵氧化渣未清理乾淨(jìng)所致。

不鏽鋼板防止缺陷產(chǎn)生的措施

1、定期對(duì)結(jié)晶器檢查,特彆是水樣,查看是否有小雜質(zhì)混入,引起水質(zhì)變化。

2、嚴(yán)格控製設(shè)備超齡服役,確保扇形段維護(hù)的及時(shí)型,避免因發(fā)生扇形段局部輥?zhàn)硬晦D(zhuǎn)導(dǎo)致鑄坯深度劃痕。

3、實(shí)施彎曲段配水分區(qū)控製,動(dòng)態(tài)控製不同寬度端麵鑄坯的角部溫度,避免鑄坯在彎曲過(guò)程中角部溫度進(jìn)入脆性區(qū)。

4、儘可能用寬端麵鑄坯生產(chǎn)大寬度鋼板,減少鋼板軋製時(shí)的展寬量,從而減輕寬鋼板軋製時(shí)的邊部不均勻變形程度,弱化鋼板出現(xiàn)邊線裂紋的寬向程度。

5、提高鑄坯在加熱爐內(nèi)加入溫度的均勻性,優(yōu)化板坯加熱工藝,減少鑄坯上下麵溫差,降低軋件上下麵變形抗力差彆,從而縮小軋件邊部的不均勻變形。

6、提高鑄坯精整能力,避免出現(xiàn)鑄坯精整後的氧化渣清理不徹底、局部深度燒痕等二次缺陷的發(fā)生。

 

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