钢铁
鋼鐵
강철
IRON & STEEL
2015年
3期
44-48
,共5页
谢文新%包燕平%王敏%张旭东
謝文新%包燕平%王敏%張旭東
사문신%포연평%왕민%장욱동
轴承钢%MgO-Al2O3尖晶石%夹杂物分布%高频探伤
軸承鋼%MgO-Al2O3尖晶石%夾雜物分佈%高頻探傷
축승강%MgO-Al2O3첨정석%협잡물분포%고빈탐상
bearing steel%MgO-Al2O3 spinel%inclusions distribution%high frequency defect detection
为了系统分析某厂高碳轴承钢(GCr15)高频探伤缺陷的形成原因,采用ASPEX自动扫描电镜跟踪了冶炼各环节与缺陷相关类型夹杂物的来源和演变。结果表明,造成高频探伤不合格的主要原因存在于基体中的大颗粒MgO-Al2O3夹杂物;冶炼过程中LF工序和中间包是MgO-Al2O3夹杂物产生的主要场所,此类夹杂经VD处理后降低了93.1%;通过提高中间包耐火材料的体积密度和耐压强度,合理降低耐火材料中SiO2和MgO的质量分数,使得中间包耐火材料的侵蚀程度大幅度降低,GCr15轴承钢高频探伤合格率从79%提高到98%。
為瞭繫統分析某廠高碳軸承鋼(GCr15)高頻探傷缺陷的形成原因,採用ASPEX自動掃描電鏡跟蹤瞭冶煉各環節與缺陷相關類型夾雜物的來源和縯變。結果錶明,造成高頻探傷不閤格的主要原因存在于基體中的大顆粒MgO-Al2O3夾雜物;冶煉過程中LF工序和中間包是MgO-Al2O3夾雜物產生的主要場所,此類夾雜經VD處理後降低瞭93.1%;通過提高中間包耐火材料的體積密度和耐壓彊度,閤理降低耐火材料中SiO2和MgO的質量分數,使得中間包耐火材料的侵蝕程度大幅度降低,GCr15軸承鋼高頻探傷閤格率從79%提高到98%。
위료계통분석모엄고탄축승강(GCr15)고빈탐상결함적형성원인,채용ASPEX자동소묘전경근종료야련각배절여결함상관류형협잡물적래원화연변。결과표명,조성고빈탐상불합격적주요원인존재우기체중적대과립MgO-Al2O3협잡물;야련과정중LF공서화중간포시MgO-Al2O3협잡물산생적주요장소,차류협잡경VD처리후강저료93.1%;통과제고중간포내화재료적체적밀도화내압강도,합리강저내화재료중SiO2화MgO적질량분수,사득중간포내화재료적침식정도대폭도강저,GCr15축승강고빈탐상합격솔종79%제고도98%。
The formation reasons of defects in high-frequency detection of bearing steel (GCr15) were analyzed systemati-cally,by tracking the source and evolution of inclusions associated with defects in different locations using ASPEX auto-matic scanning electron microscope. The results showed that,large MgO-Al2O3 inclusions existing in steel matrix resulted in the defects. Most of MgO-Al2O3 inclusions are produced in ladle furnace (LF) and tundish locations;the removal rate of MgO-Al2O3 inclusions reached 93.1 percent during vacuum degassing furnace (VD) process. Erosion of tundish refractory reduced significantly and the qualified rate of defect detection of GCr15 bearing steel of enhanced from 79%to 98%by improving the volume density and compressive strength of refractory,and reducing content of MgO and SiO2 in tundish refractory.