軸承鋼中D類夾雜物的形成與控制

李明; 王新成; 段加恒; 楊文; 成功; 王磊; 楊利偉; 張立峰

doi:10.13374/j.issn2095-9389.2018.s1.005

軸承鋼中D類夾雜物的形成與控制

doi: 10.13374/j.issn2095-9389.2018.s1.005

李明¹,
王新成¹,
段加恒^1, ,,
楊文¹,
成功¹,
王磊²,
楊利偉²,
張立峰¹

1. 北京科技大學冶金與生態工程學院;
2. 南京鋼鐵股份有限公司

基金項目:

中央高校基本科研業務費專項資金資助項目 (FRF-TP-17-001C2)

國家重點研發計劃資助項目 (2016YFB0300102-05, 2017YFB0304000, 2017YFB0304001)

國家自然科學基金資助項目 (51725402)

北京市科技計劃資助項目 (Z171100002217063)

廣西重點研發計劃資助項目 (AB17129006)

詳細信息

通訊作者:
段加恒, E-mail:18810654077@163.com

中圖分類號: TF762.4
計量
- 文章訪問數: 18
- HTML全文瀏覽量: 4
- PDF下載量: 0
- 被引次數: 0
出版歷程
- 收稿日期: 2018-05-08
- 網絡出版日期: 2023-07-18

Formation and controlling of Type-D inclusions in bearing steel

1. School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing;
2. Nanjing Iron and Steel Co.,Ltd.

摘要

摘要: 軸承鋼對鋼中非金屬夾雜物, 尤其是對D類夾雜物的要求非常嚴格.為了分析國內某鋼廠GCr15軸承鋼棒材試樣探傷不合的D類夾雜物形成原因并提出有效控制措施, 采用ASPEX自動掃描電鏡對GCr15軸承鋼生產工藝優化前后全流程夾雜物的演變進行觀察.研究結果表明, 原工藝下軸承鋼中D類鈣鋁酸鹽夾雜物生成的主要原因包括兩個方面, 一是精煉渣堿度過高導致渣中Ca O活度很大;二是在真空脫氣 (VD) 精煉過程中, 強烈攪拌給鋼-渣反應提供了良好的動力學條件.本文從精煉渣堿度和VD真空度兩方面對軸承鋼生產工藝進行了優化.優化后能夠在保持高潔凈度情況下, 使鋼中夾雜物由鈣鋁酸鹽類轉變為鎂鋁尖晶石類, 減少了軸承鋼中D類夾雜物的生成.
- 軸承鋼 /
- D類夾雜 /
- 精煉渣 /
- 堿度 /
- 真空度
Abstract: There are strict requirements for non-metallic inclusions in bearing steel, especially for Type-D inclusions.To analyze the formation mechanism of Type-D inclusions in high-frequency detection defects of GCr15 bearing steel bar sample in domestic steel plant and give the effective controlling measure, the inclusion evolution in bearing steel production process before and after optimization was investigated by ASPEX automatic scanning electron microscope.The results show that, the main formation mechanism of calcium aluminate Type-D inclusions present in the original process includes two aspects:one is the high basicity of refining slag, resulting in the high Ca O activity in slag.The other is the strong stirring in vacuum degassing (VD) process, providing good kinetic conditions for slag-steel reactions.The bearing steel production process is optimized from the basicity of refining slag and the vacuum degree of VD process.After optimization, the inclusions change from calcium aluminate to spinel type, and the formation of Type-D inclusions in bearing steel is reduced.Meanwhile, the high cleanliness of bearing steel is maintained.
- bearing steel /
- type-D inclusions /
- refining slag /
- basicity /
- vacuum degree

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參考文獻(14)

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