Effect of Nonmetallic Inclusion on Impact Toughness of High Strength Oil Casing

Deng Xuyan; Wang Juchao; Zhang Lingtong; Wang Shuling

doi:10.20057/j.1003-8620.N250523

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Effect of Nonmetallic Inclusion on Impact Toughness of High Strength Oil Casing

Application and Service | 更新时间：2026-05-12

- Effect of Nonmetallic Inclusion on Impact Toughness of High Strength Oil Casing
- Special Steel Vol. 47, Issue 3, Pages: 137-142(2026)
- 作者机构：
  
  达力普石油专用管有限公司，沧州 061000
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.N250523
  CLC： TG142.1
- Received：22 August 2025，
  
  Revised：2025-10-11，
  
  Accepted：15 October 2025，
  
  Published：30 May 2026
- 稿件说明：
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邓叙燕,王居超,张玲通等.非金属夹杂物对高强度石油套管冲击韧性的影响[J].特殊钢,2026,47(03):137-142.

Deng Xuyan,Wang Juchao,Zhang Lingtong,et al.Effect of Nonmetallic Inclusion on Impact Toughness of High Strength Oil Casing[J].Special Steel,2026,47(03):137-142.
邓叙燕,王居超,张玲通等.非金属夹杂物对高强度石油套管冲击韧性的影响[J].特殊钢,2026,47(03):137-142. DOI： 10.20057/j.1003-8620.N250523.

Deng Xuyan,Wang Juchao,Zhang Lingtong,et al.Effect of Nonmetallic Inclusion on Impact Toughness of High Strength Oil Casing[J].Special Steel,2026,47(03):137-142. DOI： 10.20057/j.1003-8620.N250523.

摘要

采用扫描电镜和大样电解等检验方法对高强度石油套管用连铸圆坯中夹杂物的数量、尺寸、成分、形貌进行了系统分析。结果表明：中间包开浇阶段连铸圆坯中的显微夹杂物和大型夹杂物都明显高于稳定浇铸状态；在稳定浇铸状态下，连铸圆坯中的

［T.O］＜10×10

-6

，大型夹杂物的含量小于1.5 mg/10 kg。采用中间包开浇阶段连铸圆坯制成的无缝钢管冲击功波动较大，最大冲击功是最小冲击功的1.4倍，冲击功随着钢中的

［T.O］含量增大而降低。冲击功越低的试样，夹杂物的面积比越大，37 J试样的夹杂物面积比是53 J试样夹杂物面积比的2.1倍。钢中的非金属夹杂物是导致冲击功波动的主要原因。

Abstract

The number， size， chemical composition and morphology of inclusions in continuous casting billet samples were analyzed using SEM and bulk sample electrolysis for high strength OCTG steel. The results show that the micro inclusions and large inclusions in the continuous casting billets are significantly higher than the stable casting state in the biginning casting stage of the tundish.T.O content in the billet is less than 10×10

-6

， and the macro inclusion content in the billet is less than 1.5 mg/10 kg in the stable casting stage. The seamless steel pipes produced from round billets at casting start stage exhibit significant fluctuations in impact energy， with the maximum impact energy being 1.4 times the minimum. The impact energy decreases as the T.O content in the steel increases.Samples with lower impact energy show a higher area fraction of inclusions， the inclusion area fraction in the 37 J sample is 2.1 times that of the 53 J sample. Nonmetallic inclusions in the steel are the primary cause of the impact energy fluctuations.

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references

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