Φ244.48mm×13.84mm R95套管拉伸性能和几何尺寸超标原因分析
Reason Analysis on Non-conformity of Tensile Property and Geometric Dimension of Φ244.48 mm×13.84 mm R95 Casing
王冬林 1霍轩 2马鑫 2钟琦 3唐浩宇 3闫凯1
作者信息
- 1. 中国石油集团工程材料研究院有限公司 陕西 西安 710077
- 2. 中国石油煤层气有限责任公司北京物资分公司 陕西 西安 710082
- 3. 中国石油西南油气田公司物资分公司 四川 成都 610031
- 折叠
摘要
某公司生产的Φ244.48 mm×13.84 mm R95 套管热处理后出现批量性力学性能超标和几何尺寸不合格现象,主要表现为屈服强度大于标准值,不合格率90%;外径普遍增大0.23～0.56 mm,但未超标;壁厚减少0.05～0.21 mm,30%超标;10%椭圆度超过2 mm;10%管端直度超标.经分析,屈服强度不合格主要由回火炉温度控制不均匀、回火温度过低、回火保温时间不够等因素综合引起;外径、壁厚淬火后数值增大、回火后数值减小主要是由热处理组织变化以及淬火、回火影响程度不同而决定;椭圆度超标是由于管端长时间高温受热而发生了"坍塌";直度不合格主要是热处理后套管发生了形状畸变而导致.针对屈服强度超上限和尺寸变化,提出了解决措施及建议,保证了Φ244.48 mm×13.84 mm R95 套管后续生产质量.
Abstract
After heat treatment of Φ244.48 mm×13.84 mm R95 casing produced by a company,the phenomena of batch non-conformity of mechanical properties and geometrical size appeared.The yield strength was greater than the standard value with an unqualified rate of 90%.Theouterdiametergenerally increased by0.23～0.56 mm but not exceed the standard.The wall thickness reduced by 0.05～0.21 mm,which resulted in an exceeding standard rate of 30%.Ovality of 10%of the casing exceeded 2 mm and end straightness of 10%of the batch exceeded standard.Through analysis,the unqualified yield strength is mainly caused by the integrated factors such as uneven furnace temperature,too low tempering temperature,insufficient tempering holding time and so on.The values of outer diameter and wall thickness increase after quenching and decrease after tempering mainly due to the change of heat treatment microstructure and the different effects of quenching and tempering.The phenomenon of"burning down"occurred at the end of the tube which was heated at high tempera-ture for a long time.The unqualified straightness after heat treatment is mainly caused by the shape distortion of casing after heat treatment.In view of the yield strength exceeding the upper limit and the size change,the measures and suggestions are put forward to ensure the quali-ty of Φ244.48 mm×13.84 mm R95 casing in subsequent production.
关键词
R95套管/热处理/屈服强度/回火/几何尺寸Key words
R95 casing/heat treatment/yield strength/tempering/geometric dimension引用本文复制引用
基金项目
中国石油天然气集团有限公司基础研究和战略储备技术研究项目(2021DQ032022Z-12)
出版年
2024
NETL
NSTL
万方数据