Peng Jun,Li Danyang,Ding Lei,et al.Development of a New Type L80 Grade 13Cr Martensitic Oil Well Pipe[J].Special Steel,2025,46(06):90-94. DOI: 10.20057/j.1003-8620.2024-00199.
Development of a New Type L80 Grade 13Cr Martensitic Oil Well Pipe
In order to meet the demand of Grade L80 13Cr oil well pipe in coexistin
g corrosion environment of CO
2
and H
2
S, a new type of L80 steel grade 13Cr material was developed by adding Ni, Mo, V, Nb and other alloy elements, and the heat treatment process of 920 ℃-960 ℃ air quenching 700 ℃-750 ℃ high temperature tempering process was optimized and the evaluation test of corrosion resistance of materials under different corrosion resistant environments was carried out.The test results showed that mechanical property and the sulfide stress cracking resistance of the developed new type 13Cr oil well pipe met the requirements of API 5CT Grade L80 13Cr standard,It met the user's requirements of high Cl
-
concentration and trace H
2
S corrosion environment. In the electrochemical test of CO
2
corrosion, Grade L80 13Cr had a high open circuit potential -184 mV, and the coupling test with 1Cr carbon steel, the average galvanic current reaches 1.6μA/cm
2
, and had good corrosion resistance.
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references
Masamura K , Inohara Y , Minami Y , et al . Estimation models of corrosion rates of 13Cr alloys in CO 2 environments [J]. Corrosion 99 [C]. San Antonio, Tx : NACE International ,1999. 583 .