.... The severity of the sour environment was proposed based on the hydrogen permeability and the susceptibility for hydrogen assisted environmental cracking. Sour environment Hydrogen HIC SSC Linepipe INTRODUCTION In oil and gas industry, oil country tubular goods (OCTG) or linepipes are exposed to wet...

...Abstract TMCP (Thermo-mechanical controlled process) large diameter linepipes have been used since a long time for high-strength and severe sour application, but recently Sulfide Stress Cracking (SSC) caused by local hard zones has become a concern. In this paper, material design concept...

...sour environment HIC hydrogen permeability in-situ ultrasonic inspection linepipe INTRODUCTION In the oil and gas industry, oil country tubular goods (OCTG) or linepipes are exposed to wet H₂S environments (Sour environments) in some cases. The presence of H₂S...

...Generally, the microstructures of linepipe steels can be divided into the following fundamental Abstract Large diameter TMCP (Thermo-Mechanically Controlled Process) pipelines have recently shown detrimental local variations in mechanical properties. Additionally, industry experience demonstrated...

...Abstract The susceptibility to Stress Corrosion Cracking (SCC) of Grade X80 linepipe steels was investigated in near neutral pH conditions in comparison with a conventional Grade X65 linepipe. SCC properties were evaluated by cyclic loading tests, constant load tests and Slow Strain Rate Tests...

... by chromium carbide precipitation during girth welding. supermartensitic stainless steel (SMSS) intergranular stress corrosion cracking (IGSCC) sensitization stress corrosion cracking (SCC) linepipe girth welding heat affected zone (HAZ) carbide chromium depletion strain aging aging index...

... of IGSCC in high grade SMSS is chromium depletion, as in lean grade. supermartensitic stainless steel (SMSS) intergranular stress corrosion cracking (IGSCC) sensitization stress corrosion cracking (SCC) linepipe girth welding heat affected zone (HAZ) carbide chromium depletion INTRODUCTION Low...

... accompanied by re-precipitation of chromium carbide during girth welding. supermartensitic stainless steel intergranular stress corrosion cracking (IGSCC) sensitization stress corrosion cracking (SCC) linepipe girth welding Low carbon martensitic stainless steels, which are called supermartensitic...

... should be supplied. This includes the seam weld if applicable for the pipe to be pre-qualified. Abstract Various grades of weldable supermartensitic linepipe steels are available. The assessment needed to ensure suitability for the conditions to which they are to be exposed has been considered...

... of the present study was to generate this data and lead to the creation of a much needed industry practice allowing less stringent hardness requirements for process wetted surfaces in sour service production. Pipeline Grades Several grades of linepipe steel were selected to be representative of industry wide...

... martensite and retained austenite. The proportions were estimated by combination of dilatometry and X-ray diffractometry. Abstract Effect of microstructure on corrosion resistance of a martensitic stainless linepipe material was surveyed from viewpoint of sulfide stress cracking (SSC) and carbon dioxide...

.... Abstract HIC tests were performed for eight types of X65 linepipes in various environments in which H₂S partial pressures were in the range of 1x10⁻⁵ to 0.1MPa and pH was in the range of 2 to 5. The conditions governing HIC occurrence were investigated and the following results...

... linepipes of carbon or low alloy steels. Figure 2 shows the general characteristics of these welding processes and the performance of weldment. Compared with the SAW of fusion welding, the heat input is lower and weld pool is shorter in LASER welding. No microsegregation occurs in the LASER weld metal due...

... bearing steel was slightly lower than that of the Cr-free steel. This fact is attributed to the difference in corrosion film created on the corrosion surface. The linepipe steel with the Cr content of 0.5 % proved to have sulfide stress corrosion cracking resistance as large as the sour resistant...

...Abstract The effects of environmental factors such as temperature, oxygen content, solution chemistry and flow rate on CO₂ corrosion of linepipe steel were investigated. The corrosion rate of steel was affected by test solution chemistry, oxygen content. The corrosion rate of steel...

...Abstract The "full ring" test has been recently developed as an intermediate type of test between small coupon tests and full scale testing under internal pressure in order to evaluate a linepipe for sour service conveniently. Factors of this test and their effects on test conditions or results...

... with the corrosion rate. Steel heat-treatment microstructure carbon dioxide linepipe iron carbonate aqueous corrosion scale formation activation energy pH CO₂ partial pressure stability diagram INTRODUCTION The traditional practice of avoiding condensation of an aqueous phase in pipelines...

...Steel carbon dioxide linepipe iron carbonate aqueous corrosion scale formation heat-treatment activation energy pH CO₂ partial pressure stability diagram INTRODUCTION Most oil and gas production has associated water production with which carbon dioxide forms weak but corrosive...

...* Presently employed as a Metallurgical Consultant with Marshall Marlow Associates Ltd. Standard Test Methods Abstract This paper covers the development of a linepipe steel for sour gas service and its qualification testing for the Miller Gas Transmission System in the North Sea. The testing...

... and metallurgical factors. INTRODUCTION HIC HSCC Laboratory Fullscale-Tests Linepipe Sour Gas Abstract This report describes the results of a joint research programme carried out by the members of the European Pipeline Research Group (EPRG). The preliminary part of the programme consisted of five HIC...