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Alloy K-500 (UNS N05500) is concomitantly a centurial material and the very first precipitation-strengthened nickel-based alloy, then developed in the 1920s by the newly-formed International Nickel Company, or Inco. Derived from Monel 400 (UNS N04400) that was invented in 1901, Alloy K-500 shares many of the same corrosion and tribological characteristics. Being a pioneer alloy with so-called “stain-less” characteristics, AlloyK-500 also established itself as the first high-strength oilfield nickel alloy, having survived sour service conditions exceeding the capabilities of the low-alloy steels of the time. From early naval propeller shaft applications togeneral cross-industrial uses, Alloy K-500 has always been considered a corrosion-resistant alloy, or CRA. For instance, it has been included in the NACE MR1075 document right from the first 1975 edition.
A powerful way to study hydrogen embrittlement at a local scale is by Scanning Kelvin Probe Force Microscopy (SKPFM). This technique by measuring the surface potential at the nanometer scale allows the detection and localization of hydrogen in the alloy.
检测、修补和缓解炼厂压力容器在湿H2S环境下发生开裂的
DOWNLOADABLE HISTORICAL DOCUMENT. Detection, repair, and mitigation of cracking of carbon steel pressure vessels, including columns, heat exchangers, drums, reboilers & separators in wet H2S petroleum refinery environments.
Guidelines to prevent environmental cracking of weldments in carbon steel refinery equipment and piping. Welding processes: SMAW, GMAW, FCAW, GTAW and SAW.
Water wall tubes from boiler operating for 14 years were subject to repeated failures ranging from pinholes to cracks and ruptures. A failure analysis on a received tube was carried out including destructive and non-destructive testing.
Recent results of sour gas and hydrogen embrittlement testing of CW N07022 alloy will be presented. The test results of CW N07022 alloy will demonstrate that it offers superior properties to precipitation-strengthened Ni-base alloys for demanding oil and gas applications.
Guías para prevenir formas de agrietamiento ambiental en uniones soldadas de equipos de acero al carbón en refinerías - recipientes presión, intercambiadores de calor, tuberías, cuerpos de válvulas y carcazas de bombas y compresores.
Guidelines to prevent most forms of environmental cracking of weldments in carbon steel refinery equipment and piping. Processes covered: SMAW, GMAW, FCAW, GTAW, SAW.
Today hydrogen for use as fuel for vehicles is getting more and more attention as an alternative to vehicles using fossil-based fuels. Hydrogen is used in both electric fuel cell cars and in heavy vehicles using direct combustion of hydrogen. Such vehicles require stainless tubing for transport of the hydrogen and for bosses to composite tanks in addition to tubing and fittings in hydrogen fueling stations.
Several offshore field failures in recent years have been attributed to Hydrogen Induced Stress Cracking (HISC) of high strength, highly corrosion resistant Precipitation Hardened Nickel Alloys (PHNA’s) such as UNS N07716, UNS N07718 and UNS N07725.
Hence, HISC is a constant concern regarding subsea components subjected to high tensile stress, and the industry is searching for solutions to their technical needs: High strength corrosion resistant alloys (CRA’s) resistant to seawater (high Pitting Resistance Equivalent number (PREN)) but also resistant to HISC.
For PHNA’s, improved processing (chemical composition limits and processing temperatures) and improved quality control methods as well as refined acceptance criteria are all under consideration.