用于 API 6A 和 API 17D 应用的高温井口设备的金属材料限制（第二版

[中文适用范围]： Testing was performed in four phases@ presented herein in chronological order as Phase I@ Phase II@ Phase III@ and Phase IV. Initially@ all testing was to be completed in two phases@ but testing anomalies in Phase II prompted re-testing of some alloys in Phase III and later in Phase IV. Alloy candidates were recommended by AWHEM membership for analysis and confirmed by API??s approval of New Work Item No. 2003-100786 in June 2002. Several material suppliers and several AWHEM member companies donated material for testing. Metallurgists on the task group screened material certificates to ensure a ??normal?? chemistry without enhancements for the material candidates listed in Table 1@ Table 2@ and Table 3. Another API New Work Item approved in 2014 covered a new round of testing of austenitic precipitation-hardened stainless steel ASTM A453 Grade 660 Class D (see Table 4). Three mills donated the material for testing. A summary of the yield strength derating factors from testing of the 11 alloys is provided in Table 5 and compares favorably with the available data from literature@ as provided in Ta ble 6. Alloy chemistries from the material certificates for each of the supplied alloy candidates are provided in Table 7 through Ta ble 18@ located at the end of the text portion of this report for readability [外文原描述]： This document examines mechanical properties of metallic materials used for API 6A and 17D wellhead equipment for service above 250ºF. A total of eleven different alloys meeting API 6A, PSL 3 conditions were supplied “in condition” by a variety of suppliers. Materials in this test program included alloys common to the oil and gas industry. The alloys tested included low alloy steels, martensitic, precipitation hardened and duplex stainless steels, and nickel alloys. Yield strength reduction ratios at temperatures of 300, 350 , 400, and 450 ºF are reported. As a result of testing, yield strength reduction ratios at 300ºF to 450ºF ranged from 92% to 87% for the low alloy steels, 92% to 88% for the martensitic stainless steels 81% to 73% for super duplex, 99% to 89% for the precipitation hardened stainless steel and 94% to 89% for the nickel alloys. The reported results represent an average over the different heats for each type of material. These results are intended to expand the