Oil well pipe for expansion in well and two-phase stainless steel for use as oil well pipe for expansion
A technology of duplex stainless steel and oil well pipe, applied in the field of duplex stainless steel, can solve problems such as uneven deformation
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[0068] A plurality of steels having the chemical compositions shown in Table 1 were melted to produce billets. Hot forging and hot rolling were performed on the produced billets to form a plurality of test steel plates having a thickness of 30 mm, a width of 120 mm, and a length of 300 mm.
[0069] Table 1
[0070]
[0071] The "Organization" column in Table 1 indicates the steel type of each test number. "D" means duplex stainless steel, "C" means carbon steel. "M" indicates martensitic stainless steel. Referring to Table 1, test numbers 1 to 11 and 21 to 23 are duplex stainless steels. Numbers 12 to 14 are carbon steels, and test numbers 15 to 20 are martensitic stainless steels.
[0072] The steel plates of test numbers 1 to 23 were subjected to the heat treatment and cold working described in the "heat treatment" column in Table 1. Specifically, the steel sheets of test numbers 1 to 11 were subjected to solution treatment in a temperature range of 1050° C. to 1150°...
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