Production process of 8630MOD3-85K forge piece for deep sea wellhead casing hanger

Abstract

The invention discloses a production process of a 8630MOD3-85K forge piece for a deep sea wellhead casing hanger. A steel blank of the 8630MOD3-85K forge piece comprises the following chemical components in percentage by weight: 0.25 to 0.33 percent of C; 0.15 to 0.35 percent of Si; 0.7 to 1.1 percent of Mn; less than or equal to 0.015 percent of P; less than or equal to 0.01 percent of S; 0.85 to 1 percent of Cr; 0.75 to 0.99 percent of Ni; 0.35 to 0.45 percent of Mo; less than or equal to 0.25 percent of Cu; less than or equal to 0.025 percent of Ti; less than or equal to 0.01 percent of Bi; less than or equal to 0.012 percent of N; less than or equal to 0.01 percent of Nb; 0.02 to 0.035 percent of Al; less than or equal to 0.015 percent of Sn; 0.002 to 0.03 percent of V; less than or equal to 0.0005 percent of B; less than or equal to 0.01 percent of Pb; less than or equal to 0.02 percent of As; less than or equal to 0.02 percent of Sb; less than or equal to 1.6 ppm of H; less than or equal to 25 ppm of O; less than 0.833 percent of CE, and the balance Fe; and the DI value is larger than 8.0.

Description

technical field [0001] The invention relates to a production process of an 8630MOD3-85K forging for deep-sea wellhead casing. Background technique [0002] China has become the world's largest importer of crude oil and natural gas, and its dependence on foreign oil and gas is still on the rise, facing a very severe energy security situation. Vigorously developing the offshore oil and gas industry and increasing the intensity of offshore oil and gas exploration and development is not only a concrete measure to implement the central government's requirements for increasing domestic oil and gas exploration and development to ensure national energy security, but also an inevitable requirement to ensure China's energy security. As a large oceanic country, my country is rich in offshore oil and gas resources, but the overall degree of exploration is relatively low. Offshore oil and gas is an important field for long-term and substantial increase in production in my country. There...

AI Technical Summary

Problems solved by technology

[0004] For ordinary American Standard 8630 materials, the conventional chemical composition ratio and thermal processing technology are difficult to ensure that the performance requirements of the overall section of the casing hanging forgings meet the 85KSI yield strength index. The test results are carried out according to the requirements of DNVGL-RP-0034 underwater forgings There are often cases of low local strength or poor low-temperature impact toughness, especially after a post-weld simulated heat treatment process at 650 degrees for 16 hours to meet the yield strength of 85KSI

According to the general 8630 forging manufacturing process, it cannot stably pass the evaluation test required by the underwater forging specification, and cannot meet the application requirements of deep sea forgings

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