Welding of AISI 4130 and 4140 steels for drilling system
The use of AISI 4130 and 4140 (chromium-molybdenum) steels in the offshore oil and gas industry is mainly confined to drilling facilities such as mud and cement systems and well-head equipment. Both AISI 4130 and 4140 steels have high carbon contents plus additions of chromium and molybdenum and, depending on the heat treatment applied, have strength levels in excess of 774 N/mm{sup 2}. These steels are capable of withstanding the high pressure experienced during drilling operations, i.e., 10--15 ksi plus, depending on wall thickness. Welding AISI 4130 and 4140 steels is not difficult, provided welding procedures and subsequent postweld heat treatment (PWHT) are carried out in accordance with approved procedures. This article outlines the welding and PWHT of AISI 4130 and 4140 steels for mud and cement system pipe work installed in offshore drilling and production facilities. It also reviews the properties achieved after PWHT at various temperatures and includes problems experienced during fabrication.
- OSTI ID:
- 500908
- Journal Information:
- Welding Journal, Journal Name: Welding Journal Journal Issue: 6 Vol. 76; ISSN 0043-2296; ISSN WEJUA3
- Country of Publication:
- United States
- Language:
- English
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