Abstract
To reduce PCM value for prevention of cold cracking in girth welding and for sour environment service, low carbon steel is required. Strengthening of low carbon steel necessitates microstructural change from ferrite-pearlite to low temperature transformation products. Microalloying technique and dynamic accelerated cooling process after controlled rolling were applicable to develop low PCM high grade line pipe steel. Lowering nitrogen content is very preferable to make boron effective.From the metallurgical studies of microalloying, low G-Nb-Ti-B steel was developed.The HAZ toughness was improved by adding small amount of titanium. The risk of hot cracking was decreased by lowering carbon content. The hardenability of new type steel was considered by the effective boron contents. The P*CM formula was newly developed. The strength can be obtained with extremely low PCM level in boron treated new type steels, resulting low hardness in the HAZ.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Transactions of the Iron and Steel Institute of Japan
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
