Thermo-mechanical processing of low-carbon high-yield strength steels -- 100 ksi yield strength steels
- Dresser-Rand Co., Painted Post, NY (United States)
- Lehigh Univ., Bethlehem, PA (United States). ATLSS Center
Thermomechanical controlled processing (TMCP) has proved useful in raising the strength level of HSLA steels and therefore enabling the use of carbon contents in the range 0.04 to 0.08% for improved fabricability. Controlled rolling followed by direct, in-line quenching and subsequent tempering (CRDQ) is an efficient type of TMCP but which would require new expensive facilities in the United States. This study was undertaken to explore the consequences of controlled rolling followed by offline heat treatment (CRAQ), which can be performed on existing United States facilities. The responses of several heats of steels ranging from 90 to 130 ksi minimum yield strength were examined, all in one-inch thick plates for the initial testing. The CRDQ treatment raised yield strengths about 15% over those of conventional hot rolling plus heat treatment (HRAQ). The off-line CRAQ treatments provided a lesser increase in strength and with less consistency. From metallographic studies it was apparent that controlled rolling produces a directional microstructure that occasionally resulted in splitting in CRDQ tensile test fractures in a plane parallel to the plate. This directional condition was largely obliterated by reaustenitizing. This study supports the possibility that controlled rolling combined with off-line heat treatment offers comparable advantages to in-line processing without the expensive installation entailed. Further study is required to optimize the chemical composition and processing practices.
- OSTI ID:
- 234236
- Report Number(s):
- CONF-951026--; ISBN 0-87170-555-9
- Country of Publication:
- United States
- Language:
- English
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