Skip to Main Content
 

Global Search Box

 
 
 
 

Files

File List


ucin1226698283.pdf (2.59 MB)

ETD Abstract Container

Abstract Header

Preliminary Evaluation Of Post-Production Heat Treating Of HPS 70W Steel

Gade, Satya Sai Sravan Kumar
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1226698283

Abstract Details

2008, MS, University of Cincinnati, Engineering : Civil Engineering.
The cooperative research program launched by the Federal Highway Administration in cooperation with the U.S. Navy and the steel industry was a great success in bringing high performance steel technology to the bridge industry. The past decade has seen many developments as part of this research program, the first of them being the development of HPS-70W, a high performance steel material with yield strength of 70 ksi (483 MPa). Its high strength, better weldability, improved toughness, inherent weathering resistance and improved ease of fabrication has helped engineers and bridge owners to design and build bridges more efficiently. Significant material and cost savings have been reported in many of these bridge projects (Wright 1997). HPS-70W is the most widely used, researched and tested of the high performance steels to date. With the success of HPS-70W, an HPS version of 50 ksi (345 MPa) steel has been developed (Wilson 2003). Design specifications for bridges using these steels are being developed and continuously updated as research results are published. Hybrid girder design which incorporates the use of HPS-50W along with HPS-70W has been reported to be effective in using high performance steels for bridge construction. HPS-70W plates up to 4 in (102 mm) thick can be produced by quenching and tempering process (Q&T), but this process limits plate lengths to 50 ft (15 m). A new production technique called Thermal-Mechanical Controlled Processing (TMCP) has recently been developed that yields steel having similar properties (Lwin 2002). TMCP practices can be used to produce HPS-70W plates up to 2 in (51 mm) thick and to 125 ft (38 m) long. The present work concentrates on evaluating various post-production heat treating methods for application to HPS-70W. Methods such as heat curving, heat cambering and flame straightening are used during fabrication and repair of bridge members. There is a concern that these methods might have undesirable effects on the mechanical properties of HPS-70W. The present work focuses on evaluating the effect of these heat treating methods on the properties of HPS-70W, and determining the transition temperature, which is critical during the application of post-production heat treating methods. From the results obtained, it was concluded that post-production heat treating techniques with a limiting temperature of 1275 °F (691 °C) can be used on HPS-70W with no apparent effect on its tensile properties. A more refined approach is required to evaluate the effect on toughness properties of HPS-70W.
James Swanson, PhD (Committee Chair)
Michael Baseheart, PhD (Committee Member)
Gian Rassati, PhD (Committee Chair)
100 p.
Civil Engineering
Heat Treating; HPS-70W

Recommended Citations

Citations

  • Gade, S. S. S. K. (2008). Preliminary Evaluation Of Post-Production Heat Treating Of HPS 70W Steel [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1226698283

    APA Style (7th edition)

  • Gade, Satya Sai Sravan Kumar. Preliminary Evaluation Of Post-Production Heat Treating Of HPS 70W Steel. 2008. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1226698283.

    MLA Style (8th edition)

  • Gade, Satya Sai Sravan Kumar. "Preliminary Evaluation Of Post-Production Heat Treating Of HPS 70W Steel." Master's thesis, University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1226698283

    Chicago Manual of Style (17th edition)

ucin1226698283
779
© 2008, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.