TECHBRIEF 
This report is an archived publication and may contain dated technical, contact, and link information 

Publication Number:
FHWAHRT11061
Date: July 2011 

Improved CorrosionResistant Steel for Highway Bridge ConstructionFHWA Contact: Paul Virmani, HRDI60, (202) 4933052, This document is a technical summary of the Federal Highway Administration report, 
Figure 1. Graph. Average Charpy Vnotch absorbed energy values for experimental steels tempered to achieve yield strength greater than 50 ksi (344.5 MPa).
This bar graph shows the average Charpy Vnotch (CVN) absorbed energy values for experimental steels tempered to achieve a yield strength (YS) greater than 50 ksi (344.5 MPa). CVN is plotted on the yaxis ranging from 0 to 180 ftlb (0 to 24.9 mkg) in increments of 20 ftlb (2.7 mkg). Test temperature in Fahrenheit is on the xaxis with four test temperatures: 70, 40, 10, and 10 ºF (21.11, 4.44, 12.22, and 23.33 ºC). In the 10 ºF (12.22 ºC) portion, there are two horizontal lines: one at 30 ftlb (4.15 mkg) designated fracture critical (FC) and one at 20 ftlb (2.77 mkg) designated nonfracturecritical (NFC). Different colored bars at each test temperature represent steels 11Cr, 9Cr, 9Cr2Si, 7Cr2Si, 7Cr2Al, and 5Cr2Si2Al. At all temperatures, the bar for steel 11Cr is significantly higher than any of the other steels. At 70 ºF (21.11ºC), the 11Cr bar is 154 ftlb (21.3 mkg), the 9Cr bar is 61 ftlb (8.43 mkg), the 9Cr2Si bar is 46 ftlb (6.36 mkg), and the 7Cr2Si bar is 34 ftlb (4.70 mkg). The bars for 7Cr2Al and 5Cr2Si2Al are short at 4 and 3 ftlb (0.55 and 0.41 mkg), respectively. At 40 ºF (4.44 ºC), the 11Cr bar is 118 ftlb (16.32 mkg), the 9Cr2Si bar is 32 ftlb (4.43 mkg), the 7Cr2Si bar is 19 ftlb (2.63 mkg), and the 9Cr bar is 7 ftlb (0.97 mkg). There are no data for the 7Cr2Al or 5Cr2Si2Al steels at 40,
10, and 10 ºF (4.44, 12.22, and 23.33 ºC). At 10 ºF (12.22 ºC), the 11Cr bar is 109 ftlb
(15.07 mkg), and the 9Cr, 9Cr2Si, and 7Cr2Si bars are between 3 and 8 ftlb (0.41 and
1.11 mkg). At 10 ºF (23.33 ºC), the 11Cr bar is the only one shown at 85 ftlb (11.76 mkg).
Figure 2. Graph. Summary of 5 percent NaCl cyclic corrosion test results.
This bar graph provides a summary of 5 percent sodium chloride (NaCl) results. Thickness loss is plotted on the yaxis ranging from 0 to 60 mil (0 to 1,524 microns) in increments of 10 mil (254 microns). Cyclic corrosion cycles is plotted on the xaxis ranging from 0 to 100 cycles in increments of
20 cycles. Eight data series are plotted, each with a distinctive symbol and color, representing the steels under study. All the lines are approximately linear and begin at the bottom left upward to the right. The highest line is labeled A588, and it reaches 52.4 mil (1,330.96 microns) after
100 cycles. The next highest line is labeled 7Cr2Si, and it reaches 31.3 mil (795.02 microns) after 100 cycles. The next highest line is labeled 5Cr2Si2Al, and it reaches 28.1 mil
(713.74 microns) after 100 cycles. The fourth highest line is labeled 9Cr2Si, and it reaches
21.7 mil (551.18 microns) in 100 cycles. The fifth and sixth highest lines are coincident and are labeled 7Cr2Al and 9Cr. They reach 15.2 and 14.8 mil (386.08 and 375.92 microns) after
100 cycles. The lowest lines are essentially coincident, and they are labeled 11Cr and A1010. They reach only 6.5 and 4.7 mil (165.1 and 119.38 microns) after 100 cycles.
Topics: research, infrastructure, structures Keywords: research, structures TRT Terms: research, infrastructure, Facilities, Structures Updated: 09/28/2011
