Technology Readiness Level 5
Technology Readiness Level 5:
Advanced For Simulation Tests
The fidelity of breadboard technology increases significantly
enough to justify being ready for testing in a simulated
Lukens Steel Company produced a second melt of HSLA-100 steel,
again by electric furnace and ingot casting. Most of the plate produced from
the heat was greater than 2 inches thick, primarily for ballistic resistance
evaluation. The minimum strength and toughness requirements were met in plate
thicknesses from 1/2 to 3-3/4 inches. A double austenitization and quench
process was used for HSLA-100 steel plate in gages over 1-1/4 inches to refine
the heavy-plate grain structure for optimum toughness. HSLA-100 plate from
both productions to the interim specification was the primary material used in
the certification program.
The certification evaluation included continued characterization
of production HSLA-100 steel plate mechanical, physical, and fracture
properties. However, the main focus was the evaluation of weldability and
welding process limits for structures of high restraint, studies of fatigue
properties, and effects of marine environments on HSLA-100.
The results of low-cycle fatigue crack initiation tests of
HSLA-100 steel and weldments and high-cycle fatigue tests in air and seawater
showed properties equivalent to HY-100 steel in every case. The steels showed
similar fatigue crack growth rate properties. General corrosion, crevice
corrosion, galvanic corrosion, and high-velocity seawater parallel flow and
cavitation tests of HSLA-100 in seawater showed that the corrosion behavior of
HY-100 and HSLA-100 steels was comparable.
Aylor, D.M., R.A. Hays, R.E. Rebis, and E.J. Czyryca,
Corrosion and Stress Corrosion of HSLA-100 Steel, DTRC/SME-90/17, May
Czyryca, E.J., “Development, Qualification, and Certification of
HSLA-80 and HSLA-100 Steels for U. S. Navy Ship Construction: The Metallurgy,
Welding, and Qualification of Microalloyed (HSLA) Steel Weldments,”
Proceedings of the International Conference, Houston, Texas, November
6–8, 1990, American Welding Society, Miami, Florida, 1991.
Czyryca, E.J. and R.E. Link, Fracture Toughness of HSLA-100,
HSLA-80, and ASTM A710 Steel Plate, DTRC/SME-88/64, January 1990.
Czyryca, E.J., HSLA-100 Steel Plate Production (2nd
Production Heat), DTRC/SME-89/19, July 1989.
Czyryca, E.J., R.E. Link, and R.J. Wong, Evaluation of
HSLA-100 Steel for Surface Combatant Structural Certification,
DTRC/SME-89/15, August 1989.
Czyryca, E.J., R.E. Link, R.J. Wong, D.M. Aylor, T.W.
Montemarano, and J.P. Gudas, “Development and Certification of HSLA-100 Steel
for Naval Ship Construction,” Naval Engineers Journal, May 1990, pp.
Werchniak, W., E.J. Czyryca, and D.M. Montiel, Fatigue
Properties of HSLA-100 Steel and Weldments, DTRC/SME-89/113, September
Fatigue Test Results for HSLA-100,
HY-100, and HY-80 Steel