Ingeniero

THE NATIONAL
SHIPBUILDING
RESEARCH PROGRAM

EVALUATION OF THE
BENEFITS OF HSLA STEELS

Cooperative Effort by:
Maritime Administration of the U.S. Department of Transportation
Bethlehem Steel Corp., Marine Division, Newport News Shipbuilding and
Drydock Co., and Ingalls Shipbuilding, Inc.

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Evaluation of the Benefits of HSLA Steels

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Naval Surface Warfare Center CD Code 2230 -Design Integration Tools
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Standard Form 298 (Rev. 8-98)
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FOREWORD

The need for ships and oil well drilling equipment to operate in theextremes
of polar climates has given emphasis to the need for high toughness, weldable
steels.

Important weight savings become available where designs currently use

normalized, medium strength, low alloy steels.

Significant cost savings

become available if the new steels permit higher production rate welding in
heavy fabrication.

One of the objectives of this study was toprocure plate sections of ASTM A710
steel in yield strength levels of 80 KSI (80,000 pounds per square inch) and
also ASTM A710 modified in chemistry to yield strengths of 100 KS I minimum
yields. Plates to over 5 inch thick in both strength levels were procured and
welding was performed to evaluate producibility for shipbuilding and marine
structures. Effects of high heat welding on heat affectedzones (HAZ)
toughness was of primary interest.

Conventionally used quenched and tempered steels, such as HY80 and HY1OO,
require preheat and interpass temperature controls during welding of plates
thicker than 1/2 inch to prevent cracking and loss of toughness in weld metal
and in base metal HAZ.
welded structures.

The problem is more severe with greater thickness in

High strengthlow alloy steel with added copper for

precipitation strengthening (aging) and added nickel for toughness, has been
developed and is available in plates as ASTM A710 in several grades. This
material has excellent low temperature toughness and unique resistance to HAZ
embrittlement and hydrogen-induced cracking, even with little or no preheat
for welding.

With minor variations in...