Advanced Metalworking Solutions for
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Extended Metallurgical and Manufacturing Evaluation of High Strength and Toughness Steel

Objective

Prepare shipyards for the implementation of the new steel by identifying potential issues early in the development and optimization stages, thereby reducing risk and incorporating the knowledge into implementation procedures.

Background

Related projects such as “High-Strength and Toughness Naval Steels for Ballistic Protection” have identified high-strength steels as potential candidates for providing increased structural strength at reduced weight. This project will investigate how to optimize the steels for desired characteristics, predict the effects of various factors on mechanical properties and performance and develop a better understanding of specific manufacturing issues related to shipyard use.

Technical Approach

An Integrated Project Team (IPT) will perform extensive metallurgical evaluations, investigate heat treatments, evaluate hot and cold forming effects, verify magnetism effects and ultimately recommend fabrication procedures based on its findings.

Benefits

Provided that the improved HSLA-115 material retains or exceeds material performance levels relative to the currently used HSLA-100 material, the thickness of the steel plating can be reduced to achieve the desired weight reduction. This thickness reduction should result in a 400 long ton weight reduction and a lower center of gravity. In addition, by investigating manufacturing issues, such as forming and dimpling effects in addition to the metallurgical aspects of candidate materials, risk should be reduced regarding the successful implementation.

Implementation

The project consists of a multifaceted IPT with the Navy Metalworking Center working closely with PMS 378; the Naval Surface Warfare Center, Carderock Division; Mittal Steel USA; the Navy Joining Center; Naval Sea Surface Command; QuesTek Innovations, L.L.C.; and Northrop Grumman Newport News (NGNN). NGNN is the task lead for forming and dimpling validation testing at the shipyard. The implementation plan supports the larger S1066 High Strength and Toughness Naval Steels for Ballistic Protection project and is targeted to satisfy the design and construction schedule requirements for the production of CVN-78.

Status

Completed

Stakeholder

LCDR Brian A. Metcalf
CVN-78 Advanced Technology Manager
PMS 378 Future Carrier Program Office