Advanced Metalworking Solutions for
Naval Systems that Go in Harm's Way
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Optimized Commercial Steels for Naval Surface Ships

Objective

Reduce acquisition and life-cycle costs by developing and implementing optimized metalworking procedures for candidate commercial steels planned for U.S. naval surface ship applications. These procedures will result in the best steel manufacturing processes for the most cost-effective price.

Technical Approach

  • Optimize manufacturing processes to maximize the performance of ABS grade EH-36 steel plate as the sole primary hull material for the LPD-17 Amphibious Transport Ship.
  • Identify replacement commercial casting material to replace HY-80 casting material for surface ship applications. This effort requires material characterization of both HY-80 and the candidate replacement material, to ensure performance of castings under Navy-unique structural loads.
  • Develop numerical simulation techniques to accurately simulate the heat-treatment process of large complex castings. This technology will be used to optimize heat-treatment procedures to maximize performance of these castings.
  • Optimize welding, flame bending and forming procedures of ABS grade EH-36 steel plate.

Benefits

An estimated $8.8 million cost avoidance resulted with implementation of ABS grade EH-36 steel plate as the sole primary hull material for the LPD-17 ship series. Structural integrity of ABS Grade EH-36 steel plate was ensured with optimization of welding, flame bending and forming procedures. As part of the material evaluation, an improved fracture toughness based material assessment methodology was developed. This methodology enables simple, inexpensive material evaluation tests to be used to ensure that structural performance requirements are met. The Navy has used the improved technique to study several material performance issues and developed a better understanding of the issues at a reduced cost.

Implementation

Technology implementation was coordinated through the appropriate Navy program office. Transition of technology to industry was executed via users groups, technical reports and technology demonstrations. The users groups were designed to focus on related partners, such as shipyards, steel manufacturers, and Navy program offices and technical codes.

Status

Completed