LTV Steel has developed a new hot rolled product with a minimum yield strength of 100 ksi. LTV100XF-HR is a controlled rolled HSLA steel produced at Indiana Harbor Works. It is formable and weldable, with good toughness.

The high strength properties are achieved through a combination of grain size, precipitation and microstructural hardening. The low sulfur content with inclusion shape control and controlled rolling contribute to good formability and toughness at this strength level.

Applications
Typical applications for LTV100XF-HR are truck frames, crane booms, mobile equipment, agricultural machinery and rail cars. The product can be used to replace other high strength steels with a weight saving proportional to the increased strength, if rigidity is not an issue.

LTV100XF-HR can be supplied in coil form or as tension leveled, temper rolled sheets. Other processing may be available through an outside processor.

Weldability
LTV100XF-HR can be welded using typical gas-metal arc (GMA) practices. Although they are not required, pre and postheating practices are recommended. Preheating to 100º F (38º C) is recommended if the steel is much below 77º F (25º C).

Postheating should be conducted after welding and involves slow cooling the welded material to 105º F (65º C) followed by air cooling to ambient. To ensure good welds, low hydrogen consumables and practices should be used. It is also recommended that welds not be placed in regions of high stress.

Formability
LTV100XF-HR exhibits good low cycle fatigue performance in comparison with heat-treated steels of similar strength. LTV100XF-HR cyclically strain hardens in low-cycle fatigue testing, unlike quench and tempered steels which become softer.

Technical Assistance
For additional information and assistance, please contact LTV. Our Sales Representatives and Metallurgical Service Engineers are ready to assist you in deciding whether LTV100XF-HR can be used in your application.