USX <X> UNIT RAISES SOME STEEL PRICES USX Corp said its USS steelmaking division increased prices on plate and H-pile products. Effective with May three shipments, it said the price base on carbon and high-strength low-alloy, or HSLA, H-piles will increase by 1-1/2 cts per pound. Effective with shipments beginning June 28, the price on carbon, HSLA, and alloy plates will increase by 1-1/4 cts per pound. Strip mill plate prices will rise by 3/4 cts per pound. It said the price increases on plate and H-pile products will apply to all shipments from USS plants.