We have fermonic 50 high strength annealed stainless steel our own variant of xm19 is offered in a high strength option with a 100 or 120 ksi proof strength, this is achieved through warm or cold working, fermonic 50 high strength differs from xm-19 hs as these properties are maintained across the size range up to 10 inch dia., where standard xm-19 50 high strength properties are lost by 3 inch dia. Fermonic grades remains non magnetic even when.