What Does Alloy Plate 4140 HTSR Stand For?

HTSR stands for Heat Treated, Stress Relieved. For alloy steel plate 4140, it’s usually delivered as rolled, or prehard (Q+T) condition. But some customer will need it inside stress relieved. Then 4140 plate is heat treated, reduce brittleness and relieve any stress fractures throughout the 4140 steel plate or flat bar.