Patent ID: 8007601

Claim:
A tubular bar, comprising: an elongate hollow body extending between a first end and a second end defining an outer surface and an inner surface; wherein the elongate hollow body comprises a steel alloy consisting essentially of: about 0.13 to 0.35% carbon; about 0.8 to 2.0% manganese; about 0.10% to 0.70% silicon; about 0.01% to 0.07% aluminum; up to about 0.50% nickel; up to about 0.50% chromium; up to about 0.25% molybdenum; up to about 0.05% niobium, and up to about 0.30% vanadium; wherein the elongate hollow body as quenched without subsequent heat treatment has a fatigue life of greater than about 300,000 cycles as measured under laboratory testing when the region about at least one bend formed in the elongate hollow body is subjected to cyclic stresses above about 450 MPa.