The invention provides a
processing method for a small-size and high-strength
niobium-
hafnium alloy bar. The
processing method comprises the following steps that 1, a
niobium-
hafnium alloy ingot blank is sawn, and after being heated, the sawn
niobium-
hafnium alloy ingot blank is coated with an anti-oxidative protective
lubricant; 2, the niobium-hafnium alloy
ingot blank coated with the anti-oxidative protective
lubricant is forged through upsetting and stretching to obtain a bar billet; 3, the bar billet is sequentially turned, ground and vacuum-annealed for the first time; 4, the vacuum-annealed bar billet is heated, the heated bar billet is coated with an anti-oxidative protective
lubricant, and the bar billet coated with the anti-oxidative protective lubricant is formed through die
forging to obtain a
forging stock; 5, the
forging stock is sequentially turned, ground and vacuum-annealed for the second time; 6, the vacuum-annealed forged stock is rolled with grooved rolls to obtain a small-size bar billet; and 7, the small-size bar billet is sequentially straightened, scalped, polished, pickled and annealed to obtain the small-size and high-strength niobium-hafnium alloy bar. The
diameter of the section of the bar obtained according to the
processing method is 8-20 mm, the
room temperature tensile strength of the bar is up to above 465 MPa, the yield strength of the bar is up to above 350 MPa, the elongation of the bar is above 47%, and the
grain structure of the bar is fine and uniform.