The invention discloses a method for heading a high-strength
toughness titanium alloy drill rod material. A
titanium alloy drill rod is composed of, by weight, 5-7 parts of Al, 2.0-3.0 parts of Nb, 0.5-2.0 parts of Zr, 0.7-1.2 parts of Mo, 0.02-0.05 part of Fe, 0.01-0.03 part of Si and the balance being Ti. The method for heading the
drill rod material composed of the compositions includes the steps that 1, smearing of glass
powder is performed; 2,
induction heating is performed; 3, primary heading is performed; 4, secondary heating is performed; 5, secondary heating is performed; 6, heat treatment is performed on integral pipes. The method has the advantages that after the
titanium alloy drill rod material is headed, and the requirements for 110 ksi drill rod products of API standards are met, wherein mechanical properties are that the yield strength is larger than 758 Mpa,
impact toughness is larger than 41 J, and the elongation rate is larger than 11%; the
titanium alloy drill rod material can be used in a strict corroding environment that H2S
partial pressure is 5 Mpa, CO2
partial pressure is 11 Mpa, the concentration of NaCl is 100000 ppmCl, and the native
sulfur is 3 g / L. The showed capacity of resistance to
hydrogen sulfide stress
corrosion is far higher than that of a common API drill rod, and the
titanium alloy drill rod material is the optimal material replacing
carbon steel in exploitation and application of oil and gas, and meets the requirements of oil fields corroding the environment.