Preparation method for manufacturing low-cost ultrafine grain transformation-induced plastic steel seamless tube online
A technology of phase change induced plasticity and ultra-fine grain, which is applied in the field of steel pipe preparation, can solve the problems of no further detailed analysis of the mechanical properties of grain ultra-fine, difficult process control, complex process, etc., to achieve low cost, Process stability and the effect of increasing the grain boundary area
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[0046] Example 1
[0047] The chemical composition of the steel selected in this embodiment is C: 0.101%, Si: 1.80%, Mn: 1.09%, P: 0.002%, S: 0.005%, and the balance is Fe in terms of mass percentage. A measured by the thermal expansion curve c1 And A c3 They are 721 and 849°C, respectively. The A c1 Is the starting temperature of ferrite to austenite transformation during annealing heating, A c3 It is the end temperature of ferrite to austenite transformation during the annealing heating process. Due to the different composition of steel (such as changes in carbon content, silicon content, etc.) and changes in process parameters (such as heating rate), A c1 A c3 Will change accordingly. The steel used in the present invention has its A measured from the thermal expansion curve c1 And A c3 .
[0048] The smelted ingot is forged into a bar. The bar is turned to remove wrinkles and defects on the outer surface to form a tube blank. The tube blank is heated to 1100°C and held for 2 ...
Example Embodiment
[0057] Example 2
[0058] The chemical composition of the steel selected in this embodiment is C: 0.16%, Si: 1.35%, Mn: 1.51%, P: 0.005%, S: 0.007%, and the balance is Fe. A measured by the thermal expansion curve c1 And A c3 They are 735 and 870°C, respectively.
[0059] The smelted ingot is forged into a bar. The bar is turned to remove wrinkles and defects on the outer surface to form a tube blank. The tube blank is heated to 1100°C and held for 2 hours, then pierced, and then cooled to room temperature. The tube blank is cold drawn in 4 passes to obtain a seamless cold drawn steel pipe with a wall thickness of 2.1 mm and an outer diameter of 53 mm.
[0060] The seamless cold drawn steel pipe is heated by an intermediate frequency heating induction coil for 4 cycles + quenching. The specific annealing process parameters are shown in Table 2. The heating rate is about 400℃ / s and the annealing temperature (A c3 -40℃)~(A c3 +10℃), annealing time is 5~15s. The annealed seamless cold...
Example Embodiment
[0066] Example 3
[0067] The chemical composition of the steel selected in this embodiment is C: 0.184%, Si: 1.00%, Mn: 1.87%, P: 0.006%, S: 0.003%, and the balance is Fe. A measured by the thermal expansion curve c1 And A c3 They are 730 and 850°C respectively.
[0068] The smelted ingot is forged into a bar. The bar is turned to remove wrinkles and defects on the outer surface to form a tube blank. The tube blank is heated to 1200°C and held for 2 hours, then pierced, and then cooled to room temperature. The tube blank is cold drawn in 4 passes to obtain a seamless cold drawn steel pipe with a wall thickness of 1.20 mm and an outer diameter of 43 mm.
[0069] The seamless cold drawn steel pipe is heated by an intermediate frequency heating induction coil for 4 cycles + quenching. The specific annealing process parameters are shown in Table 3. The heating rate is about 300℃ / s and the annealing temperature (A c3 -40℃)~(A c3 +10℃), annealing time is 5~10s. The annealed seamless col...
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