A kind of preparation method of brake pipe joint
A brake pipe and head technology, applied in the field of brake pipe joint preparation, can solve the problems of wear resistance, medium resistance, oxidation resistance, general corrosion resistance, uncompetitive cost-effectiveness, and a large number of spare parts, etc. Strength and corrosion resistance, reducing overheating sensitivity and temper brittleness, and improving hardenability
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Embodiment 1
[0033] Raw materials for steelmaking: according to the composition and mass percentage of brake pipe joints: C: 0.19%, Si: 0.10%, Mn: 0.90%, B: 0.12%, Ti: 0.055%, Al: 0.25%, Mo: 0.72%, V: 0.20%, Nb: 0.08%, La: 0.015%, P ≤ 0.02%, S ≤ 0.02%, the balance is Fe, and melted into molten steel at 1320°C. After smelting, the molten steel is poured with full protection of argon seal. And rolled into steel plate; during rolling, the rolling temperature is 1000°C, the finish rolling temperature is 900°C, the spinning temperature is 860°C, and the coiling temperature is 750°C;
[0034] Cold extrusion molding: the steel is subjected to surface pickling and derusting, limestone coating, and phosphating treatment in sequence, and then cold extrusion molding to obtain a brake pipe joint blank;
[0035] Heat treatment: heat up the brake pipe joint blank at a rate of 8 °C / min to 530 °C, then at a rate of 6 °C / min to 820 °C, and then at a rate of 10 °C / min to 1020 °C with quenching oil Quenchin...
Embodiment 2
[0038] Raw material steelmaking: according to the composition and mass percentage of the brake pipe joint: C: 0.18%, Si: 0.08%, Mn: 1.00%, B: 0.01%, Ti: 0.06%, Al: 0.22%, Mo: 0.68%, V: 0.22%, Nb: 0.05%, La: 0.012%, P ≤ 0.02%, S ≤ 0.02%, the balance is Fe, and melted into molten steel at 1340°C. After smelting, the molten steel is poured with full protection of argon seal. And rolled into steel plate; during rolling, the rolling temperature is 990°C, the finish rolling temperature is 890°C, the spinning temperature is 870°C, and the coiling temperature is 755°C;
[0039] Cold extrusion molding: the steel is subjected to surface pickling and derusting, limestone coating, and phosphating treatment in sequence, and then cold extrusion molding to obtain a brake pipe joint blank;
[0040] Heat treatment: heat up the brake pipe joint blank at a rate of 9 °C / min to 535 °C, then at a rate of 6 °C / min to 800 °C, and then at a rate of 12 °C / min to 1040 °C with quenching oil Quenching tr...
Embodiment 3
[0043] Raw materials for steelmaking: according to the composition and mass percentage of brake pipe joints: C: 0.18%, Si: 0.11%, Mn: 0.88%, B: 0.08%, Ti: 0.05-0.06%, Al: 0.28%, Mo: 0.75 %, V: 0.18%, Nb: 0.008-0.14%, La: 0.018%, P≤0.02%, S≤0.02%, the balance is Fe, and melted into molten steel at 1310 ° C, the molten steel is smelted and sealed with argon Full protection pouring, and rolling into steel plate; rolling temperature is 1010°C, finish rolling temperature is 905°C, spinning temperature is 855°C, coil collection temperature is 745°C;
[0044] Cold extrusion molding: the steel is subjected to surface pickling and derusting, limestone coating, and phosphating treatment in sequence, and then cold extrusion molding to obtain a brake pipe joint blank;
[0045] Heat treatment: heat up the brake pipe joint blank to 525°C at a rate of 8°C / min, then to 850°C at a rate of 7°C / min, and then to 990°C at a rate of 9°C / min with quenching oil Quenching treatment, heat preservation...
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