Preparation of seamless special-shaped steel pipe for low temperature resistance oil derrick electric transmission pole tower
A technology for special-shaped steel pipes and seamless steel pipes, which is applied in furnace types, manufacturing tools, heat treatment equipment, etc., can solve problems such as poor comprehensive mechanical properties, high manufacturing costs, and poor welding process performance, achieve good comprehensive mechanical properties, and improve the overall Quality level, good welding manufacturability
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[0063] The invention relates to a method for manufacturing a seamless special-shaped steel pipe for a low-temperature resistant petroleum derrick power transmission tower, which is manufactured by adopting an integral seamless steel pipe round tube billet through annealing heat treatment, a hydraulic shaping cold drawing process, and a finished product heat treatment process.
[0064] The weight percentages of the chemical elements in the overall seamless steel tube blank material are: C0.15-0.18%, Mn 1.4-1.6%, Si 0.2-0.5%, trace elements V 0.02-0.06%, Nb0.015-0.06 , Ti 0.02-0.06% and Al 0.02-0.05%, the balance is Fe and inevitable impurities S≤0.020%, P≤0.020%, N≤0.020%, the specific process steps are as follows:
[0065] Step one, annealing heat treatment
[0066] Annealing heat treatment hot-rolled steel tube billet, annealing temperature 850~880℃, holding time 30 minutes, air cooling,
[0067] Due to the inhomogeneity of hot-rolling and cooling, the hot-rolled steel tube has a...
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