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Steel tube machining method with high yield

A processing method and technology of yield rate, applied in the field of steel pipe processing with high yield rate, can solve problems such as low yield rate, achieve high quality, stable performance, and increase the elongation coefficient

Inactive Publication Date: 2017-09-08
射洪县才伦建材有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can produce ultra-long pipes, especially in the production of small-diameter thin-walled pipes and super-large-diameter pipes, but the yield is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Using continuous casting steel billet as raw material, the billet is uniformly heated to 1300°C for 3 hours to ensure uniform heating of the billet;

[0036] Perforation: punch the center hole on the heat pipe blank, and then perforate; the perforation temperature is 1000°C;

[0037] Machining: Machining on the surface of the tube blank and its machining cutting depth are controlled within the range that can remove casting defects on the surface of the tube blank;

[0038] annealing:

[0039] The first annealing: the tube billet after machining is put into the annealing furnace, the temperature rises to 750°C, and the temperature is kept for 1h;

[0040] The second annealing: raise the temperature in the furnace to 800°C and keep it warm for 3 hours;

[0041] The third annealing: lower the temperature in the furnace to 740°C and keep it warm for 1h;

[0042] The fourth annealing: reduce the temperature in the furnace to 680°C and keep it for 1h;

[0043] Pickling: T...

Embodiment 2

[0050] Heating: Using continuous casting billet as raw material, the billet is evenly heated to 1350°C, and the heating time is 3.5 hours, so as to ensure uniform heating of the billet;

[0051] Perforation: punch the center hole on the heat pipe blank, and then perforate; the perforation temperature is 1100°C;

[0052] Machining: Machining on the surface of the tube blank and its machining cutting depth are controlled within the range that can remove casting defects on the surface of the tube blank;

[0053] annealing:

[0054] The first annealing: put the machined tube billet into the annealing furnace, raise the temperature to 755°C, and keep it warm for 1.2h;

[0055] The second annealing: raise the temperature in the furnace to 810°C and keep it warm for 3.2h;

[0056] The third annealing: lower the temperature in the furnace to 755°C and keep it warm for 1.4h;

[0057] The fourth annealing: lower the temperature in the furnace to 690°C and keep it warm for 1.5h;

[0...

Embodiment 3

[0065] Heating: Using continuous casting steel billet as raw material, the billet is uniformly heated to 1400°C, and the heating time is 4 hours, so as to ensure uniform heating of the billet;

[0066] Perforation: punch a central hole on the heat pipe blank, and then perforate; the perforation temperature is 1200°C;

[0067] Machining: Machining on the surface of the tube blank and its machining cutting depth are controlled within the range that can remove casting defects on the surface of the tube blank;

[0068] annealing:

[0069] The first annealing: put the tube blank after machining into the annealing furnace, raise the temperature to 760°C, and keep it for 1.3h;

[0070] The second annealing: raise the temperature in the furnace to 820°C for 3.5 hours;

[0071] The third annealing: lower the temperature in the furnace to 770°C and keep it warm for 8h;

[0072] The fourth annealing: lower the temperature in the furnace to 700°C and keep it warm for 2 hours;

[0073]...

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Abstract

The invention relates to the field of steel pipe preparation, and discloses a steel pipe processing method with a high yield. The continuous casting billet is used as a raw material, and the following steps are followed in sequence: heating, piercing, surface machining, annealing, pickling, phosphating, and saponification , Rolling preheating, rolling, cooling, the steel pipe produced will not crack, the quality is high, the yield is high, and the production cost is low; the piercing temperature is related to the piercing rate and the cracking degree of the steel pipe, and the appropriate piercing temperature can ensure the piercing efficiency. Avoid cracking of the steel pipe, and also avoid the production of waste products. The annealing process of the present invention can overcome the defect that the inner or outer surface of the steel pipe is easy to crack. Since the steel pipe billet is first put into the furnace and kept at 750-760°C, the steel pipe and The temperature in the furnace is consistent, and then staged annealing treatment and cooling are performed to stabilize the performance of the tube billet.

Description

technical field [0001] The invention relates to the field of steel pipe preparation, in particular to a steel pipe processing method with high yield. Background technique [0002] At present, the existing steel pipe manufacturing methods mainly include the perforated tube billet rolling method and the strip forming welding method. The first traditional manufacturing method is to cut the steel billet to length, reheat it and send it to a two-roll or three-roll piercer to wear it into a blank tube, and then hot-roll and cold-roll the tube billet to obtain a finished tube. This method is generally used at present, but there are many processes, high energy consumption, inability to produce super-long pipes, and high pipe manufacturing costs. The yield from the solid billet to the first hot rolling pass is only about 80%. The second strip forming welding method is to roll the billet into strip steel through multiple processes, perform bright annealing, slitting and stripping, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B19/04C23G1/08C21D8/10
CPCB21B19/04C21D8/105C23G1/08
Inventor 于宗菊向礼毅
Owner 射洪县才伦建材有限责任公司
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