Method for improving impact power of JK55 steel grade oil well pipe by treating alloy steel with micro titanium

A technology of oil well pipe and alloy steel, which is applied in the field of seamless steel pipe manufacturing, can solve the problems of increased manufacturing cost of seamless steel pipes, and achieve the effects of low production cost, fine and uniform crystal grains, and uniform distribution of precipitates

Inactive Publication Date: 2020-01-31
TIANJIN PIPE GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, it is feasible to produce seamless steel pipes whose mechanical properties meet the requirements of J55 and K55 by adding appropriate amount of V and Nb alloying elements or adopting off-line heat treatment process. This process is feasible, but the manufacturing cost of seamless steel pipes is high. Amplitude increase

Method used

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  • Method for improving impact power of JK55 steel grade oil well pipe by treating alloy steel with micro titanium
  • Method for improving impact power of JK55 steel grade oil well pipe by treating alloy steel with micro titanium

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Embodiment

[0030] Hot rolling and forming: the temperature control of the billet in the preheating section, heating section and soaking section of the ring furnace is shown in Table 1.

[0031] Table 1 The temperature of each section of the round billet heating in the ring furnace

[0032]

[0033] The steel billet is heated to 1240℃~1290℃ in the ring furnace, and 1150℃~1210℃ is pierced into a capillary tube by a two-roll cross-rolling piercing machine, and then rolled into a waste tube through a 5-stand continuous mandrel rolling mill with a continuous rolling temperature of 1050. ℃~1160℃, and then heat sizing with 14 frame sizing and reducing machine, the outlet temperature of sizing is 830℃~900℃, and air cooling, sawing, straightening and flaw detection are carried out on a large cooling bed.

[0034] Pipe processing: steel pipe slitting, pipe end thread processing, steel pipe hydrostatic test, coupling screw connection, diameter, length measurement and weighing, spray marking, painting, sto...

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Abstract

The invention provides a method for improving impact power of a JK55 steel grade oil well pipe by treating alloy steel with micro titanium. An alloy pipe is treated by 0.010%-0.040% Ti, the method comprises electric furnace smelting, LF furnace refining, pipe billet continuous casting, pipe billet heating at 1240-1290 DEG C, two-roller cross piercing at 1150-1210 DEG C, rolling into a pierced billet by a PQF continuous mill at 1050-1160 DEG C, sizing rolling, blowing and cooling by a cooling bed fan, and forming. According to the invention, the method has the following beneficial effects: thetensile strength of the oil pipe is more than or equal to 700 MPa, the yield strength is more than or equal to 430 MPa, the elongation percentage is more than or equal to 33%, the transverse impact power at a room temperature is more than or equal to 50 J, and the structure is ferrite plus pearlite; the composition design is reasonable, the operation and control are simple and convenient, and thecost is low; the impact toughness is good, the product performance meets the requirements of J55 and K55 steel grades, and the product can be used for oil casing and an oil pipe.

Description

Technical field [0001] The invention belongs to the technical field of seamless steel pipe manufacturing in the metallurgical industry, and particularly relates to a method for treating alloy steel with micro-titanium to improve the impact energy of JK55 steel grade oil well pipes. Background technique [0002] J55 and K55 steel grade oil well pipes are one of the most commonly used petroleum special pipes in oil fields, and they are used in large quantities. API 5CT stipulates: J55 and K55 grade steel pipes require P, S≤0.030% in finished products, yield strength≥379Mpa, J55 steel grade tensile strength≥517Mpa, K55 steel grade tensile strength≥655Mpa, elongation ≥24%, There is no mandatory requirement for impact performance. With the development of the petroleum industry, drilling conditions have become increasingly complex, and the requirements for casing for the petroleum industry have become more stringent. Some oil fields have imposed mandatory requirements on the impact pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C22C38/04C22C38/02C22C38/06C22C38/50C22C38/42C22C38/44C22C38/46C22C38/48C21D8/10
CPCC21D8/105C21D2211/005C21D2211/009C22C38/001C22C38/02C22C38/04C22C38/06C22C38/14C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50
Inventor 文玉成朱海涛郑贵英刘金海李玉柱丛国元赵晓林李凯武志强殷占峰邵立强侯强徐博魏进利张然张华北邢国亮迟勇王丰产
Owner TIANJIN PIPE GROUP CORP
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