Steel for petroleum casing pipe and manufacture method thereof

A technology of oil casing and manufacturing method, applied in casing, drill pipe, earthwork drilling and other directions, can solve the problems of high alloy cost and single alloy composition design system, so as to reduce alloy cost, improve market competitiveness, reduce The effect of market risk

Inactive Publication Date: 2011-03-30
SHOUGANG CORPORATION +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a steel for oil casing and its manufacturing method, which solves the problem of single alloy composition design system and high alloy cost in the prior art

Method used

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  • Steel for petroleum casing pipe and manufacture method thereof
  • Steel for petroleum casing pipe and manufacture method thereof
  • Steel for petroleum casing pipe and manufacture method thereof

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Embodiment Construction

[0033] Process route: molten iron pretreatment → converter steelmaking → LF furnace refining → slab casting → billet finishing → storage, inspection → heating furnace heating → controlled rolling → controlled cooling → coiling → inspection and storage.

[0034] The actual smelting chemical composition is shown in Table 2, the specific rolling process parameters are shown in Table 3, and Table 4 is the test results of mechanical properties.

[0035] Table 2. Chemical composition of hot rolled steel coil for J55 containing Cr oil casing, wt%

[0036]

[0037] Table 3. Coil rolling process parameters of hot rolled steel for J55 containing Cr oil casing

[0038]

[0039] Table 4. Mechanical properties test results of hot-rolled steel coils for Cr-containing oil casing J55

[0040]

[0041] The metallographic structure of the hot-rolled steel coil containing Cr for petroleum casing J55 produced by the invention is ferrite + pearlite structure, the grain size is 11 grades,...

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Abstract

The invention relates to steel for a petroleum casing pipe and a manufacture method thereof. The steel comprises the following chemical components of 0.16-0.21 wt percent of carbon, 0.10-0.40 wt% of silicon, 0.60-1.20 wt% of manganese, not more than 0.04 wt % of niobium, 0.010-0.020 wt% of titanium, 0.30-0.40 wt% of Cr, not more than 0.020 wt% of phosphorus, not more than 0.008 wt% of sulfur, 0.02-0.06 wt% of aluminum and the balance of iron and inevitable trace impurities. The manufacture method comprises the steps of: molten iron preprocessing, convertor steelmaking, low-frequency (LF) furnace refining, blank pouring, billet finishing, warehousing and checking, heating through a heating furnace, controlled rolling, controlled cooling, reeling, inspecting and warehousing. A steel coil is formed by heat rolling of the steel for the petroleum casing pipe, thus the production cost is lowered; and the steel coil has stable mechanical property and excellent welding using property.

Description

[0001] Field of study [0002] The invention relates to a steel for petroleum casing and a manufacturing method thereof, in particular to a low-cost, high-quality hot-rolled strip steel for petroleum casing and its production. Background technique [0003] Drilling operations for oil exploration and development must be drill pipe, cementing must be casing, oil production must be tubing, casing, tubing and drill pipe, kelly, drill collar are collectively referred to as OCTG. According to statistical data, about 62Kg of OCTG is required for each meter of drilling, including 48Kg of casing, 10Kg of tubing, 3Kg of drill pipe, and 0.5Kg of drill collar. In 2007, my country's OCTG production capacity reached 8.5 million tons, and the actual total amounted to 3.494 million tons. Among them, the J55 oil casing used for the surface layer mainly adopts seamless steel pipes and straight seam welded (ERW) steel pipes. With the development of new hot tandem rolling, TMCP (thermomechanical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/28C22C33/04C21D8/02E21B17/00
Inventor 张永青李明李海波王超吴新朗李永东李飞朱国森亢小敏杨健白永立代晓莉
Owner SHOUGANG CORPORATION
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