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Application and development of corrosion resistant alloy octg tube
Sources: this site Click: Date: 2016-4-21 18:27:51
Application and development of corrosion resistant alloy octg tube
Nickel-base alloy tube, not only in the petroleum, chemical, coal development, coal-fired power stations, nuclear power plants and other fields is widely used, but also acting on the oil and gas development has become increasingly prominent. With bad some domestic wells and geological conditions of oil and gas fields have been put into use, requiring pipe has excellent anti-H2S at high pressure conditions, CO2 high-temperature corrosion. Ordinary 13Cr OCTG including high chromium martensitic stainless steel tubing has been unable to meet the conditions of use, the urgent need for high corrosion resistance of OCTG. Such basic products on the international market monopoly, expensive, and long lead times, the domestic corrosion resistant alloy OCTG is still in start-up phase, it is now able to supply mainly Tianjin Pipe Group Co., Ltd. and Baosteel Special Steel Limited.
Nickel-base alloy tube, not only in the petroleum, chemical, coal development, coal-fired power stations, nuclear power plants and other fields is widely used, but also acting on the oil and gas development has become increasingly prominent. With bad some domestic wells and geological conditions of oil and gas fields have been put into use, requiring pipe has excellent anti-H2S at high pressure conditions, CO2 high-temperature corrosion. Ordinary 13Cr OCTG including high chromium martensitic stainless steel tubing has been unable to meet the conditions of use, the urgent need for high corrosion resistance of OCTG. Such basic products on the international market monopoly, expensive, and long lead times, the domestic corrosion resistant alloy OCTG is still in start-up phase, it is now able to supply mainly Tianjin Pipe Group Co., Ltd. and Baosteel Special Steel Limited.
February 2010, the American Petroleum Institute (API) issued a new standard ANSI / API Specification 5CRA, the corrosion resistant alloy OCTG divided into 4 groups: group 1, martensitic stainless steel, Group 2 ferrite - Austria martensitic stainless steel (duplex steel and super duplex steel), and the third group was based austenitic iron-nickel alloys, nickel-based group 4 of austenitic alloys.
Nickel-base alloy tube widespread attention at home and abroad, Japan's NSSC, American Special Metals, Argentina Tenaris, Sweden, Sandvik and China's Baoshan Iron and Steel Co., Ltd., Tianjin Steel and other domestic steel companies have established their own nickel base alloy tube production system.
A large number of domestic and international tests show that the corrosion resistance of corrosion resistant alloy with increasing Cr, Ni content increases. American Special Metals Research of high sulfur and Cl-1, nickel-based corrosion resistant alloy Incoloy under CO2 conditions Alloy 028 (N08028), Incoloy Alloy 825 (N08825), Incoloy Alloy G3 (N06985) and other test conditions, see the ISO 15156-3:2009 standards, we reached the following corrosion standards: N06985> N08825> N08028.
From engineering and technical point of view, relative to general corrosion localized corrosion the danger smaller, localized corrosion and great danger. Pitting corrosion is a concentrated within the metal (alloy) surface tens of microns range and in-depth development of the forms of corrosion, pitting factor has alloy composition, surface condition and medium composition, pH, temperature and the like.
According to the standard ISO 15156-3:2009 A.12, solid-solution nickel-based alloy according to the alloy content is divided into five categories. In austenitic alloys against corrosion greatest impact is Cr, Ni, content Mo3 elements, and Cr and Mo confrontation pitting also play a key role.
Currently, high-nickel-base alloy OCTG has been achieved domestically, so as to meet the requirements of oil to replace imported products, it has been successful in many domestic oilfield downhole use. However, research on the nickel-base alloys need to be further expanded, especially in the corrosion mechanism of H2S, CO2, S0 co-existence of conditions needs further investigation. Choice of material, the main reference standard ISO 15156-3:2009, drawing Japan and Europe and other advanced enterprise selection guide, which is not yet formed a complete theoretical system. Adjustment of product structure, improve product quality, increased research efforts, is the urgent requirement of steel pipe industry.
Nickel-base alloy tube widespread attention at home and abroad, Japan's NSSC, American Special Metals, Argentina Tenaris, Sweden, Sandvik and China's Baoshan Iron and Steel Co., Ltd., Tianjin Steel and other domestic steel companies have established their own nickel base alloy tube production system.
A large number of domestic and international tests show that the corrosion resistance of corrosion resistant alloy with increasing Cr, Ni content increases. American Special Metals Research of high sulfur and Cl-1, nickel-based corrosion resistant alloy Incoloy under CO2 conditions Alloy 028 (N08028), Incoloy Alloy 825 (N08825), Incoloy Alloy G3 (N06985) and other test conditions, see the ISO 15156-3:2009 standards, we reached the following corrosion standards: N06985> N08825> N08028.
From engineering and technical point of view, relative to general corrosion localized corrosion the danger smaller, localized corrosion and great danger. Pitting corrosion is a concentrated within the metal (alloy) surface tens of microns range and in-depth development of the forms of corrosion, pitting factor has alloy composition, surface condition and medium composition, pH, temperature and the like.
According to the standard ISO 15156-3:2009 A.12, solid-solution nickel-based alloy according to the alloy content is divided into five categories. In austenitic alloys against corrosion greatest impact is Cr, Ni, content Mo3 elements, and Cr and Mo confrontation pitting also play a key role.
Currently, high-nickel-base alloy OCTG has been achieved domestically, so as to meet the requirements of oil to replace imported products, it has been successful in many domestic oilfield downhole use. However, research on the nickel-base alloys need to be further expanded, especially in the corrosion mechanism of H2S, CO2, S0 co-existence of conditions needs further investigation. Choice of material, the main reference standard ISO 15156-3:2009, drawing Japan and Europe and other advanced enterprise selection guide, which is not yet formed a complete theoretical system. Adjustment of product structure, improve product quality, increased research efforts, is the urgent requirement of steel pipe industry.
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