How to adapt welding materials to the development of marine engineering
2022-12-26 05:08:33
China has a vast coastline and abundant marine oil and gas resources. After geological survey and partial geophysical exploration, it is a 200m offshore shelf in the Pearl River Estuary, Yinghaihai, Beibu Gulf and Nansha Islands in the Bohai Sea, Yellow Sea, East China Sea and South China Sea. Within the scope, there are reservoirs with extremely abundant reserves. It is estimated that more than half of the basins in the South China Sea have oil and gas reserves of 10 to 30 billion tons, and oil and gas resources are about 1.5 billion US dollars. The mining prospects even exceed that of the North Sea oil fields in the UK. This area needs more than 100 in recent years. Sea platform.
However, China's offshore engineering equipment development is slow, oil and gas exploitation is greatly limited, so the development of China's offshore engineering equipment has become the top priority of the "Eleventh Five-Year" and "Twelfth Five-Year" marine resources mining. Marine engineering equipment is mainly marine platforms, pipelaying vessels, drilling vessels, lifting equipment, deepwater geophysical exploration vessels and deepwater three-purpose engineering vessels. The main constraint on China's oil and gas exploitation is the construction of offshore platforms. At present, the manufacture of offshore platforms often encounters problems such as structural design and assembly.
1. Frequently asked questions about offshore engineering equipment
The offshore engineering equipment mainly consists of drilling platform, oil production platform, oil storage platform, oil refining platform and lifting platform. The offshore platform is mainly composed of the upper module and the lower pile legs. According to the statistics, the relationship between the weight of the steel platform and the service water depth is as follows: table:
How to put this behemoth on the sea of ​​wind and waves and continue to work steadily. There are many problems from the perspective of welding. Let us talk about some of our views.
(1) Seawater Corrosion Because seawater is a strong electrolyte aqueous solution, it can cause electrochemical corrosion of steel, and the water vapor and fog surrounding the platform also have high salinity, and corrosion also exists. Generally, the corrosion of the offshore platform is divided into four zones. The tidal zone splash zone, the atmospheric zone, the underwater fully immersed zone, the sea mud zone, and the living module desalination plant all have different corrosion problems, which may lead to holes. Defects such as corrosion, stress corrosion, and corrosion fatigue. To this end, our company has developed a number of welding materials resistant to seawater corrosion. P, Cu, Cr, Al, Ni and Mo have been added to the original formulation. The weld bead can be improved in corrosion resistance compared to previous weld beads. ~ 3 times.
(2) The steel platform used for the platform is not only large in steel but also large in size and thickness. Generally, the thickness is 15 to 75 mm, and the thickness of the self-lifting platform rack steel reaches 150 mm, so Z-direction steel which is resistant to lamellar tear is generally required. Welding of this type of steel, in addition to proper heat treatment, requires the welding material to prevent cracking, to ensure high strength requirements, to improve the toughness of the weld metal and heat affected zone, and to reduce the dilution rate. In order to reduce the weight and undertake high pressure, the platform generally uses low alloy high strength steel.
(3) Mechanical properties except for defects caused by design and processing, improper selection of welding specifications will also fall short. Due to the jacket of the pile legs, the columns, trusses and supports are all made of large-diameter, high-strength thick-walled steel pipes. The joints and intersecting lines between the pipes and the pipes often encounter stress cracks caused by stress concentration during welding. Steels that are used for long-term service in low-temperature seawater require a low content of hydrogen diffused from the weld bead to prevent hydrogen-induced delayed cracking. In order to meet the requirements of high strength, large stress and low temperature impact toughness, our company has developed a large number of welding consumables covering 50-100kg grades. These welding consumables have passed the certification of many classification societies and have won many domestic and foreign Multiple orders from marine engineering equipment manufacturers.
2. Welding materials for marine engineering
In response to the above problems, we have studied the matching welding materials, as described below.
Low alloy strength steel, microalloyed high strength steel, low carbon quenched and tempered steel, medium carbon quenched and tempered steel and ultra high strength steel are used in key structural parts of marine engineering. For bearing structural parts, jackets, rack steel, pressure vessels, power equipment and submarine long-distance pipeline steel X70, X80, X100, the company has mature welding materials and welding technology.
Because stainless steel welding consumables are generally applicable to oil storage platforms, oil refining platforms, oil pipelines, platform modules, and fresh water treatment equipment, the company has many varieties of such products. Stainless steel is mainly used to prevent corrosion of seawater and crude oil. The 309 series for duplex welding and the duplex stainless steels 2209 and 2509 have strong resistance to intergranular corrosion. The application of stainless steel strip surfacing and stainless steel with electroslag welding can greatly improve welding efficiency and save labor costs.
Nickel-based welding consumables are also used extensively on the platform, especially for some pitting of brines, which are difficult to weld with different materials; on the drill bit of the drilling platform, the rack steel of the jacket and the turbine of the marine engineering ship are widely used. Hard core wear-resistant cored submerged arc welding material.
3. The company's development direction
Some customers rely too much on foreign old welding consumables, and believe that they have a long history, have almost perfect performance, and pass their success stories to China. They adopt a distrustful attitude towards domestic welding materials, not because the domestic welding consumables performance and bonding performance are worse than those of foreign countries. This makes the development of domestic enterprises as thin as ice.
We are looking for opportunities from the crisis. The goal now is to pass all welding materials to all classification societies. We obtained JIS certification in May 2009 and are currently applying for national laboratory certification. In order to expand production, the plant is being actively expanded. In order to win more customers, we are repeatedly experimenting with our products, and strive to collect positive opinions from customers, so that our products and services can be recognized by domestic and foreign customers. Our products have also been favored and applied by many domestic shipyards and marine engineering equipment manufacturers. They support domestic products and drive and even activate the domestic heavy machinery industry chain, so that the country can get rid of this economic crisis to some extent.
In recent years, we have focused on the development of new types of welding products, and enriched the various series of welding consumables, and strived to develop from the traditional fourth-generation welding consumables company into a comprehensive enterprise group related to welding. For the welding of offshore engineering equipment, each of our company's welding consumables has a variety of formulations for different customer requirements. The business project and technical services keep in touch with customers and provide the most sincere service, so they get a lot of authority in a short time. Recognition by institutions and group companies. Not only that, but also a number of tests have passed to prove that these welding materials for marine engineering can meet the test of low temperature, high salinity, deeper sea water and more intense wind and waves.
This article was published in Metalworking, Thermal Processing, Issue 20, 2009
However, China's offshore engineering equipment development is slow, oil and gas exploitation is greatly limited, so the development of China's offshore engineering equipment has become the top priority of the "Eleventh Five-Year" and "Twelfth Five-Year" marine resources mining. Marine engineering equipment is mainly marine platforms, pipelaying vessels, drilling vessels, lifting equipment, deepwater geophysical exploration vessels and deepwater three-purpose engineering vessels. The main constraint on China's oil and gas exploitation is the construction of offshore platforms. At present, the manufacture of offshore platforms often encounters problems such as structural design and assembly.
1. Frequently asked questions about offshore engineering equipment
The offshore engineering equipment mainly consists of drilling platform, oil production platform, oil storage platform, oil refining platform and lifting platform. The offshore platform is mainly composed of the upper module and the lower pile legs. According to the statistics, the relationship between the weight of the steel platform and the service water depth is as follows: table:
How to put this behemoth on the sea of ​​wind and waves and continue to work steadily. There are many problems from the perspective of welding. Let us talk about some of our views.
(1) Seawater Corrosion Because seawater is a strong electrolyte aqueous solution, it can cause electrochemical corrosion of steel, and the water vapor and fog surrounding the platform also have high salinity, and corrosion also exists. Generally, the corrosion of the offshore platform is divided into four zones. The tidal zone splash zone, the atmospheric zone, the underwater fully immersed zone, the sea mud zone, and the living module desalination plant all have different corrosion problems, which may lead to holes. Defects such as corrosion, stress corrosion, and corrosion fatigue. To this end, our company has developed a number of welding materials resistant to seawater corrosion. P, Cu, Cr, Al, Ni and Mo have been added to the original formulation. The weld bead can be improved in corrosion resistance compared to previous weld beads. ~ 3 times.
(2) The steel platform used for the platform is not only large in steel but also large in size and thickness. Generally, the thickness is 15 to 75 mm, and the thickness of the self-lifting platform rack steel reaches 150 mm, so Z-direction steel which is resistant to lamellar tear is generally required. Welding of this type of steel, in addition to proper heat treatment, requires the welding material to prevent cracking, to ensure high strength requirements, to improve the toughness of the weld metal and heat affected zone, and to reduce the dilution rate. In order to reduce the weight and undertake high pressure, the platform generally uses low alloy high strength steel.
(3) Mechanical properties except for defects caused by design and processing, improper selection of welding specifications will also fall short. Due to the jacket of the pile legs, the columns, trusses and supports are all made of large-diameter, high-strength thick-walled steel pipes. The joints and intersecting lines between the pipes and the pipes often encounter stress cracks caused by stress concentration during welding. Steels that are used for long-term service in low-temperature seawater require a low content of hydrogen diffused from the weld bead to prevent hydrogen-induced delayed cracking. In order to meet the requirements of high strength, large stress and low temperature impact toughness, our company has developed a large number of welding consumables covering 50-100kg grades. These welding consumables have passed the certification of many classification societies and have won many domestic and foreign Multiple orders from marine engineering equipment manufacturers.
2. Welding materials for marine engineering
In response to the above problems, we have studied the matching welding materials, as described below.
Low alloy strength steel, microalloyed high strength steel, low carbon quenched and tempered steel, medium carbon quenched and tempered steel and ultra high strength steel are used in key structural parts of marine engineering. For bearing structural parts, jackets, rack steel, pressure vessels, power equipment and submarine long-distance pipeline steel X70, X80, X100, the company has mature welding materials and welding technology.
Because stainless steel welding consumables are generally applicable to oil storage platforms, oil refining platforms, oil pipelines, platform modules, and fresh water treatment equipment, the company has many varieties of such products. Stainless steel is mainly used to prevent corrosion of seawater and crude oil. The 309 series for duplex welding and the duplex stainless steels 2209 and 2509 have strong resistance to intergranular corrosion. The application of stainless steel strip surfacing and stainless steel with electroslag welding can greatly improve welding efficiency and save labor costs.
Nickel-based welding consumables are also used extensively on the platform, especially for some pitting of brines, which are difficult to weld with different materials; on the drill bit of the drilling platform, the rack steel of the jacket and the turbine of the marine engineering ship are widely used. Hard core wear-resistant cored submerged arc welding material.
3. The company's development direction
Some customers rely too much on foreign old welding consumables, and believe that they have a long history, have almost perfect performance, and pass their success stories to China. They adopt a distrustful attitude towards domestic welding materials, not because the domestic welding consumables performance and bonding performance are worse than those of foreign countries. This makes the development of domestic enterprises as thin as ice.
We are looking for opportunities from the crisis. The goal now is to pass all welding materials to all classification societies. We obtained JIS certification in May 2009 and are currently applying for national laboratory certification. In order to expand production, the plant is being actively expanded. In order to win more customers, we are repeatedly experimenting with our products, and strive to collect positive opinions from customers, so that our products and services can be recognized by domestic and foreign customers. Our products have also been favored and applied by many domestic shipyards and marine engineering equipment manufacturers. They support domestic products and drive and even activate the domestic heavy machinery industry chain, so that the country can get rid of this economic crisis to some extent.
In recent years, we have focused on the development of new types of welding products, and enriched the various series of welding consumables, and strived to develop from the traditional fourth-generation welding consumables company into a comprehensive enterprise group related to welding. For the welding of offshore engineering equipment, each of our company's welding consumables has a variety of formulations for different customer requirements. The business project and technical services keep in touch with customers and provide the most sincere service, so they get a lot of authority in a short time. Recognition by institutions and group companies. Not only that, but also a number of tests have passed to prove that these welding materials for marine engineering can meet the test of low temperature, high salinity, deeper sea water and more intense wind and waves.
This article was published in Metalworking, Thermal Processing, Issue 20, 2009
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