Black steel pipe is a term given to carbon steel pipe with a black oxide scale on the surface. This black oxide scale is formed when the pipe is forged and is typically sealed with a protective oil to prevent corrosion. Because of this oxide scale and protective film, black steel pipe requires little maintenance and is used for a wide variety of applications, including in water, steam, air and gas services. Black steel pipes are typically cut and threaded in the field.
Black steel pipe has high tensile strength, making it suitable for a variety of demanding applications. The toughness of black steel pipe guards against cracks and allows high loading capacities. A critical property of black steel pipe is its uniformity. Black steel's tensile strength is uniform along the entire length of pipe, which ensures consistent and predictable diameters.
Compared to bolted lattice structures, installation of black steel pipe can be quicker and easier. Threaded ends, flanges or welded construction allows designers the ability to make adjustments as required. In addition to strength, black steel pipe can be field-fabricated and easily worked to any length. The availability of multiple components and black steel fittings reduces costs and can speed up structural steel pipe. Depending on the application and diameter, black steel pipe can be threaded or welded.
Once installed, black steel pipe has superior rust and corrosion resistance; without exterior damage such as nicks, scrapes or cuts, black steel is virtually maintenance-free. In addition, black steel piping does not shrink and retains its shape and strength. This eliminates any need to retighten or repair broken welds. This material is impervious to insects, rot or fire and, if required, can be further protected by painting or galvanizing, a powder coat or liquid application of zinc.
2017年5月4日星期四
Advantages of Hot Rolling
1. Hot-rolled carbon steel pipe can significantly reduce consumption, reduce costs
Where it can be hot-rolled billet should be hot-rolled metal, because metal hot deformation resistance than cold-rolled low, can significantly reduce energy consumption during rolling.
2. The hot rolling process can improve the performance of metals and alloys
Because coarse grains of hot-rolled state can cast broken, microcracks healing and reduce or eliminate casting defects, converting low ductility cast structural steel pipe into a higher plastic deformation of tissue.
3. The hot rolling may be a large reduction rolling
Within a certain temperature range, with increasing temperature, increasing the plasticity of metals, can use a larger amount of deformation of rolling, it can also reduce metal crack defects, improving the rate of finished metal.
4. The hot rolling usually large ingot rolling
Since the hot-rolled metal has high plasticity and less distortion resistance. It may be larger ingots, both to improve productivity, yield and rolling speed, but also for the continuous rolling process automation to create the conditions.
Where it can be hot-rolled billet should be hot-rolled metal, because metal hot deformation resistance than cold-rolled low, can significantly reduce energy consumption during rolling.
2. The hot rolling process can improve the performance of metals and alloys
Because coarse grains of hot-rolled state can cast broken, microcracks healing and reduce or eliminate casting defects, converting low ductility cast structural steel pipe into a higher plastic deformation of tissue.
3. The hot rolling may be a large reduction rolling
Within a certain temperature range, with increasing temperature, increasing the plasticity of metals, can use a larger amount of deformation of rolling, it can also reduce metal crack defects, improving the rate of finished metal.
4. The hot rolling usually large ingot rolling
Since the hot-rolled metal has high plasticity and less distortion resistance. It may be larger ingots, both to improve productivity, yield and rolling speed, but also for the continuous rolling process automation to create the conditions.
The Application of Spiral Steel Pipe in the Urban Central Heating
Urban central heating is generated by the concentrated heat of steam, hot water supply carbon steel pipe network through a city or parts of the heating used in the production and living way, which consists of heat, heat networks, heat users of three parts.
Urban central heating system, the urban economic and social development, infrastructure, and its level of development is a sign of urban modernization. The development of urban central heating area of ?urban construction in China has become a basic policy.
Central heating cogeneration and distributed mainly to the superiority of heating comparison, the focus in the following areas:
1, there is good value for money. Boilers for central heating with large capacity, high thermal efficiency can reach 90%, and scattered small boiler thermal efficiency of heating is only about 60% or less. Therefore, instead of scattered urban central heating heating together can save 20 to 30% of energy.
2, good environmental benefits. Urban pollution comes mainly from direct coal combustion produces carbon steel pipe dioxide and soot. Central heating boiler capacity, and have better dust removal equipment, using high-efficiency filter, dust removal rate of 90 to 98% or even higher, can effectively reduce urban pollution.
3, good social benefits. Urban central heating for the convenience of people's living, saving precious urban construction sites, to ease the power shortage situation in urban areas of great significance.
Urban central heating system, the urban economic and social development, infrastructure, and its level of development is a sign of urban modernization. The development of urban central heating area of ?urban construction in China has become a basic policy.
Central heating cogeneration and distributed mainly to the superiority of heating comparison, the focus in the following areas:
1, there is good value for money. Boilers for central heating with large capacity, high thermal efficiency can reach 90%, and scattered small boiler thermal efficiency of heating is only about 60% or less. Therefore, instead of scattered urban central heating heating together can save 20 to 30% of energy.
2, good environmental benefits. Urban pollution comes mainly from direct coal combustion produces carbon steel pipe dioxide and soot. Central heating boiler capacity, and have better dust removal equipment, using high-efficiency filter, dust removal rate of 90 to 98% or even higher, can effectively reduce urban pollution.
3, good social benefits. Urban central heating for the convenience of people's living, saving precious urban construction sites, to ease the power shortage situation in urban areas of great significance.
China's Steel Industry Account for Half of Global Steel Production
Recently, China Steel Association reported the operation of the steel industry in the first quarter of this year, this year is bettter than last year at the same period. It says that China's steel industry have good future. As a professional manufacturer of spiral pipe,DSAW steel pipe, , structural steel pipe, scaffolding, Shinestar Holdings Group is actively developing.
China Steel Association statistics shows that in the first quarter of 2017 the average daily crude steel 223.44 million tons, equivalent to an annual output of 816 million tons of crude steel, which is higher than last year's. Thanks to considerable profits, March steel production gets a new record to 232.25 million tons/daily. At the same time, iron ore port stocks hit a new record too, iron ore port stocks reached 135.46 million tons till the end of March. The dependence on China's iron ore from January to March was 86.6%.
However, the first quarter not means the whole year, there are still many problems in the steel industry, such as high asset-liability ratio. In the first quarter, the average asset-liability ratio of steel enterprises was close to 70%. The problem of financing still not solve.
In 2017, China's steel is entering the time of "reduction of development". Which is great cash flow pressure for the high debt ratio of the steel industry. In this case, to help the iron and steel enterprises to leverage, reduce the pressure of costs has become a general concern of the community.
Rome was not built in a day. To know that the lever is not a day of power, not a year, it not only need the support of CBRC and various ministries and governments at all levels, but also the financial system assistance, the enterprise itself to take the initiative to leverage with the CBRC.
About the "land of steel" issue, China Steel Association vice president said that the provinces and autonomous regions have cleared the "Land Steel" enterprises more than 500, involving capacity 119 million tons. From 2nd to 25th on May, for the production capacity, the inter-ministerial joint meeting will arrange nine teamss to carry out special inspections of "land steel" clean-up, which will finish on July or August.
As a steel procurement providers, Shinestar think that the use of non-mainstream steel industry, non-advanced equipment production era has passed, and today, we realize that this is the key to China's steel industry from large to strong. In the future, we will continue to introduce advanced equipment to produce better spiral pipe,DSAW steel pipe, , structural steel pipe, scaffolding to promote the rise of China's steel industry and technological progress.
China Steel Association statistics shows that in the first quarter of 2017 the average daily crude steel 223.44 million tons, equivalent to an annual output of 816 million tons of crude steel, which is higher than last year's. Thanks to considerable profits, March steel production gets a new record to 232.25 million tons/daily. At the same time, iron ore port stocks hit a new record too, iron ore port stocks reached 135.46 million tons till the end of March. The dependence on China's iron ore from January to March was 86.6%.
However, the first quarter not means the whole year, there are still many problems in the steel industry, such as high asset-liability ratio. In the first quarter, the average asset-liability ratio of steel enterprises was close to 70%. The problem of financing still not solve.
In 2017, China's steel is entering the time of "reduction of development". Which is great cash flow pressure for the high debt ratio of the steel industry. In this case, to help the iron and steel enterprises to leverage, reduce the pressure of costs has become a general concern of the community.
Rome was not built in a day. To know that the lever is not a day of power, not a year, it not only need the support of CBRC and various ministries and governments at all levels, but also the financial system assistance, the enterprise itself to take the initiative to leverage with the CBRC.
About the "land of steel" issue, China Steel Association vice president said that the provinces and autonomous regions have cleared the "Land Steel" enterprises more than 500, involving capacity 119 million tons. From 2nd to 25th on May, for the production capacity, the inter-ministerial joint meeting will arrange nine teamss to carry out special inspections of "land steel" clean-up, which will finish on July or August.
As a steel procurement providers, Shinestar think that the use of non-mainstream steel industry, non-advanced equipment production era has passed, and today, we realize that this is the key to China's steel industry from large to strong. In the future, we will continue to introduce advanced equipment to produce better spiral pipe,DSAW steel pipe, , structural steel pipe, scaffolding to promote the rise of China's steel industry and technological progress.
2017年5月3日星期三
Price List of LSAW Steel Pipe of Hunan Great Steel Pipe Co.,ltd
More information about LSAW steel pipe, pls visit:http://www.hunantube.com/newsshow/PricelistofLSAWSteelPipeonMay3rd2017.html
2017年5月2日星期二
Production Process of Pipe Fitting
There are many kinds of processing methods for pipe fittings. Many of them also belong to the category of mechanical processing. Most of them are stamping method, forging method, roller processing method, rolling method, bulging method, drawing method, bending method, and combination processing method . Carbon steel pipe processing is the organic combination of machining and metal pressure processing.
Examples are as follows:
Forging method: the use of forging machine to pipe or part of the end to be extended, so that the outer diameter reduction, commonly used forging machine has a rotary, connecting rod, roller type.
Stamping method: Use a tapered core on the punch to extend the pipe end to the desired size and shape.
Roller method: the tube placed in the tube, the outer wheel with a roller, for the round edge processing.
Rolling method: generally do not have mandrel, suitable for thick-walled tube inside the round edge.
Bending method: there are three methods are more commonly used, one method is called extension method, the other method is called stamping method, the third is more familiar with the roller method, there are 3-4 rollers, two fixed roller, an adjustment Roller, adjust the fixed roller from the finished pipe is bent. This method is applied to a wider, if the production of spiral, the curvature can be increased.
Bulging method: one is placed in the tube rubber, the top with a punch compression, the tube protruding shape; another method is the hydraulic bulging forming, filling the middle of the tube liquid, liquid pressure to the drum drum into the required shape , As most of our commonly used bellows production is used in this way of pipe fitting.
Examples are as follows:
Forging method: the use of forging machine to pipe or part of the end to be extended, so that the outer diameter reduction, commonly used forging machine has a rotary, connecting rod, roller type.
Stamping method: Use a tapered core on the punch to extend the pipe end to the desired size and shape.
Roller method: the tube placed in the tube, the outer wheel with a roller, for the round edge processing.
Rolling method: generally do not have mandrel, suitable for thick-walled tube inside the round edge.
Bending method: there are three methods are more commonly used, one method is called extension method, the other method is called stamping method, the third is more familiar with the roller method, there are 3-4 rollers, two fixed roller, an adjustment Roller, adjust the fixed roller from the finished pipe is bent. This method is applied to a wider, if the production of spiral, the curvature can be increased.
Bulging method: one is placed in the tube rubber, the top with a punch compression, the tube protruding shape; another method is the hydraulic bulging forming, filling the middle of the tube liquid, liquid pressure to the drum drum into the required shape , As most of our commonly used bellows production is used in this way of pipe fitting.
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