Seamless steel pipe products and specifications are very numerous, and their performance requirements are various. All of these should be distinguished according to user requirements or changes in working conditions. In general, SMLS pipe products should be based on cross section shape, production method, material quality, connection mode, plating characteristics and classification.
The cross-section shape of SMLS pipe can be divided into round steel pipe and special-shaped steel tube.
The special-shaped steel pipe is a kind of steel pipe with various non circular sections. There are: square tube, square tube, elliptical tube, flat tube, semicircle tube, six corner tube, six corner tube, one side six corner tube, equilateral triangle tube, five corner flower tube, octagonal tube, convex tube, double convex tube. Double tube, multi concave tube, melon tube, flat tube, diamond tube, star tube, parallel quadrilateral tube, ribbed tube, drip tube, inner fin tube, stranded tube, tube and multi-layer tube.
SMLS pipes are divided into section steel and cross section steel according to their longitudinal profile.
SMLS pipes refer to the cross section shape, inner and outer diameters and wall thickness of pipes along the length, such as periodic or non periodic changes of steel pipes. They are: conical tube, tapered tube, trapezoidal tube, trapezoidal tube, circulating pipe, bellows, radiator tube and double barrel.
2018年5月18日星期五
Seamless tube production line cooling bed type
The cooling bed of seamless pipe production line has single chain cooling bed, double chain cooling bed, new chain cooling bed, step cooling bed and spiral cooling bed.
1, double strand cold bed
The dual cooling bed includes a forward transport chain and a reverse transport chain, each transmission chain with a transmission system. The steel pipe is placed between the two lines of the forward transport chain, and the reverse chain carries the weight of the pipe body. The double bed cooling bed pushes the steel pipe forward with the thrust of the forward transport chain, and makes use of the friction of the reverse chain to continuously rotate the steel pipe. The movement of the reverse chain also makes the steel pipe always rely on the jaw plate of the front transmission chain to achieve smooth rotation and uniform cooling.
2, single chain cold bed
The single strand cold bed adopts a climbing structure. The cooling bed includes a forward conveyor chain and a fixed guide rail with a drive system. The steel tube is placed between the two handles of the forward transport chain, and the fixed rail bears the weight of the steel tube body. The single strand cooling bed uses the friction force of the forward chain claw and the fixed guide rail to rotate the steel tube, and at the same time, depending on the weight and the lifting angle of the steel, the steel pipe is always close to the forward chain claw to achieve the smooth rotation of the steel.
3, a new chain of cold bed
Combined with the characteristics of single cooling bed and double share cooling bed, the cold bed is divided into uphill and downhill. The uphill part is a double chain structure consisting of the forward transport chain and the reverse transport chain. The positive and negative interactions make the steel tube move forward and climb. The downhill section is a single chain structure parallel to the progressive transportation chain and the steel pipe, which realizes self rotation by self weight and makes the landslide movement.
4, step type cold bed
The step type cooling bed is made up of two groups of shelves. One group is fixed on the fixed beam, which is called static frame and the other is assembled on the movable beam, which is called mobile frame. When the mechanism moves, the mobile rack is lifted, the steel pipe is lifted, and the steel pipe is rolled into a toothed shape when it is raised. After the mobile gear reaches the highest position, the stepping mechanism moves the mobile frame along the direction of the cooling bed output to a step. The lifting mechanism continues to move, driving the moving bracket down, inserting the steel pipe into the stator slot, rolling the steel tube along the tooth tooth again, and moving the frame back to the initial position to complete the working cycle.
5, spiral cold bed
The screw is composed of main drive, screw and fixed cooling platform. The screw includes screw and screw screw. The working surface of the fixed cooling platform is higher than that of the spiral core and the helix. The weight of the steel pipe body is borne by the fixed cooling platform. The main drive drives the screw to rotate synchronously, and the screw on the screw drives the steel tube to roll forward and cool on the fixed cooling table.
Single strand cold bed is not suitable for continuous operation, double cold bed is better, new chain type cold bed has good effect and low cost. The step type cold bed is usually used for large or high configuration production line, and spiral cold bed is usually used to cool small diameter seamless pipe.
1, double strand cold bed
The dual cooling bed includes a forward transport chain and a reverse transport chain, each transmission chain with a transmission system. The steel pipe is placed between the two lines of the forward transport chain, and the reverse chain carries the weight of the pipe body. The double bed cooling bed pushes the steel pipe forward with the thrust of the forward transport chain, and makes use of the friction of the reverse chain to continuously rotate the steel pipe. The movement of the reverse chain also makes the steel pipe always rely on the jaw plate of the front transmission chain to achieve smooth rotation and uniform cooling.
2, single chain cold bed
The single strand cold bed adopts a climbing structure. The cooling bed includes a forward conveyor chain and a fixed guide rail with a drive system. The steel tube is placed between the two handles of the forward transport chain, and the fixed rail bears the weight of the steel tube body. The single strand cooling bed uses the friction force of the forward chain claw and the fixed guide rail to rotate the steel tube, and at the same time, depending on the weight and the lifting angle of the steel, the steel pipe is always close to the forward chain claw to achieve the smooth rotation of the steel.
3, a new chain of cold bed
Combined with the characteristics of single cooling bed and double share cooling bed, the cold bed is divided into uphill and downhill. The uphill part is a double chain structure consisting of the forward transport chain and the reverse transport chain. The positive and negative interactions make the steel tube move forward and climb. The downhill section is a single chain structure parallel to the progressive transportation chain and the steel pipe, which realizes self rotation by self weight and makes the landslide movement.
4, step type cold bed
The step type cooling bed is made up of two groups of shelves. One group is fixed on the fixed beam, which is called static frame and the other is assembled on the movable beam, which is called mobile frame. When the mechanism moves, the mobile rack is lifted, the steel pipe is lifted, and the steel pipe is rolled into a toothed shape when it is raised. After the mobile gear reaches the highest position, the stepping mechanism moves the mobile frame along the direction of the cooling bed output to a step. The lifting mechanism continues to move, driving the moving bracket down, inserting the steel pipe into the stator slot, rolling the steel tube along the tooth tooth again, and moving the frame back to the initial position to complete the working cycle.
5, spiral cold bed
The screw is composed of main drive, screw and fixed cooling platform. The screw includes screw and screw screw. The working surface of the fixed cooling platform is higher than that of the spiral core and the helix. The weight of the steel pipe body is borne by the fixed cooling platform. The main drive drives the screw to rotate synchronously, and the screw on the screw drives the steel tube to roll forward and cool on the fixed cooling table.
Single strand cold bed is not suitable for continuous operation, double cold bed is better, new chain type cold bed has good effect and low cost. The step type cold bed is usually used for large or high configuration production line, and spiral cold bed is usually used to cool small diameter seamless pipe.
2018年5月6日星期日
Seamless steel pipe production equipment requirements
There are some common production equipment for steel pipes. And of course, different types of steel pips would need the different production equipment for the special process too. Today, Tianjin Xinyue Steel Group would have an introduction for production equipment for seamless steel pipe.
Piercing mill: Taking conical-roler as quick-rolling and uniform tubularible thickness, it is widely used in seamless steel pipe's production. It is easy to adjust for feeding angle and toe angle.
Slight-stretch reducing mill: This kind of machine has three rollers for respective-power-transmission. Its flexible adjustment would make it high-precised outer diameter and superior when used for surface finishing.
Rotating heat furnace: It is available for single or dual-feeding type. Its automated furnace-temp-erature would save labor's energy.
http://www.xysteelpipe.com/info/Seamless-steel-pipe-production-equipment-requirements-1051-1.htm
Piercing mill: Taking conical-roler as quick-rolling and uniform tubularible thickness, it is widely used in seamless steel pipe's production. It is easy to adjust for feeding angle and toe angle.
Slight-stretch reducing mill: This kind of machine has three rollers for respective-power-transmission. Its flexible adjustment would make it high-precised outer diameter and superior when used for surface finishing.
Rotating heat furnace: It is available for single or dual-feeding type. Its automated furnace-temp-erature would save labor's energy.
http://www.xysteelpipe.com/info/Seamless-steel-pipe-production-equipment-requirements-1051-1.htm
Surface treatment of stainless steel tubes
Generally, in terms of the surface treatment for stainless steel pipes, manufacturers have three methods, blenching treatment, polishing treatment and coloring treatment. However, it’s unavoidable to have some problems during the surface treatment, mainly are the following problems.
1. Defects of welding crevice. When the defects are serious, usually can apply the mechanical polishing process to deal it, however, this method may cause grinding marks and result in the uneven surface and influence the appearance of pipes.
2. Uneven surface. If only give pickling passivation to welding crevice, it will also cause the uneven surface and affect the appearance of pipes.
3. Uneven polishing. For the lager object, carrying pickling passivation after manual polishing is also difficult to reach the even surface and the processing is time and cost consuming.
4. Limited capacity of acid washing. The pickling passivation is not a panacea for all kind of surface treatment. It’s also hard to remove the black scale cinder on the stainless steel pipe which is produced by plasma cutting and flame cutting.
5. Equipment factors. Bending and rolling the profile also may cause scratches and the main reason for rust after treatment.
6. Human factor. Human factors may lead to serious scratches during lifting, transporting and processing and it’s unavoidable to have bumping, dragging and hammering. All these factors will make the surface treatment more difficult and also the main reason for rust after treatment.
7. Other factors. The raw material of stainless steel pipe may have scratches during purchasing, storing and transporting which is also the reason to cause rust.
http://www.xysteelpipe.com/info/Surface-treatment-of-stainless-steel-tubes-1052-1.htm
1. Defects of welding crevice. When the defects are serious, usually can apply the mechanical polishing process to deal it, however, this method may cause grinding marks and result in the uneven surface and influence the appearance of pipes.
2. Uneven surface. If only give pickling passivation to welding crevice, it will also cause the uneven surface and affect the appearance of pipes.
3. Uneven polishing. For the lager object, carrying pickling passivation after manual polishing is also difficult to reach the even surface and the processing is time and cost consuming.
4. Limited capacity of acid washing. The pickling passivation is not a panacea for all kind of surface treatment. It’s also hard to remove the black scale cinder on the stainless steel pipe which is produced by plasma cutting and flame cutting.
5. Equipment factors. Bending and rolling the profile also may cause scratches and the main reason for rust after treatment.
6. Human factor. Human factors may lead to serious scratches during lifting, transporting and processing and it’s unavoidable to have bumping, dragging and hammering. All these factors will make the surface treatment more difficult and also the main reason for rust after treatment.
7. Other factors. The raw material of stainless steel pipe may have scratches during purchasing, storing and transporting which is also the reason to cause rust.
http://www.xysteelpipe.com/info/Surface-treatment-of-stainless-steel-tubes-1052-1.htm
The Difference between Hot Rolled and Cold Rolled Square Steel Pipe
Hot rolled carbon square tube and cold formed steel hollow section square pipe is a process, they have a great impact on the microstructure and properties of steel, rolled steel, hot-rolled mainly based, only for the production of cold-rolled trumpet steel and sheet.
Hot-rolled
Pros: You can destroy ingot casting organizations, grain refinement of steel and eliminate defects microstructure, so that the steel dense tissue mechanical properties are improved. This improvement is mainly reflected in the direction along the rolling direction to a certain extent in the steel is no longer isotropic; pouring formed bubbles, cracks and loose, can be welded at a high temperature and pressure.
Disadvantages: After hot rolling, the hot rolled square hollow section steel pipe inside the non-metallic inclusions (mainly sulphide and oxide, and silicates) is pressed into the sheet, delamination (interlayer) phenomenon. Layered in the thickness direction of the steel tension performance deteriorated significantly, and there may be an interlayer tear weld shrinkage. Weld local strain-induced contraction of the yield point strain often reach several times larger than the load caused by the strain.
Cold-rolled
Advantages: forming speed, high yield, and does not damage the coating, can be made into a variety of cross-sectional form, needs to adapt to the conditions of use; cold-rolled steel to produce large plastic deformation, thereby increasing the yield of steel point.
Disadvantages: 1 Although the molding process without thermal plastic compression, but there are still residual stress within the cross-section of the overall and local buckling characteristics of steel will inevitably have an impact;
2 Cold formed square steel pipe style is generally open section, so that the free section. low torsional stiffness. When flexural prone to twisting, bending and torsion when the pressure is prone to buckling, torsional performance is poor.
http://www.tjxysteel.com/news/Hot-Rolled-and-Cold-Rolled-Square-Steel-Pipe-261.html
Hot-rolled
Pros: You can destroy ingot casting organizations, grain refinement of steel and eliminate defects microstructure, so that the steel dense tissue mechanical properties are improved. This improvement is mainly reflected in the direction along the rolling direction to a certain extent in the steel is no longer isotropic; pouring formed bubbles, cracks and loose, can be welded at a high temperature and pressure.
Disadvantages: After hot rolling, the hot rolled square hollow section steel pipe inside the non-metallic inclusions (mainly sulphide and oxide, and silicates) is pressed into the sheet, delamination (interlayer) phenomenon. Layered in the thickness direction of the steel tension performance deteriorated significantly, and there may be an interlayer tear weld shrinkage. Weld local strain-induced contraction of the yield point strain often reach several times larger than the load caused by the strain.
Cold-rolled
Advantages: forming speed, high yield, and does not damage the coating, can be made into a variety of cross-sectional form, needs to adapt to the conditions of use; cold-rolled steel to produce large plastic deformation, thereby increasing the yield of steel point.
Disadvantages: 1 Although the molding process without thermal plastic compression, but there are still residual stress within the cross-section of the overall and local buckling characteristics of steel will inevitably have an impact;
2 Cold formed square steel pipe style is generally open section, so that the free section. low torsional stiffness. When flexural prone to twisting, bending and torsion when the pressure is prone to buckling, torsional performance is poor.
http://www.tjxysteel.com/news/Hot-Rolled-and-Cold-Rolled-Square-Steel-Pipe-261.html
2018年5月4日星期五
Storage requirements for steel pipes
Pipe may not be directly stacked on the floor, steel or concrete surface, the first layer of steel pipe from the ground at a distance not less than 0.20m. To avoid pipe damp, dust and pollution, steel pipe (or tube bundle) shall be placed in a dusty, damp places, tying both ends of the pipe must be protected with plastic or paper bags, etc., to prevent dust from entering.
Rack or stack level should be neatly arranged, and there is a clear marker number. Pipe should heat number (Lot), variety of different sizes and materials are placed in the designated rack or stack position. The same rack or stack position is not allowed to store the same size as (or similar), the same type of material and outline different heats of steel.
To prevent bending or steel pipe table injury, steel pipe (or tube bundles) should be placed at appropriate intervals and in the same horizontal plane on the sleepers, end of the tube to ensure alignment. For annealed brass, aluminum and similar hose should be placed between layers of isolation sleepers, each for at least two sleepers should be placed in a vertical pipe, and up and down on the positive, to ensure straight alignment. If the pipe
In case of the absence of feeder layer code (including code square stamp) stacked, should be properly placed wedge or use other methods to prevent rolling of steel pipe.
After cold-rolled, cold-drawn or bright annealed steel pipe does not allow open storage. If that stock conditions, open storage should be required to take appropriate precautions to avoid rain, snow, fog and other corrosive media and a lot of dust pollution pipe.
Rack or stack level should be neatly arranged, and there is a clear marker number. Pipe should heat number (Lot), variety of different sizes and materials are placed in the designated rack or stack position. The same rack or stack position is not allowed to store the same size as (or similar), the same type of material and outline different heats of steel.
To prevent bending or steel pipe table injury, steel pipe (or tube bundles) should be placed at appropriate intervals and in the same horizontal plane on the sleepers, end of the tube to ensure alignment. For annealed brass, aluminum and similar hose should be placed between layers of isolation sleepers, each for at least two sleepers should be placed in a vertical pipe, and up and down on the positive, to ensure straight alignment. If the pipe
In case of the absence of feeder layer code (including code square stamp) stacked, should be properly placed wedge or use other methods to prevent rolling of steel pipe.
After cold-rolled, cold-drawn or bright annealed steel pipe does not allow open storage. If that stock conditions, open storage should be required to take appropriate precautions to avoid rain, snow, fog and other corrosive media and a lot of dust pollution pipe.
How is the market growth rate of steel pipe
Due to multifarious factors, there is analysis for the steel pipe’s market growth rate. No matter you are seamless steel pipe, ERW steel pipe or galvanized steel pipe, we should have a basic analysis for recent year’s volume of selling.
First of all, Tianjin Xinyue Steel Group would make a basic database for supply according to supply ability of 600 Metric Ton/Metric Tons per Day.
What’s more, we would like to make a selling plan combining the market demands for steel pipe.
Of course, the conjunction of workmanship and artistry in making steel pipes decides the value of them. So we should make considerable price according to the quality of steel pipes.
When we figure out the basic information, then we can make a guess for the future market growth of steel pipe now.
http://www.xysteelpipe.com/info/How-is-the-market-growth-rate-of-steel-pipe-1047-1.htm
First of all, Tianjin Xinyue Steel Group would make a basic database for supply according to supply ability of 600 Metric Ton/Metric Tons per Day.
What’s more, we would like to make a selling plan combining the market demands for steel pipe.
Of course, the conjunction of workmanship and artistry in making steel pipes decides the value of them. So we should make considerable price according to the quality of steel pipes.
When we figure out the basic information, then we can make a guess for the future market growth of steel pipe now.
http://www.xysteelpipe.com/info/How-is-the-market-growth-rate-of-steel-pipe-1047-1.htm
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