Liaocheng City Tianshuo Steel Pipe Co.
Professional alloy steel pipe manufacturer
From the point of view of both the international and domestic markets, the existing production capacity of seamless pipe (including oil-specific pipe) has been greater than demand.
So, in the future, the focus should be on giving full play to the capacity of the existing units, the development of high-strength grades, high impact destruction, high corrosion-resistant petroleum tubes, high-pressure boiler tubes and gas cylinder tubes and other products.
It is also the state for the current steel market in China to optimize the product structure of the content.
This is also to increase the competitiveness of products at home and abroad, the key to expanding market share.
That is to say, to improve the market competitiveness of domestic steel pipe enterprises is to add and WTO after the domestic enterprises long-term task and the key to successful development.
Tel: 0635-2111583 Fax: 0635-2113158 Mobile: 13561484016
13869537003 seamless pipe standard:
1. Seamless pipe for structural use (GB/T8162-2008) is a seamless pipe used for general structure and mechanical structure.
Seamless Pipes
2. Seamless Pipes for Fluid Conveying (GB/T8163-2008) are general seamless pipes used for conveying fluids such as water, oil and gas.
3. Seamless pipes for low and medium pressure boilers (GB3087-2008) are hot-rolled and cold-drawn (rolled) seamless pipes of high-quality carbon structural steel used for superheated steam pipes for low and medium pressure boilers of all kinds of structures, boiling water pipes, and superheated steam pipes for locomotive boilers, large flue gas pipes, small flue gas pipes and arching brick pipes.
4. High-pressure boiler seamless pipe (GB5310-2008) is used for high-pressure and above the pressure of the water pipe boiler heating surface of high-quality carbon steel, alloy steel and stainless heat-resistant steel seamless pipe.
5. High-pressure seamless tubes for chemical fertilizer equipment (GB6479-2000) are high-quality carbon structural steel and alloy steel seamless tubes for chemical equipment and pipelines with working temperature of -40~400℃ and working pressure of 10~30Ma.
6. Seamless tubes for petroleum cracking (GB9948-2006) are seamless tubes for furnace pipes, heaters and pipelines applicable to petroleum refineries.
7. Steel pipes for geological drilling (YB235-70) are steel pipes used for core drilling by geological departments, which can be classified into drill pipes, drill collars, core tubes, casing and precipitation tubes according to their uses.
8. Seamless pipes for diamond core drilling (GB3423-82) are seamless pipes for diamond core drilling drill pipes, core pipes and casing pipes.
9. Oil drilling pipe (YB528-65) is a seamless pipe used for oil drilling with inner or outer thickening at both ends.
Steel pipe is divided into two kinds of car silk and not car silk, car silk pipe with joints coupling, not car silk pipe with butt welding method and tool joints coupling.
Theoretical weighting of seamless pipe:
Theoretical formula for seamless pipe and examples: (OD_Wall Thickness)×Wall Thickness×Seamless Pipe
0.02466=Weight of Seamless Pipe Per MeterSeamless Pipe Production:
Seamless Pipe Process
Tube Billet - --Inspection --Stripping --Inspection --Heating --Piercing -Acid washing -Repair grinding -Lubrication air-drying -Welded heads -Cold-drawn - Solution-treated - Pickled - Pickled-passivated - Inspection - Cold Rolling - Degreasing - Head Cutting - Air Drying -Internal polishing - External polishing - Inspection - Labeling - Finished products Packaging seamless pipe 1, production methods
By different production methods can be divided into hot-rolled pipe, cold-rolled pipe, cold-drawn pipe, extruded pipe and so on.
1.1, hot rolled seamless pipe is generally produced in automatic rolling unit.
Solid billets are inspected and cleared of surface defects, cut to the required length, centered on the pierced end face of the billet, and then sent to the heating furnace for heating and piercing on the piercing machine.
In the perforation while continuously rotating and advancing, under the action of the roll and the top head, the internal cavity of the billet is gradually formed, known as the rough pipe.
Then sent to the automatic rolling mill to continue rolling.
Finally, the wall thickness is evened out by the equalizing machine, and the diameter is set by the sizing machine to meet the specifications.
The use of continuous tube rolling unit production of hot-rolled seamless steel pipe is a more advanced method.
1.2, if you want to get smaller size and better quality of seamless tube, must be cold rolled, cold drawn or a combination of the two methods.
Cold rolling is usually carried out in a two-roll mill, the tube is rolled in a circular hole pattern consisting of a variable section round hole groove and an immovable conical top head.
Cold drawing is usually carried out on single or double chain cold drawing machines of 0.5 to 100T.
1.3, extrusion method is to put the heated billet in a closed extrusion cylinder, perforated rod and extrusion rod together with the movement, so that the extruded parts from the smaller die hole extrusion.
This method can produce smaller diameter steel pipe.
2, chemical composition test
c: 0.35mn: 0.55si: 0.23
p: 0.008
s: 0.008cr: 0.95ni: 0.02mo: 0.17ti: 0.0023cu: 0.05
v: 0.006
w: 0.009
3, physical properties test
3.1, according to the institutional properties of the supply of domestic seamless pipe, ordinary carbon steel according to GB/T700-88, Category A steel (but must ensure that the sulfur content does not exceed 0.050% and phosphorus content does not exceed 0.045%), its mechanical properties should be in line with the values set out in the table GB8162-87.
3.2, according to the hydraulic test supply of domestic seamless pipe must ensure that the standard of hydraulic test.
3.3 The physical property test of imported seamless pipes shall be conducted in accordance with the relevant standards specified in the contract.
2, use
2.1, seamless pipe is widely used.
General purpose seamless pipes are rolled from ordinary carbon structural steel, low alloy structural steel or alloy structural steel, with the largest output, and are mainly used as pipelines or structural parts for conveying fluids.
2.2, according to the use of different three categories of supply: a, according to the chemical composition and mechanical properties supply; b, according to the mechanical properties supply; c, according to the hydraulic test supply.
Steel pipe supplied according to category a, b, such as for bearing liquid pressure, also need to carry out hydraulic test.
2.3, seamless tubes for special purposes include seamless tubes for boilers, seamless tubes for geological purposes and seamless tubes for petroleum purposes, and many others.
3, types
3.1, seamless steel pipe can be divided into hot-rolled pipe, cold-rolled pipe, cold-drawn pipe, extruded pipe and so on according to different production methods.
3.2, according to the shape of the classification of round tube, shaped tube.
Shaped tube in addition to square and rectangular tube, there are oval tube, semicircular tube, triangular tube, hexagonal tube, convex tube, plum blossom-shaped tube.
3.3 According to the different materials, it is divided into ordinary carbon structural pipe, low alloy structural pipe, high-quality carbon structural pipe, alloy structural pipe, stainless steel pipe and so on.
3.4, according to the specialized use, there are boiler pipe, geological pipe, petroleum pipe and so on.
4, specifications and appearance quality
Seamless pipe according to GB/T8162-87
4.1, specifications: hot-rolled pipe outside diameter 32 ~ 630mm.
Wall thickness 2.5 ~ 75mm.
Cold-rolled (cold-drawn) pipe outside diameter of 5 ~ 200mm.
Wall thickness 2.5 ~ 12mm.
Wall thickness 2.5 ~ 12mm. p>
4.2, the appearance of quality: the internal and external surfaces of the steel pipe shall not have cracks, folding, rolling folding, delamination, hairline and scarring defects exist.
These defects shall be completely removed, and the removal shall not cause the wall thickness and outside diameter to exceed the negative deviation.
4.3, the ends of the steel pipe shall be cut at right angles and burrs shall be removed.
Steel pipes with wall thickness greater than 20mm are allowed to be cut by gas cutting and hot sawing.
By agreement between the supply and demand sides can also not cut the head.
4.4, cold-drawn or cold-rolled precision seamless steel pipe "surface quality" with reference to GB3639-83.
5, packaging
According to GB2102-88.
There are three kinds of steel pipe packaging: bundling, crating, oiled bundling or oiled crating.
Seamless Pipe
35CRMO seamless pipe and ordinary steel pipe application 1, seamless steel pipe for fluid: GB8163-992, seamless steel pipe for boiler: GB3087-19993, high-pressure seamless pipe for boiler: GB5310-95 (ST45.8-Ⅲ type) 4, high-pressure seamless steel pipe for chemical fertilizer equipment: GB6479-9995, high-pressure seamless steel pipe for geological drilling: GB6479-995, high-pressure seamless steel pipe for chemical fertilizer equipment: GB6479-996, high pressure seamless steel pipe for chemical fertilizer equipment: GB6479-997 19995, seamless steel pipe for geological drilling: YB235-706, seamless steel pipe for oil drilling: YB528-657, seamless steel pipe for oil cracking: GB9948-88
8, seamless steel pipe for oil drilling collars: YB691-709, seamless steel pipe for automobile semi-axles: GB3088-199910, seamless steel pipe for ships: GB5312-199911, cold-drawn and cold-rolled precision seamless steel pipe: GB3639-1999
All kinds of alloy pipe 16Mn, 27SiMn, 15CrMo, 35CrMo, 12CrMov, 20G, 40Cr, 12Cr1MoV, 15CrMo steel pipe according to the different production processes are divided into two categories of seamless and welded steel pipe.
Seamless steel pipe is a seamless steel pipe made from steel ingots, billets, or perforated steel rods.
Mainly used for hydraulic strut steel pipe.
Chemical composition of production and examination http://w