Knowledge of steel pipe fittings

- Feb 16, 2019-

A.Pipeline system overview: for conveying liquid or gas, must use all kinds of pipe, the pipe, except straight pipe with steel pipe is used all kinds of pipe fittings, pipe bend must use elbow, pipe size head, should be used when variable diameter tee, should be used when bifurcation pipe joint and the joint should be used when connecting flange, to achieve the purpose of open medium, but also in all kinds of valves, to reduce the thermal expansion from the cold or frequent vibration on the influence of the pipeline system, but also with expansion joint.In addition, in the pipeline, there are a variety of connections with a variety of instrumentation, plug, etc.We are used to the pipe system in addition to the straight pipe other accessories collectively referred to as pipe accessories.


2.Metal materials: metal materials are the most widely used materials in our daily life and industry.It is mainly divided into steel, iron and non-ferrous metals, and the steel is the most widely used materials, the main component of steel is iron, the rest of the artificial addition of alloy elements and various impurities.It is because of the variety and quantity of these added alloying elements that various steels are formed, such as ordinary carbon steel, stainless steel, alloy steel and so on. Among these added elements, carbon C plays a very important role.


Common chemical element in steel 2.1: various kinds of steel majority percentage of iron (Fe), except the usually contains the following several kinds of elements (often called alloy element in steel), C (carbon) Si (silicon) Mn (Mn) P (phosphorus) S (sulfur) and Cr (chromium) Ni (Ni), Mo (molybdenum) Ti (Ti) V (V), and so on.In general, P, S is the impurity, the lower the quality of steel, the better.


2.2 steel classification: according to the different adding alloy element in steel varieties, we simply steel can be divided into three categories: carbon steel, alloy steel, stainless steel. (1) carbon steel, alloy elements only C, Si, Mn, P, S five, according to the P, S high and low content of impurities, divide again for carbon-steel (P, S usually 0.040% or less), and carbon steel (P, S usually 0.03% or less), common steel grade are:


Carbon steel: q215a. Q235BF.


Excellent carbon steel: 20# 45# 16Mn, etc. This steel strength and toughness in general, not corrosion resistance, can be used for the occasion of low requirements, the lowest cost


In addition, Cr, Mo, V and other elements below 10% were added. Common steel types include:


15CrMo 12Cr1MoV 1Cr5Mo, etc. Compared with carbon steel, alloy steel has higher strength and higher temperature resistance, but its corrosion resistance is still poor. Therefore, alloy steel is usually used in high temperature and high pressure occasions with less corrosion, such as boiler steel, power plant hot steam transmission, etc., and the use cost is at the medium level.


(3) stainless steel is usually on the basis of carbon steel, increased the proportion of Cr, Ni and other alloys, the content ratio can be more than 20%.Common steel types are: 304,304L, 321, 316,316 L, 1Cr18Ni9Ti. The first several steel Numbers are represented by Japanese and American steel Numbers, and the last one (1Cr18Ni9Ti) is the domestic steel number.The following is a numerical representation of the steel number to illustrate the relationship between the components of several stainless steel: as a general understanding, but also for the convenience of beginners memory, we can think in this way (but not very accurate) :


-- -basic type steel,Only (C < 0.08%), Cr (~ 18%), Ni (~ 9%) of 304 l -- -- -- -- -- ultra-low carbon C < 0.05% (C) 304 is 304 l, 321 -- -- -- -- -- -- -- 304 + Ti (~ 0.5%) 316 -- -- -- -- -- -- -- 304 + Mo (~ 2.5%)316L----- ultra-low carbon C 316 (C<0.05%) is called 316L stainless steel strength, toughness index is the best of all kinds of steel, its most prominent advantage is the anti-corrosion, in the chemical paper and other corrosive occasions must use stainless steel, of course, its cost is the highest.


2.3 steel performance: the performance of a steel, there are always some indicators to reflect, to express. For steel, we usually use the chemical composition, mechanical properties of the value to reflect its quality and performance.Mechanical properties usually have three indicators:


 Tensile strength (σb, TS) : maximum external tensile force that a material can withstand at break.,

yield strength(σs, YS)  : the minimum value of external tension that a material can withstand in the form of plastic deformation.  

Elongation ( ψ, EL)  : the percentage of the material that is lengthened in the direction of length after breaking. The greater this value is, the better plasticity of the material.Sometimes, also use hardness value, impact toughness value to reflect material properties.

Our most common carbon steel 20#, Q235 and foreign SS400, SS41, St37 and so on, their performance is very close, or can basically replace each other, their related parameters are roughly as follows:   C:0.18-0.21%    Si: 0.30%   Mn:0.5%    P,S 0.025%  TS: ~550Mpa     YS: ~260Mpa     EL: ~ 25%    


2.4 structure of steel and its changes why there are differences in properties of steel, in fact, it is related to the internal structure of steel.Through the microscope, it can be seen that the interior of steel is made up of many different cells like small pieces of overlapping, and then carefully observed, these small pieces actually belong to several different categories, we usually call the same kind of small pieces of a "phase" or a "body".As we usually said the austenite, ferrite refers to the two most common steel structure, that is, two phases.The phases contained in a steel, the proportion of each phase, and the morphology of the phases all directly affect the properties of the steel.In other words, if the type, proportion and morphology of the steel phase change, the properties of the steel will change accordingly.So what are the factors that have changed over the years?Obviously, changes in the composition of steel will certainly affect changes in the properties of steel, and for a certain type of steel with a fixed composition, such as 20# steel, or 304L, the properties will also change when they are deformed, processed and heat treated.To sum up, the main factors affecting the properties of steel are composition, deformation and temperature.


2.4 structure of steel and its changes why there are differences in properties of steel, in fact, it is related to the internal structure of steel.Through the microscope, it can be seen that the interior of steel is made up of many different cells like small pieces of overlapping, and then carefully observed, these small pieces actually belong to several different categories, we usually call the same kind of small pieces of a "phase" or a "body".As we usually said the austenite, ferrite refers to the two most common steel structure, that is, two phases.The phases contained in a steel, the proportion of each phase, and the morphology of the phases all directly affect the properties of the steel.In other words, if the type, proportion and morphology of the steel phase change, the properties of the steel will change accordingly.So what are the factors that have changed over the years?Obviously, changes in the composition of steel will certainly affect changes in the properties of steel, and for a certain type of steel with a fixed composition, such as 20# steel, or 304L, the properties will also change when they are deformed, processed and heat treated.To sum up, the main factors affecting the properties of steel are composition, deformation and temperature.


2.5 heat treatment of steel: in order for a certain steel to achieve the best performance we hope, its internal structure must be stable in a certain stable structural state.In many cases, we have to heat treat the steel.Because a lot of our products are processed, the deformation of the above mentioned by the deformation of the steel, will change its organizational structure, that is to say, the performance of the steel is changed, and this is often what we don't want to, then we will have to take heat treatment to eliminate these changes, recover the original features of steel.And, of course, we have other ways of doing heat treatment because of other considerations.The heat treatment methods of several steels after cold and hot deformation are shown in attached table 1.


2.6 steel number representation methods: the steel number representation methods vary from country to country in the world, but most of them are expressed by two methods: one is expressed by the element and content of the alloy contained, and the other is expressed by the code name and strength value of the steel.Such as:20 # carbon content is about 0.20%, said the best carbon steel 45 # carbon - said about 0.45% of the optimum carbon steel 1 cr18ni9ti - according to carbon content: 0.1% around the following Cr18%9% Ni Ti:Contains a little 0 cr18ni9 - according to carbon content is extremely low, about 18% or less 0.08% Cr Ni 9% Q235 -- -- -- -- -- said yield strength 235 mpa > general carbon steel SS400 - said > 400 mpa tensile strength of carbon steel


2.7 common steel codes. The component properties are divided into carbon steel, alloy steel and stainless steel, which are summarized as shown in attached table 2:


3.Common pipeline materials: common raw materials used in pipelines include plates, pipes and forgings.  Sheet (1) : common plate are rolled plate, plate and opened plate. Plate bending rolls delivery, usually advantage is that can use either intercept length, the disadvantage is that there must be a corresponding decoiling equipment, surface roughness. The tablet is usually a piece of delivery, advantage is board face level off, the convenience of transportation, utilization rate is low. Defect is sometimes panel used opened plate is rolled plate through the shearing machine cut into pieces after board face level off. The distinction between tablet and opened plate method, in addition to observe the surface and edge roughness, smoothness, and a simple method: real tablet, each have a steel factory in markup, such as manufacturers, specifications, steel grade, and there is no such mark on the open plate. The theoretical weight calculation formula of the plate is as follows:Carbon steel plate weight = length * width * thickness *7.85/106 (mm, weight is kg) stainless steel plate weight = length * width * thickness *7.91/106 (mm, weight is kg) for example: a piece of 1500*6000*6 stainless steel plate:Richard = 1500 * 1500 * 6 * 7.91 = 71190000,Decimal point forward 6 = 71.19 Kg 2 pipes: this is mainly refers to the circular tube, can be divided into welded pipe (straight seam welded pipe, spiral welded pipe) and seamless tube. Welded pipe (is also called tube) is typically used for low pressure pipe (20 Kg/CM2), the spiral welded pipe and is mainly used for large diameter (such as DN400 above) system, therefore, its general thin wall thickness (usually under SCH10) seamless tube is generallyFor pipes with high pressure, due to the production process of seamless pipes, our commonly used industrial seamless pipes are usually hot-rolled. Therefore, the wall thickness of hot-rolled seamless pipes is available on the market. For pipes with a certain caliber, there is usually a certain lower limit (generally above SCH10).27 - Φ Φ 48 wall thickness of 2.0 or higher Φ 57-76 wall thickness acuity 3.0 Φ Φ 89 - Φ 159 wall thickness of 3.5 or higher Φ 168 - Φ 219 wall thickness of 4.0 or higher (Φ 168 * 3 market,But less) Φ 273 wall thickness acuity 6.0 Φ 325 - Φ 377 wall thickness acuity 8.0 Φ 402 - Φ 426 wall thickness acuity 9.0 Φ 530 - Φ acuity 10.0 630 wall thickness pipe weight per meter theory calculation formula is:Carbon steel management weight =(external warp - wall thickness)* wall thickness *0.02466 (mm, weight is kg) stainless steel management weight =(external warp - wall thickness)* wall thickness *0.02491 (mm, weight is kg)) for example: a 6 m long 273*8 stainless steel tube:Forgings: forgings are usually used in the manufacture of flanges, receptions and some joints.


3.2 pipe diameter and wall thickness:(1) said the most straightforward method is: the actual outer diameter of the pipe * actual wall thickness, such as: Φ 114.3 * 6.02 it indicates that the pipe diameter is 114.3 mm, wall thickness of 6.02 mm.However, in many cases, nominal diameters are used to represent pipe diameters for convenience of design, such as DN100, 4 ", etc..The wall thickness is represented by the pipe number SCH * *, as shown in SCH80.These values do not represent the actual outside diameter or actual wall thickness, they are just labels.Due to the use of the world's habits, A certain nominal diameter (such as DN100) represented by the actual outside diameter is not the only, to sum up, there are two main, one called the metric series (B series), one called the British series (A series).Therefore, if you only know the nominal diameter, but do not know whether it belongs to A series or B series, (steel plastic pipe fitting)



Products Description
Product Name
Welded Spiral steel pipe

OD
219-3220mm
Size
Wall Thickness
4-22mm
SCH30,SCH40,STD,XS,SCH80,SCH160,XXS etc.
Length
1-12m
Steel material
Q195 → Grade B, SS330,SPHC, S185
Q215 → Grade C,CS Type B,SS330, SPHC
Q235 → Grade D,SS400,S235JR,S235JO,S235J2
Standard
JIS A5525, DIN 10208, ASTM A252, GB9711.1-1997
Usage
USed For Structure, Accessorize And Construction
Ends
Beveled
End protector
1) Plastic pipe cap
2)Iron protector
Surface Treatment
1) Bared
2) Black Painted (varnish coating)
3) With Oiled
4) 3 PE, FBE
Technique
Electronic Resistance Welded (ERW )
Electronic Fusion Welded (EFW)
Double Submerged Arc Welded (DSAW)
Type
Welded
Welded Line Type
Spiral
Inspection
With Hydraulic Testing, Eddy Current , Infrared Test
Section Shape
Round
Package
1) Bundle,
2) In Bulk,
3) Clients' Requirements
Delivery
1) Container
2) Bulk carrier
Detailed Images

API Spec 5L Oilfield Pipeline PE Coated/SSAW Line Pipe X42, X46, X52 in oil and gas industry

Production Process
Company Information


Cangzhou Steel Pipe Group (CSPG) Co., Ltd

Cangzhou Steel Pipe Group (CSPG) Co., Ltd. is a large-sized, key metallurgic enterprise of Hebei Province in North China, whose history dates back to 1994. CSPG currently em/paces six member companies with products varying from SSAW, LSAW, ERW, seamless steel pipes to 3PE pipes, galvanized pipes, casing pipes, etc. A Joint-stock corporation, CSPG occupies an area of 600,000 square meters with a total asset of $530 million.



Specialized in the production of straight welded pipe spiral pipe galvanized pipe 3PE/3PP/FBE/TPEP internal and external epoxy powder internal and external epoxy resin cement mortar two cloth three oil buried pipeline IPN8710 non-toxic drinking water internal and external plastic coated lining plastic and other anti-corrosion pipe fittings for oil and gas pipeline water conservancy projects



Executive standard :DIN30670 DIN30678 CSA Z245 AFNOR nf49-710/711 NACE rp0394/0490 AWWAC 210/C213GB/T9711 API 5L ISO 3183Material: Q235B/Q355BGR A GR B x42-x80 l245-l555

 

Business scope: 21.3mm-3620mmLSAW submerged arc welded pipe 325-2020mmERW straight welded pipe 6mm-711mmSMLS seamless tube 10-1120mmSSAW spiral steel tube 219-3620mmDemand for quality suppliers and partners



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