1. If the gap is too large, the effect of cuts constituting nearby, eddy current lack of heat, weld crystal adverse indirect co-occurrence of incomplete fusion or cracking.

2. The gap is too small, the effect is increased near constitute, excessive heat welding to form weld burning; perhaps weld by kneading, rolling after composing pit, affecting the quality of the weld surface of the tube two after marginal heated to welding temperature at kneading roll kneading, together constitute the metal grain mutual penetration, crystallization, ending constitute strong weld. If the spiral steel kneading force is too small, together constitute the number of crystals is small weld metal strength decreases, cracking may occur after the force; if kneading force is too large, will make the molten metal is extruded weld situation, not only reduces the weld strength, and the list will be a lot of glitches, and even take the welding seams constituting other shortcomings.

API 5L covers seamless and welded steel line pipe.This is steel pipe for pipeline transportation systems in the petroleum and natural gas industries.API 5L is suitable for conveying gas, water, and oil.Size range is limited only by manufacturer’s capabilities.

Specifications for API 5L adhere to the International Organization for Standardization ISO 3183, which standardizes pipeline transportation systems within the materials, equipment and offshore structures for petroleum, petrochemical, and natural gas industries.The technical committee authoring the standards recognized that there are two basic Product Specifications Levels (PSL) of technical requirements and therefore developed PSL 1 and PSL 2.PSL 1 is a standard quality for line pipe where PSL 2 contains additional chemical, mechanical properties, and testing requirements.

API 5L General Information:

The API SPEC 5L specification provides standards for pipe suitable for use in conveying gas, water, and oil in the natural gas and oil industries. The API SPEC 5L covers seamless and welded steel line pipe. It includes plain-end, threaded-end, and belled-end pipe, as well as through-the-flowline (TFL) pipe, and pipe with ends prepared for use with special couplings.

Pipe manufactured to ASTM106 Grade A or B are not interchangable with API 5L. Requirements to API 5L X grades are more stringent; rolled grades are not acceptable and rework is not allowed. Moreover, particular attention is given to toughness and toughness tests for sour services and higher pressure & temperature classes.

Our sales market is spreading all over the world, such as Southeast Asia, Mid-east, Europe, South America, Africa and so on, obtaining a good reputation among customers.

API is short for the American Petroleum Institute, API certification sub-system API monogram certification and product certification.

API5L authentication refers to the API monogram certification following certification:

API Spec 5L line pipe

API Spec 5LC CRA pipeline corrosion resistant alloy tube

API Spec 5LCP continuous pipeline

API Spec 5LD corrosion-resistant steel alloy outer cover or liner

First, for galvanized steel is higher if the hardness of said component elements described it contained therein carbon is higher. However, while the existence of relatively poor plasticity, and no toughness. So galvanized steel carbon as one of its elements are not affected by the higher, the more good.

The second is sulfur, it can be said to elemental sulfur steel products harmful impurities. If the steel products are too many elements that ingredient, then it will become very fragile.

There are elements to say that one of the effects of phosphorus. In excellent products for the amount of phosphorus component to be strictly controlled. Because if low-carbon steel in products if there is too much phosphorus, then it is very easy to cut. While the foregoing describes both the good side and bad side, but different worry, because we have tungsten to help improve wear resistance properties of the product, and chromium exists to help improve the strength of steel products, and It can also improve the ability to resist oxidation products.

Welded steel pipe production process is simple, high production efficiency, variety specifications, less capital equipment, but the general strength less than seamless steel tubes. Since the 1930s. With the rapid development and progress of high-quality steel rolling production welding and inspection techniques. Weld quality continues to increase. Welded steel pipe increasing varieties and specifications. And in more and more areas instead of seamless steel tubes. Welded steel pipes in the form of weld into Longitudinal and spiral welded pipe.

Longitudinal production process is simple, high production efficiency, low cost, rapid development. Spiral Welded Longitudinal generally higher than that. You can narrow the billet production of large diameter pipe. You can also use the same width of the billet production of different pipe diameters. However, compared with the same length of straight seam pipe. Weld length of 30 to 100%. And lower production rate. Therefore, smaller diameter pipe is mostly a straight seam welding. Large diameter spiral welded pipe for the most part.

Low pressure liquid delivery welded steel pipe (GB / T3092-1993), also known as general welded pipe, commonly known as the clarinet. Welded steel pipe is used for transporting water, gas, air, oil and heating steam and other general low pressure fluid and other uses. Then divided into ordinary steel pipe wall thickness and thicker steel. It took over end into the form of steel pipes without (fluorescent tubes) and with steel pipe. Pipe specifications with nominal diameter (mm) Fig. The nominal diameter is the diameter of the approximation. Traditionally commonly expressed in inches, such as 11/2 and so on. Low pressure fluid in addition to direct for conveying fluids outside the welded steel pipe. Also widely used as a low pressure fluid delivery galvanized welded steel pipe of the original tube.

1. Low pressure fluid delivery galvanized welded steel pipe (GB / T3091-1993), also known as galvanized welded steel pipe, commonly known as white tube. Is used for conveying water, gas, air and steam heating oil, warm water, etc. are generally lower pressure fluid or other uses hot-dip galvanized welded (furnace brazed or welded) steel pipe. Pipe wall thickness then divided into ordinary galvanized steel and thicker galvanized steel; take over the side into the form of threaded galvanized steel and non-threaded galvanized steel band. Pipe specifications with nominal diameter (mm), said nominal diameter is the diameter of the approximation. Traditionally commonly expressed in inches, such as 11/2 and so on.

2. Ordinary carbon steel wire casing (GB3640-88) industrial and civil construction, installation of machinery and equipment for the protection of electrical installation engineering steel wires.

3. Straight seam welded steel pipe (YB242-63) is parallel to the longitudinal weld steel pipe steel pipe. Usually divided into metric welded steel pipe, welded thin-walled tube, transformer cooling tubing and the like.

4. Pressure fluid transport with spiral submerged arc welded pipe (SY5036-83) is a hot-rolled steel strip coils for the tube. Often warm spiral shape, using double-sided submerged arc welding method for spiral seam steel pressurized fluid delivery. Strong pressure steel, good welding performance, through a variety of rigorous scientific examination and testing, the use of safe and reliable. Large diameter steel pipes, transmission efficiency, and can save the laying of pipeline investments. Mainly used to transport oil, natural gas pipelines.

5. Pressure fluid transport with spiral seam high frequency welded steel pipe (SY5038-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape, using high-frequency welding lap welding method. Spiral seam high frequency welded steel pipe for pressure fluid delivery. Strong pressure steel, plastic, and easy welding and machining molding. And through a variety of rigorous scientific examination and testing, the use of safe, reliable, large-diameter steel pipes, transmission efficiency, and can save the laying of pipeline investments. Mainly used for laying transport oil, natural gas pipeline.

6. General low pressure liquid delivery spiral seam high frequency welded steel pipe (SY5039-83) is a hot-rolled steel strip coils for the tube, often warm spiral shape. Using high frequency lap welding method for general low pressure liquid delivery spiral seam high frequency welded steel pipe.

7. Pile with spiral welded steel pipe (SY5040-83) is a hot-rolled steel strip coils for the tube. Often warm spiral shape. Using double-sided submerged arc welding or high frequency welding steel. For civil engineering structures, docks, bridges and other infrastructure pile with steel pipe.

Welded steel pipe: also known as pipe, steel sheet or strip is bent after molding, and then formed by welding. Press seam form is divided into Longitudinal and spiral welded pipe. By end-use is divided into general welded pipe, galvanized pipe, oxygen blowing pipe, wire casing, metric pipe, roller tube, deep well pump tube, automotive tube, transformer tube, welding thin-walled tube, welding shaped tube and spiral welded pipe.

General Pipe: General pipe used to transport low pressure fluid. With Q195A, Q215A, Q235A steel. Other easy-welding of mild steel. To pass pipe steel and thicker steel pipe specifications with nominal pipe mouth pressure, bending, flattening and other experiments, there are certain requirements for surface quality, usually delivery length of 4-10m real different, according to the provisions pipe wall thickness Pu are two, according to steel threaded and non threaded two kinds. With pipe technology to enhance and improve the processing is simple, and now instead of part of welded pipe seamless tube, pipe is capable of producing 219mm (8 inches) or more.

Oxygen pipe: for steelmaking blowing tube, usually with small diameter welded pipe, specifications from 3/8 inch -2 inch eight kinds. Made 08,10,15,20 or Q195-Q235 strip. To corrosion, and some carried ALUMINIZING.

Metric pipe: seamless form with specifications, pipe diameter * wall thickness in millimeters, with ordinary carbon steel, high carbon steel or low alloy steel Prudent Energy tropical, cold with welding, or welding after tropical by cold call method made. Metric thin-walled pipe sub ordinary and ordinary as a structural member, such as a drive shaft, or transmission fluid, used in the production of thin-walled furniture, lamps, etc., to ensure the strength and pipe bending test. Roller tube: welded steel pipe for the belt conveyor idlers, hydrostatic and general flattening test.

Spiral welded pipe: a low-carbon steel strip by a prime structural steel or low-alloy structural predetermined helix angle (called molding angle) rolled into a tube and then seam welded tubes made of strip production of large diameter steel. Spiral welded pipe is mainly used for oil, natural gas pipelines, its specifications diameter * wall thickness. There are spiral welded pipe welding and double-sided welding, pipe should ensure that hydrostatic test, weld tensile strength and forming performance to meet the requirements.

We stock a large inventory of high-quality stainless steel welded pipe. Steel Piling and Steel Casing Pipes require professional quality welded pipe. Southland Pipe is a major structural grade steel pipe supplier that fabricates custom length pipe and assemblies for customers in the building and utility construction industries.

Our 304 and 316 stainless steel welded pipe meets and exceeds today's strict certifications. ASTM A312 stainless steel welded pipe has a resistance to corrosion and maintains strength at high temperatures. All of our stainless steel pipe can be custom cut and polished to meet your exact specifications. We are your welded stainless steel pipe supplier.

Welded joint: The most widely used type for the joining of steel pipes. Steel pipe is relieved with bevelled ends which are made with special equipment in compliance with the relevant stanards.

Spherical socket joint: provides the possibility of a rotation 10 degrees at the pipeline without the utilization of any special fittings. Steel pipes are welded from outside after proper erectioning according to required angle.

Spigot and socket joint: Especially used for the steel pipes inside coated with cement mortar. Steel pipes are welded from outside after sectioning.

Flanged joint: The special manufactured flanged are welded to the ends of the pipe and then jointed with bolts.

Saginaw Pipe stocks a complete inventory of carbon steel pipe, ranging in size from 1/8 inch to 48 inch OD. We carry STD, Schedule 40, Schedule 80, and most intermediate wall thicknesses. CW, ERW and DSAW welded and SMLS seamless Steel Pipe.

As a stocking distributor for most major domestic pipe mills, Saginaw Pipe's steel pipe inventory includes many hard-to-find sizes and grades as well as all common carbon steel pipe grades and sizes. Ask about our pipe beveling, grooving, painting and coating options.

Wall casing pipe Also known wall bushing wall tube, waterproof casing pipe, wall embedded pipe, waterproof casing is divided into rigid waterproof casing and flexible waterproof casing. Called for conducting exchanges on the use of electricity wall bushing. From the material can be divided into dry capacitor AC wall bushing and porcelain insulator wall bushing exchange. Referred to respectively as silicone rubber casing and ceramic casing.

Flexible waterproof casing wall is applied to the pipe through the wall at that vibration or tight waterproof requirements structures of metal fittings. The general production enterprises are developed based on the design of Building Research S312,02S404 standard atlas manufacturing. Wall flexible waterproof casing wear wall at the wall. In case of non-concrete should switch to concrete walls. And it must be solidified in a casing wall. Wall flexible waterproof casing Shi widely used in construction, chemical, steel, water, sewage treatment and other units.

Rigid waterproof casing wall steel pipe plus wing ring (steel ring set to do on the pipe). Mounted on the walls (mostly concrete walls), for general pipeline through walls, conducive to the wall waterproof, and flexible waterproof casing wall in addition to external wing ring, inside the stalls circle there like, Falanneisi, complete sets to sell, but also their processing for damping have required piping, pumps and pipes, such as when connected through the wall.

Whether flexible or rigid wall waterproof casing waterproof casing wall are used by pipeline through vibration or strict water requirements of the wall of a building hardware accessories. Commonly used in construction, chemical, steel, water, sewage treatment and other units.

- Wall concrete construction foundation pipeline wear, clothing Liang, wearing special-shaped column, should be installed together with civil engineering. The reason is that, after the reserved holes, the second pouring concrete between the casing and hard to deal with. Some can not handle, such as installing a rigid wall bushing on the basis of basement concrete shear wall.

"Before installing the pipe installation."

- Refers to the pipeline through the concrete floor, ordinary brick wall, usually reserved holes in the concrete floor, after ordinary brick wall can be drilled through the wall eye. At the floor, before security pipeline, out of the gate lines, mounting sleeve. Brick wall, drawing a line, planted stented, looking for a good slope.

By the primary winding, the outer sheath, silicone rubber umbrella skirt, both ends of the pressure hood, clamp flange and conductive like.

No oil, no gas, no porcelain, small size, light weight, less maintenance, fire and explosion, and attached high precision through current transformers. Since the voltage distribution along the surface and the use of silicone rubber material as the outer insulation can be further improved flashover voltage.

Easy cutting steel structure is the role of some elements in steel to improve the machinability of steels, suitable for high speed cutting of steel in the automatic machine. Elements commonly used to improve machinability of S, Pb, CA, etc., which in s most commonly, s in steel formation of MNS inclusions MNS is crisp and certain lubrication and chip is easy to break, high surface roughness of workpiece, reduce tool wear, improve the cutting speed. Easy cutting structural steel although the steel containing P, S more, single in this kind of steel is as a beneficial element to join or save down, therefore, belong to high quality steel. Easy cutting structural steel is used as the production standard parts such as small screws, nuts, oil pumps, watches, computers, typewriter parts, machine tools, light bars, screws, etc.. Free cutting steel plate with a "Y" with steel, low alloy steel in Y40Mn are good, the rest are carbon steel.

purpose

Free cutting steel structure is referred to as easy cutting steel, containing a small amount of cutting elements, good machinability of steel is. 1.Y12 parathion compound low carbon free cutting steel, free cutting steel is the existing phosphorus content in a steel most. Commonly used in the manufacture of mechanical performance requirements is not high of all kinds of machines and instruments instrument parts, such as a bolt, a nut, a pin, a shaft, a pipe connected to the first. 2.Y12Pb containing free cutting steel, cutting processing is good, there is no performance on the direction, and has a higher mechanical properties, commonly used in the manufacture of more important mechanical parts, precision instruments, such as parts. 3.Y15 composite of high sulfur and low silicon easy cutting steel is developed in our country and the success of steel, cutting than Y12 steel is the, commonly used for made important standards, such as bolts, nuts, pipe joint, a spring seat. 4.Y15Pb with Y12Pb, the machinability is better. 5.Y20 low sulfur compound free cutting steel, machinability is better than 20 steel and lower than 12 steel, can be carburizing treatment, commonly used in the manufacture of surface hardness, high toughness of the heart of the instrument, meter, shaft type wear-resistant parts. 6.Y30 low sulfur compound free cutting steel, high mechanical properties, machinability is also appropriate to improve the standard parts can be manufactured with high strength requirements. 7.Y35 with Y30 steel, can be quenched and tempered. 8.Y40Mn high sulfur carbon free cutting steel, high strength, hardness and good machinability, suitable for processing high rigidity of the machine parts, such as machine screws, light bars, spline shaft, rack, etc.. 9.Y45Ca Ca-S free cutting steel, not only by cutting, and the heat treatment has good mechanical properties, suitable for manufacturing is an important structure of the machine parts, such as machine tool gear shaft, spline shaft, tractor transmission shaft.

classification

Specific grades are: Y12, Y12Pb, Y15, Y15Pb, Y20, Y30, Y35, Y40Mn, Y45Ca a total of nine grades. Easy cutting structural steel points plus sulfur free cutting steel, plus sulfur free cutting steel, plus lead free cutting steel, plus calcium free cutting steel, plus sulfur carbon manganese free cutting steel and so on. Symbol and Arabia digital representation. The "pinyin" the first letter "Y" to Arabia, followed by two numbers that the carbon content of the 10000 fraction.