We can makes and markets cold-drawn and hot rolled seamless steel pipes and cold-drawn special-section seamless pipes which are widely applied in the industries of petrochemical, boiler, automobile, mechanical, construction, chain, electric of the company is 80000t. Our factories through ISO9001:2000 certificate, has aggressive leadships and outstanding professionals.
Steel Pipe & Tubing - All you need to know
Steel Pipe & Tubing seem similar at first blush and in fact they share many characteristics but they also have some important differences.
Definitions:
Steel Tubing is a hollow steel shape intended for structural purposes and made from carbon, stainless, or galvanized steel further divided as:
Mechanical Tubing is used in low stress applications such as fences, kitchens, restaurants, hospitals, solar panels and made with wall thicknesses up to 10 gauge.
Structural Tubing is for high stress structural application like bridges, buildings, roll cages, and underwater platforms with wall thickness from 3/16" and up. It is often referred to as Hollow Structural Sections or just the acronym HSS.
Pipe is a hollow structure that is intended to carry material such as liquids, gasses, or even solids. Its wall thickness is described by its Schedule and it is often broken down by type using the method of manufacturing it, either ERW or Seamless
How it's made:
Both Tubing and Pipe are manufactured by the first two methods below. The third is reserved for Tubing only.
Electric Resistance Welded, often abbreviated as ERW, is a process that uses specific machinery to shape the pipe and tubing. A continuous steel sheet is unwound from a coil and shaped using contoured rollers, forcing the edges together under pressure. These edges are then welded together by heating the material to over 2,000 degrees. After welding, the pipe or tubing is cut into the exact size needed.
Seamless Pipe (and tubing) is made by extruding a steel block or by drilling a solid steel bar. Next, the extrusion or the drilled steel bar is cold drawn through a dye to achieve the diameter and thickness needed. Because this process can cause mechanical hardening, sometimes the material is annealed and straightened as a final process. Seamless Pipe & Tubing is subdivided as:
Cold Drawn Seamless, or CDS, exhibits precise tolerances and a good surface finish.
Hot Finished Seamless, or HFS, has less critical tolerances and somewhat scaly finish and is not as strong as CDS.
For Drawn over Mandrel, or DOM tubing, the first stages of manufacturing are identical to ones used to make electric resistance welded tubing, but in the finishing stages the entire flash weld is taken out and the tube is cold drawn over a mandrel. A mandrel is a round object against which material can be forged or shaped. The cold drawn process provides the tube with better dimensional tolerances, improved surface finish and the strongest weld strength achievable.
Pipe Sizes:
Pipe Size is specified with two non-dimensional numbers:
- Nominal Pipe Size (NPS) for diameter based on inches.
- Schedule Number (SCH to specify the wall thickness of the Pipe.
Both the size and schedule are required to accurately specify a particular piece of pipe.
Nominal Pipe Size (NPS) is the current North American Set of standard sizes for pipes used for high and low pressures and temperatures. A further discussion of this is here.
Iron Pipe Size (IPS) was an earlier standard than NPS to designate the size. The size was the approximate inside diameter of the pipe in inches. Each pipe had one thickness, named (STD) Standard or (STD.WT.) Standard Weight. There were only 3 wall thicknesses at the time. In March 1927, the American Standards Association created a system that designated wall thickness based on smaller steps between sizes and introduced Nominal Pipe Size which replaced Iron Pipe Size.
Schedule Number for wall thickness ranges from SCH 5, 5S, 10, 10S, 20, 30, 40, 40S, 60, 80, 80S, 100, 120, 140, 160, STD, XS (Extra Strong) AND XXS (Double Extra Strong).
Pipe Grades:
A53 - ATSM A53 is a carbon steel alloy, used mostly for low pressure plumbing and comes in 3 types:
A53 Type F – Longitudinally furnace butt welded or continuous welded
A53 Type E – Longitudinally electric resistance welded (ERW)
A53 Type S - Seamless pipe
A106B – ASTM A 106 seamless pressure pipe, (ASME SA106 pipe) used in the construction of oil and gas refineries, power plants, and boilers.
A500B – Seamless carbon steel structural tubing in round, square and rectangular shapes. (HSS)
API 5L – Standards for pipe suitable for use in conveying gas, water, and oil in the natural gas and oil industries.
X52 – Welded pipe, widely used in petroleum and natural gas industries.
4130 – An alloy pipe often used int he Oil and Gas industries.
Other Pipe and Tubing Terms of Interest:
BPE – Black Plain End Pipe
BTC – Black Threaded & Coupled
GPE – Galvanized Plain End
GTC – Galvanized Threaded & Coupled
TOE – Threaded One End
Typical Pipe Coatings & Finishes:
Galvanized – Covered with a protective zinc coating on steel to prevent the material from rusting. The process can be hot-dip-galvanizing where the material is dipped in molten zinc or Electro-Galvanized where the steel sheet from which the pipe is made was galvanized during production by an electro-chemical reaction.
Uncoated – Uncoated Pipe
Black Coated – Coated with a dark colored iron-oxide
Red Primed – Red Oxide Primed used as a base coat for ferrous metals, gives iron and steel surfaces a layer of protection
Product Specification and Size :
Available Specification
| Product Name | Executive Standard | Dimension (mm) | Steel Code / Steel Grade |
| Casting | API 5CT | 114-219 x 5.2-22.2 | J55, K55, N80, L80, P110 |
| Tubing | API 5CT | 48.3-114.3 x 3.2-16 | J55, K55, N80, L80, H40 |
| Product Name | Executive Standard | Dimension (mm) | Steel Code / Steel Grade |
| Line Pipes | API 5L | 10.3-1200 x 1.0-120 | A, B, X42, X46, X52, X60, X70, X80, PSL1 / PSL2 |
| Product Name | Executive Standard | Dimension (mm) | Steel Code / Steel Grade |
| Black and Hot-Dipped Zinc-Coated Seamless Steel Pipes | ASTM A53 | 10.3-1200 x 1.0-150 | GR.A, GR.B, GR.C |
| Seamless Carbon Steel Pipe for High Temperature Service ASTM A106 | ASTM A106 | 10.3-1200 x 1.0-150 | GR.B, GR.C |
| Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes | ASTM A179 | 10.3-426 x 1.0-36 | Low Carbon Steel |
| Seamless Carbon Steel Boiler Tubes for High Pressure | ASTM A192 | 10.3-426 x 1.0-36 | Low Carbon Steel |
| Seamless Cold-Drawn Intermediate Alloy Steel Heat-Exchanger and Condenser Tubes | ASTM A199 | 10.3-426 x 1.0-36 | T5, T22 |
| Seamless Medium-Carbon Steel Boiler and Superheater Tubes | ASTM A210 | 10.3-426 x 1.0-36 | A1, C |
| Seamless Ferritic and Austenitic Alloy Steel Boiler, Superheater and Heat-Exchanger Tubes | ASTM A213 | 10.3-426 x 1.0-36 | T5, T9, T11, T12, T22, T91 |
| Seamless Carbon and Alloy Steel for Mechanical Tubing | ASTM A333 | 1/4"-42" x SCH20-XXS | Gr1, Gr3, Gr6 |
| Seamless and Welded Carbon Steel Pipes and Alloy Steel Pipes for Low Temperature Use | ASTM A334 | 1/4"-4" x SCH20-SCH80 | Gr1, Gr6 |
| Seamless Cold-Drawn Carbon Steel Feedwater Heater Tubes | ASTM A556 | 10.3-426 x 1.0-36 | A2, B2 |
| Product Name | Executive Standard | Dimension (mm) | Steel Code / Steel Grade |
| Seamless Steel Tubes for Elevated Temperature | DIN 17175 | 10-762 x 1.0-120 | St35.8,St45.8, 10CrMo910, 15Mo3, 13CrMo44, STPL340, STB410, STB510, WB36 |
| Seamless Steel Tubes | DIN 1629 / DIN 2391 | 13.5-762 x 1.8-120 | St37.0, St44.0, St52.0, St52.3 |
| Seamless Steel Tubes | DIN 2440 | 13.5-165.1 x 1.8-4.85 | St33.2 |
| Seamless Steel Pipes for Structural Purpose | DIN 2393 | 16-426 x 1.0-36 | RSt34-2, RSt37-2, RSt44-2, St52 |
| Product Name | Executive Standard | Dimension (mm) | Steel Code / Steel Grade |
| Seamless Steel Tubes for Machine Structural | BS 970 | 10-762 x 1.0-120 | Carbon Steel |
| Seamless Steel Tubes for Boiler and Heat Exchangers | BS 3059 | 10-762 x 1.0-120 | 360, 410, 440, 460, 490 |
Application
- Gas conveyance
- Petrochemical industries
- Ship building and boiler industries
American Standard1.Black and hot-dipped zinc-coated steel tube welded and seamless ASTM-A532.Seamless carbon steel tube for high temperature service ASTM-A1063.Seamless low-carbon and carbon molybdenum steel tube 4.Seamless cold-drawn low-carbon steel heat-exchanger and condenser tube ASTM-A1795.Seamless cold-drawn intermediate alloy steel heat-exchanger and condenser tube ASTM-A1996.Seamless medium-carbon steel boiler and super heater tube ASTM-A2107.Cold-formed welded and seamless carbon steel structural tubing in rounds and shapes ASTM-A5008.Seamless carbon and alloy steel for mechanical tubing ASTM-A519
Japanese Standard1.Alloy steel for mechanical tubing JIS G34412.Carbon steel for structural tubing JIS G34443.Carbon steel for mechanical tubing JIS G34454.Carbon steel for pressure tubing JIS G34545.Carbon steel boiler and heat-exchanger tube JIS G34616.Steel tube for important application JIS G34757.Steel tube for iron tower JIS G34748.Seamless steel tube for drilling purposes JIS G34659.Steel tube for heating boilers JIS G346710.Carbon steel tubes for jar-shaped service JIS G347311.Steel tube for common service JIS G345912.Steel heat-exchanger tube for low temperature service JIS G346413.Steel for mechanical and structural tubing JIS G3446
British Standard1.Seamless steel tube for mechanical and structural service BS 6323-82.Steel boile and super heater tube BS 30593.Seamless steel tube for common service BS 71914.Low carbon steel tube BS 17175.Seamless steel tube for cold process purposes BS 6323-4
German Standard1.Heat-resisting seamless steel tube DIN171752.Cold drawn or cold rolled precision seamless steel tube DIN23913.Seamless steel tube for structural application DIN23934.Seamless steel tube for special service DIN16295.Steel tube for liquid service DIN EN 10208
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