What is Stainless Steel tube?

Stainless steel tubing is a strong and durable material that is used for structural purposes and is corrosion resistant with little need for maintenance.

A ss tubing is a metal that is shaped in a range of shapes. SS tube is designed with a superior chemical composition that propels it to work well across different conditions.

The DIN 17457 stainless tube has superior strength and works well in high pressure as well as temperature conditions. These tubes also have good hardness in low temperatures. The High temperature stainless steel tube is common in applications where small diameters are required.

The EN 10216 – 5 Stainless Steel Tube can be both hot and cold rolled and later galvanized. These tubing can be readily welded following standard welding procedures. The versatile tubes can be custom designed in different shapes and sizes as per requirements.

A stainless steel seamless tube is manufactured by piercing hot steel billets through metal and precisely shaping it. These tubes have a long production process with a long procurement time. The cost of a seamless stainless steel tube is thereby higher due to the difficulties faced in manufacturing it. Their quality however compensates for the high price. Stainless steel tube manufacturers find it difficult to produce seamless tubes above 24 inches.

A Stainless steel erw tube is produced as metal is cold rolled and coiled in a cylindrical shape. A current is passed through the longitudinal seam to melt and weld it. The tubes don’t require any filler material and are cheaper than seamless tubes. The erw tubes can be availed in different sizes.

A Stainless steel welded tube is manufactured as steel strips, plates, or coils rolled in a circular shape using special machines. The tube can be welded with or without filler material in custom sizes and shapes. They cost less than seamless tubes, but the use of filler material will determine their price compared to erw tubes.

Stainless Steel Tubing consist 10.5% Chromium of their total weight. Stainless Steel is also known as Inox steel. The name Inox translates to inoxidizable in French. SS Tubing do not corrode easily in reducing acids. Chloride pitting is also resisted by Stainless steel tubes. These properties make SS Tubing usable in many applications that require high strength and resistance to corrosion.

Tubing are made in three ways viz. Welded, Seamless and drawn-over. The minimal maintenance costs of Stainless Steel Tubing make them usable in many industries. Stainless Steel is used in man household applications like culinary devices, to industry spec applications. Many industries like chemical plants, water treatment, paper mills, chemical tankers, road tankers and more use Stainless Steel tubes. SS products also find heavy usage in medical field applications. Stainless Steel Tubing resist phosphoric and nitric acid attacks effectively. SS is found in four types Martensitic, Austenitic, Ferritic and Duplex. Where, Austenitic stainless steels are the largest group of the SS family. Up to two-thirds of stainless steel production is done using Austenitic steels.

What Is Difference Between OD And ID? Is Stainless Tubing Measured By ID Or OD?

The outside diameter (OD) and the inside diameter (ID) can be differentiated based on the thickness of a wall. Thick wall stainless steel tube is used in structural applications and is measured by its outside diameter or ID or as ID and wall thickness.

Three main usage scenarios for large-diameter stainless steel pipes

large diameter seamless carbon steel pipe

There are thousands of stainless steel pipe specifications and different uses. Today, I will share with you the three main scenarios of usinglarge diameter stainless steel pipes. Follow me!

First of all, it can be used in the family’s smoke exhaust system. Large diameter stainless steel pipes are used as domestic smoke exhaust systems, i.e. chimneys, with square, rectangular and round pipes. In addition to domestic kitchens in hotels, hotels, etc., they are also used as smoke exhaust pipes.

This is mainly due to the superiorityof the stainless steel pipe materialse. Whether anti-oil in the kitchen or outdoors in wind and rain, it has good resistance to oxidation and corrosion and is more durable than other materials.

Followed by the field of machinery and equipment. Customers who have cooperated on mechanical equipment before purchased large-diameter pipes for environmental protection equipment. Of course, the quality of the pipes is also very strict, and all the data must be accurate.

Finally, in the field of drainage systems. Although stainless steel welded pipes have limitations in the field of water supply, they can be used in drainage systems.

Large diameter stainless steel pipeshave more and more uses, and new areas of application are also on the way. The editor recommends that when purchasing pipes, choose suitable pipes according to the specific scope of use.

The seamless welding method of stainless steel pipes cannot be lost!

The market demand for stainless steel seam tubes is reflected in basic industries, such as oil, chemical industry, power generation, etc., whose demand accounts for one-third of the total consumption of stainless steel seamless pipes, with large industries such as automobiles, shipbuilding, construction and environmental protection also existing. need.

Stainless steel welded pipes are currently mainly used in heat exchanger tubes, fluid tubes, pressure tubes, tubes for mechanical structures, cityscape and other industries, with an annual consumption of around 700,000 tons. The demand for industrial stainless steel welded pipes is relatively high, and the production process is mature. At present, the annual volume of seamed stainless steel industrial pipes in my country is about 150,000 tons, and some of them still need to be imported.

Due to the high strength of stainless steel and its face-centered cubic lattice structure, it is easy to harden the formwork, so when the welded pipe is formed: on the one hand, the mold has to withstand a large frictional force, which makes the mold easy to use; On the other hand, the stainless steel sheet is easy to form a bond (occlusal) with the mold surface so that the welded tube and mold surface are tightened.

Classification and main uses of stainless steel welded pipes

  1. There are two commonly used sorting methods for stainless steel welded pipes:

(1) It is classified by geometric shape, and is classified or classified according to the shape of the cross-section of the transverse rib and the spacing of the ribs. For example, in the British standard (BS4449), the rebar is divided into type I and type II. This rating primarily reflects the grip performance of the rebar.

(2) According to the performance classification (grade), for example, in the Chinese standard (GB1499), the rebar is divided into 3 grades according to the strength grade (yield strength/tensile strength); in the Japanese industry standard (JISG3112), according to the integral performance The rebar is divided into 5 types; in the British standard (BS4461), various grades of rebar performance testing are also specified.

In addition, rebar can also be classified according to their uses, such as ordinary steel bars for reinforced concrete and heat-treated steel bars for prestressed reinforced concrete.

  1. Stainless steel welded pipes are mainly used in the fields of chemical, textile, machinery, instrumentation, aviation, automobile and others. Such as shock absorbers, reducers, condensers, water tank pipes, drive shafts, mufflers, control shafts, push brake pipes, hydraulic cylinders, air cylinders, jacks and various conveyor rollers, belt rollers, printing rollers, etc. in cars and motorcycles. Rollers for printing and dyeing textiles, stretch tubes for textile and chemical fibre machines, tubes for hydraulic supports, tubes for deep water pumps, light tubes for various machinery, outer linings for electric heaters and tubes for household appliances, etc.
  2. Stainless steel welded pipe seamless technology

The uniformity of stainless steel welded pipe is mainly completed by reducing stress, and the stress reduction process is a mandrel-free hollow base metal continuous rolling process.

Under the premise of ensuring the quality of the welding of the main pipe, the process of reducing the tension of the welding pipe consists in heating the welded pipe as a whole to more than 950 degrees Celsius, and then winding it into various diameters and outer walls using a voltage reducer (a total of 24 passes of the voltage reducer). For thick finished pipes, the hot-rolled steel pipes produced by this process are fundamentally different from ordinary high-frequency welded pipes. The secondary stress reducing roller and automatic control make the dimensional accuracy of steel pipe (especially the roundness of the pipe body and the accuracy of the wall thickness) better than similar seamless pipes.

Fluid pipes and boiler pipes produced by the developed countries of the world have adopted a large number of seamless welded pipes. With the development of society, the situation has formed that domestic hot-rolled welded pipes have gradually replaced seamless pipes.

  1. Application of plasma welding system in stainless steel welded pipe
  2. The principle of plasma arc generation

A plasma arc is a high-temperature ionized gas generated by ionic gas ionization, and through mechanical compression of a water-cooled nozzle, a plasma arc is formed through a small hole in the center of the nozzle. /cm2) in height, its temperature can reach 18000-24000K, which is also much higher than that of the free arc (5000-8000K).

Advantages of the plasma welding process

(1) The penetration ability is strong and the thickness of the plate less than 8mm does not need to be grooved, which greatly reduces the preparation time before welding.

(2) The arc energy is concentrated, the area affected by the heat of the weld is small, and the weld deformation is small.

(3) The welding speed is fast, and the plasma time is 4-5 times shorter than that of manual argon arc welding.

(4) Excellent repeatability.

(5) The stiffness of the arc column is large, and the small hole effect can be used to realize stable single-sided welding and two-sided formation.

(6) The electrode shrinks in the nozzle, which is not easy to contaminate and burn, and the electrode has a long service life and few welding defects.

(7) The welding quality is good, and there are many weldable materials.

(8) The plasma arc has good controllability and regulation.

What problems should be paid attention to when straightening stainless steel pipes

Manual straightening: Due to the relatively small diameter and long length of the304 stainless steel pipe, it will accidentally bend during transportation, and the wall thickness of this small tube is relatively thin, so when it reaches the end customer, the customer also knows that it is difficult to transport and will inevitably cause it to bend, And this kind of pipe only needs to be straightened manually, so pipes with a small diameter and thin wall thickness can be achieved by artificial straightening.

Machine straightening is different. Issues that require attention when machine straightening 304 stainless steel pipe are:

  1. Its straightening can ensure the straightness of stainless steel pipe in actual production.
  2. The degree of bending after straightening should be in accordance with the relevant standards: for the diameter of the pipe core, it should be ≯ 15 mm/m, and it can be properly relaxed for cold-drawn pipe.
  3. Before driving, check if the leveler is normal and add an adequate amount of lubricating oil. When the equipment is in good condition, drive empty for one minute to observe the operation.
  4. When straightening the304 stainless steel tube, the angle of inclination of the smoothing roller, the distance between rollers of the smoothing roller and the position of the second pair of rollers should be adjusted. At the same time, the input guide plate must be installed and adjusted correctly to ensure the quality of the smoothing.
  5. The bending degree of the incoming pipe should not be too large, otherwise it should be artificially straightened, and then the material will straighten when it meets the capacity requirements of the equipment.
  6. When straightening, it is not allowed to produce spiral dents, squares and hairs, and it is not allowed to straighten the size of the finished pipe so that it is not qualified.

Stainless steel square tube/tubing

Known for its corrosion resistance, stainless square tubing is a popular choice for railings and fencing. We carry welded stainless steel square tube in 304, 304 metric, and 316. You can order our square steel tubing in sizes of 1ft, 2ft, 3ft, 4ft, 5ft, 6ft, 7ft, 8ft, and 20ft. When considering square tubing sizes, you’ll also want to note the outer dimensions (height) and wall thickness. Price and order online today and enjoy the convenience of having the stainless steel square tubing you need delivered directly to you.

Stainless steel electropolished pipe

Electropolished Stainless Steel Tubing is used for biotechnology, semiconductor and in pharmaceutical applications. The finishing of electroplating has different standards for use in different applications. These applications require medium range of finish. Electropolishing is a process through with the absolute roughness of the Electropolished Stainless Steel Pipe is reduced. This makes the pipes more accurate in dimensions and the Ep Pipe can be installed with accuracy in sensitive systems like the pharmaceutical industrial applications. There are different materials that could be electropolished.

Stainless Steel ERW Pipe

erw stainless pipe 02

The ERW Stainless Steel Pipe can range from smaller sizes up to 24 inches outer diameter. Our ERW SS Pipes are manufactured according to international standards and are tested for quality. We also supply ERW Stainless Steel Tube & Stainless Steel Electric Resistance Welding Pipes in other material grades than the 304 and 316 grades of stainless steel. These pipes are mostly used in water, oil and other low pressure transportation of liquids. The advantage is the strength along the length of the pipes. For higher strength, the Stainless Steel Erw Square Pipe is used in some applications. Our ERW SS Pipe Standard is in accordance with the ASTM A312 ERW international standards.

Standard SpecificationASTM A312, A270, A249, A269, A268, A358, A213
ANSI / ASME SpecificationANSI/ASME B36.19M, ANSI/ASME B36.10M
Shapes and Types we produceHex, Hydraulic, Square, Round, Honed, Rectangle
Manufacturing TypeFabricated, 100% X Ray Welded, ERW (Electric Resistance Welded), CDW, Welded
Pipe End FormingPlain One End, Beveled One End, Bevel large end, Bevel one end, Bevel both ends, Beveled end, Bevel small end, Plain Both Ends, Treaded Both Ends, Treaded On End
Various TDC TypesAnnealed and Pickled, Polished, Bright Annealed, Cold Drawn
Material Surface Finish2B, No.4, No.1, No.8 Mirror Finish or custom Finish as per customer Requirements
ASME B36.10 Pipe SchedulesSCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Available Value Added ServicesColor Coding, Cutting, Threading, Grooving, Export Documentation, MTR’s Available, Polishing, Material testing, Beveling, Destructive, Threading, Export Packaging, Destructive, Machining, Non Customer Tagging/ Marking, Ultrasonic Testing

ASTM A778 stainless steel welded tubes

ASTM A778 stainless steel pipe is used in low to moderate temperature applications. The specification is for unannealed, welded stainless steel materials. There are different grades of materials used under this specification. ASTM A 778 specification covers welded unan- nealed stainless steel pipe intended for low to moderate temperatures and corrosive service where heat treatment is not required for corrosion resistance. The ASTM A778-304l is one of the most used materials. It is a low carbon variation of the 18/8 chromium nickel stainless steel. The chromium nickel composition provides better corrosion resistance and strength while the less carbon content provides ductility and better welding properties. the ASTM A778 tp316l is a low carbon version of the 316 chromium nickel molybdenum austenitic stainless steel. This has equal strength to the 304L material but with increased corrosion resistance. The added 4% molybdenum in the composition provides corrosion resistance against chloride iron rich media. So the ASTM A778 316l is preferred for use in sea water, marine and in food grade applications. The tubes come with different pressure ratings, diameters and sizes. The outer diameter and the wall thickness of the pipes account for the different schedules and pressure ratings. The ASTM A778 tp304l can come in outer diameters ranging from ¼ inches to 60 inches depending on the specification, standards and application requirements. The production type can vary such as the ASTM A778 stainless steel Welded Tubes, seamless tubes, cold drawn or hot rolled tubes. There are also threaded, beveled and plain tubes. The material cannot be annealed or heat treated for hardening.

Standard Specification for Welded, Unannealed Austenitic Stainless Steel Tubular

Tube Sizes3 In (75 mm) To 48 In (1200 Mm) Od – 0.062 In (1.5 Mm) To 0.5 In (12.5 Mm) Wall Thickness
GradesASTM A778 TP304LASTM A778 TP316LASTM A778 TP317LASTM A778 TP321ASTM A778 TP347
Length10 Ft (3 M) Lengths Or Over.
Length TolerancesNo Tube Shall Be More Than 0.25 In (6 Mm) Over That Specified. No Tube Shall Be Shorter Than Specified.
Straightness0.25 In (6 Mm) Max Deviation From 10 Ft (3 M) Straight Edge.

ASTM A312 Vs ASTM A778

  • A778 is suitable for small bore thin walled piping applications and A312 is used for large bore and higher pressure
  • ASTM A778 and A312 Pipes are available in schedule 5S, 10S, 40S, 80S, STD and XS in wall thickness (WT)
  • A778 Fabrication is better compared to ASTM A312

Stainless steel high pressure pipe

Stainless steel high pressure pipe is made up of various material grades. The maximum pressure is 19000psi and there are different dimensions. The high pressure stainless steel pipe suppliers produce these pipes under ASTM, AISI, ASME, JIS, DIN, and other international standards. The pipe sizes range from ¼ inches to 1 inch. The stainless steel high pressure tubing can be made from 304, 304L, 316 and 316L grades of stainless steel. The ultra high pressure stainless steel tubing is used for applications that operate under very high pressures. Applications include water cannons used for cutting of metals. There are different types such as he high pressure stainless steel flexible tubing. The flexible tubing can be used with moving parts and dynamic systems. The pipes are made in seamless conditions. The finish of the ss high pressure tube is suitable for aircraft industrial applications and other high end applications. There are capillary tubes, hollow sections, welded pressure piping and other types. The high pressure hydraulic stainless steel tubing is used in hydraulic systems to excerpt high pressure to components like lifts and jacks. The heavy machineries in earth moving and mining operations use the 3 8 high pressure stainless steel tubing. The different dimensions of the tubing are governed be the different standards. The high pressure 1/4 stainless steel tubing is one of the low diameter tubing where there are tubes up to 1 inches and sizes in between. The length of the tubes ranges up to 13m. The high pressure seamless tubing can also be made to custom cut to lengths.

Ultra High Pressure Stainless Steel Tubing material grades

SS 304S304003041.43011.4301Z2CND18-09
SS 316/ 316LS31603/S31600316L/3161.4404/1.44011.4404Z2CND17-12
Super Duplex 2507S327501.4410
254 SMOS31254Z1CNDU20-18-06AZ

High Pressure Stainless Steel Pipe Equivalent


ASME SA 268 TP 410 stainless steel tubing

Used as engineering steel, the SA 268 Tp 410 is a base martensitic grade of stainless steel. The UNS S41000 or Stainless Steel Type 410 Erw Tubing like most alloys in the martensitic category can be hardened or tempered using heat processing. Any heat treatment process performed on the Stainless Steel Aisi 410 Square Tubing enhances its mechanical properties, specifically its hardness properties.

The corrosion resistance properties of the Stainless Steel Grade 410 Round Tubing is lower in comparison to austenitic stainless steel grades. This being said, martensitic grades such as SS 410 Seamless Tubes are taken into consideration for those applications where good hardness property is a primary requirement. Since the Sa-268 Tp 410 Material has magnetic properties and is able to retain this property even when they are in an annealed or heat treated condition. Hence ASTM A268 Tp 410 could work well in applications that require magnetism. SA 268 410 SS Tubing in continuous service resists oxidation up to 1292°F and in intermittent service, the A 268 Tp 410 Welded Tubes can be used up to 1500°F. To sum up, the main characteristics of 410 Stainless Steel Tubing includes high tensile strength along with low fracture resistance and low ductility as well.

ASME SA268 TP410 Seamless Tubing

  • Size: 1/2″ OD – 12″ OD
  • OD: 3.00 – 219.10 mm
  • Thickness : 0.40 – 12.70 mm
  • Length: Single, Double Random & Cut Length

Stainless Steel 410 Welded Tubes

  • Size: 1/2″ – 12″ OD, Guage: 25 SWG – 10 SWG
  • OD: 6.35 to 114.3 mm O.D
  • Thickness : 0.8 – 12.7 mm
  • Length: up to 26 Meters

6Mo Stainless Steel Tube

6 Mo (UNS S31254) is a super austenitic stainless steel with a high level of molybdenum and nitrogen, providing high resistance to pitting and crevice corrosion as well as high strength compared with conventional austenitic stainless steels such as 316L.

The alloy can provide excellent resistance to stress corrosion cracking allowing tube cold forming and may be used without the necessity to re-anneal at testing up to 120°C.

What is stainless steel Type 6 Mo?

6 Mo (UNS S31254) is a super austenitic stainless steel with a high level of molybdenum and nitrogen, providing high resistance to pitting and crevice corrosion as well as high strength compared with conventional austenitic stainless steels such as 316L.

ASME SA 249 TP 304 welded stainless steel tube

asme sa 249 tp304 stainless steel welded tubes

Austenitic stainless steel pipes produced using specified SA 249 TP 304 Material are designed to be used in applications involving tubing for either boiler, superheater, heat exchanger, or condenser. Furnishing of this ASTM specified A 249 Tp 304 Stainless Steel Welded Tube is to be performed in the heat treated condition while keeping in accordance with the required solution temperature as well as the quenching method.

In addition to undergoing several mechanical tests such as flattening, flange, hardness, reverse bend, tension, and hydrostatic or nondestructive electric, the ASTM A249 304 Welded Tubing the grain size of this particular alloy grade can be determined by these tests. Apart from resisting atmospheric corrosion, the SA 249 Tp 304 Equivalent material has good resistance to moderately oxidizing and reducing environments as well. One of the benefits of using the Welded 304 Stainless Steel Tubing is that in comparison to the other stainless steel alloy, the tubes produced from SA 249 Tp 304 are cheaper, thereby proving to be an economical choice for several applications. Trade named UNS S30400, the Sa-249 Welded Tubing is one of our more popular products.

ASTM A249 Welded Austenitic Steel Tubing Mechanical Properties


ASME SA 249 TP 304 Tube Chemical Composition

TP3040,081,0218 – 208 – 110,030,045Bal.