Difference Between Seamless & Welded Stainless Steel Pipes

Difference Between Seamless & Welded Stainless Steel Pipes

One of the most versatile alloys used in manufacturing and fabrication is stainless steel. SS pipes are being used in a wide range of industries. Seamless steel pipes and welded steel pipes are the two most common types of stainless steel pipes.

Seamless pipes are made from solid steel sheets or bars that are formed into solid round shapes called “billets,” which are then heated and cast over a form like a piercing rod to form a hollow tube or shell. It’s made out of a steel cylinder. After heating the bar to a high temperature, a probe is inserted into the cylinder to make a hole. It’s a circular pipe with a hollow section and no seams. The seamless steel pipe is made from carbon steel, alloy steel, stainless steel ingots, or solid tube blanks, and then rolled. These pipes are known as superior to welded pipes as they are built using monolithic steel billets, with intrinsic mechanical strength, without seam welds.

Welded pipe is a type of pipe with a steel pipe joint on the surface that is formed by bending steel belt or steel plate material into round, square, or other shapes. After that, it’s welded into place. A roller or plate bending machine is used to cold form a flat strip, sheet, or plate into a round or circular shape. A high-energy source is then used to weld the pipe with or without filler material. Welded pipes come in a variety of sizes and can be made of length. Stainless Steel 310S Welded Pipes are typically used to transport large amounts of water, oil, or gas.


The difference between Stainless Steel Seamless Pipes & Welded Pipes is: – 


  • Appearance

Steel billet has been used as a raw material for seamless steel pipe. The hot rolling process cannot remove the outer surface defects of the billet; they must be polished after the product is finished. The defect can only be partially eliminated during the wall reduction process. In contrast, Welded steel pipe is made from a hot rolled coil as raw material, and the surface quality of the coil is identical to that of the pipe, making it simple to control. Hot-rolled coils have a high-quality surface. Welded steel pipe has a much higher surface quality than seamless steel pipe.

  • Molding Process 

In the rolling process, seamless steel pipes can be created just once. Welded steel pipe is made from steel strip or steel plate and is fabricated through bending and various welding processes.

  • Performance and usage

Seamless steel pipe has a higher strength and pressure capacity than ERW welded steel pipe. As a result, it is widely used in the high-pressure equipment and boiler industries. The welding seam of a welded steel pipe is typically the weak point, and its quality has an impact on overall performance.

Welded steel pipes can withstand 20% less working pressure than seamless steel pipes. As Stainless Steel 316 Seamless Steel Pipes are dependable is used in the high range. All industrial pipelines are made of seamless pipes because they are subjected to extreme thermal, chemical, and mechanical loads. Welded pipes are preferred in the aerospace, automobile, and electronics industries, where the budget and work pressure on the pipes are both relatively low.

  • Corrosion

Not until it is exposed to a highly corrosive environment seamless steel pipe does not show signs of corrosion, whereas the weld area in welded tubes is much more susceptible to corrosion attacks. Because a welded area is considered homogeneous, it has a different malleability, lower corrosion resistance, and more dimensional variation. Seamless steel pipes eliminate these problems and thus provide excellent corrosion resistance.

Benefits of Seamless Pipes:

  • Strength.
  • Corrosion resistance.
  • Resistance to high pressure.
  • Durability.
  • Higher Purity of material.
  • Can be used for critical applications in harsh environments.

Benefits of Welded Stainless Steel Pipes:

  • Cost-efficient
  • Faster manufacturing
  • Easily customizable
  • Consistent concentricity
  • Higher tolerance

Welded steel pipes are widely used in boilers, automobiles, shipbuilding, furniture, agricultural machinery, scaffolding, wire conduit, top shelves, containers, and other applications. Whereas Seamless pipes are used in Seawater applications, Gas and fluid transfer, Chemical lines, Oil and gas flow lines, Chemical and heat processing plants.

What Are the Uses for Titanium Tubing?

Titanium tubing is reputed for its unique strength, density, and brilliant corrosion-resisting properties. Titanium tubes have applications in an endless number of industries. For applications that demand incredible strength and durability, titanium tubes are the best option. Titanium has density lower than numerous other alloys and tubing materials making it highly appropriate for applications that demand for incredible strength with light weight. 

Titanium tubes are known for the stupendous corrosion-resisting quality of titanium metal. These titanium tubes can withstand extreme temperature, weather, and severe conditions with ease. Titanium tubes and pipes are highly efficient and stand out among all the tubing materials. Along with corrosion resistivity, Titanium Gr.2 Tubes offer great strength-to-weight ratio. Through the years titanium tubes have evolved and continue to evolve in terms of strength, durability, and reliability. 

Applications of titanium tubes in various industries:

  1. Aerospace:

Titanium tubes for aerospace are extremely compatible due to the incredible strength-to-weight ratio they offer. Titanium tubes can withstand extreme atmospheric pressure and heat which make it the best choice of material for high pressure applications such as aerospace components. 

  1. Nuclear Power

Nuclear power plants are usually located at coasts of seas and these areas are prone to sea-water and salt-water exposure continuously. Titanium tubes are the best option for this industry as titanium tubes do not corrode. They last for long years and can withstand extreme conditions maintaining the structural integrity and strength of the components they are used in. 

  1. Chemical industry:

Chemical industries deal with hazardous chemicals and acidic solutions on a daily basis. These situations not only lead to corrosion caused by the chemicals but also get affected by heat given out by the chemicals and acids. Titanium tubes combat these conditions brilliantly. 

  1. Oil and Gas Industry:

Oil and gas factories and industries deal with high pressure flow of liquids and gases which can lead to cracking of pipes if the right tubing materials are not used. Titanium stands as the best choice of material. Titanium tubes are highly reliable and do not lose their strength easily. Oil and gas industries demand for tubes that are highly corrosion resistant as they are used in downhole and offshore drilling equipment. Titanium tubes and pipes are thus ideal for these applications.

Guide to Titanium Pipe

Titanium Pipes

Titanium Piping Systems have been shown to be particularly cost-effective techniques of avoiding destructive corrosion in chemical processing lines. The following information provides background on Titanium, its properties, strengths, and how Titanium Pipe could be the key to corrosion prevention in your application.

How Titanium Pipes are made

The fabrication of ingots is the first step in the manufacturing process. The titanium sponge will be melted at high temperatures in a furnace, and the carbon that remains will be removed with the help of oxygen. After that, the titanium will be placed into a copper crucible and allowed to cool. Titanium Grade 2 Pipes is mined from a variety of naturally occurring ores across the planet. Ilmenite, leucoxene, and rutile are the most common ores used to make titanium.

Higher hardness and strength of Titanium Pipes

The tensile strength of commercial-grade titanium is normally around 63,000 psi. Commercially pure titanium has the softest grade of roughly 240 MPa, but high-strength alloys can reach 1,400 MPa.

An application where Titanium Pipes are Used

Instrumentation, Ferrules, Offshore Fire Water Systems, Structural Purposes, Medical, Pharmaceutical, Economizers, Condenser, Furniture industries, domestic applications, bus body, fencing, Cryogenic Tube, Offshore construction, Food and pharmaceutical processing, Desalination and wastewater projects, and Electrical Submersible Pump are some of the applications where titanium pipes are used.

Titanium Pipes have Excellent Corrosion Resistant Properties

In terms of corrosion resistance, Titanium Grade 5 Pipes are among the best among naturally occurring metals. When exposed to air and moisture, a persistent, continuous, and strongly adherent protective oxide film forms nearly immediately on the metal’s surface.

Chemical Resistance Of Titanium pipes

Reduced acids such as sulfuric, hydrochloric (HCl), and phosphoric acid are moderately resistant to titanium pipes. Corrosion rates increase as temperature and acid concentration rise.

The temperature of titanium pipes

Creep and oxidation resistance limit the maximum service temperature of Titanium pipe alloys. Today’s Titanium pipe alloys are designed to withstand temperatures up to 600°C.

What Is Welded Pipe And What Are They Used For (SS 310 Welded Pipe)

The welded pipe is made by forming flat products (strip, sheet, or plate) to the desired shape, in this case normally round. Once the desired shape is achieved, a high energy source is used to melt the metal locally at the weld joint. It is squeezed together and allowed to solidify, forming a weld bead. The high energy source can be an electric arc, a plasma arc, a laser beam, or even an electron beam.  The welded weld bead is usually a bit thicker than the adjacent base metal and needs to be changed to match the base metal thickness and to correct unwanted physical, chemical, and corrosion resistance attributes of the weld.

Welded pipe manufacturing

  • At the beginning of the ASTM A312 SS TP 310 Welded Pipes manufacturing process also known as slabs or billets are cast in a steel mill. Dependent on the external dimensions and wall thickness there are different methods of producing welded pipes: Electric Resistance Welding (ERW), Fusion Welding (EFW), and Double Submerged Arc Welding (DSAW). In the ERW and EFW manufacturing process welded pipes are formed by hot or cold rolling plate and welding the seam.
  • To keep the outside (O.D.) surface of a welded pipe smooth and uniform a cutting tool called scaring blade is used to remove the weld flash. Scaring from the inside (I.D.) welded flash is also possible. With heat-treating at the end of the manufacturing process, the weld zone of the steel pipe can be made less visible.
  •  Due to the weld seam, lower operating pressures are stated by ASME compared to seamless pipes. In generally welded pipes possess tighter dimensional tolerances than seamless pipes and are less costly if produced in the same quantities.

Uses of SS 310 Welded Pipes

  • Welded steel pipes for low-pressure fluid transportation are used to transport water, gas, steam, compressed air, etc. structural welded steel pipes can be used to manufacture scaffolds, trusses, towers, playgrounds, railings, etc.
  • Steel door metal window-formed tube is used to make metal door metal window, metal to update wooden. Wire bushings are used to put a cord and cable. The car driveshaft tube is used to fabricate the car pressure shaft assembly.
  • Mechanical shape tube is used to fabricate diverse machines and accessories. It may be used as a belt conveyor roller, deep properly pump tube, sprinkler irrigation pipe, diverse pipe fittings for automobiles, diverse pipe fittings for bicycles, etc.
  • SS 310 Welded Pipes are particularly used to fabricate fixtures of diverse metal-wooden structures. Small-diameter diameter pipe may be used as radiator pipe of refrigerator-freezer, high-stress oil pipe for car, brake pipe.
  • Boiler tubes are used to fabricate steam generator tubes, superheated steam tubes, water pipes, pipes, air preheated tubes, and warmth exchanger tubes. Oil pipe is used as oil pipe, casing, and oil pipeline. Spiral welded pipe is used as conveying pipeline and big diameter directly welded pipe is likewise used as conveying pipeline. The exclusive segment tapered welded pipe is used as a lamp post. Composite pipe, the natural lined pipe may be utilized in unique programs proof against diverse corrosion. Stainless 310 welded pipes are on the whole used withinside the chemical enterprise & meals enterprise.

Application and Benefits of TITANIUM GR 2 Seamless Tubes

Titanium has a high tensile strength, and is very strong. Titanium is lighter in weight due to the presence of aluminum and is also very resistant to corrosion. An alloy obtained by combining iron and some other chemicals. The alloy is named as Titanium. The chemical elements that are present in the alloy are 6% of Aluminium, 4% of Vanadium, 0.25% of Iron, and 0.2% of Oxygen. All these chemicals and metals present in the alloy give it some of the best properties. Titanium can withstand extreme temperatures and conditions.

The thing with titanium is that it is expensive so this application is limited to military and medical and many other applications. This mixture has a solid solubility that changes dramatically with temperature, allowing it to undergo precipitation strengthening. This heat treatment process is carried out after the alloy has worked to its final shape, but allows for much easier fabrication of a high-strength product before it can be used. Alloys Titanium has four categories i.e. alpha alloys, near-alpha alloys, alpha and beta alloys, beta alloys and near-beta alloys. These are just categories and not grades, though the grades are different.

Titanium Grade 2 Tubes is suitable for many applications similar to Grade 1, but is very strong which allows it to be a metal for many applications. Grade 2 has good weldability, strength, ductility, and is used mostly in bar and sheet sizes.

A seamless tube is a type of tube that is commonly used by the world. Seamless tubes are relatively stronger than others and are much stronger. The process of manufacturing a seamless tube is long and complicated, but it all leads to the production of excellent tubes. The seamless Tubes is made using one piece of metal so it is much stronger and highly prevents and leakage and corrosion depends on the type of material used to manufacture the Tubes. The seamless Tubes comes in several size right from 50mm to 500mm or even 1 meter in diameter. The Tubes thickness plays a significant role as it avoids leakage.


The grades mentioned above are used for the following applications- Architecture, Power generation, Medical industry, Hydro-carbon processing, Marine industry, Exhaust pipe shrouds, Airframe skin, Desalination, Chemical processing, Chlorate manufacturing, Aerospace structures, Chemical processing, Medical industry, Marine industry, Airframe components, Cryogenic vessels Heat exchangers, CPI equipment, Condensor tubing, Surgical hardware, Pickling baskets, Chemical processing, Chlorate manufacturing, Desalination, Marine applications, Aircraft turbines, Engine components, Aircraft structural components, Aerospace fasteners, High-performance automatic parts, Marine applications, Sports equipments, Orthopedic pins and screws, Orthopedic cables, Ligature clips, Surgical staples, Springs, Orthodontic appliances, In joint replacements, Cryogenic vessels, Bone fixation devices, Shell and heat exchangers, Hydrometallurgical applications, Elevated temperature chemical manufacturing, Marine and airfare components

Carbon Steel Pipes Are Widely Used in Industries Due to Its Multifarious Specifications

You will always find the black steel pipe in the multifarious industrial department for they are prominently used there. They are available in a wide range of specifications for carbon steel pipes with each of them designed to have high strength and integrity. The carbon steel pipes are made up of carbon and iron as basal materials.

However, since they are built into structures that have no seams, the pipes can also be known as seamless steel pipes. For the incredibly high strength of these steel pipes, the absence of the seams is responsible.

The absence of the seam also explains why, when used to transport flammable gases, the pipes would not release gases. This is the concept that seamless carbon steel pipe manufacturers have adopted. Providing that the component elements are regulated in a planned and acceptable range, the steel will be referred to as carbon steel with respect to the proportion of carbon and iron.

In comparison to this, however, if the proportions of these components are surpassed, the steel will be said to be alloy steel or some other type. Copper at a proportion not exceeding 0.4 percent and manganese at a proportion not exceeding 1.65 are the main elements needed in the formation of carbon steel.

Carbon is introduced as an additive during the manufacturing process to increase the reliability of the steel permits. Based on the carbon content, carbon steel is divided into various groups.

This explains why it’s easy to get on the market with carbon steel. There is a generic identity number allocated to it, regardless of the large variety of carbon steel seamless pipe producers on the world market today. This helps to distinguish from others a trustworthy supplier of seamless steel pipes.

The Carbon steel fittings are significant for the various types of pipe systems. However, depending on the dimensions of the steel pipes, there are various designs of the fittings used to match them. The part of the fittings is important to remember as it should also be made from steel.

With the same component components, just as the basal pipes, it is simpler to ensure that the fittings withstand the same strength. It is crucial to ensure that it fits the diameter of the pipes you are using when considering your choice of fittings. Say that the pipe diameter you’re using is 4 inches, using the available lap joins, you are sure to satisfy your requirements.

It is important to consider this when choosing your seamless carbon steel pipe manufacturer. The bottom line here is that specially crafted fittings are needed for your specialty pipes. For instance, different industries go to meet their different industrial applications for customized multiple black steel pipe specifications.

As they are constructed according to the different applications, it is necessary to understand how to choose a proper steel flange.

These are the Important Three Benefits of Commercial Seamless Steel Pipe

The manufacturing process of commercial seamless steel pipe starts with a solid, round steel billet. This billet is then heated to high temperatures and stretched until it takes the shape of a hollow tube and is pulled over a form.

The Seamless Steel pipes transport fluids such as natural gas, water, waste, and air. There are three manufacturing methods to manufacture seamless steel pipes that exist. A strong, round steel billet begins with the seamless steel pipe manufacturing process. This billet is then heated to high temperatures and stretched until it takes the shape of a hollow tube and is pulled over a form.

What are the benefits of Commercial Seamless Steel Pipe?

There are three important benefits of commercial seamless steel pipes.

Increased Pressure Ratings

The greatest benefit of seamless steel pipes is their improved pressure-resistant capacity. In a welded steel pipe, the weakest point is the welded seam. Unlike welded, Seamless pipe does not have a seam making it similarly solid across the entire diameter of the pipe. It is also much simpler to calculate pressure measurements without being needed to take weld quality into account.

While seamless pipes can often be more costly than welded pipes, this improved pressure-resistant capacity allows you to use thinner and lighter pipes, which can help reduce costs.

Strength under Loads

Seamless steel pipe may often be more costly than other steel pipe types, but it’s also more efficient. This is because, under loading, it has greater intensity. The empty pipe must still support its own weight, but it also needs to support the weight when a pipe is loaded with material or under load. Pipe failures and leaks typically occur in a welded seam. But it is not subject to such failures since the seamless pipe does not have a seam.

In a range of industrial pipe applications, such advantages make seamless steel pipes the preferred material, including shipbuilding, pipelines, oil rigs, oil field equipment, pressure vessels, machinery parts, and offshore rigs. An additional advantage of seamless pipes is that in harsh conditions they perform well, which means they can be used in extremely cold or hot environments.

Uniformity in the Shape of the material

By continuous extrusion of the alloy, the seamless ones are prepared, creating a circular cross-section that anyone can count on.

The shape of the pipe is bent, adds tension & extraneous variable to the pipe during the production process, which never results in a round pipe or hollow rods such as seamless ones, unlike the welded ones, which are prepared by wrapping & welding the sheet on each other. The seamless uniform pipes allow the installation & fittings process to be simple.