Stainless steel pipes are widely used in various industries due to their excellent corrosion resistance and durability. When it comes to stainless steel pipes, two common types are often mentioned: seamless stainless steel pipes and welded stainless steel pipes. Understanding the differences between these two types is critical to making the right choice for your particular application.
Seamless stainless steel pipe, as the name suggests, is manufactured without any welds or joints. They are made by piercing a solid cylindrical blank, which is then extruded over a mandrel to form a hollow tube. This manufacturing process gives the pipe a uniform thickness throughout its length. Seamless stainless steel tubing has excellent structural integrity and is highly resistant to pressure and mechanical stress. They are commonly used in industries requiring high quality and high pressure applications, such as oil and gas, chemical and petrochemical industries.
In contrast, welded stainless steel pipe is manufactured by rolling stainless steel flat strip into a pipe and then welding the edges together. This process creates a seam along the length of the pipe, which may vary slightly in thickness. Welded stainless steel tubing is cost effective and suitable for applications where pressure is not critical. They are commonly used in wastewater treatment, pipelines and low-pressure transportation systems.
One of the main advantages of seamless stainless steel piping is its smooth inner surface, which allows for better flow rates and reduces the risk of corrosion. On the other hand, due to the existence of weld seams, the surface of welded stainless steel pipes may be slightly rough, which may affect the flow efficiency.
It's worth noting that both types of stainless steel tubing can be made from 304 stainless steel, a popular material known for its excellent corrosion resistance, high-temperature strength, and versatility. The choice between seamless or welded tubing depends on your specific application requirements, budgetary considerations, and the importance of aesthetic appearance.
To sum up, the main difference between seamless stainless steel pipe and welded stainless steel pipe lies in its manufacturing process and structural characteristics. Seamless pipe offers superior strength and pressure resistance, while welded pipe is more cost-effective and suitable for less demanding applications. Both types are constructed of 304 stainless steel for excellent corrosion resistance. Ultimately, the choice of seamless and welded stainless steel tubing should be based on the specific needs of the project.
304L Chemical Composition:
| |
C |
Mn |
Si |
P |
S |
Cr |
Ni |
N |
| 304L |
0.03 max |
2.0 max |
0.75 max |
0.045 max |
0.03 max |
18.0 -20.0 |
8.0-12.0 |
0.1 max |
304L Mechanical Properties:
| |
Tensile Strength ksi (min) |
Yield Strength 0.2% ksi (min) |
Elongation % |
Hardness (Brinell) MAX
|
| 304L |
70 |
25 |
40 |
201 |
304L Stainless Steel Applications:
★Food processing equipment, particularly in beer brewing, milk processing, and wine making
★Kitchen benches, sinks, troughs, equipment, and appliances
★Architectural trim and molding
★Automotive and aerospace structural use
★Construction material in large buildings
★Chemical containers, including for transport
★Heat exchangers
★Nuts, bolts, screws, and other fasteners in the marine environment
★Dyeing industry
★Woven or welded screens for mining, quarrying & water filtration
Stainless Steel Seamless Pipe/Stainless Steel Seamless Tube
* Outside Diameter: 4.0mm - 1219.0mm
* Wall Thickness: 0.5mm - 100.0mm
* Length: up to 24m
* Tolerance: According to the standard
* Technique: Hot rolled/Cold drawn/Forged
* Surface: Pickling, Polished, Grit blast, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard: ASTM A312. ASME SA269, ASTM A269, ASME SA213, ASTM A215, ASTM A511, ASTM A789, ASTM A790, ASTM A 268, DIN 2462.1, DIN 17456, DIN 17458, JIS G3463, JIS G3459, GOST 9941, etc.
*Grade: 201, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, 430, 430Ti, 409L, 439, 440C, 446, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
* Processing Service: Bending, Welding, Punching, Cutting, etc.
* Pipe End: BE/PE with cap
PLEASE CONTACT THE SALES TEAM FOR THE DETAILED STOCK LIST
Stainless Steel Welded Pipe/Stainless Steel Welded Tube
* Classification: Stainless steel industry pipe, stainless steel decorative tube
* Outside Diameter: 4.0mm - 1219.0mm
* Wall Thickness: 0.5mm - 20.0mm
* Length: Normally 6.0m, or as requirements
* Tolerance: According to the standard
* Technique: Hot rolled/Cold drawn
* Surface: Pickling, Polished, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard: ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790, DIN 17457, JIS 3459, etc
*Grade: 201, 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, 430, 430Ti, 409L, 439, 440C, 446, S32760, 2205, 904L, 630, 631, 253Ma, 254SMo, Incoloy 926, Inconel 625, Monel 400 etc.
* Processing Service: Bending, Welding, Punching, Cutting, etc.
PLEASE CONTACT THE SALES TEAM FOR THE DETAILED STOCK LIST
Stainless Steel Capillary Pipe/Stainless Steel Capillary Tube
* Outside Diameter: 0.4mm - 16.0mm
* Wall Thickness: 0.1mm - 2.0mm
* Length: Up to 18000mm, or cut into small pieces
* Tolerance: According to the standard
* Technique: (High Precision) Cold drawn
* Surface: Inside and Outside Bright Annealed
* Standard: ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790, DIN 17457, JIS 3459, etc
*Grade: 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, S32760, 2205, 904L, 630, 631,etc
PLEASE CONTACT THE SALES TEAM FOR THE DETAILED STOCK LIST
Stainless Steel Sanitary Pipe/Stainless Steel Sanitary Tube
* Classification: Stainless steel welded sanitary pipe, stainless steel seamless sanitary tube
* Outside Diameter: 6.0mm - 850.0mm
* Wall Thickness: 0.5mm - 6.0mm
* Length: Up to 18000mm, or cut into small pieces
* Tolerance: According to the standard
* Technique: Cold drawn
* Surface: Inside OR Outside Polished
* Standard: ASTM A312, ASME SA269, ASTM A269, ASME SA213, ASTM A213, ASTM A511, ASTM A789, ASTM A790, ASTM A376, ASME SA335, SB161, SB163, SB338, SB667, DIN 2462, DIN 17456, DIN 17458, EN 10216, JIS 3463, JIS G3459, GOST 9941, etc
*Grade: 304, 304L, 316, 316L, 316Ti, 321, 317L, 310S, 347H, S32760, 2205, 904L, 630, 631,etc
PLEASE CONTACT THE SALES TEAM FOR THE DETAILED STOCK LIST
Stainless Steel Square Pipe/Stainless Steel Square Tube
* Classification: Stainless steel welded square pipe, stainless steel seamless square tube
* Side Length: 4.0*4.0mm - 300.0*300.0mm
* Wall Thickness: 0.25mm - 8.0mm
* Length: Normally 6.0m, or cut into small pieces
* Tolerance: According to the standard
* Technique: Cold drawn/Hot Rolled
* Surface: Hairline, Polished, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard: ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790, DIN 17457, JIS G3459, etc
*Grade: 201, 304, 304L, 316, 316L, 321, 317L, etc
PLEASE CONTACT THE SALES TEAM FOR THE DETAILED STOCK LIST
Stainless Steel Rectangular Pipe/Stainless Steel Rectangular Tube
* Classification: Stainless steel welded rectangular pipe, stainless steel seamless rectangular tube
* Side Length: 4.0*6.0mm - 200.0*400.0mm
* Wall Thickness: 0.25mm - 8.0mm
* Length: Normally 6.0m, or cut into small pieces
* Tolerance: According to the standard
* Technique: Cold drawn/Hot Rolled
* Surface: Hairline, Polished, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard: ASTM A312, ASTM A358, ASTM A249, ASTM A269, ASTM A554, ASTM A790, DIN 17457, JIS G3459, etc
*Grade: 201, 304, 304L, 316, 316L, 321, 317L, etc
PLEASE CONTACT THE SALES TEAM FOR THE DETAILED STOCK LIST
Stainless Steel Coil Pipe/Stainless Steel Coil Tube
* Classification: O Type, I Type, W Type, U Type
* Outside Diameter: 6.0 mm - 32.0mm
* Wall Thickness: 0.1mm - 3.0mm
* Length: 150m, 1500m, 1800m, or as requirements
* Tolerance: According to the standard
* Technique: Cold drawn/Hot Rolled
* Surface: Pickling, Polished, 180#, 320#, 400#, Bright Anneal,400#, 500#, 600#
* Standard: ASTM A269, A249, JIS G 43-5, EN 10216
*Grade: 201, 304, 304L, 316, 316L, 904L, S32205, S31803, etc
PLEASE CONTACT THE SALES TEAM FOR THE DETAILED STOCK LIST
Q: What kind of ZYTC company?
A: ZYTC is a professional manufacturer of metals and alloy productions and has its own warehouse with more than 30,000 tons capacity. We are working hard to open up the international market. At the same time, we will encounter a variety of purchase orders, In order to meet customer requirements and improve services, we will also distribute some kinds of metal products, of course, our strict procurement management and quality management departments can guarantee excellent quality of all products.
Q: What certificate does ZYTC have?
A: ZYTC acquired the ISO 14001 environmental management system certificate, 0HSAS18001 occupational health and safety management system certificate, and ISO 9001 quality management system certificate.
Q: What's your purchasing system?
A: Our procurement system adopts the 5R principle to ensure the "right quality" from the "right supplier" with the "right quantity" of materials at the "right time" with the "right price" to maintain normal production and sales activities. At the same time, we strive to reduce production and marketing costs to achieve our procurement and supply goals: close relationships with suppliers, ensure and maintain supply, reduce procurement costs, and ensure procurement quality.
Q: Who are your cooperate partners?
A: ZYTC has a very good relationship with world-known factories, such as Baosteel, TISCO, ZPSS, JISCO, ATl, SMC, HAYNES, VDM, ArcelorMittal, etc.
Q: What are your company's payment methods?
A: 30% T/T deposit, 70% T/T balance payment before shipment. More payment methods depend on your choices.
Q: Can you accept small orders?
A: If we have the exact materials in stock, we can deliver even 1 piece. If we don't have the goods in stock, the MOQ is normally 1 ton.
Q: Do you guarantee the safe and reliable delivery of products?
A: Yes, we always use high-quality packaging for shipping. We usually pack the products with a soft material such as polyethylene foam and then pack it in wooden cases to ensure the safety of the product in the process of transportation.
Q: Does ZYTC provide processing services?
A: Yes, we also provide processing services to the outside world, and providing professional services is one of our goals. Such as bending, water cutting, laser cutting, digging holes, welded, slit coil, and other processing according to the drawings.
Q: How to guarantee the quality?
A: Each production procedure will be subject to testing and evaluation. from the very choice of raw materials to the package for shipment. Only the products surviving all the tests are delivered for export.
Q: What if there is a quality problem?
A: We also keep a piece of the sample before shipping. After comparing the buyer's test result, and it turns out to be our problem, we will return the money back and pay for your lost or delivery of qualified materials again.
Q: Can you provide samples?
A: As a professional company, we know that the quality of products is valued by each customer, especially for international trade, we understand the customer's worries, so we can provide samples to customers, and we can ensure the consistency of the quality of samples and batch product products. The sample is free, but the buyer should pay the freight fee. And the freight fee will be returned in the future order.
Q: How about the delivery time?
A: Stock products can be shipped within 3 days. Customized product delivery time is normally 25 working days, but it is also influenced by the specific requirements or the order quantity. Partial shipment is allowed.
Audited Supplier 
Stainless steel pipes are widely used in various industries due to their excellent corrosion resistance and durability. When it comes to stainless steel pipes, two common types are often mentioned: seamless stainless steel pipes and welded stainless steel pipes. Understanding the differences between these two types is critical to making the right choice for your particular application.
){kind=link}
){kind=link}