Name: Stainless Steel Seamless Pipes
Brand: Sagar Steel Corporation
Availability: InStock
Rating: 5 (24 reviews)

Question 1

What is the difference between ERW and seamless stainless steel pipe?

Accepted Answer

The primary difference between ERW (Electric Resistance Welded) and seamless stainless steel pipes lies in their manufacturing processes and structural characteristics. Seamless stainless steel pipes are made by extruding a solid billet of steel to create a pipe with no weld seam, which gives them uniform strength and makes them suitable for high-pressure and high-temperature applications. ERW pipes, on the other hand, are made by rolling a sheet of stainless steel and welding the seam longitudinally using electric resistance welding. While ERW pipes are generally more cost-effective and have a smooth surface, they may not be as strong or reliable as seamless pipes under extreme pressure or temperature conditions. The choice between the two depends on the application's requirements for strength, durability, and budget.

Question 2

How do you make seamless stainless steel pipes?

Accepted Answer

Seamless stainless steel pipes are made through a process that involves piercing and extrusion. The process begins with a solid cylindrical piece of stainless steel, called a billet. The billet is heated to a high temperature and then pierced through the center using a rotary piercing mill to create a hollow tube. This initial hollow tube is then elongated and formed into a seamless pipe by stretching or extruding it over a mandrel or using a series of rollers to achieve the desired diameter and wall thickness. The pipe is then further processed, including heat treatment, to improve its mechanical properties, and is cut to the required length and subjected to quality inspections to ensure it meets the necessary standards. The result is a strong, seamless stainless steel pipe with no welded joints.

Question 3

What is the material of seamless pipe?

Accepted Answer

Seamless pipes can be made from a variety of materials depending on the application and performance requirements. Common materials include carbon steel, stainless steel, alloy steel, and in some cases, non-ferrous metals like copper, nickel, and titanium. Stainless steel seamless pipes, for instance, are typically made from grades such as 304, 316, 321, and duplex stainless steels like 2205. These materials are chosen for their specific properties, such as strength, corrosion resistance, or heat resistance, making seamless pipes suitable for demanding environments in industries like oil and gas, petrochemicals, power generation, and more.

Specifications	Astm, Asme, Din, Nfa, Jis
Thickness	4.0mm, 100mm
Pipes Size	1/8” Nb, 24” Nb, 1/4” Od, 24” Od Sizes
Tubes Size	1/2″ Od, 8″ Od
Length:	Cut Length, Single Random, Double Random, Fix Length, Required Length
End	Beveled End, Plain End, Threaded

Category	Details
Product	Stainless Steel Seamless Pipes
Manufacturing	Hot finished / cold drawn seamless pipe (no longitudinal weld)
Common standards	ASTM A312 / ASME SA312 (process pipe) • ASTM A213 / SA213 (boiler/heat exchanger tube) • ASTM A269 (instrumentation tube) • ASTM A511 (mechanical tube) • ASTM A999 (general requirements for SS pipe)
Common grades	304/304L (UNS S30400/S30403) • 316/316L (UNS S31600/S31603) • 310/310S • 321 • 347/347H • 904L • Duplex 2205 • Super Duplex 2507(as required)
Size range (typical)	NPS 1/8" to 24" (seamless availability depends on grade & wall)
Wall thickness	SCH 5S / 10S / 40S / 80S and custom thickness as per requirement
Length	Random / double random / fixed cut lengths
End types	Plain end (PE), bevel end (BE), threaded (on request)
Surface finish	Pickled & passivated (standard), bright annealed (for certain tubing), polished (on request)
Supply condition	Typically solution annealed; tubing may be bright annealed depending on spec
Typical properties (summary)	Good corrosion resistance, good formability, wide temperature capability; 316/316L better in chlorides than 304/304L
Typical tests	Hydrotest or NDT as per spec, PMI (on request), dimensional checks, visual, chemical & mechanical tests; UT/ET commonly for tubing
Documentation	MTC as per EN 10204 3.1 / 3.2, heat number traceability, test reports
Typical applications	Chemical/process piping, oil & gas utilities, food/pharma, heat exchangers, boilers, water treatment, marine services, structural/mechanical use (grade-dependent)

Grade	Key benefit	Typical use
304/304L	General corrosion resistance, economical	Water/utility lines, food equipment, general process
316/316L	Better chloride resistance (Mo added)	Marine/coastal, chemical, pharma, higher corrosion risk
321 / 347	Stabilized against sensitization	High-temp piping, welded systems, cyclic heating
310/310S	High-temperature oxidation resistance	Furnaces, heat treatment, high-temp piping
904L	Strong in acids (esp. sulfuric), high Ni/Mo/Cu	Acid handling, chemical plants
Duplex 2205	High strength + chloride SCC resistance	Offshore, desalination, chemical processing
Super Duplex 2507	Very high pitting/crevice resistance	Seawater/brine, aggressive chloride service

Stainless Steel Seamless Pipes

Stainless Steel Seamless Pipes Manufacturer in India

Stainless Steel Seamless Pipes - Information Table

Common Grades (Quick Selection Guide)

Type of Sub-products

304 Stainless Steel Seamless Pipe

316 Stainless Steel Seamless Pipe