Seamless stainless steel pipe

A seamless pipe, as the name suggests, is a pipe without a seam or a weld-joint. Seamless pipes are thought to be able to withstand higher pressure, higher temperatures, higher mechanical stress and a corrosive atmosphere. It can be found in a wide range of applications such as in oil and gas, refinery, petrochemical, chemical, fertilizer, power, automotive, bearing, mechanical and structural.

Seamless stainless steel pipe

It is the resistance of air, steam, water and other weak corrosive media and acid, alkali, salt and other chemical etching medium corrosion of steel pipes. Also known as acid - resistant stainless steel. It will be more and more engineering use and become increasingly popular, and prospects.

The production of our seamless steel pipes is tightly regulated and all of the pipes we stock have been fully tested to international standards to ensure we only supply the highest quality products.

We offer

Our seamless pipes are manufactured in l in accordance with:

Dimensions in accordance with:

Seamless stainless steel pipe specification and size

Seamless stainless steel pipe is a hollow steel bar, a large number of pipes used for conveying fluids, such as oil, gas, water, gas, steam,heat exchanger,mechinical machine.

Product Name Executive Dimension Steel Code / Steel Grade
Seamless Austenitic Stainless Steel Pipes ASTM A312, A312M ASME SA312 / SA312M OD: 1/4"-20"
TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H
Seamless Austenitic Stainless Steel Tubing for General Service ASTM A269 ASME SA269 OD: 6.0-50.8mm
WT: 0.8-10.0mm
TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H
Seamless Austenitic Alloy-Steel Boiler, Super Heater and Heat-Exchanger Tubes ASTM A213 / A213M ASME SA213 / SA213M OD: 6.0-50.8mm
WT: 0.8-10.0mm
TP304, TP304L, TP304H, TP310, TP310S, TP316, TP316L, TP316Ti, TP317, TP317L, TP321, TP321H, TP347, TP347H
Seamless Duplex Stainless Steel Tubing for General Service ASTM A789 / A789M OD: 19.0-60.5mm
WT: 1.2-5.0mm
S31803, S32205, S32750
Seamless Duplex Stainless Steel Pipes ASTM A790 / A790M OD: 3/4"-10"
S31803, S32205, S32750
Seamless Stainless Steel Mechanical Tubing ASTM A511 OD: 6.0-50.8mm
WT: 0.8-10.0mm
MT304, MT304L, MT304H, MT310, MT310S, MT316, MT316L, MT317, MT317L, MT321, MT321H, MT347
Seamless Stainless Steel Tubes for Pressure Purposes EN 10216 DIN 17456, 17458 OD: 6.0-530.0mm
WT: 0.8-34.0mm
1.4301, 1.4307, 1.4541, 1.4401, 1.4404, 1.4571, 1.4878, 1.4432, 1.4462
Chemical Composition (For Reference)
Steel Grade C% Max. Si% Max. Mn% Max. P% Max. S% Max. Cr% Max. Ni% Max. Mo% Max. Ti %马克斯。 Other
SUS 304 0.08 1.0 2.0 0.045 0.03 18.0-20.0 8.0-10.5 - - -
SUS 304L 0.03 1.0 2.0 0.045 0.03 18.0-20.0 9.0-13.0 - - 铜:1.0 - -3.0
SUS 310S 0.08 1.5 2.0 0.045 0.03 24.0-26.0 19.0-22.0 - - -
SUS 316L 0.03 1.0 2.0 0.045 0.03 16.0 - -18.0 12.0-15.0 2.0-3.0 - -
SUS 321 0.08 1.0 2.0 0.045 0.03 17.0-19.0 9.0-13.0 - 5XC MIN -
Mechanical Property (For Reference)
Steel Grade N/mm2MIN.
Proof Stress
Elongation MIN. HRB MAX. Hardness Bendability:Bending Angle Bendability:Inside Radius
SUS 304 520 205 40 90 No Require -
SUS 304L 480 175 40 90 No Require -
SUS 310S 520 205 40 90 No Require -
SUS 316L 480 175 40 90 No Require -
SUS 321 520 205 40 90 No Require -

Material stainless steel grades

Also known as "marine grade" stainless steel due to its increased ability to resist saltwater corrosion compared to type 304. SS316 is often used for building nuclear reprocessing plants.

304/304L Stainless Steel

304 Stainless is a low carbon (0.08% max) version of basic 18-8 also known as 302.

316/316L Stainless Steel

Type 316 is more resistant to atmospheric and other mild environments than Type 304.


310年代不锈钢has excellent resistance to oxidation under constant temperatures to 2000°F.

317L Stainless Steel

317L is a molybdenum bearing austenitic chromium nickel steel similar to type 316, except the alloy content in 317L is somewhat higher.

321/321H Stainless Steel

Type 321 is basic type 304 modified by adding titanium in an amount at least 5 times the carbon plus nitrogen contents.

410 Stainless Steel

Type 410 is a martensitic stainless steel which is magnetic, resists corrosion in mild environents and has fairly good ductility.


2205双(不成功)S31803母材, or Avesta Sheffield 2205 is a ferritic-austenitic stainless steel.

Duplex 2507 (UNS S32750)

Duplex 2507 (UNS S32750) is a super duplex stainless steel with 25% chromium, 4% molybdenum..


UNS S32760 is described as a super duplex stainless with a microstructure of 50:50 austenite and ferrite.

SA 269

ASTM A269 / A269M Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

SA 249 Stainless Steel

ASME SA 249 Standard Specification for Welded Austenitic Steel Boiler,
Superheater, Heat-Exchanger, and Condenser Tubes.

904L Stainless steel

904L stainless steel consists of chromium, nickel, molybdenum and copper contents, these elements give type 904L stainless steel excellent properties


Stainless steel seamless pipe can resist high temperatures for cleanliness and maintain the purity of materials which contact stainless steel directly. Stainless steel pipe and tubing are used in chemical plants, aviation fields, marine equipment, cryogenic transportation, medical and architectural industries.

  • Machinery Parts
  • Pharmaceutical
  • Biotechnology
  • Automotive
  • Oil and Gas
  • Marine
  • Food and Beverage Processing
  • Construction
  • Automotive industries
  • Food processing
  • Water treatment facilities
  • Breweries and energy industries
304 (0Crr18Ni9)Seamless stainless steel pipe

304 (0Crr18Ni9)Seamless stainless steel pipe

Stainless steel seamless pipe features:

First, the thicker the wall thickness of the product, it is more economical and practical, the wall thickness of the thinner, its processing costs will rise substantially;

Secondly, the process of the product determines its limitations, the low accuracy of the general seamless tube: non-uniform wall thickness, the appearance of low brightness tube, the high cost of fixed length, and within the appearance of pitting, black spots difficult to remove; Third, the detection and plastic must be offline processing. So it is at high pressure, high strength, the mechanical structure timber reflects its superiority.

The corrosion resistance of stainless steel seamless pipe depends on the alloying elements contained in the steel. Chromium is the basic elements of corrosion resistance for the stainless steel, about 12% the amount of chromium in the steel, chromium and oxygen role in the corrosive medium, the steel surface to form a thin oxide film (passive film) matrix can prevent the steel from further corrosion. Removing chromium, stainless steel seamless pipe commonly used alloying elements there are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of the various uses of the organization and performance of stainless steel.

Delivery requirment:

Capped end stainless steel tube

  • Package: knitting strip bundle, wooden box or steel box
  • Mill test certificate: according to EN 10204 3.2
  • Inspection: Third party inspection, or by clints
Capped end stainless steel tube
Tubes putted in wooden boxes

Tubes putted in wooden boxes

  • Marking: SunnySteel, material grade, standard, specification, heat no.

The wooden boxes packing for stainless products

  • Surface Treatment: Bright annealed, polished outside and inside surface.
Stainless Steel Seamless Pipes
Stainless Steel Seamless Pipes


Pipe size range:

  • Outside diameter: range from 6mm to 530mm.
  • Wall thickness: SCH5S, SCH10S, SCH40S, SCH80S, SCH 120S
  • Legnth: unbending length or fix length