Stainless Steel Welded Pipe

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Our staff are qualified and certified according to all current welding procedures, thus guaranteeing our customers longitudinally welded stainless steel pipes in line with the requirements.
Large size SS 304 stainless pipe
stainless steel welded pipe for food hygiene

A wide range of effective production facilities offers you a large number of possibilities:

  • Corrosion resistant pipes with outer diameters from 15 to 2 032 mm (80 inch) and wall thicknesses up to 70 mm
  • Pipes are made from special alloys, titanium or clad materials
  • Pipes with demanding tolerance requirements
  • Pipes in special geometric shapes
  • Pipes according to internationally valid standards, including DIN, DIN EN, DIN EN ISO, NORSOK, API and ASTM
Large size SS 304 stainless pipe
Large size SS 304 stainless pipe

The general features of our DSSP: superior corrision resistance, such as pitting corrosion, crevice corrosion, abrasion corrosion; better weldability and mechanical properties; excellent intergranular corrosion resistance and better cost- effectiveness.

Stainless steel can withstand corrosive or chemical environments due to its smooth surface.

  • NPS: 1/8" through 24"
  • Schedules: 5, 10, 10S, 20, 30, 40, 40S, 80, 80S
  • Specifications: ASTM A312, ASME SA312

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. Type 302 has 18% chromium and 8% nickel.

316/316L Stainless Steel

Type 316/316L Stainless Steel is a molybdenum steel possessing improved resistance to pitting by solutions containing chlorides and other halides.

310S Stainless Steel

310S Stainless Steel 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.

Duplex 2205 (UNS S31803)

Duplex 2205 (UNS S31803), 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..

DUPLEX UNS S32760

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

Product Specification and Size

Stainless Steel Seamless Tubes 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. In addition, engaging in bending, torsional strength of the same, lighter, and they are also widely used in the manufacture of mechanical parts and engineering structures.

Available Specification
Product NameExecutiveDimensionSteel Code / Steel Grade
Industrial PipesASTM A312, A358, A778 JIS G3459OD: 1/4"-40"
WT: SCH5S-SCH80S		TP304, TP304L, TP316L SUS304TP
Tubes for Boiler and Heat-Exchanger, General Service TubingASTM A249, A269 JIS G3463OD: 15.9-139.8mm
WT: 1.6-5.0mm		TP304, TP304L, TP316L SUS304TB
Mechanical and Structural TubesASTM A554 JIS G3446OD: 7.9-152.4mm
WT: 0.5-6.5mm		MT304, MT304L, MT316L, MT430 Grade 201, 202 as per mill's STD SUS304
Square TubesASTM A554OD: 12.7x12.7-150x150mm
WT: 0.7-6.5mm		MT304, MT304L, MT316L,MT430 Grade 201, 202 as per mill's STD
Rectangular TubesASTM A554OD: 10x20-100x200mm
WT: 0.7-6.5mm		MT304, MT304L, MT316L,MT430 Grade 201, 202 as per mill's STD
Sanitary TubingASTM A270
JIS G3447		OD: 25.4-165.2mm
WT: 0.8-3.05mm		TP304, TP304L, TP316L SUS304TBS
Large Gauge Pipes for Ordinary PipingJIS G3448OD: 15.88-318.5mm
WT: 0.8-3.0mm		SUS304TPD
Large Diameter PipesJIS G3468OD: 14"-40"
WT: SCH5S-SCH40S		SUS304TPY
Chemical Composition & Mechanical Property

Chemical Composition (For Reference)

Steel GradeC% Max.Si% Max.Mn% Max.P% Max.S% Max.Cr% Max.Ni% Max.Mo% Max.Ti% Max.Other
SUS 2010.151.05.5-7.50.060.0316.0-18.03.5-5.5--N:0.25
SUS 2020.151.07.5-10.00.060.0317.0-19.04.0-6.0--N:0.25
SUS 3040.081.02.00.0450.0318.0-20.08.0-10.5---
SUS 304L0.031.02.00.0450.0318.0-20.09.0-13.0--Cu:1.0-3.0
SUS 316L0.031.02.00.0450.0316.0-18.012.0-15.02.0-3.0--
SUS 4300.120.751.00.040.0316.0-18.0----

Mechanical Property (For Reference)

Steel GradeN/mm 2 MIN.
Tensile Stress		N/mm 2 MIN.
Proof Stress		Elongation MIN.HRB MAX. HardnessBendability:Bending AngleBendability:Inside Radius
SUS 20152027540100No Require-
SUS 2025202754095No Require-
SUS 3045202054090No Require-
SUS 304L4801754090No Require-
SUS 316L4801754090No Require-
SUS 4304502052288180°1.0 time the thickness

the main requirement for stainless steels is that they should be corrosion resistant for a specified application or environment. The selection of a particular "type" and "grade" of stainless steel must initially meet the corrosion resistance requirements.

Welded Tube Standard Specifications
SpecificationsTube Pipe TypeMaterialApplications
ASTM A249WeldedAustenitic SteelBoiler, Superheater, Heat Exchanger, And Condenser
ASTM A268Seamless And WeldedFerritic And Martensitic Stainless SteelGeneral Service
ASTM A269Seamless And WeldedAustenitic Stainless SteelGeneral Service
ASTM A270Seamless And WeldedAustenitic And Ferritic / Austenitic Stainless SteelSanitary Tubing
ASTM A312Seamless, Welded, And Heavily Cold WorkedAustenitic Stainless SteelHigh-Temperature And General Corrosive Service
ASTM A358WeldedAustenitic Chromium-Nickel Stainless SteelHigh-Temperature Service And General Applications
ASTM A554WeldedStainless SteelMechanical Tubing
ASTM A688Seamless And WeldedAustenitic Stainless SteelFeedwater Heater
ASTM A789Seamless And WeldedFerritic/Austenitic Stainless SteelGeneral Service
ASTM A790Seamless And WeldedFerritic/Austenitic Stainless SteelGeneral Service
EN 10217-7WeldedStainless SteelPressure And Corrosion Purpose
EN 10312WeldedStainless SteelWater And Other Liquids

Additional mechanical or physical properties may also need to be considered to achieve the overall service performance requirements.

Welding Methods:

Welded stainless steel tube is made from long strip or sheet, passed a rolling machine, then the strip edges is welded longitudinally and melt together, using various welding processes, making welding beam is as same as base metal, and form into tube shape.

The sheet width is desired tube outside diameter, the width should be calculated before manufacturing.

TIG

Tungsten Inert Gas welding, another name for Gas tungsten arc welding (GTAW), is an arc welding process that uses a non-consumable tungsten electrode to produce the weld. The weld area and electrode is protected from oxidation or other atmospheric contamination by an inert shielding gas.

EFW

Electric Fusion Welding, Electric Fusion Welding (EFW steel pipe) refers to an electron beam welding, the use of high-speed movement of the electron beam directed impact kinetic energy is converted to heat the workpiece so that the workpiece leaving the melt, the formation of the weld. It is mainly used for welding dissimilar steel welding sheet or which high power density, metal weldment can rapidly heated to high temperatures, which can melt any refractory metals and alloys.

ERW

Electric Resistance Welding, high-frequency electrical current is passed between the material edges, then the edges are forced together under pressure as a butt joint and then welded by heating the material to high temperatures.

DSAW

Double Submerged arc welded, similar to other pipe manufacturing processes, the manufacture of Double Submerged Arc Welded Pipe involves first forming steel plates into cylindrical shapes. The edges of the rolled plate are formed so that V-shaped grooves are formed on the interior and exterior surfaces at the location of the seam. The pipe seam is then welded by a single pass of an arc welder on the interior and exterior surfaces.

LSAW

Longitudinal Submerge-arc Welded, LSAW (Longitudinally Submerged Arc Welded Steel pipes) in leaflets plate as raw material, the steel plate in the mold or molding machine pressure (volume) into using double-sided submerged arc welding and flaring from production.

HFW

High Frequency Welding, HFW welded steel pipes are widely preferred in Oil, Natural Gas, Water and other liquids transportation and distribution lines, heating, cooling, ventilation piping and steel structures for construction and other general purposes by means of precise production tolerances and high capacity manufacturing method.

Heat treatment is generally required after manufacture, this process improves stainless steel welded tube properties, help welded tube suitable for wide applications.

Welded Tubes Quality Control:

All stages from raw material to finished products, tube manufactured under strict quality control, making sure tube having stable mechanical properties, excellent surface finish and high dimensional accuracy.

Standard Testing

  • Tensile Strength test
  • Flattening test
  • Flare test
  • Flange test
  • Dimensional inspection
  • PMI
  • Hardness test
  • Eddy Current test

Optional Testing

  • Ultrasonic test
  • Hydrostatic test
  • Air Under Water test
  • Grain Size
  • Corrosion test
  • Metallographic
  • Radiographic test.

Welded Tube VS Seamless Tube:

There are differences between welded tube and seamless in manufacturing, typical appearance is that welded have welding seam, without or with additional filler metal, but seamless tube have not.

Size Range

Welded tube can be produced in a wide range sizes and dimensions, both large diameter and small diameter, it is hard to produce very large size and very thin wall seamless tube.

Production Time

Welded tube have short production time, because it posses more simple manufacturing process, in most condition, for seamless tube, several producing processes are needed to duplicate, such as cold rolling, heat treatment.

Working Pressures

Working pressures of the welded tube are approximately 20% less than the seamless tube, seamless tube is better selection use in harsh environment.

Production Cost

Obviously, welded tube is effective cost choice for many applications, seamless tube have higher price, but it is also durable.

Tolerance

Welded tubes have excellent concentricity, tight tolerance in outside diameter and wall thickness.

Inspection & Quality Control:

With a complete set of advanced testing equipment, we have the following Regular Testing Items:

  • Chemical Composition Analyzing;
  • Metallographic Test ;
  • Mechanical Properties Test;
  • Hydraulic Test;
  • Non-destructive Test, including X-Ray Flaw Detection;
  • Dimensional Checking;
  • Flattening
  • Flare & Flange
  • Reverse Bend
  • Reverse Flattening
  • Tensile Strength
  • Hardness
Enquiry/Ordering Information :
  • Material Grade
  • NB Pipe Size or Outside Diameter
  • Wall Thickness, Length - Random/Standard/Specific
  • Finish Required
  • Relevant Specification
  • Application/End use
Finishes :
  • As welded
  • Welded & externally polished
  • Welded Annealed & Pickled
  • Welded Cold Drawn Annealed & Pickled
  • Welded Cold Drawn Annealed Pickled & externally polished
  • Other Finishes as per customers requirement

Also used in producing all kinds of conventional weapons, the barrel, artillery shells and so on.

Custom Grades of Stainless Steel Tube

  • Austenitic: 201, 304/304L, 316/316L, 317/317L, 347/347H, 321/321H, 904L
  • Ferritic: 409, 430, 439, 441, 434, 436, 444, 446
  • Martensitic: 403, 410, 410S, 414/L, 441, 418, 420, 440, 416
  • Duplex: 2205/S31803, S32750, S32760

Common Applications for Stainless Steel Tubing Stainless steel tubing has a number of uses in a wide variety of industries. It can be used during manufacturing in processing plants or can become part of a final product. Stainless steel tubing can also be used in pipelines to transport oil, gas, water, or chemicals.

Range of application

Stainless steel pipe (tube) has excellent characteristics of corrosion resistance and smooth finishing. Stainless steel pipe (tube) is commonly used in demanding equipment like automobiles, food processing, water treatment facilities, oil and gas processing, refinery and petrochemicals, breweries and energy industries.

The stainless steel tubing that is supplied by SunnySteel can used in a variety of industries, including:

  • 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

The main requirement for stainless steels is that they should be corrosion resistant for a specified application or environment. The selection of a particular "type" and "grade" of stainless steel must initially meet the corrosion resistance requirements.

Additional mechanical or physical properties may also need to be considered to achieve the overall service performance requirements.

Tech & Grade for Stainless steel:

Stainless steel is one of the more standardized materials in the building and engineering industries.

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