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Stainless Steel Welded Pipes / Tubes

Welded stainless steel tubes have rust resistance and excellent high temperature resistance.

Stainless steel contains chromium which provides the properties of corrosion resistance at high temperatures. Stainless steel can withstand corrosive or chemical environments due to its smooth surface. Stainless steel products are safe for long-term use with excellent resistance of corrosion fatigue.

Stainless Pipes are made from more than 20 steel grades of various corrosion resistance and are intended for application in conditions of a wide range of corrosion environments and temperatures in heat exchanger.

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

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

Product Specification and Size :

Available Specification

Product Name
Executive
Dimension
Steel Code / Steel Grade
Industrial Pipes
ASTM A312, A358, A778
JIS G3459
OD: 1/4″~40″
WT: SCH5S~SCH80S
TP304, TP304L, TP316L
SUS304TP
Tubes for Boiler and Heat-Exchanger, General Service Tubing
ASTM A249, A269
JIS G3463
OD: 15.9~139.8mm
WT: 1.6~5.0mm

TP304, TP304L, TP316L
SUS304TB

Mechanical and Structural Tubes
ASTM A554
JIS G3446
OD: 7.9~152.4mm
WT: 0.5~6.5mm
MT304, MT304L, MT316L, MT430
Grade 201, 202 as per mill’s STD
SUS304
Square Tubes
ASTM A554
OD: 12.7×12.7~150x150mm
WT: 0.7~6.5mm
MT304, MT304L, MT316L,MT430
Grade 201, 202 as per mill’s STD
Rectangular Tubes
ASTM A554
OD: 10×20~100x200mm
WT: 0.7~6.5mm
MT304, MT304L, MT316L,MT430
Grade 201, 202 as per mill’s STD
Sanitary Tubing
ASTM A270
JIS G3447
OD: 25.4~165.2mm
WT: 0.8~3.05mm
TP304, TP304L, TP316L
SUS304TBS
Large Gauge Pipes for Ordinary Piping
JIS G3448
OD: 15.88~318.5mm
WT: 0.8~3.0mm
SUS304TPD
Large Diameter Pipes
JIS G3468
OD: 14″~40″
WT: SCH5S~SCH40S
SUS304TPY

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

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.

  • 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

Chemical Composition & Mechanical Property

Chemical Composition (For Reference)

Steel Grade C% Max. Si% Max. Mn% Max. P% Max. S% Max. Cr% Max. Ni% Max. Mo% Max. Ti% Max. Other
SUS201 0.15 1.0 5.5~7.5 0.06 0.03 16.0~18.0 3.5~5.5 N: 0.25
SUS202 0.15 1.0 7.5~10.0 0.06 0.03 17.0~19.0 4.0~6.0 N: 0.25
SUS304 0.08 1.0 2.0 0.045 0.03 18.0~20.0 8.0~10.5
SUS304L 0.03 1.0 2.0 0.045 0.03 18.0~20.0 9.0~13.0
SUS316L 0.03 1.0 2.0 0.045 0.03 16.0~18.0 12.0~15.0 2.0~3.0
SUS430 0.12 0.75 1.0 0.04 0.03 16.0~18.0 0.60

Mechanical Property (For Reference)

Steel Grade N/mm 2 MIN.
Tensile Stress
N/mm 2 MIN.
Proof Stress
% MIN.
Elongation
HRB MAX.
Hardness
Bendability:
Bending Angle
Bendability:
Inside Radius
SUS201 520 275 40 100 No Require
SUS202 520 275 40 95 No Require
SUS304 520 205 40 90 No Require
SUS304L 480 175 40 90 No Require
SUS316L 480 175 40 90 No Require
SUS430 420 205 22 88 180° 1.0 time the thickness

Welded Tube Standard Specifications

Specifications Tube Pipe Type Material Applications
ASTM A249 Welded Austenitic Steel Boiler, Superheater, Heat Exchanger, And Condenser
ASTM A268 Seamless And Welded Ferritic And Martensitic Stainless Steel General Service
ASTM A269 Seamless And Welded Austenitic Stainless Steel General Service
ASTM A270 Seamless And Welded Austenitic And Ferritic / Austenitic Stainless Steel Sanitary Tubing
ASTM A312 Seamless, Welded, And Heavily Cold Worked Austenitic Stainless Steel High-Temperature And General Corrosive Service
ASTM A358 Welded Austenitic Chromium-Nickel Stainless Steel High-Temperature Service And General Applications
ASTM A554 Welded Stainless Steel Mechanical Tubing
ASTM A688 Seamless And Welded Austenitic Stainless Steel Feedwater Heater
ASTM A789 Seamless And Welded Ferritic/Austenitic Stainless Steel General Service
ASTM A790 Seamless And Welded Ferritic/Austenitic Stainless Steel General Service
EN 10217-7 Welded Stainless Steel Pressure And Corrosion Purpose
EN 10312 Welded Stainless Steel Water 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.

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