Welded Stainless Steel Tube

Welded stainless steel tube is produced in a wide range of sizes and grades for various applications, welded tube is manufactured through roll-forming strips or sheets of stainless steel into a tube shape and then welding the seam longitudinally, welded tubes conform to ASTM A249, A269, A270, A312, A789 and EN specifications, there are many grades for options, these grades include 304/304L, 316/316L, 321 and duplex steel grades.

Welded Tubes can be finished in as welded, welded and drawn, polished, and bright annealed conditions, our tubes are strictly in accordance with ASTM and international standards, and all the tubes are conducted by non-destructive testing and destructive testing, these tests include eddy current and ultrasonic and pressure testing, professional manufacturing and tests are to ensure consistent weld and high quality.

Welded Stainless Steel Tube 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

EN Steel No.

1.4301, 1.4306, 1.4315, 1.4303, 1.4833, 1.4845, 1.4401, 1.4571, 1.4404, 1.4429, 1.4438, 1.4541, 1.4550, 1.4477, 1.4462, 1.4002, 1.4512, 1.4016, 1.4113, 1.4509, 1.4521, 1.4006, 1.4021, 1.4028

Welded Tube Sizes

We have a large variety of rollers, allowing us to manufacture tight tolerance tubing in a wide range of OD and wall thickness dimensions, and in a variety of shapes including round, square, rectangular and oval.

• BWG Gauge Chart
• Fractional, Metric, and Imperial Sizes
• Pipe Schedule Chart, Pipe Size Chart, NPS Pipe Diameter
• Stainless Steel Tube Weight
• Stainless Steel Tubing Sizes

Welded Tube Processing

• Bright annealed
• Pickling
• Outer surface brushing
• Inner and outer surface polishing
• Inner and outer surface mirror polishing
• Bead rolling or weld seam removing
• Customer defined tolerances
• Cut to length
• U bend welded tubes
• Tubes individually sleeved
• Welded coil tubing

Applications of Stainless Steel Tubing

Heat Exchanger, Boiler, Condenser

• ASTM A249 stainless steel tube, covering Welded Austenitic Steel Boiler, Superheater, Heat-Exchanger, and Condenser Tubes, the tubing sizes and thicknesses usually furnished to this specification are ¹/₈ in. [3.2 mm] in inside diameter to 12 in. [304.8 mm] in outside diameter and 0.015 to 0.320 in. [0.4 to 8.1 mm], inclusive, in wall thickness.
• ASTM A269 stainless steel tubing, covering Seamless and Welded Austenitic Stainless Steel Tubing for General Service, the tubing sizes and thicknesses usually furnished to this specification are ¹/₄ in. [6.4 mm] in inside diameter and larger and 0.020 in. [0.51 mm] in nominal wall-thickness and heavier.
• ASTM A268 stainless steel tubing, covering standard specification for a number of grades of nominal-wall-thickness, welded ferritic and martensitic stainless steel tubing for general corrosion-resisting and high-temperature service.
• ASTM A789 stainless steel tubing, covering standard requirements for grades of nominal wall thickness, and stainless steel tubing for services requiring general corrosion resistance, with particular emphasis on resistance to stress corrosion cracking. These steels are susceptible to embrittlement if used for prolonged periods at elevated temperatures. 

Mechanical Purpose

• ASTM A554 stainless steel tubing, covering welded austenitic, ferritic, and austenitic-ferritic duplex stainless steel mechanical tubing intended for use in ornamental, structural, exhaust, and other applications where appearance, mechanical properties, or corrosion resistance is needed. As-welded or cold-reduced mechanical tubing in sizes to 16 in. (406.4 mm) outside dimension, and in wall thicknesses 0.020 in. (0.51 mm) and over.
• EN 10296-2, Welded circular steel tubes for mechanical and general engineering purposes

Sanitary Tubing

• ASTM A270 stainless steel sanitary tubing, covering grades of seamless, welded, and heavily cold-worked austenitic and ferritic/austenitic stainless steel sanitary tubing, tubes in sizes up to and including 12 in. [300 mm] in outside diameter.
• EN 10357 Austenitic, austenitic-ferritic and ferritic longitudinally welded stainless steel tubes for the food and chemical industry.

Welded Tubes Quality Control

In all stages from raw material to finished products, tube is manufactured under strict quality control, making sure tube has stable mechanical properties, excellent surface finish and high dimensional accuracy. Specialty testing services can also be provided.

Welding Methods

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

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

Popular tube and pipe manufacturing techniques are described below.

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