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Home > Products > STEEL PIPE&TUBE > Welded Steel Pipes > Special Welded Tubes

Stainless Steel Square / Rectangular Tubes

Our supply of stainless steel square tube and rectangular tube offerings are available in a wide variety of sizes and wall thicknesses.

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They are supplied in both mill finish and polished finishes, with the polished finishes including #4, #6 and #8 mirror finish.

They are generally supplied in 20’ random lengths but can be cut to size for orders.

Available Steel Grades: 304, 304L and 316L
We will custom saw cut to length and sell less than full lengths in some sizes.
Mill finish and polished products in stock.
Polishing services are available.

O.D.

Thickness(mm)

in

mm

0.7

0.8

0.9

1.0

1.2

1.5

2.0

2.5

3.0

4.0

5.0

1/2" x 1/2"

12.7 x 12.7

X

5/8" x 5/8"

15.9 x 15.9

X

18.0 x 18.0

X

3/4" x 3/4"

19.0 x 19.0

X

20.0 x 20.0

X

7/8" x 7/8"

22.2 x 22.2

X

1" x 1"

25.4 x 25.4

X

30.0 x 30.0

X

1 1/4" x 1 1/4"

31.8 x 31.8

X

1 1/2" x 1 1/2"

38.1 x 38.1

X

40.0 x 40.0

X

50.0 x 50.0

X

2" x 2"

50.8 x 50.8

X

60.0 x 60.0

X

70.0 x 70.0

X

80.0 x 80.0

X

90.0 x 90.0

X

100.0 x 100.0

X

Tolerance:

Item	Side	Thickness	Diagonal	Radii of Corners	Straightness	Length	Flatness
ASTM A554	<31.8mm±0.38mm	±10%	≤0.4mm	≤2.5mmR	≤10mm/ 6M	+50mm-0mm	±0.15mm
	31.8mm~63.5mm±0.51mm
	≥63.5mm±0.76mm

ASTM-Standards:

Iron and Steel Products Steel Piping, Steel Tubing, Fittings

ASTM A1016-04a	Standard Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
A 213 / A 213M-09	Seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes
A 268 / A 268M	Seamless and welded ferritic and martensitic stainless steel tubing for general service
A 269 / A 269M	Seamless and welded austenitic stainless steel tubing for general service
A 312 / A 312M-09	Seamless and welded austenitic stainless steel pipes
A 450 / A 450M-03	Standard Specification for General Requirements for Carbon, Ferritic Alloy, and Austenitic Alloy Steel Tubes
A 511	Seamless stainless steel mechanical tubing
A 789 / A 789M	Seamless and welded ferritic-austenitic stainless steel tubing for general service
A 790 / A 790M-08	Seamless and welded ferritic-austenitic stainless steel pipe
U Bend Tubes	Standards for U bend Stainless Steel Tubes for Heat Exchanger

*Note: Section Two: Nonferrous Metals Nickel, Cobalt, Lead, Tin, Zinc, Cadmium, Precious, Reactive, Refractory Metals and Alloys; Materials for Thermostats, Electrical Heating and Resistance Contacts, and Connectors

ASME-Standards :

ASME Boiler Pressure Code Section II Part A - Ferrous Material Specification

SA 213 / SA 213M	Seamless ferritic and austenitic alloy steel boiler, superheater and heat exchanger tubes
SA 268 / SA 268M	Seamless and welded ferritic and martensitic stainless steel tubing for general service
SA 269 / SA 269M	Seamless and welded austenitic stainless steel tubing for general service
SA 312 / SA 312M	Seamless and welded austenitic stainless steel pipes
SA 511	Seamless stainless steel mechanical tubing
SA 789 / SA 789M	Seamless and welded ferritic-austenitic stainless steel tubing for general service
SA 790 / SA 790M	Seamless and welded ferritic-austenitic stainless steel pipe

UNI-Standards :

Stainless and heat resisting steels

UNI 6904

Seamless tubes of special alloyed corrosion and heat resisting stainless tubes

GOST-Standards :

Stainless steels

GOST 9940	Seamless stainless steel tubes, hot finished
GOST 9941	Seamless stainless steel tubes, cold and hot finished
TU 14-3-460	Seamless Steel Pipes for Steam Boilers and Pipelines

European-Standards :

Stainless steels

EN 10216-5*	Seamless steel tubes for pressure purposes
EN ISO 1127	Seamless stainless steel tubes (Dimensions and weights)

*Note: This European standard is replacing old national standards for pressure purpose (DIN 17458 DIN 17459 NFA 49117 NFA 49217 NFA 49218 BS 3605 BS 3605-1 etc…
All European standards have their own national designation (example NF EN 10216-5 DIN EN 10216-5 BS EN XXXXX UNI EN XXXXX ..)

DIN-Standards:

Stainless steels

DIN 17456	General purpose seamless circular stainless steel tubes
DIN 17458	Seamless circular Austenitic stainless steel tube subject to special requirement
DIN 17459	Seamless Circular High Temperature Austenitic Stainless Steel Tube Subject To Special Requirement

JIS-Standards:

Stainless steels

JIS G 3459	Stainless steel pipes
JIS G 3463	Stainless steel boiler and heat exchanger tubes

Stainless Steel Rectangular Tubes (Polished / Matt Finish)

Specifications: CNS 5802, JIS G3446 and ASTM A554

O.D.(in)	Thickness(mm)
O.D.(in)	0.7	0.8	0.9	1.0	1.2	1.5	2.0	2.5	3.0	4.0	5.0
10X20	X	X	X	X	X	X	X
10X25	X	X	X	X	X	X	X
10X30	X	X	X	X	X	X	X
13X26	X	X	X	X	X	X	X
15X30	X	X	X	X	X	X	X
20X40	X	X	X	X	X	X	X
25X50			X	X	X	X	X	X	X
30X60			X	X	X	X	X	X	X
40X80					X	X	X	X	X
45X75					X	X	X	X	X
45X95						X	X	X	X	X
50X100						X	X	X	X	X
60X120							X	X	X	X	X

Tolerance:

Item	Outside diameter	Thickness	Digonal	Edge Radius	Radii of Corners	Straightness	Length	Flatness
ASTM A554	<31.8mm±0.38mm		±10%	≤0.4mm	≤2.5mmR	≤10mm/ 6M	+50mm-0mm	±0.15mm
	31.8mm~63.5mm±0.51mm
	≥63.5mm±0.76mm

Related seamless steel products

Oval pipe, flat oval pipe and elliptic pipe

Square hollow section

Rectangular Hollow Section