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ASTM A270 TUBES
ASTM A270 (3A/S2)
Standard Specification for 
Seamless and Welded Austenitic and Ferritic/Austenitic 
Stainless Steel Sanitary Tubing (Dairy, Food, Pharmaceutical etc) 

Related Standard: EN 10357 (DIN 11850)/ ISO 2037/ AS 1528.1/ BS 4825-1/ SMS 3008 



Food Tubes-3A ASTM A270

OUTSIDE DIAMETER (MM)
WALL THICKNESS (MM)
NOMINAL OUTSIDEDIAMTER
NOMINAL WALLTHICKNESS

DIEMENSIONAL

STANDARD 

15.88

1.65

5/8'' 0.065''
3A
19.05 1.65 3/4'' 0.065''
3A
25.40 1.65 1'' 0.065''
3A
31.75 1.65 1 1/4'' 0.065''
3A
38.10 1.65 1 1/2'' 0.065''
3A
50.80 1.65 2'' 0.065''
3A
63.50 1.65 2 1/2'' 0.065''
3A
76.20 1.65 3'' 0.065''
3A
88.90 1.65 3 1/2'' 0.065''
3A
101.60 2.11 4'' 0.083'' 3A

Material:

304/304L/316L availble by order. 


ASTM A270 Chemical Requirement

Element TP304 TP304L TP316L

S30400 S30403 S31603




Carbon,max 0.08 0.035 0.035

Manganese,

max

2.00 2.00 2.00

Phosphorus,

max

0.045 0.045 0.045
Sulfur,max 0.030 0.030 0.030
Silicon,max 1.00 1.00 1.00
Nickle 8.0-11.0 8.0-12.0 10.0-14.0
Chromium 18.0-20.0 18.0-20.0 16.0-18.0
Molybdenum --- --- 2.00-3.00


ASTM A270 Permissible Variations in Dimensions


Size Outer Diameter

(mm)

Permissible Variations in

 Outside Diameter(mm)

Permissible Variations in

thickness

Permissible Variations in

cut length

≤25.4

±0.13mm

±10%

+3.2mm/-0mm
38.1-50.8

±0.20

63.5-76.2

±0.25

76.2-101.6

±0.38


Bright  Annealling

Hydrogen bright annealed in line to 1900 ℉(1040℃)minimum and rapidly water quenched. 


Surface Finish Cross Reference Chart


Grit No.
USA Finish #
           Common Name
     [UK] Ra Micron (μm)
  ISO Number
60 #1

Mill Plate

8.3 N9
60

3.2 N8
80 #2 Satin Sheet
1.6 N7
100-120 #3


120 #4 Commercial #4


150 #4 3A Sanitary Finish


150 #4

ANSI #4 Sanitary Finish

0.8 N6
180 #4


200-220 #4S

Biotech Finish



240 #6
0.4 N5
320 #7
0.3
320 #7
0.2 N4
400 #8 Mirror Finish


500 #8

SupermirrorFinish

0.1 N3
500 #8

SupermirrorFinish

0.06 N2

#8

SupermirrorFinish

0.025 N1

Packing:

All tubing is packed using protective 2 tight plastic end caps (Commonly Bluefor 304/304L, Yellow for 316L).

All tubing is printed with size, gauge, alloy, ASTM or ASME (DIN, AS,BS)specifications, heat number, and date of manufacture for full traceability.

All tubing is protected for shipment by bundling, paper or burlapwrapping, or boxing.

Other Packing is available on customer request.

            


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