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ASTM A270 Seamless and Welded Austenitic and Ferritic and Austenitic Stainless Steel Sanitary Tubing


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  • Thickness: 0-10 mm

Specifications

Scope

1.1 This speci?cation covers grades of seamless, welded, and heavily cold worked welded austenitic and ferritic/austenitic stainless steel sanitary tubing intended for use in the dairy and food industry and having special surface ?nishes. Pharmaceutical quality may be requested, as a supplementary requirement.

1.2 This speci?cation covers tubes in sizes up to and including 12 in. (304.8 mm) in outside diameter.

1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

1.4 Optional supplementary requirements are provided, and when one or more of these are desired, each shall be so stated in the order

2. Referenced Documents

2.1 ASTM Standards:2

A 262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels

A 480/A 480M Specification for General Requirements for Flat-Rolled Stainless and Heat-Resisting Steel Plate, Sheet, and Strip

A 923 Test Methods for Detecting Detrimental Intermetallic Phase in Duplex Austenitic/Ferritic Stainless Steels

A 967 Specification for Chemical Passivation Treatments for Stainless Steel Parts

A 1016/A 1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes

E 527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

2.2 ASME Standard:

B46.1 Surface Texture (Surface Roughness, Waviness, and Lay)3

2.3 ASME Boiler and Pressure Vessel Code: Section VIII Pressure Vessels3

2.4 Other Standard: SAE J1086 Practice for Numbering Metals and Alloys(UNS)4

3. Terminology

3.1 Definition:

3.1.1 roughness average, Ra, n-arithmetic average surface roughness normally reported in microinches or microns; a

measurement of surface roughness usually performed by moving a stylus in a straight line along the surface, although other methods may be used.

 

 

TABLE 1 Chemical Requirements

Element

 Grade

 TP 304

 TP 304L

...

TP 316

 TP 316L

...

...

...

...

...

2003

UNS Designation A

S30400

S30403

 S31254

 S31600

S31603

N08926

 N08367

 S31803

 S32205

S32750

S32003

Composition, %

Carbon, max

 

0.080

 0.035B

0.020

0.080

0.035B

0.020

0.030

0.030

0.030

0.030

 0.030 max

Manganese,max

 

2.00

2.00

1.00

2.00

2.00

2.00

2.00

2.00

2.00

1.20

2.00 max

Phosphorus,max

 

0.045

0.045

0.03

0.045

0.045

0.03

0.04

0.03

0.03

0.035

0.03

Sulfur, max

 

0.03

0.03

0.01

0.03

0.03

0.01

0.03

0.02

0.02

0.02

0.020 max

Silicon, max

 

1.00

1.00

0.80

1.00

1.00

0.50

1.00

1.00

1.00

0.80

1.00 max

Nickel

 

 8.0-11.0

8.0-12.0

17.5-18.5

10.0-14.0

10.0-14.0

 24.0-26.0

23.5-25.5

 4.5-6.5

 4.5-6.5

6.0-8.0

3.0-4.0

Chromium

 

 18.0-20.0

 18.0-20.0

19.5-20.5

 16.0-18.0

 16.0-18.0

19.0-21.0

 20.0-22.0

21.0-23.0

22.0-23.0

24.0-26.0

 19.5-22.5

Molybdenum

 

...

...

 6.0-6.5

2.00-3.00

2.00-3.00

6.0-7.0

 6.0-7.0

 2.5-3.5

 3.0-3.5

3.0-5.0

 1.5-2.0

Nitrogen C

 

...

...

 0.18-0.22

...

...

 0.15-0.25

 0.18-0.25

0.08-0.20

0.14-0.20

0.24-0.32

0.14-0.20

Copper

 

...

...

 0.50-1.00

...

...

 0.50-1.5

 0.75 max

...

...

 0.50 max

...

 

A New designation established in accordance with Practice E 527 and SAE J 1086.

B For small diameter or thin walls or both, where many drawing passes are required, a carbon maximum of 0.040 % is necessary in grades TP304L and TP316L. Small outside diameter tubes are defined as those

less than 0.500 in. (12.7 mm) in outside diameter and light wall tubes as those less than 0.049 in. (1.24 mm) in average wall thickness (0.044 in. (1.12 mm) in minimum wall thickness).

C The method of analysis for nitrogen shall be a matter of agreement between the purchaser and manufacturer.

 

TABLE 2 Permissible Variations in Dimensions

 

Size,Outside,Diameter,in. (mm)

Permissible Variations in Outside Diameter, in. (mm)

Permissible Variations in Cut Length, in. (mm)A

 

Over

Under

Over

Under

 

1.000 (25.4) and under

0.005 (0.13

0.005 (0.13

1?8 (3.2)

0

 

Over 1 (25.4) to 2 (50.8)

0.008 (0.20)

0.008 (0.20)

1?8 (3.2)

0

 

Over 2 (50.8) to 3 (76.2)

0.010 (0.25)

0.010 (0.25)

1?8 (3.2)

0

 

Over 3 (76.2) to 4 (101.6)

0.015 (0.38)

0.015 (0.38)

1?8 (3.2)

0

 

Over 4 (101.6) to 5 1?2 (139.7), excl

0.015 (0.38)

0.015 (0.38)

3?16 (4.8)

0

 

5 1?2 (139.7) to 8 (203.2), excl

0.030 (0.76)

0.030 (0.76)

3?16 (4.8)

0

 

8 (203.2) to 12 (304.8)

0.050 (1.27)

0.050 (1.27)

3?16 (4.8)

0

 

A The cut tolerances do not apply to Pharmaceutical Tubing in S2 (see paragraph S2.7).


TABLE S2.1 Tensile and Hardness Requirements

Grade

UNS
Designation

Tensile
Strength min, ksi (MPa)

Yield
Strength min, ksi (MPa)

Elongation
in 2 in.
min, %

Rockwell
Hardness
Number,
max.

TP304

S30400

75 (515)

30 (205)

35

B90

TP304L

S30403

70 (485)

25 (170)

35

B90

TP316

S31600

75 (515)

30 (205)

35

B90

TP316L

S31603

70 (485)

25 (170)

35

B90

 

S31803

90 (620)

65 (450)

25

C30.5

2205

S32205

95 (655)

70 (485)

25

C30.5

2507

S32750

116 (800)

80 (550)

15

C32

2003

S32003

90 (620)

65 (450)

25

C32

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