ASTM A511 / A511M – 16: Standard Specification for Seamless Stainless Steel Mechanical Tubing and Hollow Bar

ASTM A511 / A511M – 16

Standard Specification for Seamless Stainless Steel Mechanical Tubing and Hollow Bar

1. Scope
1.1 This specification covers seamless stainless tubing for use in mechanical applications or as hollow bar for use in the production of hollow components such as, but not limited to nozzles, reducers, and couplings by machining where corrosion-resistant or high-temperature strength is needed. The grades covered are listed in Table 1, Table 2, and Table 3.
(A) For small diameter or thin wall tubing or both, where many drawing passes are required, a maximum of 0.040 % carbon is necessary in grades MT-304L and MT-316L. Small outside diameter tubes are defined as those under a 0.500 in. [12.7 mm] outside diameter and light-wall tubes as those under a 0.049 in. [1.2 mm] average wall thickness (0.044 in. [1.1 mm] min wall thickness).
(B) Iron shall be determined arithmetically by difference of 100 minus the sum of the other specified elements.
(C) The range of (Al + Ti) shall be within 0.85–1.20 %.
(D) The terms Niobium (Nb) and Columbium (Cb) are alternate names for the same element.
(A) MT446-2 is a lower carbon version of MT446-1, that has a lower tensile strength but improved ductility and toughness.
(B) Carbon plus nitrogen = 0.025 max %.
(A) Maximum, unless a range or minimum is indicated. Where ellipses (…) appear in this table, there is no requirement and analysis for the element need not be determined or reported.
(B) % Cr + 3.3 X % Mo + 16X % N ≥ 40.
1.2 This specification covers seamless cold-finished mechanical tubing and hollow bar and seamless hot-finished mechanical tubing and hollow bar in sizes up to 123/4 in. [325 mm] in outside nominal diameter (for round tubing) with wall thicknesses or inside diameters as required.
1.3 Tubes for mechanical applications shall be furnished in one of the following shapes, as specified by the purchaser: round, square, rectangular, or special. Tubes to be used as hollow bar shall be furnished in round shape.
1.4 Optional supplementary requirements are provided and when desired, shall be stated in the order.
1.5 The values stated in inch-pound units are to be regarded as the standard. Within the text, the SI units are shown in square brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independently of the other.

2Chemical Requirements of Austenitic Stainless Steels:

Grade

Composition, %

Carbon

Mn

P

S

Si, max

Ni

Cr

Mo

Ti

Columbium plus Tantalum

Se

 max

max

max

MT 302

0.08 to 0.20

2

0.04

0.03

1

8.0–10.0

17.0–19.0

MT 303

0.15 max

2

0.2

0.15 min

1

8.0–10.0

17.0–19.0

MT 303Se

0.15 max

2

0.04

0.04

1

8.0–11.0

17.0–19.0

0.12–0.2

MT 304

0.08 max

2

0.04

0.03

1

8.0–11.0

18.0–20.0

MT 304L

0.035 maxA

2

0.04

0.03

1

8.0–13.0

18.0–20.0

MT 305

0.12

2

0.04

0.03

1

10.0–13.0

17.0–19.0

MT 309S

0.08 max

2

0.04

0.03

1

12.0–15.0

22.0–24.0

MT 310S

0.08 max

2

0.04

0.03

1

19.0–22.0

24.0–26.0

MT 316

0.08 max

2

0.04

0.03

1

11.0–14.0

16.0–18.0

2.0–3.0

MT 316L

0.035 maxA

2

0.04

0.03

1

10.0–15.0

16.0–18.0

2.0–3.0

MT 317

0.08 max

2

0.04

0.03

1

11.0–14.0

18.0–20.0

3.0–4.0

MT 321

0.08 max

2

0.04

0.03

1

9.0–13.0

17.0–20.0

B

MT 347

0.08 max

2

0.04

0.03

1

9.0–13.0

17.0–20.0

C

A For small diameter or thin wall tubing or both, where many drawing passes are required, a maximum of 0.040 % carbon is necessary in grades MT-304L and MT-316L. Small outside diameter tubes are defined as those under a 0.500 in. [12.7 mm] outside diameter and light-wall tubes as those under a 0.049 in. [1.2 mm] average wall thickness (0.044 in. [1.1 mm] min wall thickness). 
B The titanium content shall be not less than five times the carbon content and not more than 0.60 %. 
C The columbium plus tantalum content shall be not less than ten times the carbon content and not more than 1.00 %.


3Permissible Variations in Outside Diameter, Ovality, Wall Thickness, and Cut-Length Variations
(Cold-Finished Round Tubing)A

Outside
Diameter,in.

Outside Diameter, Tolerance,B
in. Over and Under

Ovality,B Double
Outside Diameter
Tolerance when wall is:

Wall Thickness
in %C,D

Permissible Variations
in Cut Length, in.E

Over

Under

Over

Under

Under 1⁄2

0.005

less than 0.015 in.

15

15

1⁄8

0

1⁄2 to 11⁄2 , excl

0.005

less than 0.065 in.

10

10

1⁄8

0

11⁄2 to 31⁄2 , excl

0.01

less than 0.095 in.

10

10

3⁄16

0

31⁄2 to 51⁄2 , excl

0.015

less than 0.150 in.

10

10

3⁄16

0

51⁄2 to 8, exc

0.03

less than 0.240 in.

10

10

3⁄16

0

8 to 85⁄8 , excl

0.045

less than 0.300 in.

10

10

3⁄16

0

85⁄8 to 123⁄4 , incl

0.062

less than 0.350 in.

10

10

3⁄16

0


4. Permissible Variations in Outside Diameter, Wall Thickness, and Cut-Length Variations
(Hot-Finished Round Tubing)

Specified Size, Outside
Diameter, in.

Ratio of Wall
Thickness to
Outside Diameter

Outside Diameter and Wall Thickness Tolerances

Permissible Variations
 in Cut Length, in.A

Wall Thickness, %

Outside
Diameter, in.

0.109 in.
and under

0.109 to
0.172 in., incl

Over 0.172 to
0.203 in., incl

Over 0.203 in.

over

under

over

under

over

under

over

under

over

under

Under 3

all wall thicknesses

0.023

0.023

16.5

15

15

15

14

14

12.5

12.5

3⁄16

0

3 to 51⁄2 , excl

all wall thicknesses

0.031

0.031

16.5

15

15

15

14

14

12.5

12.5

3⁄16

0

51⁄2 to 8, excl

all wall thicknesses

0.047

0.047

14

14

12.5

12.5

3⁄16

0

8 to 103⁄4 , excl

5 % and over

0.047

0.047

12.5

12.5

3⁄16

0

103⁄4 to 123⁄4 , incl

under 5 %

0.063

0.063

12.5

12.5

3⁄16

0

A These tolerances apply to cut lengths up to and including 24 ft (7.3 m). For lengths over 24 ft, an additional over tolerance of 1⁄8 in. (3.1 mm) for each 10 ft (3 m) or faction thereof shall be permissible, up to a maximum tolerance of 1⁄2 in. (12.7 mm).


5. Straightness Tolerances (Cold-/Finished or Hot-/Finished Round Tubing)A

Size Limits

Max Curvature
     in any 3 ft, in.

Max Curvature in Total Lengths, in.

Max Curvature for
     Lengths under 3 ft

OD 5 in. and smaller. Wall thickness, over 3 % of OD but not over 0.5 in.

0.03

0.030 3 [(Number of feet of length)/3]

Ratio of 0.010 in./ft

OD over 5 in. to 8 in., incl. Wall thickness, over 4 % of OD but not over 0.75in.

0.045

0.045 3 [(Number of feet of length)/3]

Ratio of 0.015 in./ft

OD over 8 in. to 123⁄4 , incl. Wall thickness, over 4 % of OD but not over 1 in.

0.06

0.060 3 [(Number of feet of length)/3]

Ratio of 0.020 in./ft

A The usual procedure for measuring straightness is by means of a 3-ft (0.9 m) straight edge and feeler gage. If determined by the dial indicator method, the values obtained will be approximately twice those determined by the straightedge feeler gage method.


6. Permissible Variations in Outside Dimensions for Square and Rectangular Seamless Mechanical TubingAB

Largest Outside Dimension Across
Flats, in.

Tolerances, Outside Dimension Seamless Mechanical Tubing Plus and Minus, in.

 

For Wall Thickness, Given, in.

Tolerance for Outside Dimension (Including Convexity or Concavity) Plus and Minus, in.

To 3⁄4 , incl

0.065 and lighter

0.015

To 3⁄4 , incl

over 0.065

0.01

Over 3⁄4 to 11⁄4 , incl

all thicknesses

0.015

Over 11⁄4 to 21⁄2 , incl

all thicknesses

0.02

Over 21⁄2 to 31⁄2 , incl

0.065 and lighter

0.03

Over 21⁄2 to 31⁄2 , incl

over 0.065

0.025

Over 31⁄2 to 51⁄2 , incl

all thicknesses

0.03

Over 51⁄2 to 71⁄2 , incl

all thicknesses

1%

A The wall thickness tolerance is plus and minus 10 % of nominal wall thickness.

B The straightness tolerance is 0.075 in. 3 ft. using a 3-ft straight edge and feeler gage

Related News

  • * 暂无相关文章
العربية简体中文NederlandsEnglishFrançaisDeutschItaliano한국어РусскийEspañolไทยTürkçe