ASTM A511 Standard Specification for Seamless Stainless Steel Mechanical Tubing and Hollow Bar
ASTM A511 304 304L 309S 310S 316 316L 317 321 347 Stainless Steel Mechanical Tubing
ASTM A511 304 304L 309S 310S 316 316L 317 321 347 Stainless Steel Hollow bar
This covers seamless stainless steel tubing for use in mechanical applications where corrosion-resistant or high-temperature strength is needed. The steel cast in ingots or may be strand cast. When steel of different grades is sequentially strand cast, identification of the resultant transition material is required. The tubes shall be made by a seamless process and by either cold working or hot working as specified. Seamless stainless steel tubing is a tubular product made without a welded seam.
It is usually manufactured by hot working steel and then cold finishing the hot-worked tubing to produce the desired shape, dimensions and properties All austenitic tubes shall be furnished in the annealed condition. An analysis of each heat of steel shall be made to determine the percentages of the elements specified. If secondary melting processes are employed, the heat analysis shall be obtained from one remelted ingot or the product of one remelted ingot of each primary melt.
This specification covers seamless stainless steel tube for use in mechanical applications where corrosion-resistant or high-temperature strength is needed. This specification covers seamless cold-finished mechanical tubing and seamless hot-finished mechanical tubing in sizes up to 12¾ in. [325 mm] in outside nominal diameter with wall thicknesses as required.
Tubes shall be furnished in one of the following shapes, as specified by the purchaser: round, square, rectangular, or special. Optional supplementary requirements are provided and when desired, shall be stated in the order.
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.
2. Referenced Documents
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel, Austenitic Alloy Steel, and Stainless Steel Tubes
ASTM A370 Test Methods and Definitions for Mechanical Testing of Steel Products
E59 Practice for Sampling Steel and Iron for Determination of Chemical Composition
MIL-STD-129 Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products Preparation for Shipment and Storage
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
Index Terms
austenitic stainless steel; mechanical tubing; seamless steel tube; stainless steel tube; steel tube; Corrosive service applications--tube (steel); High-temperature service applications--steel tube; Mechanical tubing--specifications; Seamless steel tube--specifications; Stainless steel pipe--specifications; ICS Number Code 23.040.10; 23.040.40; ICS Number Code 23.040.10; 23.040.40
 ASTM 511 Standard Specification for Seamless Stainless Steel Mechanical Tubing and Hollow Bar
3. ASTM A511 Chemical Composition:
Grade
|
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 %.
4. Permissible 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 |
5. 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).
6. 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.
7. 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. |
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
Henghao Special Alloy is well-known as one of the leading ASTM A511 seamless stainless steel mechanical tubing manufacturer and supplier in China for its reliable quality products and excellent service.
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