1. Scope: 1.1 This specification covers seamless stainless steel tube for use in mechanical applications where corrosion-resistant or high-temperature strength is needed. The grades covered are listed in Table 1 and Table 2. 1.2 This specification covers seamless cold-finished mechanical tubing...
Online Inquiry1. Scope:
1.1 This specification covers seamless stainless steel tube for use in
mechanical applications where corrosion-resistant or high-temperature strength
is needed. The grades covered are listed in Table 1 and Table 2.
1.2 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 (for round tubing) with wall thicknesses as
required.
1.3 Tubes shall be furnished in one of the following shapes, as specified by
the purchaser: round, square, rectangular, or special.
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.
2. Referenced Documents
A1016/A1016M Specification for General Requirements for Ferritic Alloy Steel,
Austenitic Alloy Steel, and Stainless Steel Tubes
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)
3. Chemical 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 %.
4. Permissible Variations in Outside
Diameter, Ovality, Wall Thickness, and Cut-Length Variations
(Cold-Finished Round Tubing)A
|
Outside |
Outside
Diameter, Tolerance,B |
Ovality,B Double |
Wall Thickness |
Permissible
Variations |
||
|
|
|
|
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 |
Ratio of Wall |
Outside Diameter and Wall Thickness Tolerances |
Permissible
Variations |
||||||||||
|
Wall Thickness, % |
|||||||||||||
|
Outside |
0.109 in. |
0.109 to |
Over 0.172 to |
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 |
Max Curvature in Total Lengths, in. |
Max Curvature
for |
|
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 |
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
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