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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 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 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.
	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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