ASTM A519

SEAMLESS MECHANICAL STEEL TUBING ASTM A519

Seamless mechanical tubing is manufactured from carbon and alloy steels for structural or other mechanical purposes involving machining or heat treating, where close tolerances, smooth finish, or definite physical properties are important factors.

Anson alloys available upon request. Reduce the weight of your product while increasing your physical requirements.

SPECIAL NOTE: Tolerances are applicable only to two dimensions (length excepted). Thus, if OD and wall are specified, the theoretical ID may not conform to published tolerances except that the mean or average wall (taking into account the permissible OD and ID tolerances) will not vary more than indicated under “DIAMETER AND WALL TOLERANCES.”

 

EXAMPLE: If a cold drawn tube is specified 1-1/2 inch OD x 1-1/4 inch ID, one might expect the theoretical wall of 1/8 inch to be held to a variation of plus or minus 7-1/2 percent or within the limits of 0.116/0.134 inch.

However, for a nominal OD of 1.500 inch, the OD may vary between 1.500 inch and 1.505 inch, and the ID may vary between 1.245 inch and 1.250 inch, which may result in an average or mean wall of 0.130 inch instead of 1/8 inch. Consequently, the wall may vary plus or minus 7-1/2 percent from the mean of 0.130 inch, or within limits of 0.120/0.140 inch. If, however, the average wall were 1/8 inch (0.125) reflecting 1.500 inch OD and 1.250 inch ID, the wall limits would be plus or minus 7-1/2 percent of 1/8 or 0.116/0.134 inch. Hence, any order of tubes might vary in the entire lot as low as 0.116 inch on some and as high as 0.134 inch on others.

COMPARATIVE DATA SEAMLESS CARBON STEELS
Condition	Nominal Yield Strength psi	Nominal Ultimate Strength psi	Nominal Elongation in 2%	Equivalent Rockwell Hardness	Equivalent Brinell Hardness
GRADE 1018 c .15/.20 Mn .60/90 P .40 max S .050 max
Hot-Rolled	35,000	60,000	30	B-68	116
Normalized	38,000	58,000	35	B-66	114
Soft-Annealed	33,000	50,000	40	B-57	97
As-Drawn	70,000	85,000	10	B-87	170
CD-Stress Relief Annealed	60,000	80,000	15	B-85	163

GRADE 1020 C. 18/.23 Mn .30/.60 P .040 max S .050 max
Hot-Rolled	38,000	60,000	30	B-68	116
Normalized	40,000	58,000	35	B-66	114
Soft-Annealed	33,000	53,000	40	B-62	105
As-Drawn	65,000	80,000	10	B-85	163
CD-Stress Relief Annealed	60,000	75,000	15	B-81	149

GRADE 1026 C .22/.28 Mn .60/.90 P .030 max S .050 max
Hot-Rolled	47,000	70,000	28	B-77	137
Normalized	50,000	67,000	33	B-74	131
Soft-Annealed	36,000	60,000	35	B-68	116
As-Drawn	72,000	87,000	10	B-89	179
CD-Stress Relief Annealed	65,000	82,000	15	B-86	167

OUTSIDE AND INSIDE DIAMETER TOLERANCES FOR
ROUND COLD-WORKED SEAMLESS TUBING PER ASTM A519

Outside Diameter Size Range in	Thermal Treatment after Final Cold Work Producing Size
	Wall Thickness as  Percent  of OD	None, or not exceeding 1100°F. Nominal Temperature				Heated Above 1100°F. Nominal Temperature Without Accelerated Cooling
		OD, in		ID, in		OD, in		ID, in
		Over	Under	Over	Under	Over	Under	Over	Under
Up to 0.499	All	0.004	0.000	—	—	0.005	0.002	—	—
0.500-1.699	All	0.005	0.000	0.000	0.005	0.007	0.002	0.002	0.007
1.700-2.099	All	0.006	0.000	0.000	0.006	0.006	0.005	0.005	0.006
2.100-2.499	All	0.007	0.000	0.000	0.007	0.008	0.005	0.005	0.008
2.500-2.899	All	0.008	0.000	0.000	0.008	0.009	0.005	0.005	0.009
2.900-3.299	All	0.009	0.000	0.000	0.009	0.011	0.005	0.005	0.011
3.300-3.699	All	0.010	0.000	0.000	0.010	0.013	0.005	0.005	0.013
3.700-4.099	All	0.011	0.000	0.000	0.011	0.013	0.007	0.010	0.010
4.100-4.499	All	0.012	0.000	0.000	0.012	0.014	0.007	0.011	0.011
4.500-4.899	All	0.013	0.000	0.000	0.013	0.016	0.007	0.012	0.012
4.900-5.299	All	0.014	0.000	0.000	0.014	0.018	0.007	0.013	0.013
5.300-5.549	All	0.015	0.000	0.000	0.015	0.020	0.007	0.014	0.014
5.500-5.999	Under 6 6 to 7-1/2 over 7-1/2	0.010	0.010	0.010	0.010	0.018	0.018	0.018	0.018
		0.009	0.009	0.009	0.009	0.016	0.016	0.016	0.016
		0.018	0.000	0.009	0.009	0.017	0.015	0.016	0.016
6.000-6.499	Under 6 6 to 7-1/2 over 7-1/2	0.013	0.013	0.013	0.013	0.023	0.023	0.023	0.023
		0.010	0.010	0.010	0.010	0.018	0.018	0.018	0.018
		0.020	0.000	0.010	0.010	0.020	0.015	0.018	0.018
6.500-6.999	Under 6 6 to 7-1/2 over 7-1/2	0.015	0.015	0.015	0.015	0.027	0.027	0.027	0.027
		0.012	0.012	0.012	0.012	0.021	0.021	0.021	0.021
		0.023	0.000	0.012	0.012	0.026	0.015	0.021	0.021
7.000-7.499	Under 6 6 to 7-1/2 over 7-1/2	0.018	0.018	0.018	0.018	0.032	0.032	0.032	0.032
		0.013	0.013	0.013	0.013	0.023	0.023	0.023	0.023
		0.026	0.000	0.013	0.013	0.031	0.015	0.023	0.023
7.500-7.999	Under 6 6 to 7-1/2 over 7-1/2	0.020	0.020	0.020	0.020	0.035	0.035	0.035	0.035
		0.015	0.015	0.015	0.015	0.026	0.026	0.026	0.026
		0.029	0.000	0.015	0.015	0.036	0.015	0.026	0.026
8.000-8.499	Under 6 6 to 7-1/2 over 7 1¼2	0.023	0.023	0.023	0.023	0.041	0.041	0.041	0.041
		0.016	0.016	0.016	0.016	0.028	0.028	0.028	0.028
		0.031	0.000	0.015	0.016	0.033	0.022	0.028	0.028
8.500-8.999	Under 6 6 to 7-1/2 over 7-1/2	0.025	0.025	0.025	0.025	0.044	0.044	0.044	0.044
		0.017	0.017	0.017	0.017	0.030	0.030	0.030	0.030
		0.034	0.0000	0.015	0.019	0.038	0.022	0.030	0.030
9.000-9.499	Under 6 6 to 7-1/2 over 7-1/2	0.028	0.028	0.028	0.028	0.045	0.045	0.045	0.045
		0.019	0.019	0.019	0.019	0.033	0.033	0.033	0.033
		0.037	0.000	0.015	0.022	0.043	0.022	0.033	0.033
9.500-9.999	Under 6 6 to 7-1/2 over 7-1/2	0.030	0.030	0.030	0.030	0.045	0.045	0.053	0.053
		0.020	0.020	0.020	0.020	0.035	0.035	0.035	0.035
		0.040	0.000	0.015	0.025	0.048	0.022	0.035	0.035
10.000-10.999	Under 6 6 to 7-1/2 over 7-1/2	0.034	0.034	0.034	0.034	0.045	0.045	0.060	0.060
		0.022	0.022	0.022	0.022	0.039	0.039	0.039	0.039
		0.044	0.000	0.015	0.029	0.055	0.022	0.039	0.039
11.000-12.000	Under 6 6 to 7- 1/2 over 7-1/2	0.035	0.035	0.035	0.035	0.050	0.050	0.065	0.065
		0.025	0.025	0.025	0.025	0.045	0.045	0.045	0.045
		0.045	0.0000	0.015	0.035	0.060	0.022	0.045	0.045

WALL THICKNESS TOLERANCES FOR ROUNDa,b,c COLD-WORKED SEAMLESS TUBING PER ASTM A519
Cold Drawn Maximum % Over  and Under Nominal		Wall Thickness % of OD
ID Up To 1.499 Inches	ID 1.500 Inches and Over
10	7.5	25 and Under
12.5	10	Over 2

*	ID Tolerances apply to dimensions 0.625 inch and over when ID is at least half the OD
a	Many tubes with inside diameter less than 50% of outside diameter or with wall thickness more than 25% of outside diameter, or with wall thickness over 11¼4 in., or weighing more than 90 lb/ft, are difficult to draw over a mandrel. Therefore, the inside diameter can vary over or under by an amount equal to 10% of the wall thickness. See also Footnote B.
b	For those tubes with inside diameter less than 1/2 in. (or less than 5/8 in. when the wall thickness is more than 20% of the outside diameter), which are not commonly drawn over a mandrel. Footnote A is not applicable. Therefore, for those tubes, the inside diameter is goverened by the outside diameter tolerance shown in thiis table and the wall thicnkess tolerances shown in Table 9.
c	Tubing having a wall thickness less than 3% of the outside diameter cannot be straightened properly without a certain amount of distortion. Consequently such tubes, while having an average outside diameter and inside diameter within the tolerances shown in this table, require an ovality tolerance of 1/2% over and under nominal outside diameter, this being in addition to the tolerances indicated in this table.

OVALITY OF NORMAL SIZE WILL BE WITHIN  OD TOLERANCES

For seamless tubes with inside diameter less than 1/2 inch (or less than 5/8 inch when the wall thickness is more than 20 percent of the outside diameter), which cannot be successfully drawn over a mandrel, the wall thickness may vary 15 percent over or under that specified, and the inside diameter will be governed by the outside diameter and wall thickness variations.

NOTE — Tubing having a wall thickness less than 3 percent of the outside diameter cannot be straightened properly without a certain amount of distortion. Consequently, such tubes, while having an average outside diameter and inside diameter within the tolerances shown in the preceding table, require an ovality tolerance of 1/2 percent over and under nominal outside diameter, this being in addition to the tolerances indicated in the preceding table.

VARIATIONS FROM STRAIGHTNESS

Size Limits	Maximum Curvature In Any 3 Feet	Maximum Curvature In Total Lengths	Maximum Curvature  For Lengths  Under 3 Feet
OD 5″ and smaller, wall  thickness, over 3% of OD  but not over 0.5″	0.030	0.30 x (Number of feet/of length 3)	Ratio of 0.010″ per foot
OD over 5″ to 8″ incl. Wall thickness, over 4% of OD  but not over 0.75″	0.045	0.045 (Number of feet/of length 3)	Ratio of 0.015″ per foot
OD over 8″ to 12″ incl. Wall thickness, over 4% of OD  but not over 1″	0.060	0.060″ (Number of feet/of length 3)	Ratio of 0.010″ per foot

Camber, or out-of-straightness, tolerances generally do not exceed the amounts shown for lengths of 22 feet and under. The camber is measured for any three feet of length with a three foot straightedge and the use of a feeler gage. The total camber — maximum curvature in the total length of the tube — is determined by rolling the tube on a surface plate and measuring the concavity with a feeler gage.

When the machined length of a tube extends more than three inches from the chuck or other holding mechanism, the possibility that the tube may be cambered must be taken into consideration. Allowance for camber must be made for any machined length proportional to the tolerances shown.

Tubes with lighter or heavier walls than shown, and soft annealed or hardened tubes, present more than normal straightening difficulties, and the camber tolerance requirements of such tubes usually are mutually agreed upon by the purchaser and the producer.

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