ASTM A513 - T5 Drawn Over Mandrel ST52.3

PRODUCT DATA — DRAWN OVER MANDREL TUBING ASTM A513 TYPES 5 AND 6
DRAWN OVER MANDREL vs. COLD DRAWN SEAMLESS TUBING Advantages of DOM

1. More uniform wall thickness

5. Denser ID surface

2. Better surface finish

6. Closer tolerance

3. Less stock removal

7. Comparable or lower cost

4. No spiral on ID

1. WALL VARIATION

DRAWN OVER MANDREL has very little wall variation and no spiraling eccentricity. The tube is formed and electric resistance welded from flat steel which has very little gauge variation. Any wall variation that may exist in the flat steel runs in the same plane throughout the length of the tube, leaving the bore straight and true.

COLD DRAWN SEAMLESS has an inherent characteristic of eccentricity. In the piercing process a solid billet is heated and forced in a rotary motion over a piercing point to form the seamless tube hollow for subsequent cold drawing. It is impossible to keep the piercing point always in the exact center of the tube round during the piercing operation. As a result, wall variation is induced into the tube. Moreover, since the shell is turning as it is being formed, spiraling eccentricity is created. Additional hot and cold finishing operations greatly refine the dimensional accuracy of the seamless tube, but the eccentricity is never fully eliminated.

2. SURFACE FINISH

Better surface finish can generally be expected on DOM tubing because the surface of the welded tube, prior to cold drawing, is usually better than seamless at the same stage. For many applications, the surface of DOM, coupled with closer concentricity, may altogether eliminate any additional finishing operations.

3. STOCK REMOVAL

Less stock removal is required on DOM due to the improved surface finish and elimination of spiraling eccentricity and wall variation. As a result, there is less machine time and tool wear in manufacturing the finished product.

4. ID SURFACE DENSITY

The ID surface of DOM tubing has been worked from the ingot stage down to a thin flat strip and then welded to a round tube. Seamless, produced from a solid bar, contains an ID surface that was once the core of a solid bar. Consequently, DOM has a more dense ID surface than seamless tubing.

5. CLOSER TOLERANCE

The OD and ID tolerance on DOM and seamless are generally the same. However, the wall tolerance differs greatly. On light wall DOM, the wall could vary only plus or minus 0.003 inch, compared to seamless at plus or minus 6 to 7-1/2 percent. Heavier wall DOM could vary up to plus or minus 0.009 inch compared to seamless at plus or minus 7-1/2 percent.

DRAWN OVER MANDREL

ST 52.3

	OD	WALL
Sizes:	1.250″ – 10.250″	.120″ – .660″

Guaranteed impact values at -20 C (-4 F) when specified.

Size	Avg. of 3		Min Value
(MM x MM)	Ft. #’s	Joules	Ft. #’s	Joules
10 x 10	20	27	15	20
10 x 7.5	16	22	12	16
10 x 6.6	14.8	20	11	15
10 x 5.0	12	16	9	12

CHEMISTRY

MECHANICAL PROPERTIES

Carbon

.12/.17

Yield Strength

75,000

Manganese

1.20/1.60

Tensile Strength

85,000

Phosphorus

.025 Max

Elongation in 2”

18%

Sulfur

.010 Max

Hardness

85 RB Min

Silicon

.15/.30

DIAMETER TOLERANCES FOR ROUND DOM TUBING

Note — Measurements for diameter are to be taken at least 2 in. from the ends of the tubes.

OD Size Range	Wall Percent of OD	OD, Inches		ID, Inches
OD Size Range	Wall Percent of OD	Over	Under	Over	Under
Up to 0.499	All	0.004	0.000	—	—
0.500-1.699	All	0.005	0.000	0.000	0.005
1.700-2.099	All	0.006	0.000	0.000	0.006
2.100-2.499	All	0.007	0.000	0.000	0.007
2.500-2.899	All	0.008	0.000	0.000	0.008
2.900-3.299	All	0.009	0.000	0.000	0.009
3.300-3.699	All	0.010	0.000	0.000	0.010
3.700-4.099	All	0.011	0.000	0.000	0.011
4.100-4.499	All	0.012	0.000	0.000	0.012
4.500-4.899	All	0.013	0.000	0.000	0.013
4.900-5.299	All	0.014	0.000	0.000	0.014
5.300-5.549	All	0.015	0.000	0.000	0.015
5.500-5.999	Under 6 6 and Over	0.010	0.010	0.010	0.010
5.500-5.999	Under 6 6 and Over	0.009	0.009	0.009	0.009
6.000-6.499	Under 6 6 and Over	0.013	0.013	0.013	0.013
6.000-6.499	Under 6 6 and Over	0.010	0.010	0.010	0.010
6.500-6.999	Under 6 6 and Over	0.015	0.015	0.015	0.015
6.500-6.999	Under 6 6 and Over	0.012	0.012	0.012	0.012
7.000-7.499	Under 6 6 and Over	0.018	0.018	0.018	0.018
7.000-7.499	Under 6 6 and Over	0.013	0.013	0.013	0.013
7.500-7.999	Under 6 6 and Over	0.020	0.020	0.020	0.020
7.500-7.999	Under 6 6 and Over	0.015	0.015	0.015	0.015
8.000-8.499	Under 6 6 and Over	0.023	0.023	0.023	0.023
8.000-8.499	Under 6 6 and Over	0.016	0.016	0.016	0.016
8.500-8.999	Under 6 6 and Over	0.025	0.025	0.025	0.025
8.500-8.999	Under 6 6 and Over	0.017	0.017	0.017	0.017
9.000-9.499	Under 6 6 and Over	0.028	0.028	0.028	0.028
9.000-9.499	Under 6 6 and Over	0.019	0.019	0.019	0.019
9.500-9.999	Under 6 6 and Over	0.030	0.030	0.030	0.030
9.500-9.999	Under 6 6 and Over	0.020	0.020	0.020	0.020
10.000-10.999	All	0.034	0.034	0.034	0.034
11.000-11.999	All	0.035	0.035	0.035	0.035
12.000-12.999	All	0.036	0.036	0.036	0.036
13.000-13.999	All	0.037	0.037	0.037	0.037
14.000-14.999	All	0.038	0.038	0.038	0.038

WALL THICKNESS TOLERANCES FOR ROUND DOM TUBING

Wall Thickness		Outside Diameter, In.^a
Wall Thickness		3/8 to 7/8 incl.		Over 7/8 to 1-7/8 incl.		Over 1-7/8 to 3-3/4 incl.		Over 3-3/4 to 15 incl.
In.^a	Bwg^b	Wall Thickness Tolerances, in.,^a ±
In.^a	Bwg^b	+	–	+	–	+	–	+	–
0.035	20	0.002	0.002	0.002	0.002	0.002	0.002	…	…
0.049	18	0.002	0.002	0.002	0.003	0.002	0.003	…	…
0.065	16	0.002	0.002	0.002	0.003	0.002	0.003	0.004	0.004
0.083	14	0.002	0.002	0.002	0.003	0.003	0.003	0.004	0.005
0.095	13	0.002	0.002	0.002	0.003	0.003	0.003	0.004	0.005
0.109	12	0.002	0.003	0.002	0.004	0.003	0.003	0.005	0.005
0.120	11	0.003	0.003	0.002	0.004	0.003	0.003	0.005	0.005
0.134	10	…	…	0.002	0.004	0.003	0.003	0.005	0.005
0.148	9	…	…	0.002	0.004	0.003	0.003	0.005	0.005
0.165	8	…	…	0.003	0.004	0.003	0.004	0.005	0.006
0.180	7	…	…	0.004	0.004	0.003	0.005	0.006	0.006
0.203	6	…	…	0.004	0.005	0.004	0.005	0.006	0.007
0.220	5	…	…	0.004	0.006	0.004	0.006	0.007	0.007
0.238	4	…	…	0.005	0.006	0.005	0.006	0.007	0.007
0.259	3	…	…	0.005	0.006	0.005	0.006	0.007	0.007
0.284	2	…	…	0.005	0.006	0.005	0.006	0.007	0.007
0.300	1	…	…	0.006	0.006	0.006	0.006	0.008	0.008
0.320		…	…	0.007	0.007	0.007	0.007	0.008	0.008
0.344		…	…	0.008	0.008	0.008	0.008	0.009	0.009
0.375		…	…	…	…	0.009	0.009	0.009	0.009
0.400		…	…	…	…	0.010	0.010	0.010	0.010
0.438		…	…	…	…	0.011	0.011	0.011	0.011
0.460		…	…	…	…	0.012	0.012	0.012	0.012
0.480		…	…	…	…	0.012	0.012	0.012	0.012
0.531		…	…	…	…	0.013	0.013	0.013	0.013
0.563		…	…	…	…	0.013	0.013	0.013	0.013
0.580		…	…	…	…	0.014	0.014	0.014	0.014
0.600		…	…	…	…	0.015	0.015	0.015	0.015
0.625		…	…	…	…	0.016	0.016	0.016	0.016
0.650		…	…	…	…	0.017	0.017	0.017	0.017

^a1 in = 25.4mm.
^bBirmingham Wire Gauge.

ADDITIONAL OVALITY TOLERANCE FOR ROUND DOM TUBING

The additional ovality shall be as follows, but the mean outside diameter shall be within the specified tolerance.

Outside Diameter Inches (mm)	Additional Ovality Tolerance Inches (mm)
Up to 2 (50.8), incl.	0.010 (0.25)
Over 2 to 3 (50.8 to 76.2), incl.	0.015 (0.38)
Over 3 to 4 (76.2 to 101.6), incl.	0.020 (0.51)
Over 4 to 5 (101.6 to 127.0), incl.	0.025 (0.64)
Over 5 to 6 (127.0 to 152.4), incl.	0.030 (0.76)
Over 6 to 7 (152.4 to 177.8), incl.	0.035 (0.89)
Over 7 to 8 (177.8 to 203.2), incl.	0.040 (1.02)
Over 8 to 9 (203.2 to 228.6), incl.	0.045 (1.14)
Over 9 to 10 (228.6 to 254.0), incl.	0.050 (1.27)
Over 10 to 11 (254.0 to 279.4), incl.	0.055 (1.40)
Over 11 to 12 (279.4 to 304.8), incl.	0.060 (1.52)
Over 12 to 12.500 (304.8 to 317.5), incl.	0.065 (1.65)

ASTM A513 – T5 Drawn Over Mandrel ST52.3

PRODUCT DATA — DRAWN OVER MANDREL TUBINGASTM A513 TYPES 5 AND 6

DRAWN OVER MANDREL vs. COLD DRAWNSEAMLESS TUBINGAdvantages of DOM

DRAWN OVER MANDREL

ST 52.3

DIAMETER TOLERANCES FOR ROUND DOM TUBING

WALL THICKNESS TOLERANCES FOR ROUND DOM TUBING

ADDITIONAL OVALITY TOLERANCE FOR ROUND DOM TUBING

PRODUCT DATA — DRAWN OVER MANDREL TUBING
ASTM A513 TYPES 5 AND 6

DRAWN OVER MANDREL vs. COLD DRAWN
SEAMLESS TUBING
Advantages of DOM