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Cold Drawn Seamless Steel Tube

Bright annealed cold drawn steel tube with smooth internal and external surface

Tubos sin costura estirados en frío de alta precisión para sistemas hidráulicos

Small diameter cold drawn seamless tubing ASTM A179 for heat exchangers

Product Name: Cold Drawn Seamless Steel Tube, CDS Tube, Precision Steel Tube
Outer Diameter: 6.0 mm - 350 mm
Wall Thickness: 0.5 mm - 30 mm
Length: 1 m - 12 m or custom length
Standards: ASTM A519, EN 10305-1, DIN 2391, JIS G3445
Grades: 1010, 1020, 1045, 4130, 4140, E215, E235, E355, ST35, ST45, ST52, STKM 11A, STKM 12A, STKM 13A
Delivery Condition: BK (+C), BKW (+LC), BKS (+SR), GBK (+A), NBK (+N)
Ends: Square end, plain end, beveled end, threaded end
Applications: Automotive parts, hydraulic and pneumatic cylinders, mechanical machining, precision engineering, heat exchangers and pressure pipelines

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Overview
Specification
Standard
Process
Packing

Cold Drawn Seamless (CDS) Steel Pipe–High Precision & Superior Surface Finish

Our Cold Drawn Seamless (CDS) Steel Pipes are the preferred choice for applications requiring exact dimensional accuracy and a smooth, scale-free surface. Produced by drawing a hot-rolled "mother pipe" through a die at room temperature, the cold-drawing process enhances the steel's mechanical properties, increases hardness, and ensures tighter tolerances than hot-rolled alternatives.

Common Standards and Steel Grades

We manufacture and stock a wide range of CDS tubes to meet specific mechanical and structural requirements:

ASTM A519: Standard specification for seamless carbon and alloy steel mechanical tubing.

Common Grades: 1010, 1020, 1045, 4130, 4140.

ASTM A179 (ASME SA179): Seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes.

DIN 2391 / EN 10305-1: Steel tubes for precision applications.

Grades: ST35, ST45, ST52, E215, E235, E355.

ASTM A106 / A53 Grade B: For high-pressure and high-temperature precision piping.

Dimensions and Technical Specifications

Precision is the hallmark of cold-drawn products. Our facility offers the following sizing capabilities:

Feature	Specification Range
Outer Diameter (OD)	1/8” to 12” (3.18mm – 323.8mm)
Wall Thickness (WT)	0.5mm to 25mm (Ultra-thin to Heavy Wall)
Length	Up to 12m, Fixed Length, or U-Bent for heat exchangers
Tolerances	OD: ±0.05mm to ±0.1mm; WT: ±5% to ±7.5%
Surface Finish	Bright Annealed, Polished, or Oiled (Scale-free)
Delivery Condition	BK (+C), BKW (+LC), BKS (+SR), GBK (+A), NBK (+N)

Core Application Fields

Because of their high precision and strength, CDS pipes are essential in high-performance engineering:

Automotive & Aerospace: Hydraulic cylinders, drive shafts, shock absorbers, and structural frames.

Heat Exchangers & Condensers: High-efficiency thermal transfer tubing for power plants and refineries.

Hydraulic & Pneumatic Systems: Precision fluid power lines where tight seals are mandatory.

Machinery Manufacturing: Bearings, bushings, and high-speed rotating components.

Oil & Gas: Instrumentation tubing and downhole tools requiring exact diameters.

Cold Drawn Seamless (CDS) Mechanical Tubing Range of Sizes

OUTSIDE

DIAMETER

MINIMUM WALL

1.2

1.5

1.7

1.8

2.1

2.4

2.8

3.0

3.4

4.0

4.2

4.8

5.2

5.6

6.4

7.1

8.0

8.3

8.7

9.5

11.1

11.9

12.7

0.049

0.058

0.065

0.072

0.083

0.095

0.109

0.120

0.134

0.156

0.165

0.188

0.203

0.219

0.250

0.281

0.313

0.325

0.344

0.375

0.438

0.469

0.500

12.7

0.500

•

14.3

0.563

•

15.9

0.625

•

19.1

0.750

•

22.2

0.875

•

25.4

1.000

•

28.6

1.125

•

31.8

1.250

•

34.9

1.375

•

38.1

1.500

•

41.3

1.625

•

44.5

1.750

•

47.6

1.875

•

50.8

2.000

•

54.0

2.125

•

57.2

2.250

•

60.3

2.375

•

63.5

2.500

•

66.7

2.625

•

69.9

2.750

•

73.0

2.875

•

76.2

3.000

•

79.4

3.125

•

82.6

3.250

•

85.7

3.375

•

88.9

3.500

•

101.6

4.000

•

114.3

4.500

•

127.0

5.000

•

139.7

5.500

•

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

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	Wall Thickness % of OD
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
1: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.

2: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.

3: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.

Cold Drawn Seamlesstube Production Process

Cold Drawn Seamless (CDS) Mechanical Tubing Range of Sizes

OUTSIDE

DIAMETER

MINIMUM WALL

1.2

1.5

1.7

1.8

2.1

2.4

2.8

3.0

3.4

4.0

4.2

4.8

5.2

5.6

6.4

7.1

8.0

8.3

8.7

9.5

11.1

11.9

12.7

0.049

0.058

0.065

0.072

0.083

0.095

0.109

0.120

0.134

0.156

0.165

0.188

0.203

0.219

0.250

0.281

0.313

0.325

0.344

0.375

0.438

0.469

0.500

12.7

0.500

•

14.3

0.563

•

15.9

0.625

•

19.1

0.750

•

22.2

0.875

•

25.4

1.000

•

28.6

1.125

•

31.8

1.250

•

34.9

1.375

•

38.1

1.500

•

41.3

1.625

•

44.5

1.750

•

47.6

1.875

•

50.8

2.000

•

54.0

2.125

•

57.2

2.250

•

60.3

2.375

•

63.5

2.500

•

66.7

2.625

•

69.9

2.750

•

73.0

2.875

•

76.2

3.000

•

79.4

3.125

•

82.6

3.250

•

85.7

3.375

•

88.9

3.500

•

101.6

4.000

•

114.3

4.500

•

127.0

5.000

•

139.7

5.500

•

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

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	Wall Thickness % of OD
10	7.5	25 and Under
12.5	10	Over 2

Cold Drawn Seamlesstube Production Process

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Tags : cold drawn seamless steel tube , CDS tube , precision steel tube , cold drawn tube , ASTM A519 seamless tube

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