SSAB Form Tube 420

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General Product Description

Form Tube 420 is high-strength formable precision tube. It has 15% higher elongation values and very narrow tolerances compared with competing products. Available in circular, rectangular, square and special shapes, it comes with different coating and surface options including cold rolled, galvanized, galvannealed and galfan. Customized shapes and other tailoring options are available upon request. Typically uses include light engineering, where formability, uniform quality, different surface options and usability are important.

Dimension Range

SSAB Form Tube 420 is available in circular, square and rectangular shapes.

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Shapes	Dimensions
Circular (mmin)	16 - 88.90.63 - 3.50
Square (mmin)	19x19 - 70x70
Rectangular (mmin)	25x15 - 100x40
Wall thickness (mmin)	0.9 - 3.00.04 - 0.12
Mill length (mm)	6000

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Dimensions

Shapes

Circular (mmin)

Dimensions

16 - 88.90.63 - 3.50

Shapes

Square (mmin)

Dimensions

19x19 - 70x70

Shapes

Rectangular (mmin)

Dimensions

25x15 - 100x40

Shapes

Wall thickness (mmin)

Dimensions

0.9 - 3.00.04 - 0.12

Shapes

Mill length (mm)

Dimensions

6000

Other shapes, sizes and lengths are available upon request.

Circular Dimensions

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Outer diameter (mmin)	0.9 mm (kg/m)	1.0 mm (kg/m)	1.25 mm (kg/m)	1.5 mm (kg/m)	2.0 mm (kg/m)	2.5 mm (kg/m)	3.0 mm (kg/m)
160.63	0.335	0.370	0.455	0.536	0.691 ¹⁾	—	—
180.71	0.380	0.419	0.516	0.610	0.789	—	—
190.75	0.402	0.444	0.547	0.647	0.838	—	—
200.79	0.424	0.469	0.578	0.684	0.888	—	—
220.87	0.468	0.518	0.640	0.758	0.986	1.20 ¹⁾	—
250.98	0.535	0.592	0.732	0.869	1.13	1.39 ¹⁾	1.63 ¹⁾
281.1	0.601	0.666	0.825	0.980	1.28	1.57	1.85
301.2	0.646	0.715	0.886	1.05	1.38	1.70	2.00
321.3	—	0.765	0.948	1.13	1.48	1.82	2.15
351.4	—	0.838	1.04	1.24	1.63	2.00	2.37
381.5	—	0.912	1.13	1.35	1.78	2.19	2.59
401.6	—	0.962	1.20	1.42	1.87	2.31	2.74
411.6	—	0.990	1.22	1.46	1.92	2.37	2.81
44.51.75	—	1.07	1.33	1.59	2.10	2.59	3.07
481.9	—	—	1.44	1.72	2.27	2.81	3.33
502.0	—	—	1.50	1.79	2.37	2.93	3.48
552.2	—	—	1.66	1.98	2.61	3.24	3.85
572.2	—	—	1.72	2.05	2.71	3.36	4.00
602.4	—	—	1.81	2.16	2.86	3.55	4.22
76.13.00	—	—	—	2.76	3.65	4.54	5.41
88.93.50	—	—	—	—	4.29	5.33	6.36

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0.9 mm (kg/m)

1.0 mm (kg/m)

1.25 mm (kg/m)

1.5 mm (kg/m)

2.0 mm (kg/m)

2.5 mm (kg/m)

3.0 mm (kg/m)

Outer diameter (mmin)

160.63

0.9 mm (kg/m)

0.335

1.0 mm (kg/m)

0.370

1.25 mm (kg/m)

0.455

1.5 mm (kg/m)

0.536

2.0 mm (kg/m)

0.691 ¹⁾

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Outer diameter (mmin)

180.71

0.9 mm (kg/m)

0.380

1.0 mm (kg/m)

0.419

1.25 mm (kg/m)

0.516

1.5 mm (kg/m)

0.610

2.0 mm (kg/m)

0.789

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Outer diameter (mmin)

190.75

0.9 mm (kg/m)

0.402

1.0 mm (kg/m)

0.444

1.25 mm (kg/m)

0.547

1.5 mm (kg/m)

0.647

2.0 mm (kg/m)

0.838

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Outer diameter (mmin)

200.79

0.9 mm (kg/m)

0.424

1.0 mm (kg/m)

0.469

1.25 mm (kg/m)

0.578

1.5 mm (kg/m)

0.684

2.0 mm (kg/m)

0.888

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Outer diameter (mmin)

220.87

0.9 mm (kg/m)

0.468

1.0 mm (kg/m)

0.518

1.25 mm (kg/m)

0.640

1.5 mm (kg/m)

0.758

2.0 mm (kg/m)

0.986

2.5 mm (kg/m)

1.20 ¹⁾

3.0 mm (kg/m)

—

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Outer diameter (mmin)

250.98

0.9 mm (kg/m)

0.535

1.0 mm (kg/m)

0.592

1.25 mm (kg/m)

0.732

1.5 mm (kg/m)

0.869

2.0 mm (kg/m)

1.13

2.5 mm (kg/m)

1.39 ¹⁾

3.0 mm (kg/m)

1.63 ¹⁾

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Outer diameter (mmin)

281.1

0.9 mm (kg/m)

0.601

1.0 mm (kg/m)

0.666

1.25 mm (kg/m)

0.825

1.5 mm (kg/m)

0.980

2.0 mm (kg/m)

1.28

2.5 mm (kg/m)

1.57

3.0 mm (kg/m)

1.85

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Outer diameter (mmin)

301.2

0.9 mm (kg/m)

0.646

1.0 mm (kg/m)

0.715

1.25 mm (kg/m)

0.886

1.5 mm (kg/m)

1.05

2.0 mm (kg/m)

1.38

2.5 mm (kg/m)

1.70

3.0 mm (kg/m)

2.00

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Outer diameter (mmin)

321.3

0.9 mm (kg/m)

—

1.0 mm (kg/m)

0.765

1.25 mm (kg/m)

0.948

1.5 mm (kg/m)

1.13

2.0 mm (kg/m)

1.48

2.5 mm (kg/m)

1.82

3.0 mm (kg/m)

2.15

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Outer diameter (mmin)

351.4

0.9 mm (kg/m)

—

1.0 mm (kg/m)

0.838

1.25 mm (kg/m)

1.04

1.5 mm (kg/m)

1.24

2.0 mm (kg/m)

1.63

2.5 mm (kg/m)

2.00

3.0 mm (kg/m)

2.37

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Outer diameter (mmin)

381.5

0.9 mm (kg/m)

—

1.0 mm (kg/m)

0.912

1.25 mm (kg/m)

1.13

1.5 mm (kg/m)

1.35

2.0 mm (kg/m)

1.78

2.5 mm (kg/m)

2.19

3.0 mm (kg/m)

2.59

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Outer diameter (mmin)

401.6

0.9 mm (kg/m)

—

1.0 mm (kg/m)

0.962

1.25 mm (kg/m)

1.20

1.5 mm (kg/m)

1.42

2.0 mm (kg/m)

1.87

2.5 mm (kg/m)

2.31

3.0 mm (kg/m)

2.74

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Outer diameter (mmin)

411.6

0.9 mm (kg/m)

—

1.0 mm (kg/m)

0.990

1.25 mm (kg/m)

1.22

1.5 mm (kg/m)

1.46

2.0 mm (kg/m)

1.92

2.5 mm (kg/m)

2.37

3.0 mm (kg/m)

2.81

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Outer diameter (mmin)

44.51.75

0.9 mm (kg/m)

—

1.0 mm (kg/m)

1.07

1.25 mm (kg/m)

1.33

1.5 mm (kg/m)

1.59

2.0 mm (kg/m)

2.10

2.5 mm (kg/m)

2.59

3.0 mm (kg/m)

3.07

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Outer diameter (mmin)

481.9

0.9 mm (kg/m)

—

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.44

1.5 mm (kg/m)

1.72

2.0 mm (kg/m)

2.27

2.5 mm (kg/m)

2.81

3.0 mm (kg/m)

3.33

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Outer diameter (mmin)

502.0

0.9 mm (kg/m)

—

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.50

1.5 mm (kg/m)

1.79

2.0 mm (kg/m)

2.37

2.5 mm (kg/m)

2.93

3.0 mm (kg/m)

3.48

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Outer diameter (mmin)

552.2

0.9 mm (kg/m)

—

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.66

1.5 mm (kg/m)

1.98

2.0 mm (kg/m)

2.61

2.5 mm (kg/m)

3.24

3.0 mm (kg/m)

3.85

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Outer diameter (mmin)

572.2

0.9 mm (kg/m)

—

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.72

1.5 mm (kg/m)

2.05

2.0 mm (kg/m)

2.71

2.5 mm (kg/m)

3.36

3.0 mm (kg/m)

4.00

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Outer diameter (mmin)

602.4

0.9 mm (kg/m)

—

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.81

1.5 mm (kg/m)

2.16

2.0 mm (kg/m)

2.86

2.5 mm (kg/m)

3.55

3.0 mm (kg/m)

4.22

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Outer diameter (mmin)

76.13.00

0.9 mm (kg/m)

—

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

2.76

2.0 mm (kg/m)

3.65

2.5 mm (kg/m)

4.54

3.0 mm (kg/m)

5.41

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Outer diameter (mmin)

88.93.50

0.9 mm (kg/m)

—

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

—

2.0 mm (kg/m)

4.29

2.5 mm (kg/m)

5.33

3.0 mm (kg/m)

6.36

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¹⁾ Elongation A-value according to +CR2, 12%.

Square Dimensions

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Height x Width (mm)	1.0 mm (kg/m)	1.25 mm (kg/m)	1.5 mm (kg/m)	2.0 mm (kg/m)	2.5 mm (kg/m)	3.0 mm (kg/m)
19 x 19	0.564	0.694	0.820	1.06 ¹⁾	—	—
20 x 20	0.595	0.733	0.868	1.12 ¹⁾	—	—
25 x 25	0.752	0.930	1.10	1.44	—	—
30 x 30	0.909	1.13	1.34	1.75	2.15	2.39
32 x 32	0.972	1.20	1.43	1.88	2.31	2.58
35 x 35	1.07	1.32	1.57	2.07	2.54	2.86
40 x 40	—	1.52	1.81	2.38	2.93	3.33
50 x 50	—	1.91	2.28	3.01	3.72	4.28
60 x 60	—	—	2.75	3.64	4.50	5.22
70 x 70	—	—	—	4.26	5.29	6.16

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1.0 mm (kg/m)

1.25 mm (kg/m)

1.5 mm (kg/m)

2.0 mm (kg/m)

2.5 mm (kg/m)

3.0 mm (kg/m)

Height x Width (mm)

19 x 19

1.0 mm (kg/m)

0.564

1.25 mm (kg/m)

0.694

1.5 mm (kg/m)

0.820

2.0 mm (kg/m)

1.06 ¹⁾

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Height x Width (mm)

20 x 20

1.0 mm (kg/m)

0.595

1.25 mm (kg/m)

0.733

1.5 mm (kg/m)

0.868

2.0 mm (kg/m)

1.12 ¹⁾

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Height x Width (mm)

25 x 25

1.0 mm (kg/m)

0.752

1.25 mm (kg/m)

0.930

1.5 mm (kg/m)

1.10

2.0 mm (kg/m)

1.44

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Height x Width (mm)

30 x 30

1.0 mm (kg/m)

0.909

1.25 mm (kg/m)

1.13

1.5 mm (kg/m)

1.34

2.0 mm (kg/m)

1.75

2.5 mm (kg/m)

2.15

3.0 mm (kg/m)

2.39

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Height x Width (mm)

32 x 32

1.0 mm (kg/m)

0.972

1.25 mm (kg/m)

1.20

1.5 mm (kg/m)

1.43

2.0 mm (kg/m)

1.88

2.5 mm (kg/m)

2.31

3.0 mm (kg/m)

2.58

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Height x Width (mm)

35 x 35

1.0 mm (kg/m)

1.07

1.25 mm (kg/m)

1.32

1.5 mm (kg/m)

1.57

2.0 mm (kg/m)

2.07

2.5 mm (kg/m)

2.54

3.0 mm (kg/m)

2.86

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Height x Width (mm)

40 x 40

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.52

1.5 mm (kg/m)

1.81

2.0 mm (kg/m)

2.38

2.5 mm (kg/m)

2.93

3.0 mm (kg/m)

3.33

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Height x Width (mm)

50 x 50

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.91

1.5 mm (kg/m)

2.28

2.0 mm (kg/m)

3.01

2.5 mm (kg/m)

3.72

3.0 mm (kg/m)

4.28

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Height x Width (mm)

60 x 60

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

2.75

2.0 mm (kg/m)

3.64

2.5 mm (kg/m)

4.50

3.0 mm (kg/m)

5.22

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Height x Width (mm)

70 x 70

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

—

2.0 mm (kg/m)

4.26

2.5 mm (kg/m)

5.29

3.0 mm (kg/m)

6.16

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¹⁾ Elongation A-value according to +CR2, 12%.

Rectangular Dimensions

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Height x Width (mm)	1.0 mm (kg/m)	1.25 mm (kg/m)	1.5 mm (kg/m)	2.0 mm (kg/m)	2.5 mm (kg/m)	3.0 mm (kg/m)
25 x 15	0.595	0.733	0.868	1.12 ¹⁾	—	—
30 x 10	0.595	0.733	0.868	1.12	—	—
30 x 15	0.673	0.831	0.985	1.28	—	—
30 x 20	0.752	0.930	1.10	1.44	—	—
30 x 25	0.830	1.03	1.22	1.59	1.95	—
35 x 15	0.752	0.930	1.10	1.44	—	—
35 x 20	0.830	1.03	1.22	1.59	1.95	—
40 x 20	0.909	1.13	1.34	1.75	2.15	—
40 x 25	0.987	1.22	1.46	1.91	2.34	—
40 x 30	1.07	1.32	1.57	2.07	2.54	2.86
50 x 20	1.07	1.32	1.57	2.07	2.54	2.86
50 x 25	—	1.42	1.69	2.22	2.74	3.10
50 x 30	—	1.52	1.81	2.38	2.93	3.33
50 x 40	—	1.71	2.05	2.69	3.33	3.80
60 x 20	—	1.52	1.81	2.38	2.93	3.33
60 x 30	—	1.71	2.05	2.69	3.33	3.80
60 x 40	—	1.91	2.28	3.01	3.72	4.28
70 x 25	—	—	2.16	2.85	3.52	4.04
70 x 30	—	—	2.28	3.01	3.72	4.28
70 x 50	—	—	2.75	3.64	4.50	5.22
80 x 20	—	—	2.28	3.01	3.72	4.28
80 x 30	—	—	2.52	3.32	4.11	4.74
80 x 40	—	—	2.75	3.64	4.50	5.22
80 x 60	—	—	—	4.26	5.29	6.16
100 x 40	—	—	—	4.26	5.29	6.16

Compare parameters

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1.0 mm (kg/m)

1.25 mm (kg/m)

1.5 mm (kg/m)

2.0 mm (kg/m)

2.5 mm (kg/m)

3.0 mm (kg/m)

Height x Width (mm)

25 x 15

1.0 mm (kg/m)

0.595

1.25 mm (kg/m)

0.733

1.5 mm (kg/m)

0.868

2.0 mm (kg/m)

1.12 ¹⁾

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Height x Width (mm)

30 x 10

1.0 mm (kg/m)

0.595

1.25 mm (kg/m)

0.733

1.5 mm (kg/m)

0.868

2.0 mm (kg/m)

1.12

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Height x Width (mm)

30 x 15

1.0 mm (kg/m)

0.673

1.25 mm (kg/m)

0.831

1.5 mm (kg/m)

0.985

2.0 mm (kg/m)

1.28

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Height x Width (mm)

30 x 20

1.0 mm (kg/m)

0.752

1.25 mm (kg/m)

0.930

1.5 mm (kg/m)

1.10

2.0 mm (kg/m)

1.44

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Height x Width (mm)

30 x 25

1.0 mm (kg/m)

0.830

1.25 mm (kg/m)

1.03

1.5 mm (kg/m)

1.22

2.0 mm (kg/m)

1.59

2.5 mm (kg/m)

1.95

3.0 mm (kg/m)

—

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Height x Width (mm)

35 x 15

1.0 mm (kg/m)

0.752

1.25 mm (kg/m)

0.930

1.5 mm (kg/m)

1.10

2.0 mm (kg/m)

1.44

2.5 mm (kg/m)

—

3.0 mm (kg/m)

—

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Height x Width (mm)

35 x 20

1.0 mm (kg/m)

0.830

1.25 mm (kg/m)

1.03

1.5 mm (kg/m)

1.22

2.0 mm (kg/m)

1.59

2.5 mm (kg/m)

1.95

3.0 mm (kg/m)

—

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Height x Width (mm)

40 x 20

1.0 mm (kg/m)

0.909

1.25 mm (kg/m)

1.13

1.5 mm (kg/m)

1.34

2.0 mm (kg/m)

1.75

2.5 mm (kg/m)

2.15

3.0 mm (kg/m)

—

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Height x Width (mm)

40 x 25

1.0 mm (kg/m)

0.987

1.25 mm (kg/m)

1.22

1.5 mm (kg/m)

1.46

2.0 mm (kg/m)

1.91

2.5 mm (kg/m)

2.34

3.0 mm (kg/m)

—

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Height x Width (mm)

40 x 30

1.0 mm (kg/m)

1.07

1.25 mm (kg/m)

1.32

1.5 mm (kg/m)

1.57

2.0 mm (kg/m)

2.07

2.5 mm (kg/m)

2.54

3.0 mm (kg/m)

2.86

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Height x Width (mm)

50 x 20

1.0 mm (kg/m)

1.07

1.25 mm (kg/m)

1.32

1.5 mm (kg/m)

1.57

2.0 mm (kg/m)

2.07

2.5 mm (kg/m)

2.54

3.0 mm (kg/m)

2.86

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Height x Width (mm)

50 x 25

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.42

1.5 mm (kg/m)

1.69

2.0 mm (kg/m)

2.22

2.5 mm (kg/m)

2.74

3.0 mm (kg/m)

3.10

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Height x Width (mm)

50 x 30

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.52

1.5 mm (kg/m)

1.81

2.0 mm (kg/m)

2.38

2.5 mm (kg/m)

2.93

3.0 mm (kg/m)

3.33

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Height x Width (mm)

50 x 40

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.71

1.5 mm (kg/m)

2.05

2.0 mm (kg/m)

2.69

2.5 mm (kg/m)

3.33

3.0 mm (kg/m)

3.80

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Height x Width (mm)

60 x 20

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.52

1.5 mm (kg/m)

1.81

2.0 mm (kg/m)

2.38

2.5 mm (kg/m)

2.93

3.0 mm (kg/m)

3.33

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Height x Width (mm)

60 x 30

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.71

1.5 mm (kg/m)

2.05

2.0 mm (kg/m)

2.69

2.5 mm (kg/m)

3.33

3.0 mm (kg/m)

3.80

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Height x Width (mm)

60 x 40

1.0 mm (kg/m)

—

1.25 mm (kg/m)

1.91

1.5 mm (kg/m)

2.28

2.0 mm (kg/m)

3.01

2.5 mm (kg/m)

3.72

3.0 mm (kg/m)

4.28

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Height x Width (mm)

70 x 25

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

2.16

2.0 mm (kg/m)

2.85

2.5 mm (kg/m)

3.52

3.0 mm (kg/m)

4.04

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Height x Width (mm)

70 x 30

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

2.28

2.0 mm (kg/m)

3.01

2.5 mm (kg/m)

3.72

3.0 mm (kg/m)

4.28

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Height x Width (mm)

70 x 50

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

2.75

2.0 mm (kg/m)

3.64

2.5 mm (kg/m)

4.50

3.0 mm (kg/m)

5.22

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Height x Width (mm)

80 x 20

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

2.28

2.0 mm (kg/m)

3.01

2.5 mm (kg/m)

3.72

3.0 mm (kg/m)

4.28

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Height x Width (mm)

80 x 30

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

2.52

2.0 mm (kg/m)

3.32

2.5 mm (kg/m)

4.11

3.0 mm (kg/m)

4.74

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Height x Width (mm)

80 x 40

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

2.75

2.0 mm (kg/m)

3.64

2.5 mm (kg/m)

4.50

3.0 mm (kg/m)

5.22

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Height x Width (mm)

80 x 60

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

—

2.0 mm (kg/m)

4.26

2.5 mm (kg/m)

5.29

3.0 mm (kg/m)

6.16

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Height x Width (mm)

100 x 40

1.0 mm (kg/m)

—

1.25 mm (kg/m)

—

1.5 mm (kg/m)

—

2.0 mm (kg/m)

4.26

2.5 mm (kg/m)

5.29

3.0 mm (kg/m)

6.16

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¹⁾ Elongation A-value according to +CR2, 12%.

Mechanical Properties

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Yield strength R_p0.2 (min MPa)	Tensile strength R_m (min MPa)	Elongation A (min %)
420	490	14

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Tensile strength R_m
(min MPa)

Elongation A
(min %)

Yield strength R_p0.2
(min MPa)

420

Tensile strength R_m
(min MPa)

490

Elongation A
(min %)

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Mechanical properties meet or exceed the requirements of EN 10305 (+CR2).

Chemical Composition (ladle analysis)

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C (max %)	Si¹⁾ (max %)	Mn (max %)	P¹⁾ (max %)	S²⁾ (max %)	Al_tot³⁾ (min %)
0.12	0.50	1.70	0.020 ²⁾	0.020	0.020

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Si¹⁾
(max %)

Mn
(max %)

P¹⁾
(max %)

S²⁾
(max %)

Al_tot³⁾
(min %)

C
(max %)

0.12

Si¹⁾
(max %)

0.50

Mn
(max %)

1.70

P¹⁾
(max %)

0.020 ²⁾

S²⁾
(max %)

0.020

Al_tot³⁾
(min %)

0.020

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Chemical composition meets or exceeds the requirements of EN 10305.

If other chemical elements such as Ti, Nb or V are used, the content of these elements are reported in the inspection document.

¹⁾ SSAB Form Tube H grade is suitable for high quality hot-dip galvanizing (Si < 0.03%, Si +2.5P < 0.06%)

²⁾ Low level of impurities ensure excellent formability and weldability

³⁾ This requirement is not applicable provided the steel contains a sufficient amount of other nitrogen binding elements, such as Ti, Nb or V.

Tolerances

Tolerance Circular

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Characteristic	Circular precision tubes Tolerances meet or exceed the requirements of EN 10305-3
Outside diameter (D) ⁽¹ D < 20 mm 20 ≤ D < 32 mm 32 ≤ D < 44 mm 44 ≤ D < 55 mm 55 ≤ D < 70 mm 70 ≤ D < 80 mm 80 ≤ D < 100 mm	±0.12 mm ±0.15 mm ±0.20 mm ±0.25 mm ±0.30 mm ±0.35 mm ±0.40 mm
Out-of-roundness	The diameter tolerances include the out-of-roundness
Thickness (T)	T ≤ 1.5 mm: ±0.15 mm T >1.5 mm: ±10% of nominal thickness or ±0.35 mm whichever is the smaller
Straightness	Maximum 0.15% of measured length
Height of internal weld bead, g; Bead removed Bead not removed	g ≤ 0.3 mm g < 0.6 mm, when T ≤ 1.5 mm g < 0.4 x T, when 1.5 mm < T ≤ 3.0 mm
Mill length	0/+50 mm, standard length 6000 mm
Exact length, single cutting	Agreed at the time of enquiry and order
Exact length, bundle cutting	Agreed at the time of enquiry and order

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