Processing mode

Diameter

Length

Linearity

Precision

Roughness of inner hole

Cold drawn

50-300

less than13.5M

  0.3-1.0

H8-H10

0.8-1.6

Honing

50-300

less than 13.5M

1000

H8-H9

0.4-0.8

Cutting Rolling

50-300

less than7.5M

H8

0.4

Model

Item

Cold drawn (rolling) tube

metallic cut pipe

 20

Intensity of tension σbN/ mm2

≥510

≥390

Elongation rate δ5%

≥5

≥20

45

Intensity of tension σbN/ mm2

≥647

≥590

Elongation rate δ5%

≥4

≥4

16Mn

Intensity of tension σbN/ mm2

≥640

Elongation rate δ5%

≥10

27SiMn

Intensity of tensionσbN/ mm2

≥840

Elongation rate δ5%

≥7.5

Inner diameter

warp of wall thickness

H8

H9

H10

50-80

+0.046
0

+0.074
0

+0.120
0

                           ±5%

80-120

+0.054
0

+0.087
0

+0.140
0

120-180

+0.063
0

+0.100
0

+0.160
0

180-250

+0.072
0

+0.115
0

+0.185
0

 250-300

+0.081
0

+0.130
0

+0.210
0

Hardness

diameter

outer diameter

inner diameter

inner diameter warp

inner diameter warp

roundness≤80m

chromeplate≥8m

chromeplate

28

41.28

28.58

+0.03

-0.05

-0.05

-0.15

0.03

32

44.45

31.75

47.75

38

50.80

38.10

54.10

44

57.10

44.45

60.45

57

69.85

57.15

73.15

70

82.55

69.85

-0.03

-0.15

0.05

85.85

83

95.25

82.55

-0.15

-0.25

98.55

95

111.25

95.25

108

123.95

107.95