CK45 Ck20 St52 STkm-13C Precision Tubing With Cold Drawn Rolled Process

OD(mm)

ID (mm)

Tolerance

OD (mm)

ID (mm)

Wall thickness deviation (mm)

Ovality (mm)

Curvature(mm/m)

40-74

30-65

±.01

-0.3,-0.5

≤0.5

≤0.1

0.3

74-98

65-85

±.01

-0.4,-0.6

≤0.5

≤0.15

0.3

100-116

85-100

±.02

-0.4,-0.6

≤0.6

≤0.15

0.3

124-134

110-115

±.02

-0.6,-0.8

≤0.6

≤0.20

0.3

140-158

120-135

±.02

-0.7,-0.9

≤0.8

≤0.20

0.3

165-176

140-150

±.02

-0.7,-0.9

≤0.8

≤0.20

0.3

188-203

160-180

±.02

-0.7,-0.9 Honed

≤0.8

≤0.20

0.3

No.

Inside diameter(mm)

ID machining allowance(mm)

1

50-80

0.5-0.8

2

81-125

0.7-1.1

3

125-200

0.9-1.2

4

200-250

1-1.5

Other dimension can be customized

No.

ID Min.(mm)

Length(mm)

1

50

700—2000

2

63

700—3000

3

80

700—4000

4

>90

700—6000

Other dimension can be customized

Standard

DIN2391, DIN2445, EN10305, GB/T 3639, GB 8713

Grade

ST35(E235), ST37, ST24(E255), ST52(E355), 10#, 20#, 35#, 45#

O.D.

4.0MM-400MM

W.T.

0.5MM-18MM

Surface Treatment

bare, varnished,oiled, anti-corrosion coating as request

Packing

1. bundle packing

2. marking as per customer's requests

3. paint on the pipe as per customer request

4. pipe caps as customer request

Condirion of Delivery

1. NBK(+N)

after cold forming, eventually above phase transition point, in a protective atmosphere of annealing oxidation medium

2. GBK(+A)

after cold forming, annealing in non oxidizing medium protective gas

3. BK(+C)

the final heat treatment after cold forming, threfore small steel pipe plasticly, the plasticly degree does not guarantee

4. BKW(+LC)

after final heat treatment, a tiny cold drawing deformation, continue again when machining steel pipe allowed inside certain limits cold deformation(bending, flaring)

5. BKS(+SR)

have a stress relief after cold forming, heat treatment, steel pipe can be carried out within a certain limit in the appropriate processing again

OD x WT

OD x WT

OD x WT

OD x WT

4*0.5

16*0.5

26*1.8

35*9.0

4*0.8

16*0.8

26*2.0

35*10

4*1.0

16*1.0

26*2.2

38*0.5

4*1.2

16*1.2

26*2.5

38*0.8

5*0.5

16*1.5

26*2.8

38*1.0

5*0.8

16*1.8

26*3.0

38*1.2

48*5.0

70*2.8

90*10

130*14

48*5.5

70*3.0

90*12

130*16

48*6.0

70*3.5

90*14

130*18

48*7.0

70*4.0

90*16

140*2.5

48*8.0

70*4.5

95*2.0

140*2.8

48*9.0

70*5.0

95*2.2

140*3.0

OD

GB/T3639(GB8713)

DIN2391(EN10305)

Our Tolerence

Best Quality

4-30mm

±0.10mm

±0.08mm

±0.05mm

±0.02mm

31-40mm

±0.15mm

±0.15mm

±0.05mm

±0.03mm

41-50mm

±0.20mm

±0.20mm

±0.05mm

±0.03mm

51-60mm

±0.25mm

±0.25mm

±0.08mm

±0.03mm

61-70mm

±0.30mm

±0.30mm

±0.10mm

±0.05mm

71-160mm

±0.30mm

±0.30mm

±0.10mm

±0.05mm

Tolerance in WT

±0.12mm

±0.10mm

±0.05mm

±0.03mm

Process

Diameter

Length

Precision

Inner Hole Roughness

Cold Rolled

30-100mm

≤12 m

H8-H10

0.4-1.6

Cold Draw

30-250mm

≤12 m

H8-H10

0.8-1.6

Honing

40-500mm

≤12 m

H8-H9

0.4-0.8

Rolling

40-400mm

≤7 m

H8

0.4

Inner Diameter

H8

H9

H10

30mm

±0.033

±0.052

±0.084

5-30mm

30-50mm

±0.039

±0.062

±0.100

±0.080

50-80mm

±0.046

±0.074

±0.120

80-120mm

±0.054

±0.087

±0.140

120-180mm

±0.063

±0.100

±0.160

180-250mm

±0.072

±0.115

±0.185

250-315mm

±0.081

±0.130

±0.210

315-400mm

±0.089

±0.140

±0.230

Condition

Materail Grade

T.S (MPa)

Y.S (MPa)

Elongation(%)

BKS

ST35 (10#)

≥420

≥315

≥14

BKS

ST45(20#)

≥520

≥375

≥12

BKS

ST52(16Mn)

≥580

≥420

≥10

GBK

ST35 (10#)

≥315

≥35

GBK

ST45(20#)

≥390

≥32

GBK

ST52(16Mn)

≥490

≥30

NBK

ST35 (10#)

340-470

≥235

≥32

NBK

ST45(20#)

440-570

≥255

≥30

NBK

ST52(16Mn)

490-630

≥335

≥28