Specifications: diameter: 320 to 127 mm thickness: 0.4 to 12.7 mm Length: 6 m above, and, in accordance with customer demand, supply and other specifications of steel pipe

45 # seamless steel pipe


45 # seamless steel pipe size,  steel pipe shape, the weight of  tolerances

A  steel pipe outside diameter tolerances

Table 1  standardization diameter tolerances

45 # seamless steel pipe

Deviation Level

Standardized outside diameter tolerances

D1

± 1.5%, minimum ± 0.75 mm

D2

± 1.0%. Minimum ± 0.50 mm

D3

± 0.75%. Minimum ± 0.30 mm

D4

± 0.50%. Minimum ± 0.10 mm

 
 

Table 5  non-standard diameter tolerances

Deviation Level

Non-standard diameter tolerances,%

ND1

1.25

-1.50

ND2

± 1.25

ND3

1.25

-1.O

ND4

± 0.8

 

45 # seamless steel tubes for special purposes steel and cold-rolled (drawn) steel pipe outside diameter tolerances can be absolute deviation.

2.1  steel pipe wall thickness tolerances

 steel pipe wall thickness tolerances is divided into standardized and non-standardization of two kinds. Preference should be given standardized wall thickness tolerances (see Table 6).

Table 6  wall thickness tolerances

Deviation Level

 wall thickness tolerances

S / D

0.1 <S / D

O . 05 <S / D ≤ 0.1 <SPAN>

0.025 <S / D ≤ 0.05 <the SPAN

The S / D ≤ 0.025

S1

± 15%, minimum ± 0.6 mm

S2

A

± 12.5% ​​Minimum ± 0.4 mm

B

+ positive deviation depends on the weight requirements

-12.5

S3

A

± 10%, minimum ± 0.2mm

B

± 10%

± 12.5%

± 15%

Minimum ± 0.4mm

C

+ positive deviation depends on the weight requirements

-10%

S4

A

± 7.5%, minimum ± 0.15 mm

B

Persons 7.5%

± 10%

± 12.5%

± 15%

Minimum Guests 0.2 mm

S5

± 5%, 0.10 mm minimum with disabilities

Note: S is the steel pipe nominal wall thickness, D is the steel pipe nominal diameter.

               
 

2 .3 45 # seamless steel pipe wall thickness tolerances (see Table 7).

Deviation Level

Non-standard wall thickness tolerance,%

NSl

+15

-12.5

NS2

+15

-10

NS3

+12.5

-10

NS4

-12.5

-7.5

 

 

2 .3 45 # seamless steel tubes for special purposes steel and cold rolled (drawn) steel pipe wall thickness tolerances can be the absolute deviation.

3  length

The usual length of 

The steel pipe is generally the usual length of the delivery. The usual length should meet the following requirements:

Hot-rolled tube (expansion): 3000 ~ 12000 mm

Cold-rolled tube (pull): 2000 ~ 10500 mm

Hot-rolled (expanded) short tube length is not less than 2 m. Cold-rolled (drawn) short foot length of the tube is not less than 1 m

3 .2 cut to length length and double length:

Definite length and double length should be within the scope of the usual length. The full-length tolerances divided into three (see Table 8). Leaving the incision margin of each double length according to the following provisions:

The outer diameter ≤ 159 mm: 5 to 10 mm in;

The outer diameter of 159 mm: 10 of 15 mm.

Table 8  length tolerances

The full-length to allow the bias level

Full-length to allow deviation. mrn

Ll

0 to 20

L2

0 to 10

L3

O ~ j

 

 

3 .3 45 # special-purpose steel pipe seamless steel pipe . Such as stainless steel acid is very thin-walled steel pipe, small diameter, the length of the requirements can be prescribed separately.

4 shape

4 .1  curvature

The bending of the steel pipe is divided into a total length of the curvature and the curvature per m.

4 .1.1  length of the curvature

Total length of the curvature of the steel pipe total length of the measured curvature is called a total length of the curvature is divided into five (see Table 9).

Table 9 45 # seamless steel tubes to a total length of the curvature

Bending grade

Total length of curvature,%

Not more than

E1

0.20

E2

0.1j

E3

0.10

E4

0.08 . .

E5

0.06 -

 

 

4  per meter curvature

Called the curvature per m of pipe per meter length of the curvature measurement. Per meter curvature is divided into five (see Table 1 (J).

10  per meter curvature

Bending grade

Curvature per meter mm / m

Not more than

F1

3.0

F2

2.0

F3

1.5

F4

1.0

F5

0.5

 

 

4 .2 5 # seamless steel pipe ovality

 ovality is divided into four (see Table 11).

Table 11 steel pipe ovality

Oval grade

Ellipticity is not greater than the outer diameter tolerances%

NRl

80

NR2

70

NR3

60

NR4

50

 

 

5  weight

45 # seamless steel pipe according to the actual weight of the delivery. According to theoretical weight delivery. The actual weight of the delivery can be divided into a single weight or weight of each batch two. Per meter of the theoretical weight of the steel pipe according to equation (1) is calculated as follows:

Where: W - steel theoretical weight. kg / m;

π = 3.1416:

ρ - the density of steel. kg / dm 3 ;

D - Steel Pipe public nominal outside diameter, mm

S - steel pipe nominal wall thickness. mm.

5 .1 45 # steel pipe seamless steel pipe according to theoretical weight delivery. A single steel pipe theoretical weight and actual weight allowable deviation is divided into five (see Table 12).

Table 12 the amount of weight  tolerances

The weight allows the bias level

A single steel pipe weight tolerances. %

W1

± 10

W2

± 7.5

W3

+10

-5

W4

+10

-5

W5

+6.5

-3.5

 

1

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