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

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

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