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 nonstandard diameter tolerances
Deviation Level 
Nonstandard 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 coldrolled (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 nonstandardization 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 
Nonstandard 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:
Hotrolled tube (expansion): 3000 ~ 12000 mm
Coldrolled tube (pull): 2000 ~ 10500 mm
Hotrolled (expanded) short tube length is not less than 2 m. Coldrolled (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 fulllength 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 fulllength to allow the bias level 
Fulllength to allow deviation. mrn 
Ll 
0 to 20 
L2 
0 to 10 
L3 
O ~ j 
3 .3 45 # specialpurpose steel pipe seamless steel pipe . Such as stainless steel acid is very thinwalled 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