Standard: BS6323-5 Seamless and Welded steel tubes for Automobile,Mechanical and General Engineering Purposes
Part 5: Specific requirements for electric resistance welded (including induction) steel tubes
End use: for Auto Industry / for Machinery Use/Mechanical and General Engineering Purposes Size range: O.D.:6-350mm W.T.:1-30mm L:max12000mm
Condition:KM As-welded and sized
GKM(S)Welded and sized(fully softened)
GZF(S) Welded and sized(fully softened)(including de-scaling)
GBK(S)Cold finished (fully softened)
GZF(S)Cold finished (fully softened) (including de-scaling)
Steel Grade and Chemical Compositions:
|
Desig
nation
|
Chemical Compositions( ladle analysis)
|
Mechanical properties
|
|
C
|
Si
|
Mn
|
P
|
S
|
KM (as welded)
|
GMK and GZF (annealed
|
NKM and NZF(normalzied)
|
| |
max.
|
max.
|
max.
|
max.
|
max.
|
Re
min.
|
Rm
min.
|
A
min
|
A
min.
|
Re
min.
|
Rm
min.
|
A
min.
|
Re
min.
|
Rm
min.
|
A
min.
|
| |
|
|
|
|
|
|
|
D/a≤
20
|
D/a>
20
|
|
|
|
|
|
|
| |
%
|
%
|
%
|
%
|
%
|
N/m
m2
|
N/m
m2
|
%
|
%
|
N/m
m2
|
N/m
m2
|
%
|
N/m
m2
|
N/m
m2
|
%
|
|
ERW 1
|
0.13
|
__
|
0.60
|
0.050
|
0.050
|
200
|
300
|
10
|
20
|
150
|
270
|
27
|
155
|
280
|
25
|
|
ERW 2
|
0.16
|
__
|
0.70
|
0.050
|
0.050
|
250
|
340
|
8
|
15
|
195
|
300
|
27
|
195
|
320
|
25
|
|
ERW 3
|
0.20
|
0.35
|
0.90
|
0.050
|
0.050
|
300
|
400
|
7
|
12
|
215
|
340
|
26
|
215
|
360
|
24
|
|
ERW 4
|
0.25
|
0.35
|
1.20
|
0.050
|
0.050
|
350
|
450
|
6
|
10
|
235
|
400
|
24
|
235
|
410
|
22
|
|
ERW 5
|
0.23
|
0.50
|
1.50
|
0.050
|
0.050
|
420
|
420
|
6
|
8
|
340
|
__
|
__
|
340
|
490
|
20
|
|
Diameter
|
Tolerance
|
|
1
|
2
|
3
|
|
over
|
Up to and including
|
KM condition D/a
≤40 GKM,GZF,
NKM, NZF condition≤20
|
GKM, GZF,NKM, NZF condition 20<D/a≤40
|
|
|
mm
|
mm
|
mm
|
mm
|
mm
|
|
|
20
|
±0.12
|
±0.18
|
±0.24
|
|
20
|
30
|
±0.15
|
±0.22
|
±0.30
|
|
30
|
50
|
±0.20
|
±0.30
|
±0.40
|
|
50
|
70
|
±0.25
|
±0.37
|
±0.50
|
|
70
|
90
|
±0.30
|
±0.45
|
±0.60
|
|
90
|
110
|
±0.35
|
±0.52
|
±0.70
|
|
110
|
130
|
±0.45
|
±0.68
|
±0.90
|
|
130
|
150
|
±0.55
|
±0.82
|
±1.10
|
|
150
|
170
|
±0.65
|
±0.97
|
±1.30
|
|
170
|
|
±0.75% of outside
diameter
|
±1% of outside diameter
|
±1.5% of outside diameter
|
Note: Special steel grade is also available, according to customer request.
Usage:
