The round steel pipe is also know as round steel tube, or circular hollow section. The round steel pipe can be seamless - SMLS pipe, longitudinal submerged arc welding - LSAW pipe, Electrical Resistance Weld - ERW pipe, Spiral Submerged Arc Welding - SSAW pipe. For the round steel pipe, we also provide concrete weight coating and anti-corrosion treatment, such as 3PE / 3LPE, FBE.
The main round steel pipe types we supply are structural steel pipe, line pipe, boiler pipe, pipe for conveyance of fluid, low temperature service pipe, gas cylinder pipe, fine grain structure pipe, pipe for pressure purposes, tubing and casing, etc.
Main standard and steel grades of the round steel pipe hollow steel section:
| Standard |
Steel grades |
| ASTM A53 |
A53A |
A53B |
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| ASTM A106 |
A106A |
A106B |
A106C |
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| ASTM A333 |
grade 1 |
grade 3 |
grade 4 |
grade 6 |
grade 7 |
grade 8 |
grade 9 |
grade 10 |
grade 11 |
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| ASTM A519 |
1020 |
1035 |
1045 |
4130 |
4140 |
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| ASME SA106M |
SA106B |
SA106C |
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| ASME SA179 |
SA179 |
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| ASME SA192M |
SA192 |
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| ASME SA210M |
SA210A1 |
SA210C |
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| ASME SA213 |
T2 |
T5 |
T9 |
T11 |
T12 |
T22 |
T91 |
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| ASME SA335 |
P2 |
P5 |
P9 |
P11 |
P12 |
P22 |
P91 |
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| GB/T 3087 |
10# |
20# |
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| GB/T 5310 |
20G |
20MnG |
25MnG |
15MoG |
12CrMoG |
15CrMoG |
12Cr1MoG |
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| GB/T 8162 |
10# |
20# |
35# |
45# |
Q345A |
Q345B |
Q345C |
Q345D |
Q345E |
20Cr |
| 40Cr |
20Mn2 |
45Mn2 |
40CrB |
27SiMn |
15CrMo |
20CrMo |
35CrMo |
42CrMo |
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| GB/T 8163 |
10# |
20# |
Q345A |
Q345B |
Q345C |
Q345D |
Q345E |
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| GB/T 18248 |
37MN |
30CrMo |
35CrMo |
34CrMo4 |
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| DIN1629 |
St37.0 |
St44.0 |
St55 |
St52.0 |
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| DIN17175 |
St35.8 |
St45.8 |
15Mo3 |
17Mn4 |
13CrMo44 |
10CrMo910 |
14MoV63 |
12Cr1MoV |
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| EN 10210 |
S235JRH |
S275J0H |
S275J2H |
S355J0H |
S355J2H |
S355K2H |
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| EN10216-1 |
P195TR1 |
P195TR2 |
P235TR1 |
P235TR2 |
P265TR1 |
P265TR2 |
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| EN10216-2 |
P195GH |
P235GH |
P265GH |
16Mo3 |
13CrMo4-5 |
10CrMo9-10 |
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| EN10297 |
E355 |
C45E |
25CrMo4 |
30CrMo4 |
34CrMo4 |
42CrMo4 |
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| JIS G3441 |
SCM420TK |
SCM440TK |
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| JIS G3445 |
STKM13A |
STKM19A |
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| JIS G3454 |
STPG 370 |
STPG 410 |
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| JIS G3455 |
STS 370 |
STS 410 |
STS 480 |
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| JIS G3456 |
STPT 370 |
STPT 410 |
STPT 480 |
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| JIS G3461 |
STB 340 |
STB 410 |
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| API 5L PSL1 |
A25 |
grade A |
grade B |
X42 |
X46 |
X52 |
X56 |
X60 |
X65 |
X70 |
| X80 |
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| API 5L PSL2 |
grade B |
X42 |
X46 |
X52 |
X56 |
X60 |
X65 |
X70 |
X80 |
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| BQ |
X42Q |
X46Q |
X52Q |
X56Q |
X60Q |
X65Q |
X70Q |
X80Q |
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| X42QS |
X46QS |
X52QS |
X56QS |
X60QS |
X65QS |
X70QS |
X80QS |
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| BM |
X42M |
X46M |
X52M |
X56M |
X60M |
X65M |
X70M |
X80M |
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| X42MO |
X46MO |
X52MO |
X56MO |
X60MO |
X65MO |
X70MO |
X80MO |
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| ISO3183 PSL1 |
L175 |
L210 |
L245 |
L290 |
L320 |
L360 |
L390 |
L415 |
L450 |
L485 |
| ISO3183 PSL2 |
L245 |
L290 |
L320 |
L360 |
L390 |
L415 |
L450 |
L485 |
L555 |
L625 |
| L690 |
L830 |
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| GB/T 9711 PSL1 |
L175 |
L210 |
L245 |
L290 |
L320 |
L360 |
L390 |
L415 |
L450 |
L485 |
| GB/T 9711 PSL2 |
L245 |
L290 |
L320 |
L360 |
L390 |
L415 |
L450 |
L485 |
L555 |
L625 |
| L690 |
L830 |
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| API 5CT |
J55 |
K55 |
N80 |
L80-1 |
C90-1 |
C90-2 |
C95 |
T95-1 |
T95-2 |
P110 |
The round steel pipe circular hollow section is used to transport fluid and powder solids, exchange heat energy, manufacture mechanical parts and containers. It is an economic steel. Making highway bridges with steel pipes can not only save steel and simplify construction, but also greatly reduce the area of protective coating and save investment and maintenance costs.
