Steel pipe: 1. seamless steel tubes in small calibers for pressure boilers and petrochemical industry: Material grade and specification: 10、20、20G、20MnG、25MnG、15CrMoG、12Cr2MoG、12Cr1MoVG、12Cr2MoWVTiB、10Cr9Mo1VNb、SA210A1、SA210C、SA213 T11、SA213 T12、SA213 T22、SA213 T23、SA213 T91、SA213 T92、ST45.8/Ⅲ、15Mo3、13CrMo44、10CrMo910etc.
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Types of steel tubes |
Outer diameters |
Wall thickness | ||
|
Cold-rolled tubes |
Tube sizes(mm) |
Tolerances(mm) |
Tube sizes (mm) |
Tolerances(mm) |
|
＞30～50 |
±0.3 |
＞3～20 |
±10％ | |
2. Seamless steel tubes fro oil casing and tubing: Material grade and specification: J55，N80，L80，P110 etc．
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Types of steel tubes |
Outer diameter |
Wall thickness | |
|
Cold-rolled tubes |
Tube sizes(mm) |
Tolerances(mm) |
Tolerances(mm) |
|
＜114.3 |
±0.79 |
－12.5％ | |
|
≥114.3 |
－0.5％，＋1％ | ||
3.Seamless steel tubes for pipe line: Material grade and specification: B,X42,X52,X60,X65,X70
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Steel Pipe Specification |
Steel Pipe Outside Diameter（D） |
Steel Pipe Wall Thickness（S） | ||
|
Pipe Body |
Steel Pipe Outside Diameter (mm) |
Allowable deviation (mm) |
Steel Pipe Outside Diameter (mm) |
Allowable Deviation (mm) |
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≥60.3且S＜20 |
±0.75％ |
≤73.0 |
＋15％，－12.5％ | |
|
≥60.3且S≥20 |
±1.00％ |
＞73.0且S＜20 |
＋15％，－12.5％ | |
|
|
|
＞73.0且S≥20 |
＋17.5％，－10 | |
4.Seamless steel tubes for high pressure chemical fertilizer processing: Material grade and specification: 10、20、16Mn、10MoWVNb、15CrMo、1Cr5Mo、12 Cr2Moetc
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Types of steel tubes |
Outer diameter |
Wall thickness | ||
|
Cold-rolled tubes |
Tube sizes(mm) |
Tolerances(mm) |
Tube sizes (mm) |
Tolerances(mm) |
|
＞30～50 |
±0.3 |
≤30 |
±10％ | |
|
＞50～219 |
±0.8％ | |||
5.Seamess steel for structure: Material grade and specification: 1 O，20，35、45，Q345，1 5CrMo，1 2Crl MoV,A53A，A53B，SA53A，SA53B, etc．
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Types of steel tubes |
Outer diameter |
Wall thickness | ||
|
Cold-rolled tubes |
Tube sizes(mm) |
Tolerances(mm) |
Tube sizes (mm) |
Tolerances(mm) |
|
＞30～50 |
±0.3 |
≤30 |
±10％ | |
|
|
| |||
6. Seamess steel for transmission of fluids: Material grade and specification : 10．20，Q345，etc．
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Types of steel tubes |
Outer diameter |
Wall thickness | ||
|
Cold-rolled tubes |
Tube sizes(mm) |
Tolerances(mm) |
Tube sizes (mm) |
Tolerances(mm) |
|
＞30～50 |
±0.3 |
≤30 |
±10％ | |
|
＞50～219 |
±0.8％ | |||
7. Seamess steel for ships: Material grade and specification : 320，360，410，460，490，
|
Types of steel tubes |
Outer diameters |
wall thickness | ||
|
Cold-rolled tubes |
Tube size(mm) |
tolerances(mm) |
Tube sizes (mm) |
Tolerances(mm) |
|
＞30～50 |
±0.3 |
≤30 |
±10％ | |
|
＞50～219 |
±0.8％ | |||
8. Spiral both side Submerged Arc Weled Pipe (SSAW) :Material grade and specification : Q235B,20#,X42-70,etc．
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Types of steel tubes |
Outer diameters |
wall thickness | ||
|
Cold rolled tubes |
Tube size(mm) |
tolerances(mm) |
Tube sizes (mm) |
Tolerances(mm) |
|
325-1020 |
±0.3 |
7-40mm |
±10％ | |
9.Spiral weled pipe: Material grade and specification :B-X70 ,etc．
|
Types of steel tubes |
Outer diameters |
wall thickness | ||
|
Cold-rolled tubes |
Tube size(mm) |
tolerances(mm) |
Tube sizes (mm) |
Tolerances(mm) |
|
218-1820 |
±0.3 |
5-6 |
±10％ | |
10.Straight seam high frequency welded pipe, Hot rolled expanding pipe etc
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