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GB/T9948 Petroleum Cracking Pipe
Key Word:
Steel Pipe
Category:
Products Detial
GB/T9948 Petroleum Cracking Pipe
GB 9948-2013 Petroleum Cracking Pipe is used to manufacture high-quality carbon structural steel, alloy structural steel and stainless steel heat-resistant seamless pipe for steam boiler pipes such as high pressure and above.
These boiler tubes work under high temperature and high pressure, and the tubes will also oxidize and corrode under the action of high temperature flue gas and water vapor. Therefore, the steel pipe is required to have high durability, high oxidation resistance and good structural stability.
Standard:
GB/T9948——Seamless steel pipe for petroleum cracking
The main production of steel pipe grade:
10, 20, 15CrMo, 1Cr2Mo, 1Cr5Mo, etc.
Process flow
Hot rolling (extrusion seamless steel pipe): round tube billet → heating → perforation → three-roll cross-rolling, continuous rolling or extrusion → pipe removal → sizing (or reducing diameter) → cooling → blank tube → straightening → quality inspection Wall thickness → hydraulic test (or flaw detection) → mark → storage.
Cold drawn (rolled) seamless steel pipe: round tube billet → heating → perforation → head → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → blank tube → heat treatment → straightening → Quality inspection wall thickness → hydraulic pressure test (inspection) → marking → storage.
GB/T 9948 petroleum cracking pipe Quick Details
Type:Seamless Steel Pipe.
Material: Gr 10, Gr 20, 15CrMo, 1Cr2Mo, 1Cr5Mo
WT: 3.4-21mm.
OD: 34-508mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
FOB Price: US $400-1100 / Ton | 1 Ton/Tons (Min. Order)
Additional Info
Port of Shipment: Tianjin, China
Payment Terms:T / T, LC
Delivery: 7-15 days after payment
Surface: Tubes will be varnished (Outside only) to prevent rust.
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package:Standard export package,suit for all kinds of transport, or as required
Size tolerances for GB 9948 Seamless Steel Pipe
| Steel pipe | Outer diameter(OD) | Wall thickness(WT) | ||
| Cold drawn pipe | Outer diameter | Tolerance | Wall thickness(mm) | Tolerance |
| ＞30～50 | ±0.3 | ≤30 | ±10％ | |
| ＞50～219 | ±0.8％ | |||
| Hot rolled pipe | ＞219 | ±1.0％ | ＞20 | ±10％ |
Mechanical properties for GB 9948 Seamless Steel Pipe
| Standard | Gade | tensile strength (MPa) | yield strength (MPa) | elongation (%) | impact energy (J) | Brinell hardness (HB) | delivery status |
| GB/T9948 | 10 | 330～490 | ≥205 | ≥24 | / | / | Normalizing |
| 20 | 410～550 | ≥245 | ≥21 | ≥39 | / | Normalizing | |
| 15CrMo | 440～640 | ≥235 | ≥21 | ≥47 | ≤170 | Normalizing + tempering | |
| 1Cr2Mo | ≥390 | ≥175 | ≥22 | ≥92 | ≤179 | Normalizing + tempering | |
| 1Cr5Mo | ≥390 | ≥195 | ≥22 | ≥92 | ≤187 | annealing |
Chemical Composition for GB 9948 Seamless Steel Pipe
| Standard | Gade | Chemical composition(%) | |||||||
| C | Si | Mn | P | S | Cr | Mo | Ni | ||
| GB/T9948 | 10 | 0.07～0.14 | 0.17～0.37 | 0.35～0.65 | ≤0.035 | ≤0.035 | ≤0.15 | / | ≤0.25 |
| 20 | 0.17～0.24 | 0.17～0.37 | 0.35～0.65 | ≤0.035 | ≤0.035 | ≤0.25 | / | ≤0.25 | |
| 15CrMo | 0.12～0.18 | 0.17～0.37 | 0.40～0.70 | ≤0.035 | ≤0.035 | 0.80～1.10 | 0.40～0.55 | ≤0.30 | |
| 1Cr2Mo | ≤0.15 | 0.50～1.00 | 0.30～0.60 | ≤0.035 | ≤0.030 | 2.15～2.85 | 0.45～0.65 | / | |
| 1Cr5Mo | ≤0.15 | ≤0.50 | ≤0.60 | ≤0.035 | ≤0.030 | 4.00～6.00 | 0.45～0.60 | ≤0.60 | |
Manufacturing method:
1.General GB/T9948 seamless steel pipe use temperature below 450 ° C, domestic pipe is mainly made of 10, 20 carbon steel hot-rolled pipe or cold drawn pipe.
2.GB/T9948 seamless steel pipe is often used in high temperature and high pressure conditions, and the pipe will be oxidized and corroded under the action of high temperature flue gas and water vapor. Steel pipes are required to have high durability, high corrosion resistance and good structural stability.
Use:
1.General GB/T9948 seamless steel pipe is mainly used to manufacture water-cooled wall pipe, boiling water pipe, superheated steam pipe, superheated steam pipe for locomotive boiler, large and small pipe and arch brick pipe.
2.GB/T9948 seamless steel pipe is mainly used to manufacture superheater pipes, reheater pipes, air pipes, main steam pipes, etc. of high pressure and ultra high pressure boilers.
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