GB/T 5310 15CrMoG High Pressure Seamless Boiler Tubes
- GB/T 5310
- China
- Stock
- 15CrMoG
15CrMoG is GB 5310-95 steel grade (equivalent to 13CrMo44 of Federal Germany; corresponding to 1Cr-1 / 2Mo and 1 1 / 4cr-1 / 2mo-si steel widely used in various countries in the world)
GB/T 5310 15CrMoG High Pressure Seamless Boiler Tubes
GB 5310 15CrMoG High Pressure Boiler Tubes
Standard:GB 5310
Seamless steel tubes and pipes for high pressure boiler
GB 5310 standard is applicable to steam boilers and pipeline seamless pipes for the manufacture of high pressure and above.
15CrMoG is GB 5310-95 steel grade (equivalent to 13CrMo44 of Federal Germany; corresponding to 1Cr-1 / 2Mo and 1 1 / 4cr-1 / 2mo-si steel widely used in various countries in the world). Its chromium content is higher than 12CrMo steel, so it has higher thermal strength at 500-550 ℃. When the temperature is higher than 550 ℃, the thermal strength of 15CrMoG steel is significantly reduced. When it runs at 500-550ec for a long time, it does not produce graphitization, but it will produce carbide spheroidization and redistribution of alloy elements, which all lead to the decrease of the thermal strength of steel. 15CrMoG steel has good relaxation resistance at 450 ℃. Its pipe making and welding process performance is good.
GB 5310 15CrMoG Seamless steel tubes and pipes for high pressure boiler
Application
Maximum service temperature: it is applied to high and medium pressure boiler steam pipes, headers, superheater pipes with wall temperature of 540 ° C, forgings and elastic elements with steam parameters of 510ec.
GB 5310 15CrMoG High Pressure Boiler Tubes Quick Details
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 2.8 mm——150 mm.
Outer diameter (OD): 23 mm——1500 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Treaded
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: Bundles (hexagonal),Wooden Boxes,Crates (steel/wooden) or as required
Manufacturing methods
(1)Steel smelting method
GB 5310 15CrMoG steel will be smelted by electric furnace plus furnace refining, oxygen converter plus furnace refining or electroslag remelting method.
(2)Manufacturing methods and requirements for tube blanks
The tube blank can be produced by continuous casting, die casting or hot rolling (forging).
(3)Manufacturing method of steel tube
GB 5310 15CrMoG Steel tubes shall be manufactured by hot rolling (extrusion, expansion) or cold drawing (rolling).
Classification, code
a) Hot rolled steel pipe, codenamed WH;
b) Cold drawn steel pipe, codenamed WC.
Delivery status
The steel tubes shall be delivered in a heat treated condition.
Heat treatment for GB 5310 15CrMoG High Pressure Boiler Tubes
| Grade | Heat treatment |
| 15CrMoG | 900 ℃～960 ℃,Normalizing；660 ℃～730 ℃,Tempering |
Chemical composition of GB 5310 15CrMoG
| Steel Pipe | Chemical Composition(%) | ||||||||
| C | Si | Mn | Cr | Mo | Ni | Cu | P | S | |
| Max | |||||||||
| 15CrMoG | 0.12～0.18 | 0.17～0.37 | 0.40～0.70 | 0.80～1.10 | 0.40～0.55 | ≤0.30 | ≤0.20 | 0.025 | 0.020 |
Mechanical properties of GB 5310 15CrMoG
| Tensile properties | Impact energy(Akv)，J | Hardness | |||||||
|
Tensile strength (MPa) |
Yield Strength (MPa) |
Elongation % |
Portrait | Landscape | A | B | C | ||
| HBW | HV | HRC | |||||||
| Portrait | Landscape | ||||||||
| Max | Min | ||||||||
| 440～640 | 235 | 21 | 19 | 40 | 27 | 170 | 180 | 88HRB | |
Allowable deviation of outer diameter and wall thickness
| Type of steel pipe | Outer diameter(mm) | Tolerance | |||
| ordinary | advanced | ||||
| Hot rolled tube | OD | ≤50 | ±0.40 | ±0.30 | |
| ＞50～≤325 | WT≤35 | ±0.75% | ±0.5% | ||
| WT＞35 | ±1% | ±0.75% | |||
| ＞325 | ±1% | ±0.75% | |||
| WT | ≤4.0 | ±0.4 | ±0.3 | ||
| ＞4.0～≤20 | ±10% | ±7.5% | |||
| ＞20 | OD＜219 | ±10% | ±7.5% | ||
| OD≥219 |
+12.5% -10% |
±10% | |||
| Cold drawn tube | OD | ≤25.4 | ±0.15 | — |
| ＞25.4～≤40 | ±0.20 | — | ||
| ＞40～≤50 | ±0.25 | — | ||
| ＞50～≤60 | ±0.30 | — | ||
| ＞60 | ±0.5% | — | ||
| WT | ≤2.8 | ±0.2 | — | |
| ＞2.8 | ±7.5% | — |
Testings
(1)Hydraulic test
The steel pipe shall be hydraulically tested one by one, and the eddy current testing can instead of the hydraulic test.
(2)Flattening test
Steel pipes with an outer diameter greater than 22 mm to 400 mm and a wall thickness not greater than 40 mm shall be subjected to a flattening test.
(3)Bending test
Steel pipes with an outer diameter greater than 400 mm or a wall
(4)Flaring test
The steel pipe with an outer diameter of not more than 76 mm and a wall thickness of not more than 8 mm can be used for the flare test.
(5)Low-power test
Steel pipes should be tested at low magnification. Visually visible white spots, inclusions, subcutaneous bubbles, tumbling and delamination are not allowed on the cross-section acid immersion test piece.
(6) Non-metallic inclusions
Steel pipes shall be tested for non-metallic inclusions.
(7)grain size
The finished steel pipe should be tested for grain size.
(8)Microstructure
The finished steel pipe with the grades 15CrMoG will be ferrite plus pearlite, allowing the presence of granular bainite, and no phase change critical temperature between AC1 and AC3 is allowed.
(9)Decarburization layer
Cold drawn (rolled) finished steel pipes with an outer diameter of not more than 76 mm shall be inspected for the total decarburization layer.
(10)Non-destructive testing
The steel pipe shall be ultrasonically inspected and tested in accordance with the provisions of GB/T 5777.
Surface quality
The inner and outer surfaces of steel pipes do not have cracks, folds, crusting, rolling and separation. These defects shall be completely removed and the depth of defect removal shall not exceed 10% of the wall thickness. The actual outer diameter and wall thickness of the defect removal shall not be less than the minimum allowable for the outer diameter and wall thickness.
End shape
The end faces of the steel pipe should be perpendicular to the axis of the steel pipe, and the incision burrs swill be removed.
Packaging, marking and quality instructions
The packaging, marking and quality specifications of steel pipes shall comply with the provisions of GB/T 2102.
Selection principle of 15CrMoG welding material angle
E5515-b2 (heat 307) electrode is used for manual welding.
H12crmo or h15crmo welding wire is used for gas welding, and h15crmo welding wire and flux 250 are used for automatic welding.
Photos of GB 5310 15CrMoG High Pressure Boiler Tubes
Ordering content
Contracts or orders for ordering steel pipes include the following:
a) standard numbe:GB 5310r;
b) product name:Seamless steel tubes;
c)Grade :15CrMoG;
d) the quantity ordered (total weight or total length);
e) Dimensions (outer diameter × specified minimum wall thickness or outer diameter × average wall thickness in millimeters);
f) Special requirements.
GB 5310 15CrMoG Equivalent grade
| Standard | GB5310 | ASTM A335 | ASTM A213 | JIS G3462 | JIS G3458 | DIN 17175 |
| Grade | 15CrMoG | P12 | T12 | STBA22 | STPA22 |
13CrMo44 |
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