GB5310 12Cr1MoVG Seamless steel tubes
GB 5310 12Cr1MoVG Seamless steel tubes and pipes for high pressure boiler
12Cr1MoVG is a Cr-Mo-V low alloy heat-resistant steel introduced from the Soviet Union in the 1950s and 1960s. Vanadium is an element that reduces the y-phase region. When dissolved in y-fe, it will inhibit the transformation of ADI to pearlite, which is beneficial to the formation of ADI. The total amount of alloy in 12Cr1MoVG steel is only one half of that of 2.25Cr-1Mo steel, but the endurance strength (580 ° C) is 1.4 times of that of 2.25Cr-1Mo steel. Similar steel grades widely used abroad include ASTM a405 p24 in the United States, bs3604 in the United Kingdom, DIN 13crmov42 in Germany, etc.
GB 5310 12Cr1MoVG High Pressure Boiler Tubes Quick Details
- Manufacture:Seamless process ,Hot-finished or Cold-finished
- Wall thickness(WT): 2 mm--100 mm.
- Outer diameter (OD): 10 mm--711mm
- Length: 6M or specified length as required.
- Ends: Plain End, Beveled End, Treaded
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% |
- |
Heat treatment for GB 5310 12Cr1MoVG High Pressure Boiler Tubes
| Grade |
Heat treatment |
| 12Cr1MoVG |
980 ºC~1 020 ºC,Normalizing,980 °C ~ 1 020 °C normalizing, when the wall thickness is greater than 30 mm, forced cooling; 720 °C ~ 760 °C tempering. |
Chemical composition of GB 5310 12Cr1MoVG
| Grade |
Chemical Composition(%) |
| C |
Si |
Mn |
Cr |
Mo |
V |
Ni |
Cu |
P |
S |
| Max |
| 12Cr1MoVG |
0.08~0.15 |
0.17~0.37 |
0.40~0.70 |
0.90~1.20 |
0.25~0.35 |
0.15~0.30 |
≤0.30 |
≤0.20 |
0.025 |
0.020 |
Mechanical properties of GB 5310 12Cr1MoVG
| Steel Pipe |
Tensile properties |
Impact energy(Akv),J |
Tensile strength
(MPa) |
Yield Strength
(MPa) |
Elongation
% |
Portrait |
Landscape |
|
| Portrait |
Landscape |
| |
Max |
| 12Cr1MoVG |
470~640 |
255 |
21 |
19 |
40 |
27 |
The annual oxidation corrosion rate of 12Cr1MoVG steel in hot air is 0.042-0.050 mm / year at 580 ° C and 0.129-0.220 mm / year at 600 ° C.
Steel pipe delivery status(condition)
Steel pipe delivery status(condition): cold / hard (BK), cold / soft (BKW), after cold stress relief annealing (BKS), annealing (GBK), normalized (NBK).
Condition on delivery of steel pipe
| Term |
Symbol |
Explanation |
| Cold-finished/hard (cold-finished as-drawn) |
BK |
No heat treatment after the last cold-forming process. The tubes therefore have only low deformability. |
| Cold-finished/soft (lightly cold-worked) |
BKW |
After the last heat treatment there is a light finishing pass (cold drawing) With proper subsequent processing, the tube can be cold-formed (e.g. bent, expanded) within certain limits. |
| Annealed |
GBK |
After the final cold-forming process the tubes are annealed in a controlled atmosphere or under vacuum. |
| Normalized |
NBK |
The tubes are annealed above the upper transformation point in a controlled atmosphere or under vacuum. |
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