GB/T 5310 12Cr1MoVG High Pressure Seamless Boiler Tube
GB/T5310 12Cr1MoVG High Pressure Boiler Tube.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.
Description
GB5310 12Cr1MoVG High Pressure Boiler Tube
Standard:GB 5310
GB 5310 12Cr1MoVG is applicable to seamless tubes for making steam boiler whose pressure is high or higher and seamless tubes used as pipelines.
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.
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.
GB5310 12Cr1MoVG high pressure boiler tube Specification
Type：Seamless Steel Pipe.
Material：12Cr1MoVG.
WT：5-200mm.
OD：10-1500mm
Length：6M or specified length as required.
Ends：Plain End、Beveled End、Treaded
Heat treatment:
980 ℃～1 020 ℃,Normalizing，980 °C ~ 1 020 °C normalizing, when the wall thickness is greater than 30 mm, forced cooling; 720 °C ~ 760 °C tempering.
980 ℃～1 020 ℃,Normalizing，980 °C ~ 1 020 °C normalizing, when the wall thickness is greater than 30 mm, forced cooling; 720 °C ~ 760 °C tempering.
GB5310 12Cr1MoVG high pressure boiler tube Chemical Composition
| Grade | C | Si | Mn | P | S | Cr | Mo | Cu | Ni | V |
| 12Cr1MoVG | 0.18～0.24 | 0.17-0.37 | 0.40～0.70 | ≤0.03 | ≤0.03 | 0.90～1.20 | 0.25～0.35 | ≤0.20 | ≤0.30 | 0.15～0.30 |
GB5310 12Cr1MoVG high pressure boiler tube Mechanical property
| Standard | grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | Hardness(HB) | ||||
| GB5310 | 12Cr1MoVG | 470～640 | ≥255 | ≥ 21 | / | ||||
Application
Limit service temperature: gb5310 12Cr1MoVG alloy steel seamless steel pipe is mainly used for boiler superheater, reheater and other heating surface piping systems with metal wall temperature not exceeding 580 ° C, boiler header and main steam pipe and other pressure parts with metal wall temperature not exceeding 565 ° C.
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% | — | |||
Allowable Tolerance of the minimum wall thickness specified in the steel pipe
| Type of steel pipe | Wall thickness range | Tolerance | |
| ordinary | advanced | ||
| Hot rolled tube | WTmin≤4.0 | +0.8 O |
+0.6 O |
| WTmin＞4.0 | +20%S 0 |
+15%S 0 |
|
| Cold drawn tube | WTmin≤2.8 | +0.4 O |
— |
| WTmin＞2.8 | +15%S 0 |
— | |