12Cr2MoWVTiB boiler tube is a low-alloy bainitic heat-resistant steel. It mainly uses tungsten-molybdenum composite solid solution strengthening, vanadium-titanium composite dispersion strengthening and trace boron hardening. The steel has excellent comprehensive properties under working conditions less than 600 °C. Mechanical properties, antioxidant properties and tissue stability.
12Cr2MoWVTiB seamless boiler tube This steel type has good thermal strength at 620°C, even reaching the level of some chromium-nickel austenitic steels, but its oxidation resistance drops sharply, and its weight gain per unit area in 3000h is 242g/m2 , the corrosion rate is 0. 15mm/year.
12Cr2MoWvTiB seamless steel pipe for high-pressure boilers is mainly used to manufacture high-pressure pipes, containers, flanges, valves and other components in high-pressure boilers, petrochemical industry, nuclear power and other fields.
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Product specifications; outer diameter 57mm~762mm, wall thickness 3.0mm~140mm
Production method: hot rolling, delivery status: heat treatment: normalizing at 1000℃~1035℃, tempering at 760℃~790℃.
Chemical composition of 12Cr2MoWVTiB seamless steel pipe:
carbon: 0.08~0.15, silicon: 0.45~0.75, manganese: 0.45~0.65, chromium: 1.60~2.10, molybdenum: 0.50~0.65, vanadium: 0.28~0.42, titanium 0.08~0.18, boron: 0.002~0.008, Nickel: ≤0.30, Copper: ≤0.20, Tungsten: 0.30~0.55, Phosphorus: no more than 0.025, Sulfur: no more than 0.20.
Mechanical properties of GB/T 5610 12Cr2MoWVTiB steel pipe
| Grade | Tensile strength(MPa) | Yield strength(MPa) | Elongation | Hardness |
| 12Cr2MoWVTiB | 540-735 | ≥345 | ≥18% | --- |
GB 5310 Seamless Boiler Pipe Specification
The theoretical weight per meter of 12Cr2MoWVTiB alloy pipe (the density of steel is 7.85kg/dm3) calculation formula:
W=0.02466(D-S)S
In the formula: W--Theoretical weight of steel pipe per meter, kg/m;
D--Nominal outer diameter of steel pipe, mm;
S--Nominal wall thickness of steel pipe, mm.
Non-destructive inspection
Steel pipes should be subjected to ultrasonic flaw detection one by one in accordance with the provisions of GB/T5777. The longitudinal groove depth grade of the comparison sample pipe for ultrasonic flaw detection inspection is C5. According to the requirements of the buyer, other non-destructive inspections can be added after negotiation between the supplier and the buyer and stated in the contract.
Tensile test specimen
For steel pipes with an outer diameter less than 219 mm, the tensile test shall be conducted along the longitudinal direction of the steel pipe. For steel pipes with an outer diameter of not less than 219 mm, when the steel pipe size allows, the tensile test shall be conducted along the transverse direction of the steel pipe. When the steel pipe size is not sufficient to conduct the circular cross-section test, the tensile test shall be conducted along the longitudinal direction of the steel pipe. sampling.
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3.Q.Do you have quality control?
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