15CrMoG Alloy steel pipe is a seamless steel tube, its performance is much higher than the general seamless steel pipe, because the inside of this tube contains CR more, its alloy steel tube high temperature, low-temperature, corrosion resistance of other seamless steel tubes, so the alloy tube in the petroleum, chemical, electric power, boiler and other industries are more widely used.
15CrMoG seamless tubes for high pressure boiler
The range of 15CrMoG pipe sizes that may be examined by each method shall be subjected to the limitations in the scope of the respective practice.
15CrMoG steel under GB 5310 standard is seamless steel pipe and tube for high pressure boilers, steam boilers, and pipe lines.
For high-pressure boiler (working pressure 9.8MPa or more generally, the working temperature between 450℃-650℃) of heating surface tubes, header, economizer, superheater, reheater and so on.
15CrMoG Seamless Tubes for High Pressure Boiler description
Standard: GB 5310
Relative grades:
- 20G, 20MnG, 15MoG, 15CrMoG, 12Cr2MoG, 12Cr1MoVG. After consultation, can also supply other grades of steel.
15CrMoG Alloy steel pipe is a seamless steel tube, its performance is much higher than the general seamless steel pipe, because the inside of this tube contains CR more, its alloy steel tube high temperature, low-temperature, corrosion resistance of other seamless steel tubes, so the alloy tube in the petroleum, chemical, electric power, boiler and other industries are more widely used.
Mechanical properties:
| Grade | Tensile strength(MPa) | Yield strength(MPa) | Elongation(%) | |
|---|---|---|---|---|
| Vertical | Longitudinal | |||
| 15CrMoG | 440-640 | 295 min. | 21 min. | 19 min. |
Chemical composition:
| C | Si | Mn | P | S | Cr | Mo |
|---|---|---|---|---|---|---|
| 0.12-0.18 | 0.17-0.37 | 0.40-0.70 | 0.025 max. | 0.015 max. | 0.80-1.10 | 0.40-0.55 |
15CrMoG seamless tubes heat treatment: Normalizing and tempering
- Normalizing temperature: 900 °C-960 °C
- Tempering temperature: 680 °C-730 °C
The W.T. tolerance of 15CrMoG：
| W.T.(S) | Tolerance of W.T. | |
|---|---|---|
| <3.5 | +15%(+0.48mm min) | |
| -10%(+0.32mm min) | ||
| 3.5-20 | +15%,-10% | |
| >20 | D<219 | ±10% |
| D≥219 | +12.5%,-10% | |
The principle of purifying hydrogen from 15CrMoG alloy steel tube is that, at 300-500 ℃, hydrogen is adsorbed on the side of the 15CrMoG alloy steel tube, and the hydrogen is absorbed on the 1515CrMoG alloy steel pipe wall, because of the lack of two electrons in the 4d electron layer of palladium, It can produce unstable chemical bonds with hydrogen (this reaction of palladium and hydrogen is reversible), under the action of Palladium, hydrogen is ionized to proton its radius is 1.5x1015m, and the lattice constant of palladium is 3.88x10-10m (20 ℃), so it can pass 15CrMoG alloy steel pipe, Under the action of Palladium, protons are combined with electrons to form hydrogen molecules, escaping from the other side of the 15CrMoG alloy steel tube.
Length: 5800mm; 6000mm; 6096mm; 7315mm; 11800mm; 12000mm; and so on.
Max length: 16000mm, also U bending can be offered.
PMI test:
PMI (Positive Material Identification) testing is the analysis of materials to determine the chemical composition of a metal or alloy at particular (usually multiple) steps of alloy manufacturing or in-process alloy installation.
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