Jiangsu Cheonny Overlay Co., Ltd.
Jiangsu Cheonny Overlay Co., Ltd.
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ASME Standard Inconel 625 Cladding Boiler membrane wall panel/ water wall panel
Production Information
Inconel 625 is a high strength material with extremely high corrosion resistance and oxidation resistance. Therefore, can be competent for aerospace and chemical processing industry. This super alloy has high mechanical strength and hardness at low temperatures of about 2000oF / 1093oC. The alloy has excellent resistance to chloride ion stress corrosion cracking. It is nonmagnetic in nature. Due to its toughness, alloy 625 is suitable for degrading chloride ions.
The excellent corrosion resistance of Inconel 625 is due to the presence of molybdenum, niobium and refractory metal solution. The presence of nickel and chromium in Inconel 625 provides excellent oxidation resistance. Nickel and molybdenum prevent non-oxidative erosion, while niobium stabilizes the alloy to prevent sensitization during welding.
Inconel overlay thickness must maintain a minimum thickness of 0.070". To maintain surface smoothness the cross-sectional inconel thickness minimum and maximum delta shall not be greater than 0.020". The use of a permascope every 100 linear feet (approximately every 5th tube) shall be utilized to monitor overlay thickness. All thickness measurements shall be recorded and submitted to Covanta with final documentation. If test results indicate less than 0.070" overlay thickness and a greater than 0.020" delta between minimum and maximum thickness, the supplier shall take the appropriate additional testing, monitoring and production measures necessary to assure that the thickness and surface smoothness is maintained in the desired range and that any deviations shall be minor in magnitude and minimum in frequency.
| Component | Non-clad steel | Steel clad with Alloy 625 |
| Membrane wall in combustion room – lower area | 6-9 months | 3-4 years |
| Membrane wall in combustion room – higher area | 2 years | > 8 years |
| Reheater | 3-4 years | > 4 years |
| Base material | » Pipe walls and single tubes in P235GH, 15Mo3, 13CrMo44, 10CrMo910 |
| Welding materials | » Alloy 622 (US), alloy 625, alloy 686 (super heater tubes) galvanizing |
| Shielding gas | » 4-component shielding gas: He = 32 %, H2 = 2 %, CO2 = 0.05 %, remainder Ar » Alternative choices of shielding gas |
| Welding equipment | » GMAweldingequipmentwithpulsed-currentpowersources » Automatic burner processing |
| Welding position | » Vertical down position preferred, layer width 15 - 20 mm |
| Option for application | » On-site in the boiler with mobile welding equipment, minimum wall thickness 3 mm » Welding in the workshop weld metal overlay on new pipe walls and single tubes |
| Technical requirements |
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The most common problem in surfacing is cracking. The main methods to prevent cracking are as follows
1. Preheat before welding, control interlayer temperature and slow cooling after welding
2. Stress relief heat treatment after welding
3. Avoid multi-layer surfacing and use low hydrogen surfacing electrode
4. If necessary, build up the transition layer between the surfacing layer and the base metal (use the electrode with low carbon equivalent and high toughness)
Attention must be paid to butt welding:
1. According to the use requirements, reasonable selection of surfacing alloy
2. Reduce the dilution ratio of base metal as much as possible
3. Improve productivity
4. It is expected that the hardfacing metal and base metal have similar expansion coefficient and phase transformation temperature
Purpose of Inconel Cladding on surface :
1. Extend service life
2. Reduce costs
3. Reduce spare parts
4. Reduce maintenance
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A: We are manufacturer
A: Generally 5-10 days if the goods are in stock. or 25-35days if the goods are not in stock, it is according to quantity.
A: Yes, we could offer the sample extra
A: Payment<=1000USD, 100% in advance. Payment>=1000USD, 30% T/T in advance ,balance before shippment.
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