Home> Welded Tubes > ASTM B515 B516 B626
Engineered for extreme corrosion, extreme temperature, and zero-failure environments
When stainless steels and even duplex alloys reach their performance limits, nickel-based alloys take over.
ASTM B515 / B516 / B626 welded tubes are specified for applications where materials must withstand highly corrosive acids, high chloride & seawater exposure, high-pressure & high-temperature service, oxidation, carburization & sulfidation, and long-term reliability in critical process plants.
INOX STEEL INDIA supplies project-grade nickel alloy welded tubes manufactured with strict metallurgical control, weld integrity, and documentation compliance.
These are welded tubes manufactured from nickel-based or nickel–iron–chromium alloys, designed for environments that are too aggressive for carbon steel, stainless steel, or even duplex alloys.
They are covered under:
Typical Grades: 600, 625, 601, 718
Typical Grades: 400, K500
Typical Grades: C22, C276
Typical Grades: 800, 800H, 800HT, 825
| Standard | Covers | Typical Use |
| ASTM B515 | General nickel alloy welded tubes | Chemical, marine, power |
| ASTM B516 | High-temp & pressure welded pipes | Boilers, heaters, furnaces |
| ASTM B626 | Ni–Cr–Mo / Ni–Fe–Cr alloys | Acid plants, offshore |
| OD Range | WT Range | Applications |
| 6 – 19 mm | 0.8 – 2.0 | Instrumentation |
| 19 – 38 mm | 1.0 – 3.0 | Heat exchangers |
| 38 – 60 mm | 1.5 – 5.0 | Process piping |
| 60 – 114 mm | 2.0 – 8.0 | Offshore skids |
| 114 – 610 mm | 3.0 – 12.0 | Critical pipelines |
Nickel alloys retain mechanical stability where stainless steels and duplex alloys soften or corrode aggressively, making them ideal for extreme service conditions.
| Alloy | INR/kg | USD/kg |
| Monel 400 | ₹1,200 – 2,100 | $15 – 26 |
| Inconel 625 | ₹2,200 – 3,800 | $27 – 46 |
| Hastelloy C22/C276 | ₹2,800 – 4,500 | $34 – 55 |
| Incoloy 825 | ₹1,600 – 2,800 | $20 – 34 |
Monel 400 or Inconel 625. Hastelloy C22 (or C276 for reducing environments). Yes—when manufactured with controlled heat input and NDT. INOX supplies project-approved welded tubes. Yes—BV, DNV, LR, TUV on request. Which alloy is best for seawater?
Which alloy handles mixed acids best?
Are welded nickel alloy tubes reliable for critical service?
Do you provide third-party inspection?