During qualification of a next-generation ethylene cracking furnace, 25Cr stainless tubes suffered catastrophic carburization attack after only 9 months at 1080°C, forcing a $3.2M redesign. The proven solution was NiCr 20:25 Sheets – a chromium-rich 20Ni-25Cr resistance alloy forming an ultra-stable Cr₂O₃ protective scale that reduced carbon penetration by 89%, extended tube life beyond 36 months, and achieved 99.2% furnace availability across chemical, oil & gas, marine, pharma, and power generation applications.
Table of Contents
Engineered specifically for procurement heads, engineers, fabricators, and OEM manufacturers facing severe carburizing and oxidizing environments, NiCr 20:25 outperforms standard 25Cr stainless steels through higher chromium (25% vs 20-25%) and optimized nickel that delivers 8x slower carburization rates at 1100°C while maintaining excellent fabricability and weldability. Unlike Nimonic 75 optimized for aerospace creep strength, NiCr 20:25 targets industrial furnace service where oxidation scale stability determines component life.
Aurico Alloys LLP is your premier NiCr 20:25 Sheets supplier, stockist, and exporter in India to abroad, providing affordable, authentic ASTM B344-family certified material with NiCr 20:25 ready stock India, competitive NiCr 20:25 sheet price per kg, and precision NiCr 20:25 sheet cut to size services for chemical reformers, oil & gas pyrolysis furnaces, marine incinerators, pharma heat treatment kilns, and power generation waste heat boilers.
High-quality NiCr 20:25 Sheets ready for industrial use.
Specification Overview
| Supplier | Aurico Alloys LLP – NiCr 20:25 sheets supplier/export |
|---|---|
| Grade | NiCr 20:25 (20Ni-25Cr high-chromium resistance alloy) |
| Standards | ASTM B344 (resistance alloys), DIN 17742 |
| Thickness Range | 0.2-12mm (NiCr 20:25 sheet cut to size) |
| Max Service Temp | 1100°C carburizing/oxidizing |
| Key Feature | 89% reduced carburization vs 25Cr SS |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | — |
| Werkstoff / EN number | 1.4843 |
| Density | 7.80 g/cm3 |
Identifiers and physical constants for Nichrome 20/25. A dash means no such designation is published for this grade.
Stock & Product Availability
Aurico Alloys LLP maintains competitive NiCr 20:25 sheet price with NiCr 20:25 ready stock India optimized for reformer tube sheets and furnace radiant panels.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Nickel (Ni) | 18.0 | — |
| Manganese (Mn) | — | 1.0 |
| Iron (Fe) | — | Balance |
| Silicon (Si) | 1.0 | 1.5 |
| Chromium (Cr) | 23 | 27 |
| Carbon (C) | — | 0.10 |
| Aluminium (Al) | — | 0.30 |
| Copper (Cu) | — | 0.50 |
Composition limits for Nichrome 20/25. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 650-800 MPa |
| Yield Strength | 300-400 MPa |
| Elongation | ≥30% |
| Carburization 1100°C | 89% reduction vs SS |
| Scale Adhesion | Excellent |
Applications & Why Superior to Stainless
- Chemical: Ethylene furnace radiant tubes – 36+ month life vs 9 months SS
- Oil & Gas: Pyrolysis furnace tube sheets to 1100°C carburizing
- Marine: Incinerator combustion chambers resisting chlorides/sulfur
- Pharma: High-temperature validation kilns with stable oxide
- Power: Waste-to-energy boiler tubes, gasification reactors
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
NiCr 20:25 sheets from Aurico Alloys LLP deliver ASTM B344-certified chromium-rich performance with unmatched 1100°C carburization resistance and economic advantages over stainless steels for your most demanding reformer tubes, furnace panels, and pyrolysis equipment. Are your high-temperature carburizing applications protected by the 25Cr NiCr alloy that outperforms stainless alternatives by orders of magnitude?