Industrial plants facing carburising and scaling attack in hot furnace atmospheres have improved uptime and reliability by switching to NiCr 20:25 Round Bars. This chromium-rich nickel-chromium-iron alloy holds a stable oxide film in high-temperature service, making it a top choice across chemical, marine, oil & gas, pharma, and power generation sectors for furnace fixtures, element supports, and machined hot-zone parts.
Table of Contents:
NiCr 20:25 contains about 20% nickel and 25% chromium with the balance iron, plus small silicon and manganese additions. The high chromium content is what carries the alloy: it forms a tenacious chromia scale that resists oxidation and carburisation in furnace service far better than a 25Cr stainless. That makes it suitable for reformer and furnace internals, element supports, and process hardware subject to sustained heat and thermal cycling.
Stocked in diameters ranging from 6mm to 120mm, NiCr 20:25 round bars can be custom machined for OEMs and engineered solutions, with certified mill test reports and batch traceability on every consignment. Hardware suppliers and industrial fabricators widely prefer this alloy for its consistent supply and for the composition being confirmed lot by lot on the certificate.
As compared to NiCr 30:20 and 40:20, this alloy's higher chromium content offers superior scaling and carburisation resistance under sustained furnace heat key in maintaining plant safety and extending asset life.
High-quality NiCr 20:25 Round Bars ready for industrial use.
Specification Overview
| Grade | NiCr 20:25 (20Ni-25Cr nickel-chromium-iron resistance heating alloy) |
|---|---|
| Standards | No grade-specific standard verified for 20:25 — supplied to the mill programme in force at the time of enquiry, with the analysis stated on the mill test certificate |
| Diameter Range | 6mm – 120mm |
| Finish | Hot rolled, polished, custom cut |
| Delivery | Batch certified, mill test reports, export-ready packaging |
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.
Aurico Alloys LLP publishes an equivalence table only where a mill bulletin states one. No UNS, Werkstoff or ASTM designation has been verified for NiCr 20:25, so none is listed here; the material is supplied against the mill programme and certified on the mill test report.
Stock & Product Availability
NiCr 20:25 Round Bars are stocked to support chemical, marine, oil & gas, pharma, and power industries with rapid delivery and certified quality, essential for critical process plants and OEM fabrication centers.
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 & Physical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 310–370 |
| Yield Strength (MPa) | 140–160 |
| Elongation (%) | 35–40 |
| Service Temperature Max (°C) | 900 |
Applications & Benefits
- Chemical: reformer and cracking furnace internals, calciner fixtures, thermowell bodies
- Marine: incinerator combustion chamber hardware, hot-gas duct supports
- Oil & Gas: pyrolysis furnace hangers, heater-treater element supports
- Pharma: depyrogenation tunnel and validation kiln fixtures
- Power: waste-to-energy and gasifier hot-zone hardware, element terminals
- Hardware & Fabrication: machined furnace spares, urgent OEM hot-zone parts
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 Across India
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
NiCr 20:25 Round Bars provide dependable scaling resistance, machinability, and certified supply for chemical, marine, oil & gas, pharma, and power sectors. Are your critical process assets safeguarded with these chromium-rich nickel-chromium alloy bars?