Super Alloy Sanicro 41 (UNS N08825)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Fabrication and Heat Treatment
     Machinability
     Forming
     Welding
     Heat Treatment
     Forging
     Hot Working
     Cold Working
Other Designations
Applications

Introduction

Sanicro 41 is an austenitic, corrosion resistant Ni-Fe-Cr alloy that is characterized by very good resistance to corrosion in acidic media and stress corrosion cracking. The alloy has good weldability and much better resistance to pitting and crevice corrosion.

The following datasheet will provide an overview of Sanicro 41 alloy.

Chemical Composition

The chemical composition of Sanicro 41 alloy is outlined in the following table.

Element Content (%)
Nickel, Ni 38.5
Iron, Fe 35.1
Chromium, Cr 20
Molybdenum, Mo 2.6
Copper, Cu 1.7
Manganese, Mn 0.8
Titanium, Ti 0.7
Silicon, Si ≤0.5
Carbon, C ≤0.03
Phosphorous, P ≤0.025
Sulfur, S ≤0.015

Physical Properties

The following table shows the physical properties of Sanicro 41 alloy.

Properties Metric Imperial
Density 8.10 g/cm3 0.293 lb/in3

Mechanical Properties

The mechanical properties of Sanciro 41 alloy are displayed in the following table.

Properties Metric Imperial
Tensile strength ≥517 MPa ≥75000 psi
Yield strength ≥172 MPa ≥24900 psi
Elongation at break ≥30% ≥30%

Thermal Properties

The thermal properties of Sanicro 41 alloy are given in the following table.

Properties Metric Imperial
Thermal expansion co-efficient (@30-100°C/86-212°F) 14.2 µm/m°C 7.89 µin/in°F
Thermal conductivity (@20°C/68°F) 11 W/mK 76.3 BTU.in/hrft².°F

Fabrication and Heat Treatment

Machinability

Conventional machining techniques that are used for machining iron-based alloys can be used.

Forming

Sanicro 41 alloy has excellent ductility, and can be readily formed by all conventional techniques.

Welding

The alloy can be welded using commonly used welding techniques such as gas-tungsten arc welding, shielded metal-arc welding, gas metal-arc welding and submerged-arc welding.

Heat Treatment

Sanicro 41 alloy can be heat treated at 954°C (1750°F) and then air cooled.

Forging

The alloy can be forged in the temperature range of 982 to 1093°C (1800 to 2000°F).

Hot Working

Hot working can be carried out at temperatures below 927°C (1700°F) to maintain optimum corrosion resistance of the alloy.

Cold Working

Cold working may be performed using standard tooling.

Other Designations

Other designations that are equivalent to Sanicro 41 alloy include the following:

ASTM B163 ASTM B564
ASTM B423 ASTM B704
ASTM B424 ASTM B705
ASTM B425 DIN 2.4858

Applications

The following are the list of applications of Sanicro 41 alloy:

  • Acid production piping and vessels
  • Pickling
  • Chemical process equipment.

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