Alloy 602CA, 2.4633, UNS N06025 - nickel alloy according to ASTM B462, DIN 17752 etc.
Table of contents:
| Standard | Grade | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chemical composition % | ||||||||||||||
| Ni: | Cr: | Fe: | Al: | Ti: | Y: | Zr: | C: | Mn: | Si: | Cu: | P: | S: | Comments: | |
| ASTM / UNS | Alloy 602CA / UNS N06025 | |||||||||||||
| Balance | 24.0-26.0 | 8.0-11.0 | 1.8-2.4 | 0.1-0.2 | 0.05-0.12 | 0.01-0.1 | 0.15-0.25 | <0.15 | <0.5 | <0.1 | <0.02 | <0.01 | - | |
| DIN | 2.4633 / NiCr25FeAlY | |||||||||||||
| Balance | 24.0-26.0 | 8.0-11.0 | 1.8-2.4 | 0.1-0.2 | 0.05-0.12 | 0.01-0.1 | 0.15-0.25 | <0.5 | <0.5 | <0.1 | <0.02 | <0.01 | - | |
| ISO | NiCr25Fe10AlY / Ni6025 | |||||||||||||
| Balance | 24.0-26.0 | 8.0-11.0 | 1.5-2.2 | <0.4 | <0.15 | - | 0.10-0.25 | <0.5 | <1.0 | - | - | - | OT<0.5 | |
| ISO | BNI6025 | |||||||||||||
| >59.0 | 24.0-26.0 | 8.0-11.0 | 1.8-2.4 | 0.1-0.2 | 0.05-0.12 | 0.01-0.1 | 0.15-0.25 | <0.5 | <0.5 | <0.1 | <0.02 | <0.015 | Ni:Ni+Co; ET<0.5 | |
| ISO | ENi6025 | |||||||||||||
| >55.0 | 24.0-26.0 | 8.0-11.0 | 1.5-2.2 | <0.3 | <0.15 | - | 0.1-0.25 | <0.5 | <0.8 | - | <0.02 | <0.015 | ET<0.5; Ni:Ni+Co | |
| ISO | BNi6025 | |||||||||||||
| >59.0 | 24.0-26.0 | 8.0-11.0 | 1.8-2.4 | 0.1-0.2 | 0.05-0.12 | 0.01-0.1 | 0.15-0.25 | <0.5 | <0.5 | <0.1 | <0.02 | <0.01 | ET<0.5; Co<1.0; Ni:Ni+Co | |
| ASTM / UNS | Alloy 603GT / UNS N06603 | |||||||||||||
| Balance | 24.0-26.0 | 8.0-11.0 | 2.4-3.0 | 0.1-0.25 | 0.01-0.15 | 0.01-0.1 | 0.15-0.25 | <0.15 | <0.5 | <0.1 | <0.02 | <0.01 | - | |
| VDM® Metal | Nicrofer® 6025 HT | |||||||||||||
| Balance | 24.0-26.0 | 8.0-11.0 | 1.8-2.4 | 0.1-0.2 | 0.05-0.12 | 0.01-0.1 | 0.15-0.25 | <0.5 | <0.5 | <0.1 | <0.02 | <0.01 | - | |
Alloy 602CA, 2.4633, UNS N06025 – description
Alloy 602 CA is a Ni-Cr alloy with aluminum alloying addition, stabilized by yttrium and zirconium. It has great resistance to oxidizing atmospheres, high-temperature strength, and creep properties. Approved for pressure containers operating up to 899°C (according to ASME Code Section I), 980°C (for applications according to section VIII Div. I.), and up to 1150°C (according to VdTUV material data sheet).
Applications
Alloy 602 CA is used in thermotechnical processing (kiln rollers, furnace muffles) chemical processing (hydrogen production), in power plants and in the automotive industry (glow plugs for diesel engines, exhaust systems).
Physical and mechanical properties
Room temperature physical properties:
- Density: 7.93 g/cm3
- Melting temperature: 1340-1400 °C
- Magnetic permeability: 1.01
High-temperature Coefficient of thermal expansion, from 20°C to:
- 100°C: 14.15 μm/m⋅K
- 200°C: 14.27 μm/m⋅K
- 300°C: 14.42 μm/m⋅K
- 400°C: 14.63 μm/m⋅K
- 500°C: 14.9 μm/m⋅K
- 600°C: 15.0 μm/m⋅K
- 700°C: 15.18 μm/m⋅K
- 800°C: 16.0 μm/m⋅K
- 900°C: 16.71 μm/m⋅K
- 1000°C: 17.31 μm/m⋅K
- 1100°C: 17.91 μm/m⋅K
Electrical resistivity:
- 20°C: 1.23 μΩ·m
- 100°C: 1.25 μΩ·m
- 200°C: 1.26 μΩ·m
- 300°C: 1.28 μΩ·m
- 400°C: 1.29 μΩ·m
- 500°C: 1.31 μΩ·m
- 600°C: 1.33 μΩ·m
- 700°C: 1.32 μΩ·m
- 800°C: 1.31 μΩ·m
- 900°C: 1.31 μΩ·m
- 1000°C: 1.32 μΩ·m
Thermal conductivity:
- 20°C: 10.4 W/m · K
- 100°C: 12.3 W/m · K
- 200°C: 14.0 W/m · K
- 300°C: 15.5 W/m · K
- 400°C: 16.9 W/m · K
- 500°C: 18.4 W/m · K
- 600°C: 20.1 W/m · K
- 700°C: 22.0 W/m · K
- 800°C: 24.1 W/m · K
- 900°C: 26.2 W/m · K
- 1000°C: 28.2 W/m · K
- 1100°C: 29.7 W/m · K
- 1200°C: 30.6 W/m · K
Specific heat capacity:
- 20°C: 447 J/kg⋅K
- 100°C: 465 J/kg⋅K
- 200°C: 488 J/kg⋅K
- 300°C: 501 J/kg⋅K
- 400°C: 514 J/kg⋅K
- 500°C: 516 J/kg⋅K
- 600°C: 517 J/kg⋅K
- 700°C: 550 J/kg⋅K
- 800°C: 583 J/kg⋅K
- 900°C: 603 J/kg⋅K
- 1000°C: 626 J/kg⋅K
- 1100°C: 631 J/kg⋅K
- 1200°C: 636 J/kg⋅K
Tensile modulus:
- 20°C: 215 GPa
- 100°C: 209 GPa
- 200°C: 201 GPa
- 300°C: 197 GPa
- 400°C: 192 GPa
- 500°C: 189 GPa
- 600°C: 185 GPa
- 700°C: 169 GPa
- 800°C: 154 GPa
- 900°C: 137 GPa
- 1000°C: 118 GPa
- 1100°C: 102 GPa
Tensile properties of alloy 2.4633 rods after tempering designated as F65 according to DIN 17752:2019:
- Yield strength: >270 MPa
- Tensile strength: >650 MPa
- Elongation: >30 %
Tensile properties of alloy 2.4633 plates after tempering designated as F68 according to DIN 17750:2021:
- Yield strength: >270 MPa
- Tensile strength: >680 MPa
- Elongation: >30 %
High-temperature tensile properties for VDM® Alloy 602 CA solutioned at 1220°C, according to the producer:
Creep resistance of solutioned VDM® Alloy 602 CA - approximate initiall stress to produce 0,5% creep in given time and at given temperature:
Rupture strength of VDM® Alloy 602 CA - approximate initiall stress to produce a rupture in given time and at given temperature:
- 20°C:
- Yield strength: >270 MPa
- Tensile strength: >675 MPa
- 300°C:
- Yield strength: >200 MPa
- Tensile strength: >600 MPa
- 500°C:
- Yield strength: >180 MPa
- Tensile strength: >560 MPa
- 600°C:
- Yield strength: >175 MPa
- Tensile strength: >520 MPa
- 700°C:
- Yield strength: >170 MPa
- Tensile strength: >420 MPa
- 650°C, 10 000h: 185 MPa
- 650°C, 100 000h: 120 MPa
- 700°C, 10 000h: 132 MPa
- 700°C, 100 000h: 85 MPa
- 750°C, 10 000h: 75 MPa
- 750°C, 100 000h: 45 MPa
- 800°C, 10 000h: 32 MPa
- 800°C, 100 000h: 16,5 MPa
- 850°C, 10 000h: 19 MPa
- 850°C, 100 000h: 9,7 MPa
- 900°C, 10 000h: 13 MPa
- 900°C, 100 000h: 7,5 MPa
- 950°C, 10 000h: 8,8 MPa
- 950°C, 100 000h: 5,4 MPa
- 1000°C, 10 000h: 5,8 MPa
- 1000°C, 100 000h: 3,4 MPa
- 1050°C, 10 000h: 3,6 MPa
- 1050°C, 100 000h: 1,9 MPa
- 1100°C, 10 000h: 2,2 MPa
- 1100°C, 100 000h: 1 MPa
- 1150°C, 10 000h: 1 MPa
- 1150°C, 100 000h: 0,4 MPa
- 650°C, 10 000h: 215 MPa
- 650°C, 100 000h: 140 MPa
- 700°C, 10 000h: 155 MPa
- 700°C, 100 000h: 100 MPa
- 750°C, 10 000h: 90 MPa
- 750°C, 100 000h: 48 MPa
- 800°C, 10 000h: 42 MPa
- 800°C, 100 000h: 20 MPa
- 850°C, 10 000h: 26 MPa
- 850°C, 100 000h: 14 MPa
- 900°C, 10 000h: 18 MPa
- 900°C, 100 000h: 9,7 MPa
- 950°C, 10 000h: 12,8 MPa
- 950°C, 100 000h: 6,7 MPa
- 1000°C, 10 000h: 9 MPa
- 1000°C, 100 000h: 4,5 MPa
- 1050°C, 10 000h: 6,2 MPa
- 1050°C, 100 000h: 3,1 MPa
- 1100°C, 10 000h: 4,4 MPa
- 1100°C, 100 000h: 2,1 MPa
- 1150°C, 10 000h: 3 MPa
- 1150°C, 100 000h: 1,4 MPa
- 1150°C, 10 000h: 2,2 MPa
- 1150°C, 100 000h: 0,8 MPa
Corrosion behaviour
Very good oxidation resistance up to 1200°C, thanks to protective alumina scale. Very good resistance to high-temperature sulphidation and good resistance to carburization, provided that even traceable amount of oxidizing elements are present to facilitate forming of aluminum oxide scale.
Weldability
Fair weldability. If welded components are to be used at temperatures between 600-750°C, postweld heat treatment is recommended. Preheating is usually not required.
Selection of welding consumables for Alloy 602 CA
- Coated electrodes: ENiCrWMo-1
- Filler metals: ERNiCrFe-12 (AWS) / SNi6025 (DIN/ISO)
Heat treatment, working and machining
Recommended working and heat treatment parameters:
- Hot working: 1200-900 °C; rapid air cool / water quench
- Solution-treatment: 1220 °C; air cool / water quench
- Stabilizing anneal: 950 °C; 3h; air cool
The part should be solutioned after hot working and in case of cold forming above 7%. If solution annealing is the last step of processing before use, cooling can be carried out more slowly in air, otherwise quench in water. If permanent deployment is to take place in the temperature range of 600-750°C, stabilizing anneal is required.
We deliver this steel alloy as:
- Rod, bar, wire, forging according to DIN 17752, ISO 286, ASTM B 166 / ASME SB-166
- Plates, strips and sheets according to DIN 17750, ASTM B 168 / ASME SB-168
Replacements, equivalents and other designations:
Alloy 602CA, 2.4633, NiCr25FeAlY, 2.4649, BNi6025, ENI6025, Ni6025, NiCr25Fe10AlY, SNi6025, Alloy 603GT, Nicrofer® 6025 HT, Ra 602 CA Rolled Alloys, ASTM B 163 (N06025) / ASME SB-163 (N06025), ASTM B 166 (N06025) / ASME SB-166 (N06025), ASTM B 167 (N06025) / ASME SB-167 (N06025), ASTM B 168 (N06025) / ASME SB-168 (N06025), ASTM B 366 (CRV602) / ASME SB-366 (CRV602), ASTM B 366 (WPV602) / ASME SB-366 (WPV602), ASTM B 462 (N06025) / ASME SB-462 (N06025), ASTM B 472 (N06025) / ASME SB-472 (N06025), ASTM B 516 (N06025) / ASME SB-516 (N06025), ASTM B 517 (N06025) / ASME SB-517 (N06025), ASTM B 564 (N06025) / ASME SB-564 (N06025)