NiCr Alloy Cr20Ni30 Nickel-Chromium-Iron Alloys for High-Performance Electrical Applications
Cr20Ni30 is a high-temperature resistant alloy, known for its excellent mechanical properties and resistance to oxidation and corrosion. Composed of approximately 20% chromium and 30% nickel, this alloy offers a balance of strength, ductility, and thermal stability. It is widely used in applications that demand high-temperature endurance and resistance to corrosive environments, such as in the chemical, aerospace, and power generation industries. The alloy's high chromium content provides excellent oxidation resistance, while the nickel content ensures good ductility and strength at elevated temperatures. Cr20Ni30 is also valued for its ability to maintain structural integrity under thermal cycling, making it suitable for components in heat exchangers, furnace parts, and other equipment subjected to frequent temperature changes. Its combination of properties positions Cr20Ni30 as a versatile material for high-performance applications where both temperature resistance and corrosion resistance are critical.
|
Chemical Composition Wt.%
Cr20Ni30
|
% |
Ni |
Fe |
C |
Si |
Mn |
P |
S |
Cr |
| Min |
30 |
|
|
1 |
|
|
|
18 |
| Max |
34 |
Bal. |
0.08 |
3 |
1 |
0.02 |
0.015 |
21 |
Main characteristics of Ni-Cr and Ni-Cr-Fe electric heating alloys
|
Type
Performance
|
Cr30Ni70 |
Cr15Ni60 |
Cr20Ni35 |
Cr20Ni80 |
Cr20Ni30 |
Cr25Ni20 |
| Main Chemical composition |
Ni |
Rest |
55.0-61.0 |
34.0-37.0 |
Rest |
30.0-34.0 |
19.0-22.0 |
| Cr |
28.0-31.0 |
15.0-18.0 |
18.0-21.0 |
20.0-23.0 |
18.0-21.0 |
24.0-26.0 |
| Fe |
≤ 1.0 |
Rest |
Rest |
≤ 1.0 |
Rest |
Rest |
| Max. continuous service temp. of element (℃) |
1250 |
1150 |
1100 |
1200 |
1100 |
1050 |
| Resistivity at 20 ℃(μΩm) |
1.18±0.05 |
1.12±0.05 |
1.04±0.05 |
1.09±0.05 |
1.06±0.05 |
0.95±0.05 |
| Density(g/cm3) |
8.10 |
8.20 |
7.90 |
8.40 |
7.90 |
7.15 |
| Thermal condyctivity (KJ/m·h·℃) |
45.2 |
45.2 |
43.8 |
60.3 |
43.8 |
43.8 |
| Coefficient of lines expansion (α×10-6/℃) |
17.0 |
17.0 |
19.0 |
18.0 |
19.0 |
19.0 |
| Melting point (approx.)(℃) |
1380 |
1390 |
1390 |
1400 |
1390 |
1400 |
| Elonation at rupture(%) |
＞20 |
＞20 |
＞20 |
＞20 |
＞20 |
＞20 |
| Micrographic structure |
Austenite |
Austenite |
Austenite |
Austenite |
Austenite |
Austenite |
| Magnetic properties |
Non-magnetic |
Low-magnetic |
Low-magnetic |
Non-magnetic |
Low-magnetic |
Non-magnetic |
| Note:The various grades of electric resistance alloy material are blended with the amountof rare earth, titanium and other trace elements, to improve the processing performance andextend the period of the uselife. |
| Mechanical properties |
Condition |
Tensile Strength (UTS)(Rm) |
Elongation(A5) |
| D>3, T>0.2 |
≥600 MPa |
≥25% |
| 0.1<D<0.3, T>0.2 |
≥600 MPa |
≥20% |
Some key features of Cr20Ni30 include:
1. High-Temperature Resistance:
- Cr20Ni30 excels in high-temperature environments, offering strong resistance to oxidation and thermal scaling, making it suitable for use in furnaces, gas turbines, and heat exchangers.
2. Corrosion Resistance:
- The alloy provides excellent resistance to corrosion in both acidic and alkaline environments, making it ideal for chemical reactors, marine applications, and industrial incinerators.
3. Austenitic Structure:
- Cr20Ni30 has an austenitic (face-centered cubic) microstructure, which ensures excellent mechanical properties like toughness, strength, and good formability. It is also non-magnetic.
4. Weldability:
- The alloy offers good weldability, allowing it to be easily fabricated into complex components for various industrial applications.
5. Stress Corrosion Cracking Resistance:
- Cr20Ni30 has strong resistance to stress corrosion cracking, especially in chloride and other corrosive environments.
6. Thermal Cycling Resistance:
- The alloy performs well under thermal cycling, maintaining its mechanical properties during temperature fluctuations.
Applications:
1. Heat Exchangers
- Used in both industrial and power plant heat exchangers due to its ability to resist oxidation and corrosion at high temperatures.
2. Gas Turbines
- Ideal for turbine components exposed to high heat, such as blades, nozzles, and combustion chambers, where high strength and resistance to thermal cycling are required.
3. Furnace Parts
- Cr20Ni30 is commonly used in furnace components, such as burners and structural parts, due to its resistance to oxidation and its ability to withstand high temperatures.
4. Chemical Reactors
- Used in the construction of reactors in chemical processing industries where resistance to both high temperatures and corrosive substances is critical.
5. Boiler Components
- In power plants, Cr20Ni30 is used in boiler components that require resistance to high temperatures and mechanical stresses.
6. Marine Applications
- Due to its excellent resistance to corrosion, particularly in chloride environments, Cr20Ni30 is used in marine applications such as ship components, offshore oil rigs, and underwater pipelines.
7. Industrial Incinerators
- Suitable for use in waste incinerators and other high-temperature industrial processes that involve corrosive gases or residues.
8. Aerospace Components
- Cr20Ni30 is used in aerospace applications such as engine parts, exhaust systems, and other high-performance components exposed to extreme heat and mechanical stresses.
9. Heat Resistant Coatings
- Cr20Ni30 is sometimes used in coatings for high-temperature applications to provide resistance to oxidation and wear.
10. Piping Systems
- Used for high-temperature and high-pressure piping in industries like petrochemical, where both corrosion resistance and mechanical strength are required.
In summary, Cr20Ni30 is utilized in industries like aerospace, power generation, chemical processing, marine, and waste management, where its high-temperature stability, corrosion resistance, and mechanical properties ensure long-term reliability in demanding conditions.
Technical data of wires
| Dia. (mm) |
Cross-sectional area (mm²) |
Weight/Meter (g/m) |
Resistance/Meter at 20 ℃ (Ω/m) |
Dia. (mm) |
Cross-sectional area (mm²) |
Weight/Meter (g/m) |
Resistance/Meter at 20 ℃ (Ω/m) |
| 0.018 |
0.000255 |
0.002117 |
3410-4610 |
0.25 |
0.04909 |
0.4074 |
20.88-23.54 |
| 0.020 |
0.000314 |
0.002606 |
2940-3740 |
0.28 |
0.06158 |
0.5111 |
16.64-18.76 |
| 0.022 |
0.000380 |
0.003154 |
2440-3100 |
0.30 |
0.07069 |
0.5867 |
14.49-16.35 |
| 0.025 |
0.000491 |
0.004075 |
1880-2400 |
0.32 |
0.07548 |
0.6265 |
12.74-14.36 |
| 0.028 |
0.000616 |
0.005113 |
1530-1870 |
0.33 |
0.08553 |
0.7099 |
12.20-13.40 |
| 0.030 |
0.000707 |
0.005868 |
1338-1696 |
0.38 |
0.1134 |
0.9412 |
9.13-10.09 |
| 0.032 |
0.000804 |
0.006673 |
1180-1440 |
0.40 |
0.1257 |
1.0433 |
8.24-9.108 |
| 0.035 |
0.000962 |
0.007985 |
981-1200 |
0.41 |
0.132 |
1.0956 |
7.68-8.89 |
| 0.040 |
0.001257 |
0.01043 |
780.7-954.1 |
0.45 |
0.159 |
1.3197 |
6.51-7.196 |
| 0.045 |
0.00159 |
0.0132 |
594-726 |
0.50 |
0.1963 |
1.6293 |
5.273-5.829 |
| 0.050 |
0.001963 |
0.01629 |
499.6-610.6 |
0.55 |
0.2376 |
1.9721 |
4.518-4.994 |
| 0.055 |
0.00238 |
0.01975 |
407-477 |
0.60 |
0.2827 |
2.3464 |
3.797-4.197 |
| 0.063 |
0.00312 |
0.02590 |
321.41-377.31 |
0.65 |
0.3318 |
2.7539 |
3.235-3.575 |
| 0.070 |
0.00385 |
0.03196 |
260.5-305.9 |
0.70 |
0.3848 |
3.1938 |
2.789-3.083 |
| 0.080 |
0.005027 |
0.04172 |
199.5-234.1 |
0.75 |
0.4418 |
3.6669 |
2.43-2.686 |
| 0.090 |
0.006362 |
0.0528 |
157.6-185.0 |
0.80 |
0.5027 |
4.1724 |
2.136-2.36 |
| 0.100 |
0.007854 |
0.0652 |
127.7-149.9 |
0.85 |
0.5674 |
4.7094 |
1.891-2.091 |
| 0.110 |
0.009852 |
0.08177 |
105.5-123.9 |
0.90 |
0.6362 |
5.2805 |
1.687-1.865 |
| 0.120 |
0.01227 |
0.1018 |
88.67-104.1 |
0.95 |
0.7088 |
5.883 |
1.46-1.62 |
| 0.140 |
0.01539 |
0.1277 |
65.85-75.77 |
1.00 |
0.7854 |
6.5188 |
1.367-1.511 |
| 0.150 |
0.01767 |
0.1467 |
56.75-66.63 |
1.10 |
0.9503 |
7.8875 |
1.13-1.26 |
| 0.160 |
0.02011 |
0.01669 |
50.42-58.00 |
1.12 |
0.9852 |
8.1772 |
1.05-1.17 |
| 0.170 |
0.022700 |
0.1884 |
44.18-51.86 |
1.18 |
1.0936 |
9.0769 |
0.95-1.05 |
| 0.180 |
0.02545 |
0.2112 |
40.26-45.40 |
1.20 |
1.313 |
10.8979 |
0.79-0.87 |
| 0.190 |
0.02835 |
0.2353 |
35.37-41.53 |
1.30 |
1.327 |
11.0141 |
0.78-0.86 |
| 0.200 |
0.03142 |
0.2608 |
32.62-36.78 |
1.40 |
1.539 |
12.7737 |
0.70-0.77 |
| 0.212 |
0.035300 |
0.2930 |
28.41-33.35 |
1.50 |
1.767 |
14.6661 |
0.60-0.67 |
| 0.220 |
0.03801 |
0.3155 |
26.65-30.39 |
1.60 |
2.011 |
16.8924 |
0.52-0.58 |
The tolerance or wires diameter
| Wires |
Dia.(mm) |
Tolerance |
| 0.018-0.025 |
±0.001 |
| 0.028-0.035 |
±0.0015 |
| 0.040-0.055 |
±0.002 |
| 0.070 |
±0.0025 |
| 0.08-0.10 |
±0.003 |
| 0.11-0.14 |
±0.004 |
| 0.16-0.20 |
±0.005 |
| 0.22-0.25 |
±0.006 |
| 0.28-0.30 |
±0.007 |
| 0.32-0.40 |
±0.01 |
| 0.41-0.50 |
±0.015 |
| 0.55-0.80 |
+0.02/-0.03 |
| 0.85-1.00 |
+0.02/-0.03 |
| 1.10-1.50 |
±0.03 |
| Note:special specification can be produced as per client's request. |
Technical data of ribbon
| Thickness × Width(mm) |
Resistance/meter(20 ℃) (Ω/m) |
Surface area/ohm (20℃) (cm2/Ω) |
Weight/meter (g/m) |
Surface area/meter (cm2/m) |
| 0.09x2.5 |
5.27 |
9.84 |
1.72 |
51.8 |
| 0.08x0.2 |
74 |
0.0756 |
0.122 |
5.6 |
| 0.08x0.3 |
49.4 |
0.154 |
0.183 |
7.6 |
| 0.08x0.4 |
37 |
0.259 |
0.244 |
9.6 |
| 0.08x0.5 |
29.6 |
0.392 |
0.305 |
11.6 |
| 0.08x0.6 |
24.7 |
0.551 |
0.367 |
13.6 |
| 0.08x0.7 |
21.2 |
0.737 |
0.428 |
15.6 |
| 0.08x0.8 |
18.5 |
0.951 |
0.489 |
17.6 |
| 0.08x0.9 |
16.5 |
1.19 |
0.55 |
19.6 |
| 0.08x1.0 |
14.8 |
1.46 |
0.611 |
21.6 |
| 0.08x1.2 |
12.3 |
2.07 |
0.733 |
25.6 |
| 0.08x1.5 |
9.87 |
3.2 |
0.916 |
31.6 |
| 0.08x1.8 |
8.23 |
4.57 |
1.1 |
37.6 |
| 0.08x2.0 |
7.4 |
5.62 |
1.22 |
41.6 |
| 0.07x0.2 |
84.6 |
0.0638 |
0.107 |
5.4 |
| 0.07x0.3 |
56.4 |
0.131 |
0.16 |
7.4 |
| 0.07x0.4 |
42.3 |
0.222 |
0.214 |
9.4 |
| 0.07x0.5 |
33.9 |
0.337 |
0.267 |
11.4 |
| 0.07x0.6 |
28.2 |
0.475 |
0.321 |
13.4 |
| 0.07x0.7 |
24.2 |
0.637 |
0.374 |
15.4 |
| 0.07x0.8 |
21.2 |
0.822 |
0.428 |
17.4 |
| 0.07x0.9 |
18.8 |
1.03 |
0.481 |
19.4 |
| 0.07x1.0 |
16.9 |
1.26 |
0.535 |
21.4 |
| 0.07x1.2 |
14.1 |
1.8 |
0.641 |
25.4 |
| 0.07x1.5 |
11.3 |
2.78 |
0.802 |
31.4 |
| 0.06x0.2 |
98.7 |
0.0527 |
0.0916 |
5.2 |
| 0.06x0.3 |
65.8 |
0.109 |
0.137 |
7.2 |
| 0.06x0.4 |
49.4 |
0.186 |
0.183 |
9.2 |
| 0.06x0.5 |
39.5 |
0.284 |
0.229 |
11.2 |
| 0.06x0.6 |
32.9 |
0.401 |
0.275 |
13.2 |
| 0.06x0.7 |
28.2 |
0.539 |
0.321 |
15.2 |
| 0.06x0.8 |
24.7 |
0.697 |
0.367 |
17.5 |
| 0.06x0.9 |
21.9 |
0.875 |
0.412 |
19.2 |
| 0.06x1.0 |
19.7 |
1.07 |
0.458 |
21.2 |
| 0.06x1.2 |
16.5 |
1.53 |
0.55 |
25.2 |
| 0.05x0.2 |
118 |
0.0422 |
0.0764 |
5.00 |
| 0.05x0.3 |
79 |
0.0886 |
0.115 |
7.00 |
| 0.05x0.4 |
59.2 |
0.152 |
0.153 |
9.00 |
| 0.05x0.5 |
47.4 |
0.232 |
0.191 |
11.00 |
| 0.05x0.6 |
39.5 |
0.329 |
0.229 |
13.00 |
| 0.05x0.7 |
33.9 |
0.443 |
0.267 |
15.0 |
| 0.05x0.8 |
29.6 |
0.574 |
0.305 |
17.0 |
| 0.05x0.9 |
16.3 |
0.722 |
0.344 |
19.0 |
| 0.05x1.0 |
23.7 |
0.886 |
0.382 |
21.0 |
| Ribbon is rolled by the wire, the actual cross-sectional area of the ribbon is smaller 8％ than calculated by the rectangular. |
Product Tags:
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NiCr Alloy Cr20Ni30 Nickel-Chromium-Iron Alloys for High-Performance Electrical Applications Images
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