Short answer: the Chinese GB equivalent of NiCr 40/20 — also written Ni40Cr20 — is Cr20Ni35 under GB/T 1234. It is not Cr20Ni40: no such grade exists in the Chinese standard.
| Property | NiCr 40/20 | GB Cr20Ni35 |
|---|---|---|
| Grade | NiCr 40/20 (Ni40Cr20) | GB Cr20Ni35 |
| Ni % | min 37.0 | 34.0 – 37.0 |
| Cr % | 18 – 22 | 18.0 – 21.0 |
| Si % | 1.8 – 3.0 | 1.00 – 3.00 |
| Mn % | max 1.0 | max 1.00 |
| C % | max 0.10 | max 0.08 |
| Fe | balance | balance |
| Resistivity ρ20 | ≈ 1.05 μΩ·m | 1.04 ± 0.05 μΩ·m |
| Max operating temp. | ≈ 1050 °C | ≈ 1050 °C |
The two overlap across the whole composition range and their resistivity differs by roughly 1 %. Cr20Ni35 is the grade that matches NiCr 40/20 in the Chinese standard.
| Typical application |
|---|
| Medium-temperature heating elements up to ≈ 1050 °C |
| Domestic and commercial heating appliances |
| Heavy-duty rheostats and power resistors |
| Convection heaters, fan heaters |
| Automotive seat heating, floor heating |
| Defrost / de-icing cable and rope heaters |
| Grade | ρ20 | Max temp. | Positioning |
|---|---|---|---|
| Grade | ρ20 (μΩ·m) | Max temp. (°C) | Positioning |
| Cr20Ni35 | 1.04 | 1050 | Matches NiCr 40/20 / Ni40Cr20 |
| Cr20Ni30 | 1.06 | 1050 | Lower nickel, lower cost |
| Cr20Ni80 | 1.09 | 1200 | General-purpose, best ductility |
| Cr15Ni60 | 1.12 | 1150 | Fe-bearing, cost-effective |
| 0Cr25Al5 | 1.40 | 1300 | FeCrAl, higher temperature |
| Form | Size range |
|---|---|
| Wire | φ0.03 – 10 mm |
| Strip / ribbon | thickness 0.05 – 3.5 mm × width 2 – 300 mm |
| Shaped elements | corrugated / edge-wound / helical, made to drawing |
| Condition | annealed soft / half-hard |
| Surface | bright annealed / acid pickled |
Shanghai Xinxiang Alloy Materials Co., Ltd. was founded in 2014 and is a source manufacturer of electric heating alloys and nickel-based precision alloys. We operate an approximately 20,000 m² production base in Taixing, Jiangsu, with 48+ pieces of melting, forging, rolling, drawing, heat-treatment and testing equipment, 200+ staff and an annual capacity of about 7,500 tonnes.
Our range covers pure nickel wire & strip (Ni200 / Ni201 / N4 / N6), nickel-chromium wire & strip (Cr20Ni80 / Cr15Ni60 / Cr30Ni70 / Cr20Ni35), FeCrAl heating alloys, resistance ribbon and shaped elements, thermocouple materials and heat-resistant steel furnace parts.
Contact: Tel +86 136 6174 5686 / +86 21 6911 6339
Sources: GB/T 1234 High-resistance electrical heating alloys; ASTM B344; DIN 17470 / 17471; published manufacturer data sheets. Grade cross-references are commercial equivalents, not a guarantee of interchangeability. Final acceptance is subject to the composition sheet agreed at order.
What is the Chinese equivalent of NiCr 40/20 or Ni40Cr20?
GB Cr20Ni35. NiCr 40/20 has Ni ≥37.0%, Cr 18–22%, Si 1.8–3.0% and resistivity ≈1.05 μΩ·m; GB Cr20Ni35 has Ni 34.0–37.0%, Cr 18.0–21.0%, Si 1.00–3.00% and resistivity 1.04 μΩ·m. The two overlap across the composition range.
Is there a grade called Cr20Ni40 in the Chinese standard?
No. GB/T 1234 does not define Cr20Ni40. Some Chinese suppliers use it as a commercial name, but the standardised grade is Cr20Ni35.
Does NiCr 40/20 have an ASTM or DIN number?
No. It has no ASTM, UNS, Werkstoff or DIN designation — it is an industry trade grade.
Can NiCr 40/20 be used in a sulphur-bearing atmosphere?
No. All nickel-chromium grades are unsuitable in sulphur atmospheres. Use FeCrAl instead.
