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.

Home › Products › Refractory & Insulation for Furnace Linings

Refractory & Insulation for Furnace Linings

Short answer: we supply ceramic fibre blanket, board and modules (1260 and 1430 grades), plus anchors and accessories, selected against the shell-temperature target and the furnace atmosphere.

Linings fail at the anchor, not in the fibre
When a lining falls down, the fibre is usually still intact — it has come away from the shell. Three causes account for most of it: anchor spacing too wide for the thickness, no ceramic washer, and no pre-compression. Fibre shrinks 2–3% at working temperature; if it was installed at nominal thickness, the shrinkage opens gaps, hot gas reaches the shell, the anchors oxidise and thin, and the lining drops.

1. Grades

Grade	Classification temp.	Typical use
1260 fibre blanket	1,260 °C	General furnace linings, backing insulation
1430 fibre blanket	1,430 °C	Hot face in high-temperature furnaces
Ceramic fibre board	1,260 °C	Load-bearing insulation, expansion joints
Folded modules	1,260 / 1,430 °C	Fast installation, good resistance to shrinkage gaps

2. Installation parameters

Item	Recommended	Why
Thickness	150 – 300 mm	Set by shell temperature target and furnace temperature
Density	96 – 128 kg/m³	Higher density resists gas erosion; lower insulates better
Anchor spacing	200 – 250 mm	Wider spacing lets the fibre pull away
Pre-compression	15 – 20%	Compensates for shrinkage at temperature
Ceramic washer	Always	Spreads load and slows anchor oxidation

3. Please confirm these 4 points before ordering

Furnace temperature and shell-temperature target — these two set the thickness.
Atmosphere — hydrogen and reducing atmospheres react with some fibre binders.
Whether the lining is hot-face or backing — modules and blanket are used differently.
Who installs it — if the pre-compression step will be skipped, say so and we will advise a different system.

Need a quotation?

Send grade, form, size with tolerance and quantity — we reply within one working day (GMT+8).

WhatsApp +86 180 6103 5177 Enquiry form

About Taizhou Aolante Alloy

Taizhou Aolante Alloy Materials Co., Ltd. was founded in 2010 and is a source manufacturer of electric heating alloys, precision resistance alloys and furnace accessories. Production base in Taixing, Taizhou, Jiangsu, approximately 20,000 m², 48+ pieces of melting, forging, rolling, drawing, heat-treatment and testing equipment, 200+ staff, annual capacity about 7,500 tonnes.

Our range covers heating wire and strip, heating cable, wide thin strip, radiant tubes, heat-resistant steel, conveyor belts, superalloys, industrial furnaces, thermocouples, refractory insulation, heating tubes, CuNi/MnCu alloys, far-infrared quartz tubes.

Contact: Tel +86 180 6103 5177 / +86 523 8751 8610 | Email althjcl@126.com

Grade cross-references are commercial equivalents, not a guarantee of interchangeability. Final acceptance is subject to the composition sheet agreed at order.