Nickel Alloy 70NB – Heat Resistance and Corrosion Resistance up to 900 °C
General Characteristics of 70NB
Nickel alloy 70NB (EI868) is a heat-resistant, corrosion-resistant material with a high nickel content (up to 71%) and chromium (up to 17%). Designed for operation in temperatures up to 900 °C, it features stable strength, excellent weldability, and reliable performance in aggressive gas and chemical environments.
Grade designation: 70NB / EI868
Alloy type: heat-resistant, deformable
Operating temperature: up to +900 °C
Standards: GOST 5632-72, TU 14-1-3296-83
Chemical Composition of 70NB (%):
Ni — 68–71
Cr — 15–17
Si — 2.5–3.5
Mn — ≤ 1.0
Fe — ≤ 6.0
Impurities (C, P, S) — ≤ 0.03
This composition ensures that the alloy maintains its mechanical strength and corrosion resistance even in sulfur-containing and aggressive environments.
Mechanical Properties:
Tensile strength: 600–800 MPa
Yield strength: 300–400 MPa
Hardness: 170–200 HB
Elongation at break: ≥ 25%
Operating temperature: up to 900 °C
Applications
Nickel alloy 70NB is used in the following industries:
Chemical industry – vessels, heat exchangers, reactors
Energy sector – heat-resistant components, furnaces, combustion chambers
Mechanical engineering – shafts, bearings, fasteners
Metallurgy – furnace linings, pipe cladding
Petrochemical industry – equipment for environments containing H₂S and acids
Advantages and Features
Heat resistance up to 900 °C
Excellent resistance to sulfur, acids, and industrial gases
Good weldability with standard methods
Long service life under thermal cycling
Suitable for manufacturing critical components
Available Supply Formats
Round bar: from 6 to 200 mm
Plate / sheet: from 1.5 to 50 mm
Wire, strip, flat bar – on request
Custom blanks according to your drawing
Cutting, packaging, and delivery across the EU and CIS are available.
Buy Nickel Alloy 70NB
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Delivery Forms 70HB
| 70HB wheel | Diameter 4-300mm |
| 70HB sheet | Thickness 0.5-20mm |
| 70HB Tape | Thickness 0.2-2mm |
| 70HB strip | Thickness 10-50mm |
| 70HB wire | Diameter 0.5-9mm |
| 70HB Tube | – Hot Rolled Round Tube diameter 38 or more up to 244.5 mm, thickness from 3 to 25 mm -Cold drawn round tube diameter from 6 to 219.1mm thickness from 0.9 to 14.2mm |
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