Pure nickel and nickel alloy
N5/N6/N7/NY1
It has the following characteristics:
Nickel has high chemical stability and good corrosion resistance in many media. Its standard electrode position is -0.25v, which is positive than iron and negative than copper. Nickel has good corrosion resistance in dilute non-oxidizing properties (such as HCU, and H2SO4) and in the absence of dissolved oxygen, especially in neutral and alkaline solutions. That's because nickel has passivation ability, forming a dense protective film on the surface, which prevents the continuous oxidation of nickel.
Main application fields:
Chemical industry, wet corrosion-resistant parts of generator (water inlet heater and steam pipeline), pollution control equipment (waste gas desulfurization equipment), etc.
Table 1. Brand and standard
Pipes | Plates | Bar | Forging (chemical composition) | |
N6 | GB/T 2882-2005 | GB/T 2054-2005 | GB/T 4435-84 | GB/T 5235-2007 |
NY1 | GB/T 2056-2007 |
Table 2: chemical composition
Ni | Co | Cu | Si | Mn | C | S | Fe | Mg | P | Pb | |
N5 | ≥99.0 | ≤0.25 | ≤0.30 | ≤0.35 | ≤0.02 | ≤0.01 | ≤0.40 | — | — | —— | |
N6 | ≥99.5 | ≤0.10 | ≤0.10 | ≤0.05 | ≤0.10 | ≤0.005 | ≤0.10 | ≤0.10 | 0.002 | ≤0.002 | |
N7 | ≥99.0 | ≤0.25 | ≤0.30 | ≤0.35 | ≤0.15 | ≤0.01 | ≤0.10 | — | — | —— | |
NY1 | ≥99.7 | ≤0.10 | ≤0.10 | ≤0.10 | — | ≤0.10 | — | ≤0.005 | ≤0.20 | —— | |
Table 3: mechanical properties of the alloy at room temperature
Name Status | Tensile Strength | Extensibility % | Yield point MPa | Brinell hardness HB | Elastic limit MPa | impact toughness | |
Pure nickel | annealing | 294-588 | 10-30 | ≥117.6 | 90-120 | ≥78.4 | ≥31 |
cold-work | 490-882 | 2-20 | ≥686 | 120-240 | — | — |
