ASTM B637 Inconel 718,UNS N07718,Nickel Alloy Steel Flange,Long Weld Neck Flange
ASTM B637 Inconel 718,UNS N07718,Nickel Alloy Steel Flange,Long Weld Neck Flange
ASTM B637 is a standard specification for precipitation-hardening nickel alloy bars, forgings, and blanks used in high temperature services.
UNS N07718, Inconel 718, is the core material of this standard and has wide applications. In China, it is known as GH4169. It is mainly composed of chromium and nickel, with nickel accounting for 50-55% and chromium for 17-21%. Its most significant characteristic is its high-temperature resistance.
| ASTM B637 Inconel 718 Nickel Alloy Steel Flange Chemical Composition Requirements | |
| Element | Composition (% by weight, max unless range is specified) |
| Nickel (Ni) | 50.0 - 55.0 |
| Chromium (Cr) | 17.0 - 21.0 |
| Iron (Fe) | Balance |
| Niobium (Nb) | 4.75 - 5.50 |
| Molybdenum (Mo) | 2.80 - 3.30 |
| Titanium (Ti) | 0.65 - 1.15 |
| Aluminum (Al) | 0.20 - 0.80 |
| Carbon (C) | 0.08 max |
| Manganese (Mn) | 0.35 max |
| Silicon (Si) | 0.35 max |
| Phosphorus (P) | 0.015 max |
| Sulfur (S) | 0.015 max |
| Boron (B) | 0.006 max |
| Copper (Cu) | 0.30 max |
| Cobalt (Co) | 1.0 max |
| ASTM B637 Inconel 718 Nickel Alloy Steel Flange Mechanical Properties | ||
| Property | Test Temperature | Requirement / Typical Value |
| Tensile Strength | Room Temp | ≥ 1300 MPa (185 ksi) min |
| Yield Strength (0.2% Offset) | Room Temp | ≥ 1030 MPa (150 ksi) min |
| Elongation | Room Temp | ≥ 12% min |
| Reduction of Area | Room Temp | ≥ 15% min |
| Hardness | Room Temp | 331 - 401 HB (35 - 43 HRC) |
| Tensile Strength | 650°C (1200°F) | ≥ 1000 MPa (145 ksi) typ |
| Yield Strength (0.2% Offset) | 650°C (1200°F) | ≥ 860 MPa (125 ksi) typ |
Applications:
1.Aerospace: jet engine flanges, rocket fuel system connectors.
2.Oil and gas: deep-sea drilling equipment flanges, high-pressure and high-temperature (HPHT) wellhead devices.
3.Nuclear power and energy: nuclear reactor cooling system flanges, gas turbine exhaust components.
4.Chemical equipment: high-temperature reactor flanges, acidic medium (HCl, H₂SO₄) transmission pipelines.
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