GH738 Superalloy Material is a brocade-based superalloy hardened by V' phase precipitation, which has good gas corrosion resistance, high yield strength and fatigue performance, good process plasticity and stable structure. It is widely used in rotating parts of aero engines, and the use temperature is not higher than 815°C. It can produce cold-rolled and hot-rolled plates, tubes, strips, wires and forgings, castings, fasteners.It is one of the Special Steel Materials.
GH738 material grade: GH738
GH738 Similar grades Waspaloy (USA), NC20K14 (France)
The technical standard of GH738 material is standard
GH738 Chemical Composition:
| C | Cr | Ni | Co | Mo | AI | Ti | B |
| 0.03~0.10 | 18.0~21.0 | Yu | 12.0~15.0 | 3.50~5.00 | 1.20~1.60 | 2.75~3.25 | 0.003~0.010 |
| Zr | Fe≥ | Mn≥ | Si≥ | P≥ | S≥ | Cu≥ | |
| 0.02~0.08 | 2.0 | 0.10 | 0.15 | 0.015 | 0.015 | 0.10 | |
Note: The trace impurities are w(Pb)≤0.001%, w(As)≤0.0025%, w(Sn)≤0.0012%, w(Sb)≤0.0025%, w(Bi)≤0.0001%, GH738 heat treatment system 1080°C 10°C, 4h, air cooling 840°C, 24h, air cooling 760°C, 16h, air cooling. GH738 variety specifications and supply status can produce bars, profiles, forgings, ring parts, thick plates, thin plates, strips, pipes, wires, sand castings, precision castings and fasteners, etc., usually delivered without heat treatment, and delivered after solution treatment of plates. GH738 melting and casting process adopts vacuum induction melting and vacuum arc remelting process.
GH738 Application Overview and Special Requirements This alloy is widely used in aero engines and gas turbines abroad, mainly used as turbine blades and turbine discs and other rotating parts, and has mature use experience. Due to the high cobalt content of this alloy, it is rarely used in China.
GH738 Organizational Structure
GH738 phase change temperature The dissolution temperature of the y' phase in the alloy is 980~1050°C, and the precipitation temperature from the matrix is 630°C, and the peak precipitation temperature is 800°C. The initial precipitation temperature of the M23C6 carbide phase in the alloy is 700°C, and the complete dissolution temperature is 1020°CC.
GH738 time-temperature-tissue transition curve
Microstructure of GH738 alloy After standard heat treatment, in addition to the austenitic matrix, there are phases, the chemical formula of which is (Ni0.883Fe0.03Cr0.048C00.039) 3.28 (A10.38Ti0.62Mo trace), and the total amount of this phase accounts for 20% of the weight of the alloy. In addition, there is M23C6 carbide, whose chemical formula is approximate (Cr0.746M00.094Ni0.084C00.041Fe0.023Ti0.012)23C6, in addition, there is a small amount of Ti(CN) and TiN isophases, the alloy is aged to 3000h by 650°C and 730°C for a long time, "the number of phases does not change significantly, and there is about 3% and 1% of the supplementary precipitation respectively, The V' phase size increased from 146nm to 196nm and 177nm, respectively. The total carbide content increased slightly from 0.5% to 0.76% and 0.78% of the total matrix before aging. In the process of long-term aging, no new phases precipitate, and the organization is stable.
Delivery of GH738 Materials:According to different delivery status, specification size, rolling method, origin, etc.:GH738 plate can be called GH738 Stainless Steel Plate, GH738 steel plate, GH738 coil plate, GH738 open flat plate, GH738 strip steel, GH738 cold-rolled plate, GH738 hot-rolled plate, GH738 thin plate, GH738 medium plate, GH738 thick plate, GH738 extra thick plate, etc.GH738 bar can be called GH738 Stainless Steel Round Bar, GH738 round bar, GH738 round bar, GH738 wire rod, GH738 wire bar, GH738 forged round, GH738 round bar, GH738 black bar, GH738 gross round, GH738 light circle, GH738 turning round bar, GH738 hot rolled round bar, GH738 round rolled round, GH738 cold drawn round bar, etc.GH738 pipe can be called GH738 Stainless Steel Pipe, GH738 Steel Pipe, GH738 Stainless Steel seamless pipe, GH738 seamless pipe, GH738 stainless steel welded pipe, GH738 welded pipe, GH738 stainless steel precision pipe, GH738 precision pipe, GH738 capillary pipe, etc.
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