Chinese grade: GH3128/GH128 Nickel-based high-temperature alloy
Russian brand: ЭИ435/XH78T
Overview of Gh3128 Nickel-based High Temperature Alloy
Gh3128 is a nickel-based alloy, solid solution strengthening of tungsten and molybdenum, and grain boundaries strengthening of boron, cerium and zirconium. It has high plasticity, high creep fracture strength, good oxidation resistance, stamping and welding properties. Its comprehensive performance is better than GH3044 and GH3536. It is suitable for the manufacturing of high-temperature components such as flame cylinders, afterburner chamber shells, and adjustment plates that operate at 950°C for a long time. The main products are cold-rolled plates, which can also be supplied with hot-rolled plates, bars, forgings, wires and pipes.
Gh3128 Material Grade: Gh3128 (gh128, Red Star 11).
Gh3128 similar brands.
Gh3128 Material Technical Standard
●Gh3128 Chemical Ingredients
| C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≥ | Ni≥ | Mo≥ | Cu≤ |
| 0.05 | 0.80 | 0.50 | 0.013 | 0.013 | 19.0-22.0 | margin | 7.50-9.0 |
|
| other | N≤ | Al≤ | Ti≤ | Fe≤ | B≤ | Zr≤ | W≤ | Ce≤ |
| - | 0.40-0.08 | 0.40-0.80 | 0.20 | 0.005 | 0.06 | 7.50-9.0 | 0.05 |
Note: B, CE, Zr are added according to the calculated amount.
Gh3128 heat treatment system: The solid solution temperature at the factory is 1140~1180℃, air-cooled. It was supplemented with solid solution treatment at 1200°C and its high temperature performance was tested.
Gh3128 specifications and supply conditions: cold-rolled thin plate δ0.8~4.0mm, hot-rolled thin plate δ4~14mm, cold-drawn steel wire d0.3~10mm. Cold-rolled and hot-rolled plates are supplied after solid solution and pickling; welding wires are supplied under cold-drawn, semi-hard or solid solution and pickling conditions.
Gh3128 smelting and casting process: remelting with electroslag in non-vacuum or vacuum induction furnace.
Application overview and special requirements of Gh3128: This alloy is suitable for the manufacturing of aircraft engine combustion chambers and afterburner combustion chamber parts working below 950℃, and has good application effect.
Physical and chemical properties of Gh3128
●Thermal performance of Gh3128
(1) The melting temperature range of Gh3128 (gh128) is 1340~1390℃.
(2) Gh3128 (gh128) Thermal conductivity
| I/℃ | 18-100 | 18-200 | 18-300 | 18-400 | 18-500 | 18-600 | 18-700 | 18-800 | 18-900 | 18-1000 |
| A/10-6 ℃ -1 | 11.25 | 11.86 | 12.68 | 12.80 | 13.37 | 13.68 | 14.46 | 15.19 | 15.66 | 16.29 |
●Gh3128 linear expansion coefficient
Thermal diffusion coefficient of Gh3128
| I/℃ | 18-100 | 18-200 | 18-300 | 18-400 | 18-500 | 18-600 | 18-700 | 18-800 | 18-900 | 18-1000 |
| A/10-6 ℃ -1 | 11.25 | 11.86 | 12.68 | 12.80 | 13.37 | 13.68 | 14.46 | 15.19 | 15.66 | 16.29 |
●Gh3128 density: ρ=8.81g/cm³.
Gh3128 electrical performance: resistivity meter.
Gh3128 Magnetic properties: Alloy is non-magnetic.
| I/℃ | 25 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900 |
| Q/（10-6m2/S）） | 2.30 | 2.49 | 2.78 | 3.08 | 3.39 | 3.69 | 3.88 | 4.16 | 3.92 | 4.16 |
| I/℃ | 17 | 850 | 900 | 950 | 1000 | 1050 | 1100 | 1150 |
| p/（10-6Ω.M）） | 1.37 | 1.42 | 1.39 | 1.40 | 1.39 | 1.38 | 1.38 | 1.39 |
GH3128 Chemical Properties
●GH3128 antioxidant properties: oxidation rate of alloy after 100 hours of test in air medium
| I/℃ | 900 | 1000 | 1100 |
| Oxidation rate/(g/(m2·h)) | 0.055 | 0.236 | 0.269 |
●Corrosion resistance: Marine gas corrosion performance
| Test system | Sample size/mm | Weight loss/(mg/cm2) | Macro inspection |
| 900 ℃， 27H | 1.5×15×30 | 2.2 | The surface is perfect |
Note: The test conditions are that the ratio of air to fuel is 39:1, the salt atmosphere concentration is 106×10-6, and the fuel is No. 0 diesel.
GH3128 Mechanical Properties
● Performance specified in GH3128 standard
| variety | Sample status | I/℃ | Tensile properties | Persistent performance |
| σb/MPa | D5/% | Π/MPI | D/mm | t/h | D5/% |
| Not less than |
| Hot rolled plate | Delivery status | 20 | 735 | 40 | - | - | - | - |
| Delivery status +1200℃, air-cooled | 950 | 175 | 40 | - | - | - | - |
| Cold rolled thin plate | Delivery status | 20 | 735 | 40 | - | - | - | - |
| Delivery status +1200℃, air-cooled | 950 | 175 | 40 | Specification I 54 | >1.2 ≤1.2 | ≥23 ≥20 | Actual test |
| Specification II 39 | ≥1.5 <1.5～1.0 ≤1.0 | ≥100 ≥80 ≥70 | Actual tests Actual tests |
Note: The initial test of durability performance is carried out according to specification one. If the inspection fails according to specification one, the inspection can be re-inspected according to specification two.