Chemical composition
Nominal: mid-range where both limits are given, the cap where only a maximum is, balance takes the remainder. Exact specified ranges below.
| Element | Name | Content % | |
|---|---|---|---|
| Main elements6 elements | |||
| Ni | Nickel | Bal. | |
| Cr | Chromium | 19 – 22% | |
| W | Tungsten | 7.5 – 9% | |
| Mo | Molybdenum | 7.5 – 9% | |
| Ti | Titanium | 0.4 – 0.8% | |
| Al | Aluminium | 0.4 – 0.8% | |
| Element | Name | Content % | |
|---|---|---|---|
| Minor & residual10 elements | |||
| Fe | Iron | ≤ 2% | |
| Si | Silicon | ≤ 0.8% | |
| Mn | Manganese | ≤ 0.5% | |
| C | Carbon | ≤ 0.05% | |
| Cu | Copper | ≤ 0.25% | |
| P | Phosphorus | ≤ 0.013% | |
| S | Sulphur | ≤ 0.013% | |
| B | Boron | ≤ 0.005% | |
| Ce | Cerium | ≤ 0.05% | |
| Zr | Zirconium | ≤ 0.06% | |
Mechanical minima by form
Guaranteed values differ by form, size and delivery condition; quotations confirm the specification, form, size and condition.
| Form | Condition | Rm MPa | Rp0.2 MPa | A ≥ % | Other requirements and notes |
|---|---|---|---|---|---|
| Hot-rolled plate | As delivered (solution treated 1110–1180 °C, air cooled) | ≥ 735 | — | ≥ 40 | Tensile test at 950 °C (as delivered, re-solution-treated at 1200 °C and air cooled): tensile strength ≥ 175 MPa, elongation ≥ 40 %. |
| Cold-rolled sheet | As delivered (solution treated 1110–1180 °C, air cooled) | ≥ 735 | — | ≥ 40 | Tensile test at 950 °C (as delivered, re-solution-treated at 1200 °C and air cooled): tensile strength ≥ 175 MPa, elongation ≥ 40 %. Stress rupture after the same treatment at 950 °C / 54 MPa: ≥ 20 h for 0.50–1.20 mm, ≥ 23 h over 1.20 mm; a failed first test may be retested under the alternative 950 °C / 39 MPa set. Grain size No. 4 or finer. |
Where this grade is recommended
Matched in 6 service conditions; ranks and scores computed from the condition-scoring matrix.
| Service condition | Industry | Temperature | Rank | Score |
|---|---|---|---|---|
| Furnace internals & fixtures | Furnaces & Vacuum | ≤ 900 °C | 6 / 12 | 88 |
| Engine hot section | Aerospace | 900 – 1100 °C | 5 / 9 | 87 |
| Quench & carburising fixtures | Furnaces & Vacuum | 850 – 950 °C | 7 / 8 | 86 |
| HT boiler & superheater | Power & Nuclear | 450 – 600 °C | 6 / 6 | 84 |
| SOFC interconnects | Hydrogen & New Energy | 600 – 850 °C | 4 / 4 | 82 |
| Gas-turbine hot section | Power & Nuclear | 800 – 950 °C | 10 / 10 | 81 |
Applicable standards
4 specifications. Name the standard and its edition on the order.
Guaranteed values and required tests differ between specifications — see Mechanical minima by form for the figures per form.
Frequently asked questions
What is GH3128?
GH3128 — Ni superalloys. Strengthened sheet grade — 950 °C-class cans and heat shields
What is the maximum service temperature of GH3128?
Typically about 950 °C; the practical limit depends on media, stress and design life — acceptance per the governing standard.
What is the tensile strength of GH3128?
The specified minimum tensile strength is 735 MPa for the main product form. Minima for other forms and sizes are listed under "Mechanical minima by form" on this page.
Which standards cover GH3128?
GB/T 14992 (superalloy designations & chemistry), GB/T 14995 (wrought superalloys — hot-rolled plate), GB/T 14996 (wrought superalloys — cold-rolled sheet and strip), GJB 1952 (cold-rolled sheet, aerospace)
Where is GH3128 typically used?
Furnace internals & fixtures (Furnaces & Vacuum); Engine hot section (Aerospace); Quench & carburising fixtures (Furnaces & Vacuum); HT boiler & superheater (Power & Nuclear)
In which forms is GH3128 available?
Tube, plate, strip, bar, forgings, wire and other forms — sizes and delivery condition confirmed per order, with EN 10204 3.1 / 3.2 certification.
Same series
Download PDF datasheet
This grade’s datasheet as an A4 PDF — for filing, printing or forwarding to colleagues.
Download PDF datasheetSupply & enquiry
Tube & pipeφ1 – 219 × 0.25 – 25 mm
Plate4.76 – 80 mm
Barφ8 – 300 mm
Wire & filler metalsφ0.01 – 8 mmFor this grade we can supply, against your service conditions:
- Tube, plate, strip, bar, forgings, wire and more — with size range and lead time
- Chemistry and mechanical test report (EN 10204 3.1 / 3.2)
- Like-for-like alternatives and selection advice
- Applicable standards and inspection scope
Or email us: info@kochlin.com