Introduction
General
GH2747 is a Fe-Ni-Cr-based precipitation hardening high-temperature alloy. It is used in a solid solution state. Its long-term operating temperature is 1100℃~1250℃, while its short-term operating temperature up to 1300℃. The alloy has high strength and good Structural stability, excellent oxidation resistance and corrosion resistance. The alloy has good welding properties and can be welded through various processes. The main products include bars, plates, pipes, wires and forgings, etc.
Application and features:
GH2747 alloy has been used to make high-temperature anti-oxidation components in aviation and aerospace engine combustion chambers and afterburners. It is also used to make various industrial furnace rollers, transmission devices, thermocouple sleeves and other heat-resistant components. It is especially suitable for high-temperature anti-oxidation device parts in petrochemical, nuclear energy, metallurgy and other fields.
The material cost of GH2747 alloy is lower than that of the same type of high-temperature alloy. On the basis of increased chromium and aluminum content, and rare earth elements, the oxidation resistance of the alloy at 1000℃~1300℃ is greatly improved.
Similar grade
ЗП747(Russia)
Spec
- GB/T 14992 Classification and grades of high-temperature alloys and intermetallic compounds high-temperature materials
- Q/GYB 511GH2747 alloy hot rolled and forged bars
- Q/GYB 512 GH2747 alloy cold drawn (rolled) seamless pipe
Smelting process
Vacuum induction furnace, or vacuum induction furnace + electroslag remelting, or non-vacuum induction furnace + electroslag remelting smelting process.
Chemical composition
| Element |
C |
Cr |
Ni |
Al |
Fe |
| wt, % |
≤0.10 |
15.00-17.00 |
44.00-46.00 |
2.90-3.90 |
Balance |
| Element |
Ce |
Mn |
Si |
S |
P |
| wt, % |
≤0.030 |
≤1.00 |
≤1.00 |
≤0.020 |
≤0.025 |
Heat treatment
The material is used as solution treated. 1000°C~1200°C, The holding time depends on the thickness of the material.
Form of supply at Xunshi
- Hot rolled & forged rod: diameter 5-300mm
- Hot rolled plate: 4-20mm
- Cold drawn seamless pipe: diameter 6-100mm
Density
7.78g/cm3
Thermal conductivity
| θ/°C |
100 |
200 |
300 |
400 |
500 |
| λ[W/(m·°C)] |
10.5 |
12.2 |
13.8 |
15.4 |
17.5 |
| θ/°C |
600 |
700 |
800 |
900 |
- |
| λ[W/(m·°C)] |
19.2 |
20.9 |
22.6 |
24.3 |
- |
Linear expansion coefficient
| θ/°C |
25-100 |
25-200 |
25-300 |
25-400 |
| α/(10-6°C-1) |
13.66 |
14.29 |
14.81 |
15.15 |
| θ/°C |
25-500 |
25-600 |
25-700 |
25-800 |
| α/(10-6°C-1) |
15.32 |
15.17 |
15.80 |
17.07 |
Elasticity
| θ/°C |
20 |
100 |
200 |
300 |
400 |
| E/Gpa |
218 |
198 |
190 |
188 |
183 |
| θ/°C |
500 |
600 |
700 |
800 |
900 |
| E/Gpa |
177 |
159 |
146 |
128 |
122 |
Oxidation resistance in air
| θ/°C |
Oxidation rate[g/m2·h)] |
| 100h |
500h |
1000h |
2000h |
| 1200 |
25 |
- |
46 |
60 |
| 1250 |
28 |
42 |
61 |
75 |
| 1300 |
33 |
65 |
- |
174 |
| 1350 |
45 |
130 |
- |
- |
Corrosion resistance in flow air with 1.5% SO2
| θ/°C |
Corrosion rate(mm/year) |
| 1200 |
0.08 |
| 1250 |
0.10 |
| 1300 |
0.24 |
| 1350 |
- |
Mechanical properties
| Form |
Heat treatment |
θ/°C |
Mechanical properties |
| σb/MPa |
σP0.2/MPa |
δ5/% |
Ψ/% |
| Hot rolled and forged rod |
Standard |
20 |
≥550 |
≥200 |
≥15 |
≥20 |
| 1000 |
≥40 |
≥20 |
≥30 |
≥30 |
| Cold drawn seamless pipe |
20 |
≥600 |
- |
≥30 |
- |
Typical properties of hot rolled rod at different temperature
| Specimen/mm |
θ/°C |
σb/MPa |
σP0.2/MPa |
δ5/% |
Ψ/% |
| Diameter 20 hot rolled rod, standard heat treatment |
20 |
600 |
300 |
50 |
55 |
| 800 |
150 |
100 |
33 |
30 |
| 900 |
70 |
60 |
35 |
35 |
| 1000 |
50 |
30 |
40 |
40 |
| 1100 |
30 |
20 |
70 |
55 |
| 1200 |
20 |
- |
90 |
75 |
Mechanical properties with different heat treatment under 20°C and 900°C
| Specimen |
Heat treatment |
20°C |
900°C |
| σb/MPa |
σP0.2/MPa |
δ5/% |
Ψ/% |
σb/MPa |
σP0.2/MPa |
δ5/% |
Ψ/% |
| Diameter 20, hot rolled rod |
1100°Cx1h/AC |
710 |
290 |
51 |
67 |
117 |
84 |
86 |
82 |
| 1130°Cx1h/AC |
655 |
250 |
52 |
69 |
120 |
82 |
108 |
86 |
| 1150°Cx1h/AC |
670 |
265 |
55 |
66 |
119 |
81 |
97 |
77 |
| 1180°Cx1h/AC |
650 |
240 |
63 |
66 |
121 |
90 |
90 |
82 |
| 1200°Cx1h/AC |
645 |
240 |
63 |
66 |
126 |
88 |
74 |
71 |
Mechanical properties aging hardened under 1000°C with different period
| Specimen |
Heat treatment |
20°C |
1000°C |
| θ/°C |
t/h |
σb/MPa |
σP0.2/MPa |
δ5/% |
Ψ/% |
σb/MPa |
σP0.2/MPa |
δ5/% |
Ψ/% |
| Diameter 20 hot rolled rod, standard heat treatment |
1000 |
100 |
810 |
330 |
33 |
57 |
64 |
48 |
74 |
98 |
| 790 |
300 |
39 |
55 |
59 |
38 |
101 |
99 |
| 300 |
820 |
330 |
39 |
63 |
58 |
38 |
86 |
98 |
| 805 |
325 |
36 |
58 |
61 |
39 |
79 |
97 |
| 500 |
800 |
310 |
34 |
58 |
98 |
50 |
76 |
97 |
| 815 |
330 |
40 |
62 |
64 |
50 |
84 |
97 |
Forming process and performance
Put alloy ingots into the furnace under a temperature of 1000 °C, forging heating temperature 1000-1200°C, open blank temperature above 1000 °C, final rolling temperature above 900 °C. Cold drawn deforming rate of seamless pipe ≤80%, annealing temperature ≥1000 °C, air cool.
About XUNSHI
Suzhou Xunshi New Material Co. Ltd- referred as XUNSHI hereafter, is a professional manufacturer of high-performance alloy products. XUNSHI is engaged in supplying high quality and cost-effective Superalloy, Anti-Corrosion Alloy, Precision Alloy, Special Stainless Steel and Magnetostrictive Material to customers worldwide.
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