Steel 30KHN2MFA
Description
Steel 30KHN2MFA
Steel 30KHN2MFA: brand of steels and alloys. Below is the systematized information on the purpose, chemical composition, types of supplies, substitutes, temperature of critical points, physical, mechanical, technological and casting properties for the grade — Steel 30XN2MFA.
General information about steel 30HN2MFA
| Substitute brand |
| steel 30XN2VFA. |
| Delivery type |
| Long products, including shaped: GOST 4543−71, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 4543−71, GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78. Polished bar and silver bar GOST 4543−71, GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 8479−70. |
| Application |
| Shafts, solid forged rotors, discs, gearbox parts, bolts, studs and other critical parts of turbines and compressor machines operating at elevated temperatures. |
Chemical composition of steel 30KhN2MFA
| Chemical element |
% |
| Vanadium (V) |
0.10−0.18 |
| Silicon (Si) |
0.17−0.37 |
| Manganese (Mn) |
0.30−0.60 |
| Copper (Cu), no more |
0.30 |
| Molybdenum (Mo) |
0.20−0.30 |
| Nickel (Ni) |
2.00−2.40 |
| Sulfur (S), no more |
0.025 |
| Carbon (C) |
0.27−0.34 |
| Phosphorus (P), no more |
0.025 |
| Chromium (Cr) |
0.60−0.90 |
Mechanical properties of steel 30XN2MFA
| Heat treatment, delivery condition |
Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HB |
| Bar. Hardening 860 ° C, oil. Vacation 680 ° C, air. |
| |
25 |
785 |
880 |
ten |
40 |
88 |
|
| Forgings. Hardening. Vacation. |
| KP 490 |
100−300 |
490 |
655 |
thirteen |
40 |
54 |
212−248 |
| KP 490 |
300−500 |
490 |
655 |
12 |
35 |
49 |
212−248 |
| Bar. Hardening 850 ° С, oil. Vacation 200 ° C, air. |
| |
fifteen |
1470 |
1710 |
eleven |
50 |
58 |
|
Mechanical properties depending on the tempering temperature
| vacation t, ° С |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HRC e |
| Hardening 860 ° C, oil. |
| 200 |
1460 |
1650 |
8 |
51 |
68 |
50 |
| 300 |
1400 |
1550 |
8 |
55 |
54 |
48 |
| 400 |
1310 |
1410 |
nine |
56 |
65 |
44 |
| 500 |
1190 |
1230 |
ten |
58 |
93 |
40 |
Mechanical properties depending on the section
| Heat treatment, delivery condition |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
| Hardening 860 ° C, oil. Vacation 680 ° С, exposure 1.5 h. |
| Sample cutting location — center |
680 |
940 |
sixteen |
58 |
140 |
| Sample cutting location — edge |
790 |
890 |
19 |
66 |
170 |
| Sample cutting location — center |
740 |
900 |
20 |
65 |
170 |
Mechanical properties versus test temperature
| test t, ° C |
σ B, MPa |
δ 5 ,% |
ψ,% |
| Samples with a cross section of 10 mm. Hardening 860 ° C, oil. Vacation 500 ° C. |
| 250 |
1160 |
thirteen |
65 |
| 400 |
920 |
thirteen |
68 |
| 500 |
680 |
36 |
79 |
Technological properties of steel 30XN2MFA
| Forging temperature |
| Early 1200, late 800. Slow cooling. |
Temperature of critical points of steel 30XN2MFA
| Critical point |
° C |
| Ac1 |
720 |
| Ac3 |
830 |
| Ar3 |
555 |
| Ar1 |
365 |
Impact toughness of steel 30XH2MFA
Impact strength, KCU, J / cm 2
| Delivery status, heat treatment |
+20 |
-40 |
-60 |
| Guenching 860 C, oil. Vacation 200 C. |
68 |
60 |
56 |
| Guenching 860 C, oil. Vacation 300 C. |
55 |
50 |
46 |
| Guenching 860 C, oil. Vacation 400 S. |
62 |
53 |
50 |
| Guenching 860 C, oil. Vacation 500 S. |
82 |
70 |
61 |
Hardenability of steel 30XN2MFA
| Distance from the end, mm / HRC e |
| |
| |
| Heat treatment |
Crit. Diam. in water, mm |
Crit. Diam. in oil, mm |
Crete. hardness, HRCэ |
| Tempering 860 C. |
60 |
|
45−51 |
| Tempering 860 C. |
|
60 |
37−42 |
Physical properties of steel 30HN2MFA
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Normal elastic modulus, E, GPa |
216 |
207 |
206 |
188 |
176 |
169 |
|
|
|
|
| Torsional shear elastic modulus G, GPa |
87 |
81 |
77 |
73 |
68 |
64 |
|
|
|
|
| Thermal conductivity coefficient W / (m ° С) |
36 |
35 |
35 |
34 |
32 |
31 |
29 |
28 |
27 |
|
| Ud. electrical resistance (p, Nom. m) |
333 |
|
|
|
|
|
|
|
|
|
| Test temperature, ° С |
20−100 |
20−200 |
20−300 |
20−400 |
20−500 |
20−600 |
20−700 |
20−800 |
20−900 |
20−1000 |
| Linear expansion coefficient (a, 10−6 1 / ° С) |
11.1 |
11.7 |
12.3 |
12.9 |
13.3 |
13.7 |
|
|
|
|
| Specific heat (C, J / (kg ° C)) |
466 |
508 |
529 |
567 |
588 |
|
|
|
|
|
