Steel 20KHGSA
Description
Steel 20KHGSA
Steel 20HGSA: a 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 20HGSA.
General information about steel 20HGSA
| Substitute brand |
| Steel 30HGSA. |
| Delivery type |
| Long products, including shaped: GOST 4543−71, GOST 259071, GOST 2591−71, GOST 2879−69, GOST 10702−78. Calibrated bar GOST 7417−75, GOST 8559−75, GOST 8560−78, GOST 10702−78. Polished bar and silver bar GOST 14955−77. Strip GOST 103−76. Forgings and forged billets GOST 1133−71, GOST 4543−71. |
| Application |
| Lead screws, axles, shafts, worms and other parts operating under wear conditions and under alternating loads at temperatures up to 200 ° C. |
Chemical composition of steel 20HGSA
| Chemical element |
% |
| Silicon (Si) |
0.90−1.20 |
| Manganese (Mn) |
0.80−1.10 |
| Copper (Cu), no more |
0.30 |
| Nickel (Ni), no more |
0.30 |
| Sulfur (S), no more |
0.025 |
| Carbon (C) |
0.17−0.23 |
| Phosphorus (P), no more |
0.025 |
| Chromium (Cr) |
0.80−1.10 |
Mechanical properties of steel 20HGSA
| Heat treatment, delivery condition |
Section, mm |
σ 0.2, MPa |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
| Hardening 880 ° С, oil. Vacation 500 ° C, water or oil. |
fifteen |
640 |
780 |
12 |
45 |
69 |
Mechanical properties depending on the tempering temperature
| Section, mm |
σ B, MPa |
δ 5 ,% |
ψ,% |
KCU, J / m 2 |
HB |
| Samples. Hardening 900 ° C, exposure after tempering 30 min, air cooling. |
| 200 |
1520 |
nine |
49 |
59 |
420 |
| 300 |
1470 |
nine |
52 |
59 |
400 |
| 400 |
1340 |
8 |
50 |
49 |
360 |
| 500 |
1080 |
ten |
50 |
78 |
325 |
| 600 |
880 |
17 |
52 |
98 |
255 |
Technological properties of steel 20HGSA
| Forging temperature |
| The beginning is 1200, the end is 800. |
| Weldability |
| without restrictions RDS, KTS, ArDS, ADS under flux and gas shielding, EShS — subsequent heat treatment is required. |
| Machinability by cutting |
| at HB 140−207, K υ tv.spl. = 0.7, K υ b.st. = 0.60. |
| Tendency to release ability |
| inclined |
| Flock sensitivity |
| not sensitive |
Temperature of critical points of steel 20HGSA
| Critical point |
° C |
| Ac1 |
755 |
| Ac3 |
840 |
| Ar1 |
690 |
Impact strength of steel 20HGSA
Impact strength, KCU, J / cm 2
| Delivery status, heat treatment |
+20 |
-20 |
-40 |
-50 |
| Normalization 880 C, air. Vacation 650 C. Hardening 880 C, oil. Vacation 580−600 С. |
80 |
68 |
64 |
51 |
Physical properties of steel 20HGSA
| Test temperature, ° С |
20 |
100 |
200 |
300 |
400 |
500 |
600 |
700 |
800 |
900 |
| Density of steel, pn, kg / m 3 |
7760 |
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