Steel A20
Description
Steel A20
Steel A20: a brand of steels and alloys. Below is a 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 A20.
General information of A20 steel
| Substitute brand |
| steel A12 |
| Delivery type |
| Hexagon a20, long products, including shaped: GOST 1414−75, GOST 2590−71, GOST 2591−71, GOST 2879−69. Calibrated bar GOST 8559−75, GOST 8560−78, GOST 7417−75. Polished bar and silver bar GOST 14955−77. |
| Application |
| Small parts of machines and devices, lightly loaded parts of complex configuration, which are subject to requirements for high dimensional accuracy and surface quality, after carburizing and cyanidation — lightly loaded parts, which are subject to requirements for wear resistance and improved surface quality. |
Chemical composition of steel A20
| Chemical element |
% |
| Silicon (Si) |
0.15−0.35 |
| Manganese (Mn) |
0.70−1.00 |
| Sulfur (S) |
0.08−0.15 |
| Carbon (C) |
0.17−0.24 |
| Phosphorus (P), no more |
0.06 |
Mechanical properties of A20 steel
Mechanical properties
| Heat treatment, delivery condition |
Section, mm |
σ B, MPa |
δ 5 ,% |
ψ,% |
HB |
| Hot rolled steel |
100 |
450 |
20 |
thirty |
168 |
| Calibrated work-hardened steel |
100 |
530 |
7 |
|
217 |
Technological properties of steel A20
| Forging temperature |
| Beginning 1180, end 850. |
| Weldability |
| not applicable for welded structures |
| Tendency to release ability |
| not inclined |
| Flock sensitivity |
| sensitive |
Temperature of critical points of steel A20
| Critical point |
° C |
| Ac1 |
735 |
| Ac3 |
866 |
| Ar3 |
840 |
| Ar1 |
685 |
