Steel АЦ20

Designation

Name The value
Designation GOST Cyrillic АЦ20
Designation GOST Latin ATs20
Transliteration ATs20
By chemical elements -

Description

АЦ20 steel is used: for the production of bars intended for the manufacture of automotive components by hot forming with subsequent machining.

Note

Calcium-containing steel of high machinability.

Standards

Name Code Standards
Bars and shapes В32 TU 14-1-3283-81

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu Ca
TU 14-1-3283-81 0.17-0.24 0.035-0.06 ≤0.035 0.35-0.65 ≤0.25 0.17-0.37 ≤0.25 Rest ≤0.25 0.03-0.09
Fe is the basis.
According to TU 14-1-3283-81 the chemical analysis is given for steel grade ATS20. In the designation of steel letters mean: A - automatic, C - calcium. The microalloying of calcium steel is carried out by silicocalcium and other calcium alloys at the rate of introduction of 0.030-0.090% calcium into a liquid metal. The mass fraction of calcium is not determined by chemical analysis. In steel, the mass fraction of arsenic is not more than 0.080%. In steel, smelted with scrap-process, a mass fraction of copper and nickel is allowed up to 0.030% of each. The mass fraction of nitrogen in oxygen-converter steel should not exceed 0.0080%. In finished bars, subject to the requirements of the technical specification, deviations in chemical composition are allowed: by carbon ± 0.010%, for manganese ± 0.030%, for silicon ± 0.020%, for sulfur and phosphorus +0.0050% for each.

Mechanical properties

Section, mm sT|s0,2, MPa σU, MPa d5, % y, %
Bars on the other 14-1-3283-81
≥245 ≥410 ≥25 ≥55

Description mechanical marks

Name Description
sT|s0,2 Yield strength or limit of proportionality with a tolerance for residual deformation of 0.2%
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing

Technological properties

Name The value
Particularities of production of goods Bars on the other 14-1-3283-81 are supplied without heat treatment with hardness ≤163НВ.