Steel 20Г2Р

Designation

Name The value
Designation GOST Cyrillic 20Г2Р
Designation GOST Latin 20G2P
Transliteration 20G2R
By chemical elements 20Mn2B

Description

20Г2Р steel is used: for the manufacture of high strength fasteners by cold forging.

Note

Steel boron alloy. Hot rolled and gorjachekatannyj rental comes with standard hardenability.

Standards

Name Code Standards
Bars and shapes В32 TU 14-1-4486-88, TU 14-1-5490-2004

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu N Al B
TU 14-1-5490-2004 0.2-0.25 ≤0.015 ≤0.02 0.9-1.3 0.15-0.3 ≤0.17 ≤0.1 Rest ≤0.1 ≤0.01 0.02-0.05 0.002-0.005
Fe is the basis.
According to TU 14-1-5490-2004, the chemical composition is given for steel grade 20G1R.

Mechanical properties

σU, MPa d5, % y, % HRC
The hot rolled gorjachekatannyj. Without heat treatment delivery condition
≤620 ≥25 ≥55 -
The hot rolled gorjachekatannyj. Heating for quenching to 900 °C, exposure for 1 h, cooling in oil at a temperature of 40-80 °C (cooling time 7-8 min., time of sample transfer from the furnace to the quenching tank is not more than 5 seconds) + holiday: temperatures up to 450 °C (aging 50 min, excluding the time of heating), air cooling (HRC hardness in the Central zone after quenching, after quenching with tempering)
≤560 ≥28 ≥60 ≥38/28

Description mechanical marks

Name Description
σU Limit short-term strength
d5 Elongation after rupture
y The relative narrowing
HRC Rockwell hardness (indenter diamond spheroconical)