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) |
