Steel 55KHGR

Designation

Name The value
Designation GOST Cyrillic 55ХГР
Designation GOST Latin 55XGP
Transliteration 55HGR
By chemical elements 55CrMnB

Description

55KHGR steel is used: for the manufacture of spring steel strip thickness 3,0−24,0 mm.

Note

Steel spring alloy quality.

Standards

Name Code Standards
Sheets and strips В23 GOST 103-2006
Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006, GOST 2879-2006
Steel wire medium and high carbon В72 GOST 26366-84
Bars and shapes В32 GOST 7417-75, GOST 7419-90, GOST 8559-75, GOST 8560-78, GOST 14955-77, GOST 14959-79, TU 14-1-2118-77, TU 14-11-245-88, TU 14-136-367-2008

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu B
GOST 14959-79 0.52-0.6 ≤0.035 ≤0.035 0.9-1.2 0.9-1.2 0.17-0.37 ≤0.25 Rest ≤0.2 0.001-0.003
Fe is the basis.

Mechanical properties

Section, mm t отпуска, °C sT|s0,2, MPa σU, MPa d5, % y, % KCU, kJ/m2 HRC
Rolled steel. Steel categories: 3, 3A, 3B, 3C, 3D, 4, 4A, 4B. Quenching in oil from 850 °C + vacation at 470 °C
- ≥1175 ≥1270 ≥7 ≥35 - -
Rolled steel. Hardened in oil from 830 °C to + Vacation
- 350 ≥1760 ≥1910 ≥7 ≥38 ≥500 ≥51
- 400 ≥1620 ≥1810 ≥7 ≥40 ≥530 ≥49
- 450 ≥1420 ≥1570 ≥9 ≥41 ≥579 ≥45
- 500 ≥1180 ≥1370 ≥11 ≥47 ≥696 ≥41
- 550 ≥1080 ≥1180 ≥12 ≥51 ≥834 ≥37

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
KCU Toughness
HRC Rockwell hardness (indenter diamond spheroconical)