Steel 8X3

Designation

Name The value
Designation GOST Cyrillic 8Х3
Designation GOST Latin 8X3
Transliteration 8H3
By chemical elements 8Cr3

Description

8X3 steel is used: for the manufacture of tools (punches, matrices), a hot landing fasteners and blanks made of carbon and low-alloy construction steels in the horizontal forging machines; parts of dies (dies, punches, ejectors) for hot pressing and extruding of these materials on crank presses with small-scale production; bending, trimming and cutting dies.

Standards

Name Code Standards
Bars and shapes В22 GOST 1133-71, GOST 2590-2006, GOST 2591-2006
Sheets and strips В33 GOST 4405-75
Bars and shapes В32 GOST 5950-2000, GOST 7417-75, GOST 8559-75, GOST 8560-78, GOST 14955-77, TU 14-11-245-88
Blanks. Of the workpiece. Slabs В31 OST 24.952.01-89

Chemical composition

Standard C S P Mn Cr Si Ni Fe Cu V Ti Mo W
GOST 5950-2000 0.75-0.85 ≤0.03 ≤0.03 0.15-0.45 3.2-3.8 0.1-0.4 ≤0.4 Rest ≤0.3 ≤0.15 ≤0.03 ≤0.2 ≤0.2
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. Quenching in oil from 870 °C to + Leave at 500 °C (2H exposure)
- ≥1270 ≥1340 ≥8 ≥25 ≥343 -
Long products (samples). Quenching in oil from 870 °C to + Leave (exposure 2 hours)
- 300 ≥1800 ≥1980 ≥3 - - ≥55
Long products (samples). Quenching in oil from 870 °C to + Leave at 500 °C (exposure 2 hours)
- - ≥1080 ≥1270 ≥8 ≥27 - -
Rolled steel. - Heat to 650-700 °C. Quenching in oil with 820-850 °C + Vacation at 480-550 °C (aging 1 HR)
- 1420-1520 1470-1570 6-9 18-20 - 44-48
Long products (samples). Quenching in oil from 870 °C to + Leave (exposure 2 hours)
- 400 ≥1630 ≥1710 ≥6 ≥10 - ≥52
Long products (samples). Quenching in oil from 870 °C to + Leave at 500 °C (exposure 2 hours)
- - ≥1030 ≥1220 ≥10 ≥28 - -
Long products (samples). Quenching in oil from 870 °C to + Leave (exposure 2 hours)
- 500 ≥1270 ≥1340 ≥8 ≥25 - ≥44
Long products (samples). Quenching in oil from 870 °C to + Leave at 500 °C (exposure 2 hours)
- - ≥930 ≥1110 ≥15 ≥47 - -
- - ≥640 ≥800 ≥20 ≥65 - -

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)

Technological properties

Name The value
The temperature of forging Start - 1160 °C, the end - of 800 °C. slow Cooling in the wells.