20HG/1.7147/20MnCr5

CARBURISING STEEL

NORM: PN/EN 10084

APPLICATION:

Alloyed case hardening steel for the parts which require high core tensile strength and high hardness. Susceptible to average seized parts with high wearing resistance and variable loading such as: gears, screws, bolts, bushing, camshafts.

TECHNOLOGICAL INFORMATION:

Steel adjusted for cutting with a cutting machine. The carburising temperature range can be higher than provided in the file (depending on the carburising process)

SEMI-FINISHED PRODUCTS:

Steel adjusted for cutting with a cutting machine. The carburising temperature range can be higher than provided in the file (depending on the carburising process)

CHEMICAL COMPOSITION:

CSiMnPSCrMoNiB
0,17 – 0,22Max 0,401,10 – 1,40Max 0,025Max 0,0351,00 – 1,30---

MECHANICAL PROPERTIES:

Hardness after Symbol Value
Soft annealing (+A) HB ≤ 217
Heat treatment (carburising, quenching and tempering) (+QT) HRC ≥ 60
Ultimate tensile strength Rm, after quenching and tempering at 200 °C:
Diameter, d, mm d ≤ 16 16 < d ≤ 40 40 < d ≤ 100
Rm, MPa 1200 950 750

PHYSICAL PROPERTIES:

Property Unit Value
Density, ρ g·cm-3 7.85

HARDENABILITY:

EN10084:2008

Jominity test HRC mm (mm distance from quenched end)

1.5 3 5 7 9 11 13 15 20 25 30 35 40
max. 49 49 48 46 43 42 41 39 37 35 34 33 32
min. 41 39 36 33 30 28 26 25 23 21

Technological treatment processes:

Technological treatment processes Possible application Temperature, °C
Hot forming Forging + 1150 – 850
Rolling + 1150 – 850
Thermochemical treatment Carburising + 880 – 980
Carbonitriding + 860 – 950
Heat treatment Annealing Normalising + 870 – 910
Soft annealing + 650 – 700
Heat treatment after carburising1) Core hardening + 860 – 900
Intermediate annealing + 670 – 720
Case hardening + 780 – 820
Tempering + 150 – 200
1) If possible, hardening has to be performed with the temperature equal or close to the heat treatment temperature

INTERNATIONAL STEEL GRADES:

ISO EN Russia
20MnCr5 ISO 683-11:1987 20MnCr5 EN 10084:1998
US Japan China
~5120 ASTM A 322-91 ~20CrMn GB 3077-88