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18HGT

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CARBURISING STRUCTURAL STEEL

NORM: PN-89/H-84030/02

APPLICATION:

Steel susceptible to loaded parts with a high core strength. Especially for gear wheels and shafts.

TECHNOLOGICAL INFORMATION:

The steel can be welded before carburising, but after pre-heating.

SEMI-FINISHED PRODUCTS:

The steel can be welded before carburising, but after pre-heating.

CHEMICAL COMPOSITION:

CMnSiPSCrNiMoWVTiCu
0,17 - 0,230,80 - 1,100,17 - 0,37Max 0,035Max 0,0351,00 - 1,30Max 0,30-Max 0,20Max 0,050,05 - 0,12Max 0,30

MECHANICAL PROPERTIES:

Property Symbol Unit Value
Ultimate tensile strength Rm MPa ≥ 980
Yield stress Re (Rp0.2) MPa ≥ 830
Elongation A % ≥ 9
Reduction of area Z % ≥ 50
Impact energy KV J ≥ 80
Hardness after soft annealing – HB ≤ 217

Technological treatment processes:

Technological treatment processes Possible application Temperature, °C
Hot forming Forging + 1100 – 850
Rolling + 1100 – 850
Thermochemical treatment Carburising + 880 – 950
Carbonitriding + 860 – 930
Heat treatment Annealing Normalising + 880 – 900
Soft annealing + 650 – 700
Heat treatment after carburising1) Core hardening + 850 – 880
Intermediate annealing + 660 – 680
Case hardening + 810 – 830
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 CEN Russia
– – – – ~18ChGT GOST 4543-71
US Japan China
– – – – – –