Russia · GOST

17G1S

GOST 5520:1979 — GOST 5520

Chemical composition

Element	min	max	Similar	Remarks
As		0.08
C	0.15	0.2
Cr		0.3
Cu		0.3
Mn	1.15	1.6
N		0.008	In EAF steels it is permitted N=max 0.012%.	In EAF steels it is permitted N=max 0.012%.
Ni		0.3
P		0.035
S		0.04
Si	0.4	0.6

Mechanical properties

Heat treatment / condition	Yield strength	Tensile strength	Elongation	Reduction of area	Impact energy	Hardness
sheet, aged , > 10 <= 20 mm	≥345	≥510	≥23		≥29 KCU
sheet, aged , > 5 <= 10 mm	≥355	≥510	≥23		≥29 KCU
sheet, not heat treated, <= 5 mm	≥345	≥510	≥23
sheet, not heat treated, > 10 <= 20 mm	≥345	≥510	≥23
sheet, not heat treated, > 5 <= 10 mm	≥355	≥510	≥23

High/low temperature

Yield strength Rp0.2 (MPa)

Condition	Temperature ℃	Approx.
sheets heat treated	450	176
sheets heat treated	400	176
sheets heat treated	350	206
sheets heat treated	300	225
sheets heat treated	250	245
sheets heat treated	200	265