Table 1.

Chemical composition of investigated steels (wt.%).

X153CrMoV12	C	Si	Mn	Cr	Mo	V
min–max	1.45–1.60	0.10–0.40	0.20–0.60	11.00–13.00	0.70–1.00	0.70–1.00
Spectral analysis	1.53	0.35	0.40	12.00	1.00	1.00
X37CrMoV5-1	C	Si	Mn	Cr	Mo	V
min–max	0.33–0.41	0.8–1.2	0.25–0.5	4.8–5.5	1.1–1.5	0.3–0.5
Spectral analysis	0.37	0.88	0.35	5.10	1.35	0.40
X45NiCrMo4	C	Si	Mn	Cr	Mo	Ni
min–max	0.40–0.50	0.10–0.40	0.15–0.45	1.20–1.50	0.15–0.35	3.80–4.30
Spectral analysis	0.45	0.25	0.35	1.35	0.25	4.05