Recrystallization-based formation of uniform fine-grained austenite structure before polymorphic transition in high-strength steels for Arctic applications

Journal of Materials Science: Materials in Engineering

Table 1 Chemical composition of F620, wt. %

Steel grade	C	Mn	Si	P	S	Cu	Ni	Mo	Cr	Al	Nb	V	Ti	V + Nb + Ti	N	B
F620 (BV^a)	0.18	1.6	0.55	0.025	0.02	1.5	2	1	2	0.015	0.06	0.1	0.2	–	0.02	0.06
F620W (DNV^b)	0.18	1.6	0.1–0.55	0.025	0.025	0.35	0.8	0.08	0.2	0.02	0.02–0.05	0.05–0.1	0.007–0.02	0.12	0.02	–
F620W (Lloyd^c)	0.18	1.6	0.55	0.025	0.025	–	–	–	–	0–0.015	0.02–0.05	0.03–0.1	0.02	0.12	0.02	–
F620W (RMRS^d)	0.18	1.6	0.55	0.025	0.025	–	–	–	–	–	–	–	–	–	0.02	–
F620W with V (TU^e)	0.08–0.10	0.3–0.6	0.17–0.37	–	–	Cu + Ni: 2.2–2.9		Mo + Cr: 0.55–1.05		–	–	0.01–0.03	–	–	–	–
F620W with Nb (TU^e)	0.08–0.10	0.3–0.6	0.17–0.37	–	–	Cu + Ni: 2.2–2.9		Mo + Cr: 0.55–1.05		–	0.01–0.03	–	–	–	–	–