UNI · 671 grades

UNI steel grades — 671 designations — Page 5

Every grade designated under UNI, with the material number it maps to, what kind of steel it is, its carbon window and how many other standards carry it. Open a grade for its full composition, properties and its designations in other standards. Every name on this page is an indicative cross-reference, not an asserted identity: the grades are close, not interchangeable. Check the composition before you substitute.

Also known as

671 designations

Grade	Material no.	Category	C% by weight	Also inother standards
C28Mn	1.1165	Quenched and tempered steels	0.25–0.32	16
C30	1.0528	Quenched and tempered steels	0.27–0.34	14
C30E	1.0528	Quenched and tempered steels	0.27–0.34	14
C30R	1.0528	Quenched and tempered steels	0.27–0.34	14
C35	1.1181	Quenched and tempered steels	0.32–0.39	20
C35	1.1180	Quenched and tempered steels	0.32–0.39	11
C35	1.0501	Quenched and tempered steels	0.32–0.39	23
C35C	1.0501	Quenched and tempered steels	0.32–0.39	23
C35E	1.0501	Quenched and tempered steels	0.32–0.39	23
C35R	1.0501	Quenched and tempered steels	0.32–0.39	23
C36	1.1183	Steels for surface hardening	0.33–0.39	7
C36	1.0501	Quenched and tempered steels	0.32–0.39	23
C36KU	1.1545	Unalloyed tool steels / carbon steels	1–1.1	19
C38	1.0501	Quenched and tempered steels	0.32–0.39	23
C40	1.1186	Quenched and tempered steels	0.37–0.44	16
C40	1.1189	Quenched and tempered steels	0.37–0.44	8
C40	1.0511	Quenched and tempered steels	0.37–0.44	21
C40E	1.0511	Quenched and tempered steels	0.37–0.44	21
C40R	1.0511	Quenched and tempered steels	0.37–0.44	21
C43	1.0503	Quenched and tempered steels	0.42–0.5	24
C45	1.1201	Quenched and tempered steels	0.42–0.5	11
C45	1.1191	Quenched and tempered steels	0.42–0.5	21
C45	1.1191	Others	0.42–0.5	18
C45	1.1730	Unalloyed tool steels / carbon steels	0.42–0.5	14
C45	1.0503	Quenched and tempered steels	0.42–0.5	24
C45E	1.0503	Quenched and tempered steels	0.42–0.5	24
C45E	1.0912	Others	0.42–0.5	11
C45R	1.0503	Quenched and tempered steels	0.42–0.5	24
C46	1.0503	Quenched and tempered steels	0.42–0.5	24
C50	1.1206	Quenched and tempered steels	0.47–0.55	17
C50	1.1241	Steels for surface hardening	0.47–0.55	8
C50	1.1203	Quenched and tempered steels	0.52–0.6	15
C50	1.0535	Quenched and tempered steels	0.52–0.6	21
C50	1.0540	Quenched and tempered steels	0.47–0.55	13
C50E	1.0540	Quenched and tempered steels	0.47–0.55	13
C50E	1.0586	Steels for surface hardening	0.48–0.53	7
C50E	1.1213	Steels for surface hardening	0.5–0.57	11
C50E	1.1241	Steels for surface hardening	0.47–0.55	8
C50E	1.9505	Steels for surface hardening	0.48–0.55	6
C50E	1.0535	Quenched and tempered steels	0.52–0.6	21
C50R	1.0535	Quenched and tempered steels	0.52–0.6	21
C53	1.1213	Steels for surface hardening	0.5–0.57	11
C53	1.0535	Quenched and tempered steels	0.52–0.6	21
C55	1.1203	Quenched and tempered steels	0.52–0.6	15
C55	1.1209	Others	0.52–0.6	8
C55	1.0535	Quenched and tempered steels	0.52–0.6	21
C55E	1.0535	Quenched and tempered steels	0.52–0.6	21
C55R	1.0535	Quenched and tempered steels	0.52–0.6	21
C60	1.1223	Quenched and tempered steels	0.57–0.65	4
C60	1.1221	Quenched and tempered steels	0.57–0.65	18

This grade’s own name — recorded in our sources as this grade’s own designation under that standard.
Indicative — taken from a published cross-reference table; a close match, not a guarantee of interchangeability. Verify against the mill certificate before ordering.
Withdrawn — designation no longer current — a separate column from the two above, so a name can be same grade and withdrawn at once.