UNI · 671 grades

UNI steel grades — 671 designations — Page 3

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
38Cr4	1.7034	Quenched and tempered steels	0.34–0.41	23
38Cr4KB	1.7034	Quenched and tempered steels	0.34–0.41	23
38CrMn4KB	1.7034	Quenched and tempered steels	0.34–0.41	23
38CrMo4KB	1.7225	Quenched and tempered steels	0.38–0.45	25
38NCD4	1.6510	Others	0.35–0.43	7
38NiCrMo4	1.6511	Quenched and tempered steels	0.32–0.4	18
38NiCrMo4KB	1.6511	Quenched and tempered steels	0.32–0.4	18
38NiCrMo4KB	1.6510	Others	0.35–0.43	7
39NiCrMo3	1.6510	Others	0.35–0.43	7
3CD5	1.0314	Unalloyed structural steels	≤ 0.03	14
3CD6	1.0314	Unalloyed structural steels	≤ 0.03	14
3CD65	1.0612	Others	0.63–0.68	12
3CD85	1.1269	Spring steels	0.8–0.9	14
40 NiCrMo 7	1.6562	Quenched and tempered steels	0.37–0.44	10
40 NiCrMo 7	1.6745	Others	0.37–0.43	4
40 NiCrMo 7	1.6565	Quenched and tempered steels	0.35–0.45	15
40CrMnMo7	1.2311	Tool steels for cold work	0.35–0.45	12
40NiCrMo2	1.6546	Quenched and tempered steels	0.37–0.44	14
40NiCrMo2(KB)	1.6546	Quenched and tempered steels	0.37–0.44	14
40NiCrMo7	1.6511	Quenched and tempered steels	0.32–0.4	18
41Cr4	1.7039	Quenched and tempered steels	0.38–0.45	13
41Cr4	1.7035	Quenched and tempered steels	0.38–0.45	18
41Cr4	1.7034	Quenched and tempered steels	0.34–0.41	23
41Cr4KB	1.7034	Quenched and tempered steels	0.34–0.41	23
41CrAiMo7	1.8509	Nitriding steels	0.38–0.45	16
41CrAlMo7	1.8509	Nitriding steels	0.38–0.45	16
41CrMo4	1.7223	Steels for surface hardening	0.38–0.44	13
42CrMo4	1.7227	Quenched and tempered steels	0.38–0.45	15
42CrMo4	1.7225	Quenched and tempered steels	0.38–0.45	25
44NiCrMoV7-KU	1.2714	Tool steels for hot work	0.5–0.6	15
44NiCrMoV7KU	1.2711	Tool steels for cold work	0.5–0.6	16
45NiCrMo16KU	1.2767	Tool steels for cold work	0.4–0.5	9
45WCrV8KU	1.2542	Tool steels for cold work	0.4–0.5	12
48Si7	1.8159	Quenched and tempered steels	0.47–0.55	27
48Si7	1.7102	Spring steels	0.51–0.59	14
50CrV4	1.8159	Quenched and tempered steels	0.47–0.55	27
51CrMnV4KU	1.8159	Quenched and tempered steels	0.47–0.55	27
51CrV4	1.8159	Quenched and tempered steels	0.47–0.55	27
55Cr3	1.7176	Spring steels	0.52–0.59	18
55NiCrMoV7KU	1.2711	Tool steels for cold work	0.5–0.6	16
55NiCrMoV7KU	1.2714	Tool steels for hot work	0.5–0.6	15
55Si7	1.5026	Spring steels	0.52–0.6	20
55Si8	1.5026	Spring steels	0.52–0.6	20
55WCrV8KU	1.2550	Tool steels for cold work	0.55–0.65	15
55WCrV8KU	1.2542	Tool steels for cold work	0.4–0.5	12
56NiCrMoV7-KU	1.2714	Tool steels for hot work	0.5–0.6	15
60Si7	1.0961	High-strength multi-phase steels	≤ 0.18	14
60Si7	1.5028	Spring steels	0.6–0.7	11
60Si7	1.5027	Spring steels	0.56–0.64	11
60SiCr8	1.0961	High-strength multi-phase steels	≤ 0.18	14

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.