Y15

Data verified

Y15 is the higher-carbon companion of Y12 in China’s sulfur-phosphorus free-cutting family (GB/T 8731): the same low-silicon, high-sulfur, high-phosphorus concept with carbon raised to 0.10–0.18% and manganese to 0.80–1.20% for somewhat better strength.

AISI1215 (near)

JISSUM family (near)

GBY15 (GB/T 8731)

CategoryCarbon Steel

Chemical composition

Element	Content (%)
C	0.10–0.18
Si	≤0.15
Mn	0.80–1.20
P	0.08–0.15
S	0.23–0.33

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Tensile strength	410–530 MPa (hot rolled, typ.)
Density	7.85 g/cm³

Heat treatment

Used as-rolled or cold drawn; no hardening response.

Equivalent grades

Standard	Designation
aisi	1215 (near)
jis	SUM family (near)
gb	Y15 (GB/T 8731)

Compare side by side: Y15 vs Y12 · Y15 vs Y20 · Y15 vs 1215

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Standard fasteners, turned fittings, small shafts and hardware across Chinese automatic-lathe shops.

Processing: Excellent machinability; not weldable; keep out of structural and pressure service.

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Source: GB/T 8731 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.