9SiCr

Data verified

9SiCr is a Chinese low-alloy tool steel (GB/T 1299, of the Russian 9KhS lineage): silicon raises the tempering resistance and chromium the hardenability, giving an economical oil-hardening die steel with good edge life.

Hardness58–63 HRC

DIN1.2108 (90CrSi5, near)

GB9SiCr (GB/T 1299)

CategoryTool Steel

Chemical composition

Element	Content (%)
C	0.85–0.95
Si	1.20–1.60
Mn	0.30–0.60
Cr	0.95–1.25

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

Properties

Delivery condition	Annealed
Hardness (hardened)	58–63 HRC
Density	7.85 g/cm³

Heat treatment

Oil quench 860–880 °C; temper 180–220 °C. Low distortion for an oil-hardening grade.

Equivalent grades

Standard	Designation
din	1.2108 (90CrSi5, near)
gb	9SiCr (GB/T 1299)

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

Applications & Processing

Applications: Thread rolling dies, cold punches and dies, reamers, broaches, measuring tools.

Processing: Oil hardening is far gentler than the water hardening of T8/T10 — the standard upgrade where cracking or distortion appears.

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Source: GB/T 1299 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.