Grades · Alloy & Engineering Steel · 40Cr

40Cr

Data verified

40Cr is China’s most-used alloy structural steel (GB/T 3077) — a Cr steel equivalent to AISI 5140 and JIS SCr440, stocked everywhere in China as round bar.

Hardness28–38 HRC typical

DIN1.7035 (41Cr4)

AISI5140

JISSCr440

CategoryAlloy & Engineering Steel

Chemical composition

Element	Content (%)
C	0.37–0.44
Si	0.17–0.37
Mn	0.50–0.80
Cr	0.80–1.10

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

Properties

Hardness (Q&T)	28–38 HRC typical
Tensile strength	≥980 MPa (Q&T reference, GB/T 3077)
Density	7.85 g/cm³

Heat treatment

Quench 850 °C oil; temper 520 °C (reference Q&T cycle of GB/T 3077).

Equivalent grades

Standard	Designation
din	1.7035 (41Cr4)
aisi	5140
jis	SCr440
gb	40Cr

Compare side by side: 40Cr vs 5140

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

Applications & Processing

Applications: Shafts, gears, bolts, tie rods, hydraulic piston rods.

Processing: As 5140. The standard Chinese offer for export round bar programs.

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Source: GB/T 3077 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.