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UNI 7846 18CrMo4 vs EN ISO 683-17 20CrMo4

Close Alternative — 80% match based on chemical composition and mechanical property overlap.

UNI 7846 18CrMo4 (UNI 7846:1978) and EN ISO 683-17 20CrMo4 (EN ISO 683-17:2014) are both steel grades. Both fall under the Alloy Steel category. UNI 7846 18CrMo4 is typically used for used in gears, shafts, pinions, crankshafts, axles, and heavy machinery components., while EN ISO 683-17 20CrMo4 is commonly used for used in gears, shafts, axles, high-tensile bolts, and structural components.. UNI 7846 18CrMo4 is defined under Ente Nazionale Italiano di Unificazione (UNI), originating from Italy, while EN ISO 683-17 20CrMo4 is defined under European Standard (EN), originating from Europe.

As per chemical composition, UNI 7846 18CrMo4 vs EN ISO 683-17 20CrMo4 is a 89.6% match. As per mechanical properties, the match is 60.8%. Combined, this makes them a close alternative overall at 80%.

Frequently Compared With UNI 7846 18CrMo4:
GB/T 3077 12Cr2Ni4A UNI 11234 100Cr6 NF A35-565 100C6 GOST 4543 12HN3A IS 4367 07Cr4Mo6 IS 1570 (Part 4) 103Cr6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 7) 10Cr36Mo10H IS 4367 10Cr9Mo10 IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Cr20Mo6
Match Breakdown
CHEMISTRY MATCH
89.6%
MECHANICAL MATCH
60.8%
OVERALL
80%
Specifications
Property UNI 7846 18CrMo4 EN ISO 683-17 20CrMo4
Standard UNI 7846:1978 EN ISO 683-17:2014
Category Alloy Steel Alloy Steel
C (%) 0.15-0.21 0.18-0.23
Si (%) 0.15-0.40 <=0.40
Mn (%) 0.60-0.90 0.60-0.90
Cr (%) 0.90-1.20 0.90-1.20
Mo (%) 0.15-0.30 0.15-0.25
P (%) 0.035 max <=0.035
S (%) 0.035 max <=0.035
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property UNI 7846 18CrMo4 EN ISO 683-17 20CrMo4
Tensile Strength 700-900 MPa 700-850 MPa
Yield Strength 540 MPa min 500 MPa min
Elongation 14% min 14% min
Hardness 200-260 HB 207-248 HB
Typical Applications
UNI 7846 18CrMo4
Used in gears, shafts, pinions, crankshafts, axles, and heavy machinery components.
EN ISO 683-17 20CrMo4
Used in gears, shafts, axles, high-tensile bolts, and structural components.
Can UNI 7846 18CrMo4 Be Substituted With EN ISO 683-17 20CrMo4?
UNI 7846 18CrMo4 and EN ISO 683-17 20CrMo4 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.
Forms & Sizes Available on M-EX
UNI 7846 18CrMo4
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–5400 mm (204.72–212.6 in)
EN ISO 683-17 20CrMo4
Round Bar → (2 listings)
Diameter: 50–50 mm (1.97–1.97 in)
Length: 5200–6400 mm (204.72–251.97 in)
On M-EX Right Now
UNI 7846 18CrMo4
2 active listings and RFQs →
EN ISO 683-17 20CrMo4
2 active listings and RFQs →
Frequently Asked Questions
What is the difference between UNI 7846 18CrMo4 and EN ISO 683-17 20CrMo4?
Both grades share a similar composition profile; see the specification table above for the exact chemistry and mechanical property values.
Can UNI 7846 18CrMo4 be substituted with EN ISO 683-17 20CrMo4?
UNI 7846 18CrMo4 and EN ISO 683-17 20CrMo4 are a close alternative rather than a direct substitute. Some properties overlap well, but check the specific chemistry and mechanical rows above against your application's requirements before treating them as interchangeable.