Australian Steel Charpy V-Notch Impact Values — AS/NZS 3679.1

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Reference for Charpy V-notch (CVN) impact testing per AS/NZS 3679.1:2016 and AS 4100:2020 Clause 2.4.5. Covers L0 and L15 designations, minimum absorbed energy, test temperatures.

Designation Temp Min Avg Min Single Application
L0 0°C 27 J 20 J Standard coastal/urban
L15 -15°C 27 J 20 J Alpine, fracture-critical
L20 -20°C 27 J 20 J Special low-temp

Required Charpy by Application

Application Min Designation Clause
Building columns (compression) None required 2.4.5.1
Tension members (ext <0°C) L15 2.4.5.2
Fracture-critical (bridges) L15 2.4.5.3
Seismic ductile members L0 AS 1170.4

Worked Example

Problem: Welded tension member, Jindabyne NSW (min -8°C). Grade 350 plate, 25 mm.

Solution: Per Clause 2.4.5.2: ambient <0°C → L15. Specify Grade 350 L15 (27 J at -15°C). One set of 3 specimens per heat.

Design Resources

FAQ

What is the standard Charpy requirement for Grade 300 steel? L0: min 27 J at 0°C. Grade 300PLUS guarantees 27 J at 0°C for all thicknesses.

When should L15 be specified? Alpine regions, dynamically loaded structures, and tensile stress below -5°C ambient.

What if a Charpy test fails? Retest 3 additional specimens. Failure on retest rejects material per AS/NZS 3679.1 Clause 8.4.


Educational Use Only — This reference is for educational and preliminary design purposes only. All structural designs must be independently verified by a licensed Professional Engineer (PE) or Structural Engineer (SE) in accordance with AS 4100:2020 and all applicable Australian Standards. Results are not for construction.