According to ISO 898-1, Mechanical pr physical property for class 12.9 is as below:
Tensile strength min 1220 MPa
Stress at 0.2% non-proportional elongation, Rp0.2, min 1100 MPa
Stress under proof load, 970MPa
percentage elongation of area after fracture for machined test pieces, A, 8%
Percentage reduction of area after fracturer for machined test piece, Z, 44%
Vickers hardness, HV, 385 ~ 435
Surface hardness, HV0.3, 435
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Post time: Sep-29-2021