X12CrNiMo12 Bar for highly loaded Blades/Vanes
December 19,2023
Part / Bauteil
Bar for highly loaded Blades /Vanes (ESR)
Material designation: X12CrNiMo12 + QT900 / Material - No. 1.4939 +QT900
Delivery condition
Forged or rolled , quenched and tempered , stress relieved after bending
Terms of delivery LW 1.4939
Similar materials: AMS 5719 / 1.4938, X12CrNiMoV12-3
Heat analysis %
| C | Si | Mn | P | S | Cr | Mo | Ni | V | N |
|---|---|---|---|---|---|---|---|---|---|
| 0.08-0.13 | max 0.35 | 0.50-0.90 | max 0.025 | max 0.005 | 11.00-12.50 | 0.80-1.20 | 2.00-3.00 | 0.25-0.40 | 0.02-0.04 |
Mechanical Properties - longitudinal , RT
| 0.2%-proof strength (N/mm2) | tensile strength | elongation | reduction of area | impact energy | hardness |
|---|---|---|---|---|---|
| min 785 | 900-1100 | min 14 | for information | min 40 |
Fabrication method: ESR ( Electro Slag Remelted )
Test specimen
Location : center of cross -section ; One tensile test and one set for impact test of the hardest and softest bar of each batch (=same melt + production batch + heat treatment batch )
Heat treatment
Quenched and tempered to QT900 , minimum tempering temperature : 640 ° C . After quenching the part needs to be cooled long enough to ensure that the martensitic transformation of the microstructure is completed . Stess relieving after bending . Stress relieve temperature : 30-50 °C below last tempering temperature. Min . holding time for tempering and stress relieving : 2 minutes / mm of bar thickness or . diameter It shall be guaranteed that the microstructure is quenched and tempered and homogeneous over the entire cross - section .