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Crankshafts after machining shall undergo 100% safety test of crankshaft body on bending fatigue performance and magnetic flaw detection to guarantee its high safety factor and reliable quality. Safety test of crankshaft body on bending fatigue performance shall ensure safety factor of iron crankshaft higher than 1.6 and of steel crankshaft higher than 1.8. The product employs exquisite thermal treatment technique for overall tempering of steel crankshaft, normalizing treatment of iron crankshaft and quenching or nitriding treatment of crankshaft surface. 100% magnetic flaw detection is required for the crankshaft after machining, followed by demagnetization treatment. It is required that magnetic strength shall be ≤5 gauss.