The precision mold base retains a small amount of residual austenite and can relax the stress as needed, which acts as a buffer. Because the residual austenite is soft and tough, it can partially absorb the rapid expansion energy of martensitization and ease the transformation stress; take it out after cold treatment Putting the mold base into hot water to heat up can eliminate 40%-60% of the cold treatment stress. After warming to room temperature, it should be tempered in time to further eliminate the cold treatment stress, avoid the formation of cold treatment cracks, obtain stable tissue properties, and ensure that the mold base products are stored and used. No distortion occurs.