Selection of the head design thickness at the critical material thickness value
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Let’s discuss this: for the head material 15CrMoR, the forming thickness is 95 mm while the blank thickness is 110 mm. At a thickness of 60–100 mm, the allowable stress is 140 MPa at 250 degrees; whereas for thicknesses greater than 100 mm, the allowable stress is 133 MPa. Personally, I think 133 MPa is the appropriate value to use
This allowable stress should be 133, I think it should be based on the allowable stress specified when selecting the material. Additionally, from a conservative perspective, I also think the smaller value should be chosen.
The allowable stress is based on the nominal thickness of the steel plate before it is shaped. So it’s 133
133 is a more reasonable choice, after all, the size of the rough product is larger
Based on the allowable stress for the material thickness, 133 is a reasonable value to use