Discussion: With the same material, why are the mechanical properties of forgings much worse than those of studs?
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Good afternoon, everyone! ! ! I have a question for the experts here~ For the same materials as specified in GB150, the mechanical properties of \"forgings\" are much worse than those of \"studs\"! Why is this? Is it because of the different heat treatment conditions? Is the forging in the normalized state? And are the studs quenched and tempered?
What is its relationship with the safety factor?
Aren’t you talking about the allowable stress?
“The mechanical properties of “forgings” are much worse than those of “stud bolts”………… How should this sentence be understood? Could the poster make their question clearer?
The mechanical properties of a material are also related to its thickness; for the same material, different thicknesses result in different mechanical properties
Under the same conditions for allowable stress, studs are lower than carbon steel. Reason: The stud has a high safety factor. Why must the safety factor for fasteners be higher than that of other materials? Explanation of GB150, P41.
I thought I was the only one who didn’t understand the topic.
According to B/T150.2-2011, the allowable stress for S30408 forgings at 20°C is 137 MPa; for S30408 studs, it is 128 MPa at 20°C, and for S30408 sheets, it is also 137 MPa at 20°C. How can it be said that the mechanical properties of forgings are much worse than those of studs! Carbon steel is not the same material, nor is it a different heat treatment state. How to compare? Let concrete data speak for itself.