How does this happen?

Oct 28, 2018
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I took apart the headtube on my mixte, and I noticed that half of the steerer tube was eaten away. The little crater holes confuse me even more. I am going to replace this fork.
20191020_120535.jpg
 
Aug 14, 2019
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It looks like something got into the head tube and was grinding into the surface. Was it working smoothly?

Judging by the pic, it doesn't look like it needs to be replaced to me.
 
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Jul 27, 2019
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Some forks have marks embossed on them with build dates and such. This might be destroying the evidence of something?
 
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Jun 13, 2015
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I've seen that on other forks and never had an issue. I'm pretty sure it's something that happens during the manufacturing process, but I can't figure out what.
 
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Oct 5, 2015
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The grinding may happen when something, like a foreign object, or a ball bearing, or part of a bearing cage, gets in-between the fork tube and the head tube. Gravity usually pulls what ever it is toward that bottom cup. Another cause could be loss of bottom bearings or a bent fork tube, (but that does not look to be the case). Another cause could be the joints inside the head tube interfering with normal turns of the steering. It could use a brush of some red primer.
 
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