Posted by Oliver 500 Wa on April 03, 2018 at 11:54:15 from (73.96.106.174):
In Reply to: Chinese bolts? posted by rrman61 on April 02, 2018 at 12:53:51:
The chart shows the grade 8 bolt is spec'd to be made of "Medium Carbon Steel". Here is a clip of the range of material that can be defined as Medium Carbon Steel.
Medium Carbon Steel – Composition of 0.29%-0.54% carbon, with 0.60%-1.65% manganese. Medium carbon steel is ductile and strong, with long-wearing properties.
Of particular interest is the 1% swing in allowable manganese. Manganese improves the wear resistance of steel substantially. So if you get a grade 8 bolt that was made with the manganese content near the upper allowable limit it will be noticeably more wear resistant than a grade 8 bolt made from steel near the low limit of manganese.
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