3/8" or 1/2" steel ball bearing, clear acrylic tube with an ID just a bit bigger than the ball, about 12" long. "V" the bottom of the tube to nest on the OD of the bar. Drop the bearing from the top of the tube onto some inner section of the bar, mark the rebound. Do it a few times for consistency. Then do the same on the end of the bar.
If the bar is crudded up with grease or scale, remove before testing. Ideally the test surfaces are clean and smooth, as identical in surface finish and form as you can find.
Not a replacement for a proper hardness tester, but OK for direct comparisons.
I take it back. You can't read. Or maybe it's comprehension you have issues with. Because at least half my posts are specific to technical aspects of manufacturing. When I do go political it's frequently in rebuttal to people who were bootlicking the previous prez. The one who lost, then tried to overturn the election by force.
I realize this is a hopeless plea, but I would like to stick on the topic of hard 1045 bar ends, and reserve the political discussions for one of the many threads that have 50 to 250 pages on political topics.
And all the one-on-one animosity can go someplace else, for once.
It’s not clear in the OP, were the hard ends Nucor bars? If so I would suspect the consistency of the steel. Lot of recycle steel, at least out of the Norfolk plant, and it’s pretty well known that the non virgin Nucor steel can have some inconsistencies. Why just the ends? I don’t know.
That's the rub - if it is just the ends, it sort of has to be how they're cutting them. They're not rolling short segments, these are cut from longer rolled lengths. So either a thermal process or mechanical strain is changing the metallurgy at the ends.
Yeah..............not sure why they are that hard? I mean it's 1045 after all...............how could there be enough carbon in it? And it's not just a thin crust..........Some hunks I had the hardness was quite deep............1/4"+
1045 has a higher carbon content then even 4140. Not by much. Nonetheless, 1045 doesn’t have all the other alloying elements that make 4140 a much better alloy steel. I grew up as a kid running CNC lathes, and I have personally ran hundreds of thousands of spindles for agricultural equipment from a similar material, 10V45. The V is for a vanadium alloying element. The hot roll bar stock was always sawed about 1/2” off the ends because it was very rarely NOT hard. I always assumed it was because of the way it was cut during the steel mill process, and the ends maybe cooled too quickly? Our 10V45 would usually hardness test at low 10’s HrC. Or as high as 25-34 HrC. But the fact that it can get really hard, not necessarily strong is the same reason 4340 and 4140 can get hard. Carbon content.
Also why does everyone just love to argue about which way the wind is blowing? I’m 31 years old, and I know most of you are much older then me, yet a lot here act like children.
Standard inserts for steel........................I once tried to chew threw a mill cut 1045 end, it didn't end well..................Thought I could get through the "crust".............crust was over 1/2" thick. I now always trim the bar end even though it looks a nice square saw cut edge....................just finished up a fair bit of 4140 HR material.....................none of the ends were hard and cut just like the rest of the bar...............