Happy to say I work at a steel mill that makes rebar. Most of this tracks but most modern mills roll the deformations(ribs) into the bar while it is still hot in the final stand. This is before it gets quenched to achieve the proper quality’s for the grade ordered. A quick note, rebar sizes from 3-11 grow in 1/8th inch increments 3 bar being 3/8” 4 bar being 1/2” and so on. Most of these sizes can be spooled rather than cut straight so that fab shops can unspool and bend for customization and select lengths to cut down on waste.
In the steel plant I worked at, the deformations were achieved using a final roller that had deformations included. This saved having to reheat the bar again to get the required effect.
That's the standard method for hot-rolled deformed bar, especially when mechanical elongations of 5% or more at maximum load are required. Mesh products are made by taking round rod and rolling the ribs in cold - this increases the strength but the ductility is only 1.5% to 2%.
many years ago i learned about this- after a railroad derailment- i watched the company come and remove the wheels and they left the rest ( box cars etc.) i asked what they would do with them- i was told the would be collected by a scrap company and turned into rebar
35 years ago we used to have more specialised ties with loops at each end and a tool with a hook end and a twisting shaft which when pulled through the loops of wire gave a tight connection when it twisted3 or so times if you can understand that. They way they did it here on massive constructions with thousands of tie points was ridiculous with the tool they used. We only had to do less than 100 each day.
Alot of substandard rebar being sold. I couldn't bend hooks in last batch without cracking fracture etc. Check paperwork on all rebar where it was made and specifications of carbon content. Chinesium metal bad bad bad
You would hope that quality control tests are adequate to make sure the standard is of the highest. When you see some buildings totally collapsing in some Asian countries and others, you wonder if there was any rebar put in at all so someone could make a bigger profit.
Nope! You can make most steel qualities from scrap by using different scrap qualities burning the carbon in the steel adding alloy material. By the way rebar is made of very basic steel qualities.
Some creative and unscrupulous Mainland Chinese manufactures have been uncovered inventing a new type of Rebar....from Plastic !!!!!!!!!!! Imagine what the future holds especially for some unsuspecting high rise apartment owners...Jericho will be dwarfed in comparison.
Happy to say I work at a steel mill that makes rebar. Most of this tracks but most modern mills roll the deformations(ribs) into the bar while it is still hot in the final stand. This is before it gets quenched to achieve the proper quality’s for the grade ordered. A quick note, rebar sizes from 3-11 grow in 1/8th inch increments 3 bar being 3/8” 4 bar being 1/2” and so on. Most of these sizes can be spooled rather than cut straight so that fab shops can unspool and bend for customization and select lengths to cut down on waste.
In the steel plant I worked at, the deformations were achieved using a final roller that had deformations included. This saved having to reheat the bar again to get the required effect.
That's the standard method for hot-rolled deformed bar, especially when mechanical elongations of 5% or more at maximum load are required. Mesh products are made by taking round rod and rolling the ribs in cold - this increases the strength but the ductility is only 1.5% to 2%.
Chia uses old Tootsie-Rolls for rebar.
many years ago i learned about this- after a railroad derailment- i watched the company come and remove the wheels and they left the rest ( box cars etc.)
i asked what they would do with them- i was told the would be collected by a scrap company and turned into rebar
Raising the bar with this banger
A lot of knowledge ❤
That was very interesting. How about a video that details rebar connections. This one only showed manual pliers.
35 years ago we used to have more specialised ties with loops at each end and a tool with a hook end and a twisting shaft which when pulled through the loops of wire gave a tight connection when it twisted3 or so times if you can understand that.
They way they did it here on massive constructions with thousands of tie points was ridiculous with the tool they used. We only had to do less than 100 each day.
How about a video on the sinple history of fireplaces?
Alot of substandard rebar being sold.
I couldn't bend hooks in last batch without cracking fracture etc.
Check paperwork on all rebar where it was made and specifications of carbon content.
Chinesium metal bad bad bad
Rebar and concrete have the same thermal expansion coefficient. If they didn't, the rebar would break apart the concrete.
I was driving from Massachusetts to the Missouri/Kansas line last week.
You bet how is rebar is made crossed my mind during the 1400 mile trip
Very important point... You use metric system!
From my understanding, most of the rebar is made from scrap cast iron and steel, so the steel alloy grade is very questionable from most sources.
Maybe that was in reference to “weldable rebar”? Idk
You would hope that quality control tests are adequate to make sure the standard is of the highest.
When you see some buildings totally collapsing in some Asian countries and others, you wonder if there was any rebar put in at all so someone could make a bigger profit.
No matter what's made from, if final product meets strength regulations and standardization.
Heard that about bed frames as well. From my experience its junk steel.
Nope! You can make most steel qualities from scrap by using different scrap qualities burning the carbon in the steel adding alloy material.
By the way rebar is made of very basic steel qualities.
Do not use rebar coated in plastic or epoxy in critical structures , it dos not offer significant protection against corrosion
They use it in bridges here in ks?
They eliminated that green bar in many projects codes and now often use stainless steel in bridge decks salt water marine etc .
Some creative and unscrupulous Mainland Chinese manufactures have been uncovered inventing a new type of Rebar....from Plastic !!!!!!!!!!!
Imagine what the future holds especially for some unsuspecting high rise apartment owners...Jericho will be dwarfed in comparison.
Local 229 Ironworkers