How to know if steel bar is not substandard?

[angelo]

As the title says. How can u detect or know if the one you bought is not substandard?

[Boybakal]

Steel bars have their corresponding weight

10mm = 3.3-3.5kilos per pc of 20 ft
12mm = 4.9-5.1kilos per pc of 20 ft
16mm = 8.9-9.1kilos per pc of 20 ft

if you feel you got cheated try weighing them
but be aware some are standard in look but some are made brittle
called asero in tagalog you cant bend those kinds mababali agad that comes from china hope this help

[bbn]

Great post bro. I've done a lot of DIY work with rebars but I honestly never bothered to check. I think I never did get any of the "asero" kind but knowing how to tell is still good to know. Also, I believe most of the hardware stores will actually tell a buyer that what they have is "undersized" but this does not necessarily mean it is low quality steel or "asero". Note DIYers though that a rebar with an actual smaller diameter than its label will surely have less strength that what it is thought to have. Most designers, especially in our country, will factor this situation into their safety factors. Best to ask your architect or civil engineer about this.

Not every DIYer will have an appropriate weighing scale, one that can weigh down to the 0.1 kg. Bathroom scales I think have a 0.2kg resolution. What a DIYer can do is to weight several bars at the same time then dividing the reading by the number of bars to get the weight per piece. This will get one around resolution limitation, and also gives an average weight value which eliminates any normal variations. If the average is out of the ranges bro boybakal gave us then in all likelihood the bars are substandard.

[guad]

What width (nominal or actual) of steel bar do those weights assume? Is there only one width of steel bar that is commonly available?