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15 comments
Anonymous Poster

Weight Formula of a Round Bar

05/17/2007 12:52 AM

what weight of round bar dia140 X 48inch length

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Anonymous Poster
#1

Re: weight formula

05/17/2007 1:45 AM

What material?

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Anonymous Poster
#4
In reply to #1

Re: weight formula

05/18/2007 7:59 AM

You first need to know the density of the material; enter material densities in to www.google.com and you will find web pages that will detail the densities of various materials.

Mass (M) = Density (ρ) . Volume (V)

Voulme of Cylinder = Section Area of Circle multiplied by its Length

Therefore M = ρ x (((pi.d2)/4).L)

Where:

Pi = 3.1416 to 4.d.p

d = Diameter of round bar = you stated 140 is this in inches? If not need to convert

L = Length = 48"

As you are asking for weight and giving dimensions in inches, I assume you will want the weight in lbs, so your density needs to be in lbs per inch cubed (lbs/in3).

Assuming for a typical steel density of 0.2848 lb/in3 to 4.d.p.

Your weight of your bar 140" dia x 48" Long will be:

0.2848 . (((3.1416.1402)/4).48) = 210'439.9lbs

Which is just a little more that the last reply.

But if d is 140mm (5.51") like the reply before that.

Your weight will be 0.2848.(((3.1416.5.512)/4).48) = 325.968lbs

Values will vary for small variations used in densites.

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Anonymous Poster
#14
In reply to #1

Re: weight formula

12/24/2009 4:43 AM

din17200

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Anonymous Poster
#15
In reply to #1

Re: Weight Formula

04/21/2010 7:05 AM

Electrical Cable Weight

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#2

Re: weight formula

05/17/2007 6:17 AM

Assuming the dimensions are dia = d = 140mm [?], length = L = 48" = 1219.2mm and the material is carbon steel with density = R = 7870kg/m^3

Then mass of bar = Volume of bar * density of material = [pi/4]*[d*d]*[L]*[R] = 147.71kg.

The weight of the bar depends on gravity, assuming g = 9.81 m/s^2 then weight would be mass*gravity = 1448.99 Newtons.

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Anonymous Poster
#3

Re: Weight Formula of a Round Bar

05/18/2007 5:35 AM

using steel weight @.283 lbs./cu.in. the bars will weigh approx. 209,109 lbs.

weight will vary by going to next decimal place #/cu.in.

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Guru

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#5

Re: Weight Formula of a Round Bar

05/18/2007 8:20 AM

Hello. are we mixing units here folks? I would not describe a round section 140 inches in diameter as a "bar." That aint no bar section. frankly its too wide for an ingot section. and it sure isn't a continuous cast billet.

140 mm, by 48inches Ok.

A motion to check units is always in order- milo

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#9
In reply to #5

Re: Weight Formula of a Round Bar

05/25/2007 3:56 PM

For that matter even 140 mm is NOT a bar, this is a normal size of a billet as per normal steel mill practice. A bar as per notmal practice is more often less than 2 inches even much smaller

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Guru

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#10
In reply to #9

Re: Weight Formula of a Round Bar

05/25/2007 4:15 PM

I hear you vishmayor.

Billets in North America are typically 4X4 (inches), 5X5 Or 5-3/4 square. (At least at the mills I worked at.)

Blooms were anything greater than 7X7. Lorain blooms were as I recall,

14.6" X 12.2" (372mm X 310mm) Bloom

We rolled up to 3-1/4" bars at our 13" mill in New York.

Republic sells a rolled round bar up to 6-1/2 inch out of their lorain mills.

milo

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#6

Re: Weight Formula of a Round Bar

05/18/2007 8:41 AM

I have used the following formulas at different times to figure weights.

ROUND ROD
Square of diameter * 9.42 * density of alloy = weight per lineal foot in pounds.

SQUARE BAR
Square of one side * 12 * density of alloy = weight per lineal foot in pounds.

HEXAGON ROD
Square of distance across flats * 10.4 * density of alloy = weight per lineal foot.

RECTANGULAR BAR
Thickness * width * 12 * density of alloy = weight per lineal foot in pounds.

ROUND TUBE
37.7 * density of alloy * wall thickness * outside diameter minus wall thickness = weight per lineal foot in pounds.

SQUARE TUBE
1.27 * the weight of a round tube of the same wall thickness, and of diameter equal to the distance across the flats of the square tube = weight per lineal foot.

SHEET
Thickness * 144 * density of alloy = weight per square foot in pounds.

STRIPS AND ROLLS
Thickness * width * 12 * density of alloy = weight per lineal foot in pounds.

CIRCLES
Square of diameter * thickness * 0.785 * density of alloy = weight of a circle.

RINGS
Outside diameter plus inside diameter * outside diameter minus inside diameter * thickness * 0.785 * density of alloy = weight of ring in pounds.

Material Density
Aluminum 0.0975
Ampco Metal 0.2740
SAE 660 Bearing Bronze 0.3180
Brass 0.3080
Copper 0.3230
Cupro Nickel 0.3230
Gold 0.6970
Iron 0.2840
Lead 0.4100
Magnesium 0.0610
Manganese 0.2670
Muntz Metal 0.3080
Naval Brass 0.3040
Nickel 0.3220
Platinum 0.7750
Silver 0.3780
Stainless Steel 0.2871
Steel 0.2840
Tin 0.2640
Tobin Bronze 0.3040
Zinc 0.2580

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Anonymous Poster
#7
In reply to #6

Re: Weight Formula of a Round Bar

05/18/2007 5:55 PM

Add to your material density list , pound/ cubic inch.

ME

USA

VIVA USA, I KEEP MY COUNTRY STRONG.

GOD BLESS AMERICA

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Guru

Join Date: Jun 2006
Posts: 503
Good Answers: 8
#8
In reply to #7

Re: Weight Formula of a Round Bar

05/18/2007 10:01 PM

Even a dumb hillbilly such as my self knows that the material density was in pounds per cubic inch!

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Anonymous Poster
#11
In reply to #6

Re: Weight Formula of a Round Bar

04/23/2008 7:41 AM

WT IN KG

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Anonymous Poster
#13
In reply to #11

Re: Weight Formula of a Round Bar

03/17/2009 6:54 AM

8mm,10mm, 12mm,16mm, 20mm, 25mm, 28mm &32mm weight per metre

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Anonymous Poster
#12

Re: Weight Formula of a Round Bar

07/10/2008 9:35 AM

From Guest:

To: All who replied to my question on formulas for solid round bar.

First of all an apology is in order for the delayed response to your explanations, secondly many thanks as they were both in lay format suitable for my understanding and clear on application of them.

regards

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Users who posted comments:

Anonymous Poster (9); jmart23 (1); Milo (2); MrChevy (1); The Hammer (1); vishmayor (1)

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