Hot Rolled Steel Round Bar Tolerances, Weight, Process
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Raaj Sagar Steel Iso Certified Stainless Steel Hot Rolled Round Bar, Aisi 1010, 4140 Hot Rolled Flat Bar & Astm A36 Hot Rolled Flat, 1018 Hex, 1045 Hot Rolled Square Bars Manufacturers in India.
Round peeled bars are produced by cutting tools chipping off the surface of the steel, as a result they feature a smooth and polished surface.
Consequently, possible surface defects may be removed from the rolled product and a technically surface defect free product is obtained. Peeling is followed by polishing with straightness control and improvement of roughness.
Applications: Automotive, tooling machinery, fine Mechanics, nuts and bolts
Hot rolled round steel bars, usually named “round bars”, are produced by hot rolling continuously cast steel billets. Round bars are used in hot die pressing and forging but they may also undergo cold finishing.
A variety of mechanical components such as gears, hubs, shafts, drives and many more can be obtained by die pressing and forging. They all have to resist, sustain and transfer motion and must not warp. In this field, steel fosters real industry development.
Hot rolled square bars are produced by hot rolling continuously cast steel billets. Geometrically they have a square cross-section with sharp edges and are intended either to be further machined or drawn. By mechanical processing a vast number of components of industrial equipment and tooling machines are manufactured.
Applications: Industrial equipment, tooling machinery, cold finishing (drawing).
TYPES OF HOT ROLLED BARS WE SUPPLY
Stainless Steel Hot Rolled Bar
A36 Hot Rolled Bar
Hot Rolled Flat Bar
Aisi 1010 Steel Hot Rolled Bar
Astm Hot Rolled Steel Bar
Hot Rolled Carbon Steel Round Bar
Hot Rolled Peeled Bar
Hot Rolled Profile Bar
Hot Rolled Plain Steel Bar
Hot Rolled Round Bar
Hot Rolled Steel Tee Bar
1018 Hot Rolled Round Bar
A36 Hot Rolled Steel Tee Bar
Hot Rolled Mild Steel T Bars
1018 Hot Rolled Bar
1045 Hot Rolled Square Bar
Hot Rolled Square Bar En 10059
4140 Hot Rolled Bar Stock
Below is a chart for reference on hot rolled bar tolerances.
| Specified Sizes (Rounds or Squares) | Over | Under | Out-of-Round or Square | Machining Allowance - Minimum Stock Removal* |
| To 5/16" included | 0.005" | 0.005" | 0.008" | 0.016" |
| Over 5/16" to 7/16" included | 0.006" | 0.006" | 0.009" | 0.016" |
| Over 7/16 to 5/8" included | 0.007" | 0.007" | 0.010" | 0.016" |
| Over 5/8" to 7/8" included | 0.008" | 0.008" | 0.012" | 0.021" |
| Over 7/8" to 1" included | 0.009" | 0.009" | 0.013" | 0.023" |
| Over 1" to 1-1/8" included | 0.010" | 0.010" | 0.015" | 0.025" |
| Over 1-1/8" to 1-1/4" included | 0.011" | 0.011" | 0.016" | 0.028" |
| Over 1-1/4" to 1-3/8" included | 0.012" | 0.012" | 0.018" | 0.030" |
| Over 1-3/8" to 1-1/2" included | 0.014" | 0.014" | 0.021" | 0.033" |
| Over 1-1/2" to 2" included | 1/64" | 1/64" | 0.023" | 0.042" |
| Over 2" to 2-1/2" included | 1/32" | 0" | 0.023" | 0.052" |
| Over 2-1/2" to 3-1/2" included | 3/64" | 0" | 0.035" | 0.072" |
| Over 3-1/2" to 4-1/2" included | 1/16" | 0" | 0.046" | 0.090" |
| Over 4-1/2" to 5-1/2" included | 5/64" | 0" | 0.058" | 0.110" |
| Over 5-1/2" to 6-1/2" included | 1/8" | 0" | 0.070" | 0.125" |
| Over 6-1/2" to 8-1/4" included | 5/32" | 0" | 0.085" | 0.155" |
| Over 8-1/4" to 9-1/2" included | 3/16" | 0" | 0.100" | 0.203" |
| Over 9-1/2" to 10" included | 1/4" | 0" | 0.120" | 0.250" |
Diameter D, mm |
Weight, kg/m |
Diameter D, mm |
Weight, kg/m |
Diameter D, mm |
Weight, kg/m |
Diameter D, mm |
Weight, kg/m |
8 |
0,39 |
30 |
5,55 |
90 |
49,94 |
190 |
222,6 |
10 |
0,62 |
32 |
6,31 |
95 |
55,64 |
200 |
246,6 |
11 |
0,75 |
35 |
7,55 |
100 |
61,65 |
210 |
271,76 |
12 |
0,89 |
38 |
8,9 |
105 |
67,97 |
220 |
298,25 |
13 |
1,04 |
40 |
9,86 |
110 |
74,6 |
230 |
325,98 |
14 |
1,21 |
42 |
10,88 |
115 |
81,54 |
235 |
340 |
15 |
1,39 |
45 |
12,48 |
120 |
88,78 |
240 |
354,95 |
16 |
1,58 |
48 |
14,21 |
125 |
96,33 |
250 |
385,14 |
17 |
1,78 |
50 |
15,41 |
130 |
104,19 |
260 |
416,57 |
18 |
2 |
55 |
18,65 |
135 |
112,36 |
270 |
449,23 |
19 |
2,23 |
60 |
22,2 |
140 |
120,84 |
285 |
501 |
20 |
2,46 |
65 |
26,05 |
145 |
129,63 |
290 |
518 |
22 |
2,98 |
70 |
30,21 |
150 |
138,72 |
295 |
536 |
24 |
3,55 |
75 |
34,68 |
160 |
157,8 |
300 |
555 |
25 |
3,85 |
80 |
39,46 |
170 |
178,2 |
310 |
592 |
28 |
4,83 |
85 |
44,54 |
180 |
199,8 |
330 |
671 |
| Steel grades | S235JR, S275JR, St3sp, S355J2, 15, 20, 45, 20Х, 40Х, 41Cr4, 18ХГТ, 16MnCr5, 30ХГТ, 42CrMo4 |
| Standart length | 6000 mm |
| Standarts | Steel | EN 10025, EN 10083, EN 10084, GOST 380, GOST 1050, GOST 4543 |
| Dimensions and tolerances | EN 10060, GOST 2590 |
Hot Rolled Steel
Hot rolling is a mill process which involves rolling the steel at a high temperature (typically at a temperature over 1700° F), which is above the steel’s recrystallization temperature. When steel is above the recrystallization temperature, it can be shaped and formed easily, and the steel can be made in much larger sizes. Hot rolled steel is typically cheaper than cold rolled steel due to the fact that it is often manufactured without any delays in the process, and therefore the reheating of the steel is not required (as it is with cold rolled). When the steel cools off it will shrink slightly thus giving less control on the size and shape of the finished product when compared to cold rolled.
Cold Rolled Steel
Cold rolled steel is essentially hot rolled steel that has had further processing. The steel is processed further in cold reduction mills, where the material is cooled (at room temperature) followed by annealing and/or tempers rolling. This process will produce steel with closer dimensional tolerances and a wider range of surface finishes. The term Cold Rolled is mistakenly used on all products, when actually the product name refers to the rolling of flat rolled sheet and coil products.
When referring to bar products, the term used is “cold finishing”, which usually consists of cold drawing and/or turning, grinding and polishing. This process results in higher yield points and has four main advantages:
Cold drawing increases the yield and tensile strengths, often eliminating further costly thermal treatments.
Turning gets rid of surface imperfections.
Grinding narrows the original size tolerance range.
Polishing improves surface finish.
All cold products provide a superior surface finish, and are superior in tolerance, concentricity, and straightness when compared to hot rolled.
Cold finished bars are typically harder to work with than hot rolled due to the increased carbon content. However, this cannot be said about cold rolled sheet and hot rolled sheet. With these two products, the cold rolled product has low carbon content and it is typically annealed, making it softer than hot rolled sheet.
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