Difference Between Hot Rolled and Cold Rolled Steel Rod Based On Properties
Difference Between Hot Rolled and Cold Rolled Steel Rod As Per Properties
| Property |
Cold Rolled Steel |
Hot Rolled Steel |
| Temp. |
180°C / 350°F |
above 1700°F (926°C) |
| Hardness |
around 137 |
around 167 |
| Surface |
Smooth, ready to use |
Rough, may need treatment |
| Post-Processing |
No extra treatment needed |
May need extra treatment |
| Stress |
High stress |
Low internal stress |
Know Cold and Hot Rolled Steel Rod Differentiation As Per Application
Difference Between Cold and Hot Rolled Steel Rod Based on Application
Hot Rolled Steel Application
- Automobile parts
- Agricultural equipment
- Railroad equipment
- steel rod for construction
Cold Rolled Steel Application
- Aerospace structures
- Strips, rods, bars, and sheets
- Mechanical Components
- Home appliances
- Metal furniture
- construction rod
Compare Cold and Hot Rolled Steel Bars Strength, Grades and Price Wise
Differentiation Between Cold and Hot Rolled Steel Bars Grades and Price Wise
| Properties |
Cold Rolled Steel Bars |
Hot Rolled Steel Bars |
| Strength |
High strength |
low strength |
| Dimensions |
High precision in thickness and width.
|
Low precision
|
| Grades |
A36, A572, 1018, 1045, |
A36, A516, A572, 1018, 1045, 4140, |
| Surface Finish |
Smooth, shiny, and clean finish.
|
Surface is rougher |
| Price |
Expensive |
Cheaper |
Check Hot Rolled vs Cold Rolled Steel Round Bar Sizes and Tolerances
Hot Rolled Steel Rod Sizes
| Size |
Length |
Weight
(lbs/ft) |
| 3/8" |
240.00" |
0.375 |
| 1/4" |
240.00" |
0.170 |
| 5/8" |
240.00" |
1.042 |
| 1/2" |
240.00" |
0.667 |
| 5/16" |
240.00" |
0.260 |
| 9/16" |
240.00" |
0.845 |
| 7/8" |
240.00" |
2.055 |
| 7/16" |
240.00" |
0.510 |
| 1" |
240.00" |
2.670 |
| 3/4" |
240.00" |
1.502 |
| 1-1/4" |
240.00" |
4.173 |
| 1-1/8" |
240.00" |
3.380 |
| 1-1/2" |
240.00" |
6.010 |
| 1-3/8" |
240.00" |
5.049 |
| 1-3/4" |
240.00" |
8.178 |
| 1-5/8" |
240.00" |
7.052 |
| 2-1/4" |
240.00" |
13.520 |
| 2" |
240.00" |
10.680 |
| 3" |
240.00" |
24.030 |
| 2-1/2" |
240.00" |
16.689 |
Cold Rolled Steel Rod Sizes
| Size |
Length |
Weight
(lbs/ft) |
| 3/16" |
144.00" |
0.093 |
| 1/8" |
144.00" |
0.042 |
| 7/32" |
144.00" |
0.127 |
| 5/32" |
144.00" |
0.065 |
| 5/16" |
144.00" |
0.260 |
| 1/4" |
144.00" |
0.166 |
| 7/16" |
144.00" |
0.511 |
| 3/8" |
144.00" |
0.375 |
| 9/16" |
144.00" |
0.845 |
| 1/2" |
144.00" |
0.667 |
| 11/16" |
144.00" |
1.262 |
| 5/8" |
144.00" |
1.042 |
| 13/16" |
144.00" |
1.763 |
| 3/4" |
144.00" |
1.502 |
| 15/16" |
144.00" |
2.347 |
| 7/8" |
144.00" |
2.045 |
| 1-1/8" |
144.00" |
3.380 |
| 1" |
144.00" |
2.670 |
| 1-1/4" |
144.00" |
4.174 |
| 1-3/16" |
144.00" |
3.766 |
Hot Rolled Steel Round Bar Tolerances
| Nominal thickness |
Tolerances |
| Class B |
Class A |
Class D |
Class C |
| Lower |
Upper |
Lower |
Upper |
Lower |
Upper |
Lower |
Upper |
| > 8 < 15 |
-0.3 |
+1.4 |
-0.5 |
+1.2 |
-0.85 |
+0.85 |
-0 |
+1.7 |
| > 3 < 5 |
-0.3 |
+0.9 |
-0.4 |
+0.8 |
-0.6 |
+0.6 |
-0 |
+1.2 |
| > 15 < 25 |
-0.3 |
+1.6 |
-0.6 |
+1.3 |
-0.95 |
+0.95 |
-0 |
+1.9 |
| > 5 < 8 |
-0.3 |
+1.2 |
-0.4 |
+1.1 |
-0.75 |
+0.75 |
-0 |
+1.5 |
| > 40 < 80 |
-0.3 |
+2.5 |
-1.0 |
+1.8 |
-1.4 |
+1.4 |
-0 |
+2.8 |
| > 25 < 40 |
-0.3 |
+1.9 |
-0.8 |
+1.4 |
-1.1 |
+1.1 |
-0 |
+2.2 |
| > 150 < 250 |
-0.3 |
+3.3 |
-1.2 |
+2.4 |
-1.8 |
+1.8 |
-0 |
+3.6 |
| > 80 < 150 |
-0.3 |
+2.9 |
-1.0 |
+2.2 |
-1.6 |
+1.6 |
-0 |
+3.2 |
Cold Rolled Steel Rod Tolerances
| Nominal Dimension (mm) |
h7 |
h6 |
h9 |
h8 |
h11 |
h10 |
h12 |
| >3 to ≤6 |
0.012 |
0.008 |
0.030 |
0.018 |
0.075 |
0.048 |
0.120 |
| >1 to ≤3 |
0.010 |
0.006 |
0.025 |
0.014 |
0.060 |
0.040 |
0.100 |
| >10 to ≤18 |
0.018 |
0.011 |
0.043 |
0.027 |
0.110 |
0.070 |
0.180 |
| >6 to ≤10 |
0.015 |
0.009 |
0.036 |
0.022 |
0.090 |
0.058 |
0.150 |
| >30 to ≤50 |
0.025 |
0.016 |
0.062 |
0.039 |
0.160 |
0.100 |
0.250 |
| >18 to ≤30 |
0.021 |
0.013 |
0.052 |
0.033 |
0.130 |
0.084 |
0.210 |
| >80 to ≤120 |
0.035 |
0.022 |
0.087 |
0.054 |
0.220 |
0.140 |
0.350 |
| >50 to ≤80 |
0.030 |
0.019 |
0.074 |
0.046 |
0.190 |
0.120 |
0.300 |
| >180 to ≤200 |
0.046 |
0.029 |
0.115 |
0.072 |
0.290 |
0.185 |
0.460 |
| >120 to ≤180 |
0.040 |
0.025 |
0.100 |
0.063 |
0.250 |
0.160 |
0.400 |
Refer Hot Rolled and Cold Rolled Steel Manufacturing Process and Welding Difference
Difference of Hot Rolled and Cold Rolled Steel Manufacturing Process
| Property |
Hot Rolled Steel |
Cold Rolled Steel |
| Process |
Heated, shaped, then cooled |
Further processed at room temp |
| Temperature |
Above recrystallization temp |
Processed at room temp |
| Surface |
Rough, rounded edges |
Smooth, sharp edges |
| Tolerance |
Looser |
Tighter |
| Strength |
Lower |
Higher |
Hot Rolled vs Cold Rolled for Welding
| property |
Hot Rolled Steel |
Cold Rolled Steel |
| Weldability |
Easy to weld |
Hard to weld |
| Strength |
Low strength |
Higher strength |
| Distortion |
Less distortion |
More distortion |
Mechanical Properties of Steel Hot Rolled vs Cold Rolled
| Properties |
Cold Rolled Steel |
Hot Rolled Steel |
| Yield Strength |
365 MPa |
235 MPa |
| Tensile Strength |
85,000 psi |
67,000 psi |
| Reduction of Area |
55 |
58 |
| Elongation in 2” |
28 |
36 |
| Brinell Hardness |
167 |
137 |
Cold Rolled Steel Composition
| Element |
Percentage |
| C |
0.14 - 0.2 |
| Mn |
0.6 - 0.9 |
| Fe |
98.81 - 99.26 |
| S |
0.05 max |
| P |
0.04 max |
Hot Metal Rod VS Cold Metal Rod Benefits
