Cold Roll

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What is the difference between hot & cold rolled steel?

#First let me explain about hot and cold rolling:
#Cold rolling is a metal working process in which metal is deformed by passing it through rollers at a temperature below its recrystallization temperature. Cold rolling increases the yield strength and hardness of a metal by introducing defects into the metal's crystal structure. These defects prevent further slip and can reduce the grain size of the metal, resulting in Hall-Petch hardening.
#Hot rolling:
The metallurgical process of Hot rolling, used mainly to produce sheet metal or simple cross sections from billets describes the method of when industrial metal is passed or deformed between a set of work rolls and the temperature of the metal is generally above its recrystallization temperature, as opposed to cold rolling, which takes place below this temperature. Hot rolling permits large deformations of the metal to be achieved with a low number of rolling cycles.

Because the metal is worked before crystal structures have formed, this process does not itself affect its microstructural properties. Hot rolling is primarily concerned with manipulating material shape and geometry rather than mechanical properties. This is achieved by heating a component or material to its upper critical temperature and then applying controlled load which forms the material to a desired specification or size.

#Theoretically, the only difference between hot rolled and cold rolled steels is that hot rolled steel is rolled to its final dimensions while hot enough to scale (over 1700 degrees F) while cold rolled steel is rolled to its final dimensions well below scaling temperatures.
-The finished tolerances on hot rolled steels are looser than on cold rolled. Not only the plus or minus tolerance from nominal size, but the "square-ness" of the product. And, I can tell you from personal experience that there’s a lot of trapezoidal A36 out there. So, if you need a specific size and you are going to go to a “surplus” place, bring your ruler, square and micrometer to make sure you get what you need.
-You’d get fewer slag or carbon inclusions with cold rolled steels.
-One other difference that may be of interest to the blacksmith is that if you buy "1018”cold rolled steel", you can be pretty sure that it has close to a 0.18% carbon content and few other impurities. But the spec for A36 can let the carbon content go as high as 0.29% and it can contain many more impurities. More carbon makes it harder to forge.

-You generally have to pay about twice as much money for cold rolled steel as for hot rolled steel, for reasons which are probably obvious from the above.

Discover Cold Roll On eBay Below:

048 x 12 x 12 18 ga Cold Rolled Steel Sheet A1008 CR18 12x12
048 x 12 x 12 18 ga Cold Rolled Steel Sheet A1008 CR18 12x12
$16.39
059 x 12 x 12 16 ga Cold Rolled Steel Sheet A1008 CR16 12x12
059 x 12 x 12 16 ga Cold Rolled Steel Sheet A1008 CR16 12x12
$17.08
048 x 12 x 24 18 ga Cold Rolled Steel Sheet A1008 CR18 12x24
048 x 12 x 24 18 ga Cold Rolled Steel Sheet A1008 CR18 12x24
$23.92
Procraft 048 x 12 x 36 18 ga Cold Rolled Steel Sheet A1008 CR18 12x36
Procraft 048 x 12 x 36 18 ga Cold Rolled Steel Sheet A1008 CR18 12x36
$31.61
059 x 12 x 36 16 ga Cold Rolled Steel Sheet A1008 CR16 12x36
059 x 12 x 36 16 ga Cold Rolled Steel Sheet A1008 CR16 12x36
$37.16
STEEL ROD BLOCK PIN METRIC PIN SHAFT PLATED PINS COLD ROLL PIN ALLOY C1144 C1215
STEEL ROD BLOCK PIN METRIC PIN SHAFT PLATED PINS COLD ROLL PIN ALLOY C1144 C1215
$800.00
048 x 12 x 48 18 ga Cold Rolled Steel Sheet A1008 CR18 12x48
048 x 12 x 48 18 ga Cold Rolled Steel Sheet A1008 CR18 12x48
$42.37
059 x 12 x 48 16 ga Cold Rolled Steel Sheet A1008 CR16 12x48
059 x 12 x 48 16 ga Cold Rolled Steel Sheet A1008 CR16 12x48
$46.49
STEEL ROD BLOCK PIN METRIC PIN SHAFT PLATED PINS COLD ROLL PIN ALLOY C1144 C1215
STEEL ROD BLOCK PIN METRIC PIN SHAFT PLATED PINS COLD ROLL PIN ALLOY C1144 C1215
$1,000.00
5 Pk Cold Rolled 1 2 Dia Round X 3 Solid Steel Shaft Rod N301192
5 Pk Cold Rolled 1 2 Dia Round X 3 Solid Steel Shaft Rod N301192
$49.99
15 Pk Cold Rolled 1 2 Dia Round X 3 Solid Steel Shaft Rod N301192
15 Pk Cold Rolled 1 2 Dia Round X 3 Solid Steel Shaft Rod N301192
$138.99
16ga Sheet Metal Steel Cold Rolled 3x6 Quantity 3
16ga Sheet Metal Steel Cold Rolled 3x6 Quantity 3
$9.99
PRECISION BRAND Shim StockRollCold 302 SS00050 In 22230
PRECISION BRAND Shim StockRollCold 302 SS00050 In 22230
$44.80
Cold Rolled Steel Hex Bar 1 1 4 X 48 Long Surplus MaterialH
Cold Rolled Steel Hex Bar 1 1 4 X 48 Long Surplus MaterialH
$23.75
Cold Rolled Steel Hex Bar 1 1 4 X 24 Long Surplus MaterialH
Cold Rolled Steel Hex Bar 1 1 4 X 24 Long Surplus MaterialH
$12.50
Shim StockRollCold Low Stl00180 In PRECISION BRAND 16570
Shim StockRollCold Low Stl00180 In PRECISION BRAND 16570
$43.89
Shim StockRollCold Low Stl00165 In PRECISION BRAND 16730
Shim StockRollCold Low Stl00165 In PRECISION BRAND 16730
$15.86
Shim StockRollCold Low Stl00220 In PRECISION BRAND 16755
Shim StockRollCold Low Stl00220 In PRECISION BRAND 16755
$17.19
Shim StockRollCold 302 SS150mm PRECISION BRAND 22979
Shim StockRollCold 302 SS150mm PRECISION BRAND 22979
$46.95
Shim StockRollCold Low Stl00250 In PRECISION BRAND 16760
Shim StockRollCold Low Stl00250 In PRECISION BRAND 16760
$23.95
4 PC 1 4 Diameter Cold Rolled 1018 Steel Rod 12 Length Lathe Stock LOT OF 4
4 PC 1 4 Diameter Cold Rolled 1018 Steel Rod 12 Length Lathe Stock LOT OF 4
$6.50
4 Pieces 1 2 x 36 ft long Square Bar C1018 Cold Rolled Mild Steel Blacksmith
4 Pieces 1 2 x 36 ft long Square Bar C1018 Cold Rolled Mild Steel Blacksmith
$33.99
1 3 4 x 3 x 12 4140 Cold Rolled Steel Flat Bar Bar Stock
1 3 4 x 3 x 12 4140 Cold Rolled Steel Flat Bar Bar Stock
$58.00
3 4 x 4 x 8 inch 4140 CFA steel cold rolled annealed Free Shipping 75 x 4
3 4 x 4 x 8 inch 4140 CFA steel cold rolled annealed Free Shipping 75 x 4
$32.00
1008 Cold Rolled Steel Sheet 21 ga 033 x 12 x 12
1008 Cold Rolled Steel Sheet 21 ga 033 x 12 x 12
$13.01
1008 Cold Rolled Steel Sheet 21 ga 033 x 24 x 24
1008 Cold Rolled Steel Sheet 21 ga 033 x 24 x 24
$20.74
24 GA COLD ROLL SHEET 36 X 36
24 GA COLD ROLL SHEET 36 X 36
$20.00
22 GA COLD ROLL SHEET 12 X 12
22 GA COLD ROLL SHEET 12 X 12
$11.00
22 GA COLD ROLL SHEET 12 X 24
22 GA COLD ROLL SHEET 12 X 24
$13.00
22 GA COLD ROLL SHEET 36 X 36
22 GA COLD ROLL SHEET 36 X 36
$23.00
20 GA COLD ROLL SHEET 12 X 24
20 GA COLD ROLL SHEET 12 X 24
$14.00
20 GA COLD ROLL SHEET 24 X 24
20 GA COLD ROLL SHEET 24 X 24
$17.00
20 GA COLD ROLL SHEET 36 X 36
20 GA COLD ROLL SHEET 36 X 36
$27.00
20 GA COLD ROLL SHEET 12 X 48
20 GA COLD ROLL SHEET 12 X 48
$13.00
Cold Rolled Steel Flat Bar 1018 125 x 12 x 72
Cold Rolled Steel Flat Bar 1018 125 x 12 x 72
$90.31
18 GA COLD ROLL SHEET 36 X 48
18 GA COLD ROLL SHEET 36 X 48
$33.00
18 GA COLD ROLL SHEET 12 X 12
18 GA COLD ROLL SHEET 12 X 12
$13.00
18 GA COLD ROLL SHEET 12 X 24
18 GA COLD ROLL SHEET 12 X 24
$16.00
16 GA COLD ROLL SHEET 12 X 24
16 GA COLD ROLL SHEET 12 X 24
$20.00

Recently Purchased Cold Roll:


35 diameter 6 long cold rolled 1018 steel round bar shaft blacksmithing, 1 piece 1 12 x 5 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 1 12 x 4 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 1 12 x 3 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 1 12 x 2 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 1 12 x 1 foot c1018 cold rolled mild steel hexagon bar ships ups, 1 piece 1 x 5 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 1 x 4 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 1 x 3 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 1 x 2 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 1 x 1 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 34 x 5 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 34 x 4 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 34 x 3 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 34 x 2 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 34 x 1 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 58 x 5 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 58 x 4 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 58 x 3 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 58 x 2 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 58 x 1 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 12 x 5 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 12 x 4 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 12 x 3 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 12 x 2 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 12 x 1 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 38 x 5 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 38 x 4 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 38 x 3 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 38 x 2 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 38 x 1 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 14 x 5 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 14 x 4 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 14 x 3 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 14 x 2 foot c1018 cold rolled mild steel hex bar ships ups, 1 piece 14 x 1 foot c1018 cold rolled mild steel hex bar ships ups, 114 1250 cold rolled mild steel round rod blacksmith special c1018, 14 gauge 069 x 1 x 12 1018 cold rolled steel sheet plate, metals solid round 134 diameter cold rolled steel 153 feet toatl length, cold roll steel round bar 1018 178 x 48, precision brand 25140 assorted steel arbor shim low carbon cold rolled full, steel sheet metal cold rolled18 gauge thick x 8x12 combine shipping, 45 thick cold rolled steel plate disc shaped 475 diameter round cr circle, 1018 cold rolled steel rod machine tool die shop round stock 3 od x 6 34 oal, 1018 cold rolled steel rod machine tool die shop round stock 3 od x 8 14 oal, 1018 cold rolled steel rod machine tool die shop round stock 2 od x 12 12 oal, 1018 cold rolled steel rod machine tool die shop round stock 58 od x 23 oal, cold rolled mild steel round bar stock crs 1560 x 24, cold rolled steel hexhexagonal bar stock crs 15 x 24, 16ga steel sheet metal cold rolled 6x12 quantity 1, 1018 cold rolled steel rod round machine tool die shop stock 34 od x 12 oal, 1018 cold rolled steel rod round machine tool die shop stock 1 18 od x 12 oal, 1018 cold rolled steel rod round machine tool die shop stock 1 12 od x 12 oal, boltmaster round rod 38 d x 36 l cold rolled low carbon steel blue pack of 5, 110v qomolangma 63 fullauto roll to roll hot cold laminator heat assistedus, cold rolled steel bar 1 12 x 6 x 12 1018 , 4 precision brand shim stock roll cold low carbon steel 00020 mfg 16195, 1 x 3 x 16 cold rolled steel rectagular bar remnant, hillman 24in x 4ft cold rolled weldable steel sheet metal round tube gauge , c1020 cold rolled steel bar 112 x 3 x 12 15, 0563 12l14 cold roll hex 48 length, 0563 12l14 cold roll hex 12 length, 0563 12l14 cold roll hex 72 length, 14375 round cold rolled 1144 steel bar 12 pc blacksmith shaft 1716 , rollomatic inc durofan temperature control warm cold fan machine shop, cold roll steel round bar 1 18 x 36 , metals solid round rod 18 diameter x 48 long steel iron cold rolled bundles, 1 x 1 34 x 11 1018 cold rolled steel rusted blacksmith fabrication