The Difference Between Hot & Cold Rolled Steel
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The Difference Between Hot Rolled Steel & Cold Rolled Steel
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Hot rolled steel and cold rolled steel are some of the most widely manufactured steel types in the world. They make the I-beams we see in buildings, railroad tracks, automotive parts, tooling equipment, and are a part of everyday objects we come across. There's a simple difference between hot and cold rolled steel that makes a huge impact on the size, quality, strength and appearance of the steel. Learn why hot rolling and cold rolling steel makes a huge difference on the type of steel that is produced, why there is such a big difference in the cost of making each, the yield and tensile strength of the steel, and other physical characteristics.
Transcript of The Difference Between Hot & Cold Rolled Steel
The Difference Between Hot Rolled Steel & Cold Rolled Steel
When it comes down to making cold rolled steel and hot rolled steel , the process is quite similar.
They are both made from the
same materials.
They go through a similar manufacturing process, except for one crucial part.
Cold rolled steel is rolled, or passed through at least two rollers at room temperature
until it forms the desired shape and dimensions.
And hot rolled steel is rolled at or above its
recrystallization temperature, which is at
1,700 °F.
Why is steel rolled? Why at different temperatures?
Rolling steel removes induced stresses and
grain deformations of the steel.
Rolling steel also forms steel into desired shapes and dimensions.
The physical properties of hot rolled steel and cold rolled steel
vary greatly.
Appearance
Hot Rolled• Scaly• Blue-gray finish• Rough to the
touch
Cold Rolled• Glossy• Gray fi nish• Smooth to the
touch
Dimensions
Hot Rolled• Less Precise
Cold Rolled• More Precise
Strength
Cold Rolled• Stronger• Up to 80%
bett er yield strength.
• Up to 40% bett er tensile strength.
Hot Rolled• Weaker
Cost
Hot Rolled• Less Expensive
Cold Rolled• More Expensive
*This varies on many factors, including whether the steel that is being hot rolled is required to be reheated or not, and whether the steel is pickled and oiled.
Practical UsesHot Rolled Steel
I-beams, railroad tracks, and materials needed in large quantities.
Practical UsesCold Rolled Steel
Tooling and machining products, automotive parts, anything that requires more strength.
To Learn more about cold rolled and hot rolled steel, visit Capital Steel & Wire’s website.
www.capitalsteel.netSource
