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All Categories > Carbon Bars, Plates, Tubing and Structural > Hot Rolled Carbon Steel > 1045-Hot Rolled Carbon Steel > 1045-Hot Rolled Carbon Steel-Rounds > Item # 7/8  
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Item # 7/8, 1045-Hot Rolled Carbon Steel-Rounds

These are medium-carbon steels. In their production, special controls are used for chemical composition, heating, rolling, surface preparation, etc. As a result of this careful processing, these bars are suitable for applications involving forging, heat treating (including flame hardening), cold drawing, machining, etc.

Special Quality

Stock Lengths: 20' (Some 30')

ASTM A 576 - UNS G10450

Specifications  · Analysis  · Applications  · Mechanical Properties  · Weldability  · Forging  · Normalizing  · Annealing  · Hardening


Estimated Weight per Foot

2.046 lb

Estimated Weight 20-Ft. Bar

40.93 lb

Carbon .43/.50
Manganese .60/.90
Phosphorus .04 Max.
Sulphur .05 Max.

These grades, particularly when heat treated, should be used where greater strength is required than can be obtained from the lower carbon steels. A few of the most frequent uses are for axles, machinery parts, stud bolts, ordinary shafts, pinions, gears, rock screens, forming dies, tool shanks.

Mechanical Properties
The following are average values for 1" round and may be considered as representative:
As Rolled
Tensile Strength - 90.000 psi
Yield Point - 59.000 psi
Elongation in 2" - 26%
Reduction of Area - 50%
Brinell Hardness - 201

Tensile Strength - 87.000 psi
Yield Point - 58.000 psi
Elongation in 2" - 28%
Reduction of Area - 52%
Brinell Hardness - 192

Tensile Strength - 80.000 psi
Yield Point - 48.000 psi
Elongation in 2" - 30%
Reduction of Area - 54%
Brinell Hardness - 159

These grades, due to higher carbon content, are not readily welded. As carbon content increases, difficulty in welding is likely to develop. With thin sections and flexible design, gas or arc welding may be used without preheating, but in joints over ^"to V thick preheating is necessary. To develop equivalent strength in a weld, a low alloy filler is recommended. Stress relieving is also recommended. The grade of welding rod to be used depends on thickness of section, design, service requirements, etc.

Heat to 2100°-2200°F.

Heat to 1600°-1750°F. Cool in air.

Heat to 1450°-1550°F. Cool in furnace.

These grades are essentially water-hardening steels but may be quenched in oil. The recommended quenching temperatures are 1550°F for water and 1575°F for oil. A wide range of mechanical properties can be obtained by tempering at different temperatures between 700°F and 1300°F. Tempering in the range from 500° to 700°F should be avoided.


·  Tolerance - Hot Rolled Carbon & Alloy Bars


Tolerances - Carbon and Alloy Bars
(PDF, 358KB)

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