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All Categories > Carbon Bars, Plates, Tubing and Structural > Cold Finished Carbon Steels > Stressproof or Equiv.-Cold Finished Carbon Steels > Stressproof-Cold Ground & Polished Finished Carbon Steels-Rounds > Size 1/2  
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Size 1/2, Stressproof-Cold Ground & Polished Finished Carbon Steels-Rounds

These are carbon-manganese free machining grades which have been severely cold worked to produce high tensile properties. The bars are specially treated to relieve the stresses set up by the cold working, thus minimizing the tendency toward warpage after machining which is common in ordinary cold.drawn bars.
These steels have built-in high strength hardness, and wearability, without the necessity of heat treatment. Thus they are often used for parts requiring mechanical properties ordinarily obtained by heat treating an alloy grade to the Rockwell C hardness range of 23-30 after machining.
Both grades are available as Cold Drawn Bars or Ground and Polished Bars. The latter possess the close tolerances and fine finish normally found in ground and polished bars, plus the combination of free machinability, minimum warpage, high strength and wearability not found in ordinary steels.

Stock Lengths: 20' Approx.

ASTM A311 Class B

Color Marking: Ends painted Gray

Specifications  · Analysis  · Applications  · Mechanical Properties  · Machinability  · Weldability


Estimated Weight per Foot

.6682 lb

Estimated Weight 20-Ft. Bar

13.36 lb

Carbon .40/.48
Manganese 1.35/1.65
Phosphorus .04 Max.
Sulphur .24/.33 Max.

Arbors, keyed shafts, spindles, gears, pinions, piston rods, sleeves, lead screws, racks, motor shafts, splirted shafts, link pins, mandrels, boring bars, collets, bushings, drive-shafts, armature shafts, rotary pump shafts, gusher pump shafts, king pins, oil and water pump shafts, wrist pins, etc.

Mechanical Properties
The following are minimum properties per ASTM A311 Class B:
Thru 2"
Tensile Strength - 115,000 psi
Yield Strength - 100,000 psi
Elongation in 2" - 8%
Reduction of Area - 25%
Typical Rockwell "C" Hardness - 26
Over 2" thru 3"
Tensile Strength - 115,000 psi
Yield Strength - 100,000 psi
Elongation in 2" - 8%
Reduction of Area - 20%
Typical Rockwell "C" Hardness - 25
Over 3"
Tensile Strength - 115,000 psi
Yield Strength - 100,000 psi
Elongation in 2" - 7%
Reduction of Area - 20%
Typical Rockwell "C" Hardness - 24

Machinability ratings are based on 1212 as 100%. Stressproof — 83%, cutting speed 140 surface feet per minute. 1144 Hi Stress — 79%, cutting speed 130 surface feet per minute.

Welding of these grades is not recommended. STRESSPROOF is a registered Trademark of the LaSalle Steel Co., producers of the material.


Tolerance - Cold Finished Carbon Bars
(PDF, 213KB)

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

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