Carbon Steel Guide


Freemax 15 DCF Plate

Freemax 15 is a low carbon, free machining steel plate. These plates were developed for enhanced machinability to reduce machining time and increase productivity while also reducing wear and breakage of machining tools. Freemax contains higher levels of sulfur which makes it not only free machining but also improves surface finish characteristics. It contains carbon levels comparable to other low carbon grades such as 1018 so it will respond to similar hardening methods such as carburizing. These plates are ground top and bottom to a decarb free, oversize finish and sawcut on the widths and lengths. Other comparable trade names include J20, Clean Cut 20 (CC20), LFM 20, FM15, 1119 Modified, and C1119 steel. Typical uses include: gears, cams, sprockets, jigs and fixtures, blanking and trim dies, slides, racks, chucks, rubber molds, strippers, and bushings.

C1119 is a registered trademark of ArcelorMittal
Fremax is a registered trademark of United States Steel Corp

Typical Analysis:

Carbon
.20
Sulfur
.25
Phosphorus
.06/.12
Molybdenum
.20/.30
Silicon
.10/.30
Manganese
.90/1.20

Temp. °F
Normalizing 1650-1750
Annealing 1550-1600
Hardening 1450-1500
Stress Relieve 1250-1300
Carburize
1650-1700
Mechanical Properties
Tensile Strength 70-80 ksi
Yield Point 40-50 ksi
Elongation 2" % 30
Red. Area % 60
Hardness Brinell 150
Hardness Rb 81
Machinability % 140













1018 CF Steel

A general purpose, low carbon steel with a higher manganese content that other low carbon grades. The higher manganese content allows 1018 to achieve a harder and more uniform case. Also possesses greater mechanical properties and machining than similar low carbon grades. Typical uses include: parts requiring cold forming, bending, or swaging, carburized parts such as pinions, gears, pins, ratchets, and worms.

Typical Analysis:

Carbon
.15/.20
Sulfur
.050 max
Phosphorus
.040 max
Manganese
.60/.90
Temp. °F
Normalizing 1650-1750
Annealing 1550-1650
Carburize
1650-1700
Mechanical Properties
Tensile Strength 70-85 ksi
Yield Point 60-75 ksi
Elongation 2" % 18-25
Red. Area % 45-55
Hardness Brinell 167
Hardness Rb 86
Machinability % 78














12L14 CF Steel

A resulfurized and rephosphorized low carbon steel with lead added resulting in one of the fastest machining grades available. 12L14 possesses very low friction resulting in a smooth machined surface and increased life. Perfect for automatic screw machine parts. Due to high sulphur content it is not considered weldable. 12L14 will respond to conventional heat treating but are not considered case hardening. Better results can be obtained by using 1018 in that case. Applications include: bushings, couplings, inserts and parts involving bending and crimping.

Typical Analysis:

Carbon
.15 max
Sulfur
.25/.35
Phosphorus
.04/.09
Manganese
.85/1.15
Lead
.15/.35
Mechanical Properties
Tensile Strength 70-85 ksi
Yield Point 60-75 ksi
Elongation 2" % 12-18
Red. Area % 40-50
Hardness Brinell 150-180
Hardness Rb 80-90
Machinability % 185














1144 G&P Stressproof Steel

A medium carbon, resulfurized steel with added sulfur to achieve a free machining grade with high strength. Stressproof has been cold worked to result in higher tensile properties. Further heat treatment is not necessary as Stressproof has a hardness similar to that of a heat treated grade. These bars are stress relieved to reduce warpage during machining. Uses include: pinions, gears, shafts, mandrels, racks, boring bars, bushings, collets, pins, arbors, and spindles.

Stressproof is a registered trademark of LaSalle Steel Co.

Typical Analysis:

Carbon
.40/.48
Sulfur
.24/.33
Phosphorus
.040 max
Manganese
1.35/1.65

Mechanical Properties
Tensile Strength 100 ksi
Yield Point 115 ksi
Elongation 2" % 8
Red. Area % 25
Hardness Brinell 235-285
Hardness Rc 22-30
Machinability % 83














A36 Structural Steel

A36 hot rolled mild steel bars are used in most general purpose applications. Low carbon content relatively good mechanical properties along with high quality weldability make it a common choice in fabrication and structural applications. Uses include: general machinery where suface imperfections may be tolerated.

Typical Analysis:

Carbon
.25
Sulfur
.05 max
Phosphorus
.04 max
Manganese
.80/1.20
Mechanical Properties
Tensile Strength 58-80 ksi
Yield Point 36 ksi min
Elongation 2" % 18 min
Red. Area % 21 min
Hardness Brinell 135
Hardness Rb 76














A500 Grade B Structural Steel Tubing


Typical Analysis:

Carbon
.15/.25
Sulfur
.050 max
Phosphorus
.040 max
Manganese
.30/.60
Mechanical Properties
Tensile Strength 58 ksi
Yield Point 46 ksi
Elongation 2" % 23
Red. Area % 25
Hardness Brinell 235
Hardness Rb 99
Machinability % 40