AISI 1144 Medium-carbon steel bar


Standards: ASTM A311 (Class B), ASTM A108

Steel mill: Dongbei Special Steel/Shougang

Size: Round bar (Diameter): 6.35mm – 63mm

Square bar / Flat bar: 3mm to 800mm

Type: Round bar, Square bar, Flat bar

Surface treatment: Turned ground & polished finish

Heat treatment: Cold finished, hot rolled

1144 steel is a type of high strength medium carbon resulphurized carbon steel containing manganese and Sulphur, also known as Stressproof steel. It offers excellent free machining qualities and higher mechanical properties and can be treated to relieve the stress created by the cold drawing. 1144 steel has been used where resistance to deformation and wear are essential like gears, pinions, piston rods, sleeves, lead screws, racks, shafts, pump shafts, arbors, spindles, link pins, mandrels, boring bars, bushings, or can be used as an economical replacement for more expensive quenched-and-tempered alloy grades.


1144 Equivalent Material

G11440 SUM43 44Mn28 Y40Mn


1144 Chemical Composition

C Si Mn P S Fe
0.40-0.48 1.35-1.65 1.20-1.55 0.040 Max 0.24-0.33 Balanced


1144 Mechanical Property(Hot rolled)

Tensile strength, Mpa Yield strength, Mpa Elongation (%) Reduction of area (%) Hardness
745 620 ≥10 ≥30 ≤207HB


Wiho Steel is a fully stocked and leading metal manufacturer, supplier, exporters, distributors of steel mill-product forms such as pipe, tubing, bar and rod. The steel products provide by us shall be fabricated from prime quality raw materials and is fully certifiable to industrial specifications like ASTM and ASME or other relevant standards. Wiho Steel supply and stock a large inventory of ASTM 1144, AISI 1144, SAE 1144 (SUM43 / 44Mn28/ Y40Mn) round bar used for machined parts requiring higher strength and wear resistance. For more information, please contact us or fill in the form below.

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