Carbon Steel

Carbon steel is a common type of steel that is an alloy of iron and carbon. It has a higher carbon content, lower melting point and greater durability compared to stainless steel. Carbon steel is the most widely used engineering and construction material for industrial applications on a large scale, including marine structures, power plants, transportation, chemical processing and petroleum production and refining. The materials could be polished and can have different finishes. The dimensions of the fittings vary according to the standards and the pipe nominal sizes as well. Low carbon steels are more common than high carbon because of (1) lower production costs, (2) greater ductility, and (3) ease of use in manufacturing. Low carbon steels tend to deform under stress instead of breaking, and that ductility makes low carbon steels easy to machine and weld.

Carbon Steel Products

Technical Properties for Carbon Steel

Chemical Composition

Grade C Mn P S Si Cr Mo Ni Cu V Nb Cb Al
WPB 0.3 0.29-1.06 0.05 0.058 0.1min 0.4 0.15 0.4 0.4 0.08 0.02 - -
WPC 0.35 0.29-1.06 0.05 0.058 0.1min 0.4 0.15 0.4 0.4 0.08 0.02 - -
WPL3 0.20 0.31-0.64 0.05 0.05 0.13-0.37 - - 3.2-3.8 - - - - -
WPL6 0.30 0.60-1.35 0.035 0.040 0.15-0.30 0.30 0.12 0.40 0.40 0.05 - - -
Grade Mn P S Si Ni Cr Mo Cu Ti V Cb Al C
WPHY 42 0.20 1.00-1.45 0.03 0.01 0.15-0.40 0.50 0.30 0.25 0.35 0.05 0.10 0.04 -
Grade C Mn S P Si Ni Cr Mo Cu Ti V Cb Al
WPHY 52 0.20 1.00-1.45 0.03 0.01 0.15-0.40 0.50 0.30 0.25 0.35 0.05 0.10 0.06 -
Grade C Mn P S Si Ni Cr Mo Cu Ti V Cb Al
WPHY 56 0.20 1.00-1.45 0.03 0.01 0.15-0.40 0.50 0.30 0.25 0.35 0.05 0.10 0.04 0.06
Grade C Mn S P Si Ni Cr Mo Cu Ti V Cb Al
WPHY 60 0.20 1.00-1.45 0.03 0.01 0.15-0.40 0.50 0.30 0.25 0.35 0.05 0.10 0.06 -
Grade C Mn S P Si Ni Cr Mo Cu Ti V Cb Al
WPHY 65 0.20 1.00-1.45 0.03 0.01 0.15-0.40 0.50 0.30 0.25 0.35 0.05 0.10 0.06 -
Grade C Mn P S Si Ni Cr Mo Cu Ti V Cb Al
WPHY 70 0.20 1.00-1.45 0.03 0.01 0.15-0.40 0.50 0.30 0.25 0.35 0.05 0.10 0.04 0.06

Mechanical Properties

Tensile and Yield Strength WPB WPC WPL3 WPL6
Tensile strength, minimum unless a range is given ksi (MPa) 60 (415) 70 (485) 60-95 60-85[415-585]
Yield strength, min ksi (MPa) (0.2% offset or 0.5% extension under-load) 35 (240) 40 (275) 35 35[240]
ASTM A860/ 860M Yield Strength, min. Tensile Strength Elongation, min. Cv, avg./min.
Grade ksi MPa ksi MPa % ft*lbs J
WPHY 42 42 290 60-85 415-585 25 30/25 40/34
WPHY 46 46 315 63-88 435-605 25 30/25 40/34
WPHY 52 52 360 66-91 455-625 25 30/25 40/34
WPHY60 60 415 75-100 515-690 20 30/25 40/34
WPHY 65 65 450 77-102 530-705 20 30/25 40/34
WPHY 70 70 485 80-105 550-725 20 30/25 40/34