Carbon Steel allowable stress at a glance with ASTM standard specification and equivalent grades.

Carbon Steel properties are unique in that they are less expensive and contain only four elements in the composition. The term carbon steel is only applicable to material where manganese, silicon, copper, carbon and iron are only composition elements. There are restrictions for the amount of the elements that could be in carbon steel. Sometimes called the plain carbon steel, the Carbon Steel grades are derived by difference in the content in the material composition. There are four major types of carbon steel. They are the mild or low carbon steel where the composition can only have up to 0.25% of carbon, the medium carbon steel with 0.84% of carbon, high carbon steel with 0.65% carbon and the very high carbon steel with up to 2.1% carbon. These differences influence the Carbon Steel density. The density involves the weight, tensile strength and some other mechanical properties of the material. The addition of the elements in the right quantities to the Carbon Steel composition makes the grades or types be specifically used in specific applications. These could be used for various different applications such as ship building, wire, vehicle bodies, fencing, gates and railings. There are Carbon Steel application types per types of carbon. The medium carbon steel is good for gears, rails, shafts, axles, pipelines, fridges, cars couplings and also be used in building bridges. The high carbon steel is used for cutleries and wires of high strength. The very high carbon steel is used in larger machine parts, industrial casting, cutting tools, hot water radiators and other high strength applications. The Carbon Steel manufacturers produce different grades of Carbon Steel material. And the Carbon Steel price per kg differs from supplier to supplier. Our Carbon Steel products are very highly competitive in prices and are of high quality. You can get affordable prices from us upon inquiries.


Available Sectional Forms

Types of carbon steel and their properties

Carbon steel can be classified into three categories according to its carbon content: low-carbon steel (or mild-carbon steel), medium-carbon steel and high-carbon steel [1]. Their carbon content, microstructure and properties compare as follows:
Carbon content (wt.%) Microstructure Properties Examples
Low-carbon steel < 0.25 Ferrite, pearlite Low hardness and cost. High ductility, toughness, machinability and weldability AISI304, ASTM A815, AISI 316L
Medium-carbon steel 0.25 – 0.60 Martensite Low hardenability, medium strength, ductility and toughness AISI409, ASTM A29, SCM435
High-carbon steel 0.60 – 1.25 Pearlite High hardness, strength, low ductility AISI440C,    EN 10088-3

Low Carbon Steel grades

Grade UNS Designation number
1010 G10100
1018 G10180
1020 G10200
1022 G10220

Medium Carbon Steel grades

Grade UNS Designation number
1030 G10300
1040 G10400
1045 G10450
1060 G10600

Medium Carbon Steel grades

Grade UNS Designation number
1080 G10800
1095 G10950

CS ASTM Standard

Freequently used Carbon Steel ASTM grades:

ASTM A53/A53M/ SA 53 ASTM A106/A106M / SA 106
ASTM A134 / SA 134 ASTM A135/A135M / SA 135
ASTM A139/A139M / SA 139 ASTM A671 / S A671
ASTM A672 / SA672 ASTM A333 Grade 6 /3/ SA333
Piping Connection
A350 LF2/ SA 350 A105 / SA105
A694 / SA694 A234 WPB / SA234
A420 WPL6 / SA420 A860 (WPHY) / SA860

Carbon Steel Temperature Range

  • CS Temperature Range: 29 to 427 °C
  • LTCS – Low Temperature Carbon steel Temperature Range : 45.5 to 427 ° C

Carbon Steel Composition

Low Carbon Steel grade Chemical Formula

Grade UNS Number S (max) C (max) P (max) Mn (max) Si Cr Ni Mo
1010 G10100 .05% .08-.13% .04% .30-.60%
1018 G10180 .05% .14-.20% .04% .60-.90%
1020 G10200 .05% .17-.23% .04% .30-.60%
1022 G10220 .05% .17-.23% .04% .70-1.00%

Medium Carbon Steel material Chemical Properties

Grade UNS Number Mn (max) S (max) C (max) P (max) Si Cr Ni Mo
1010 G10100 .30-.60% .05% .08-.13% .04%
1018 G10180 .60-.90% .05% .14-.20% .04%
1020 G10200 .30-.60% .05% .17-.23% .04%
1022 G10220 .70-1.00% .05% .17-.23% .04%

Properties of CS

Alloy Type AISI Carbon content (wt.%) Yield strength (MPa) Tensile strength (MPa) Ductility (% elongation in 50 mm) Common Uses
Low 1010 .10 180 325


Automobile panels, nails, wire
Low 1020 .20 205 380 25 structural steel, Pipe, sheet steel
Low A36 .29 220 400 23 Structural alloy
Low A516 Gr 70 .31 260 485 21 LTCS pressure vessels
Medium 1030 .27 – .34 325 460 12 Gears, machinery items, shifts, axles, bolts
Medium 1040 .37 – .44 415 620 25 coupling, crankshafts, cold headed parts.
High 1080 .75 – .88 440 924 12 Music wire
High 1095 .90 – 1.04 380 665 10

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