A36 &A283C

COMPARISON BETWEEN ASTM A 36AND ASTM A 283 GRADE C

1. MATERIAL SCOPE (5.1)

ASTM A 283 Gr. C consist of four grade of material (A, B, C, & D) of Carbon Steel Plate of Structural Quality for General ApplicationASTM A 36 covers Carbon Steel plate, shape, and bar of Structural Quality for use in riveted, bolted or welded construction of bridges and building and for General Structural purposeFrom material scope, both ASTM A 36 and ASTM A 283 are the Carbon Steel of Structural Quality for GeneralApplication

2. CHEMICAL COMPOSITION (Thickness up to 19 mm)

Material Chemical Composition (%)C Mn P S Si Cu

A 36 0,25 - 0,04 0,05 0,4 0,2A283 Gr C 0,24 0,9 0,035 0,04 0,4 0,2

The chemical composition between ASTM A36 and ASTM A 283 Gr C differ only on Mn content,The effect of Mn and other element to the weldability can be known by Carbon Equivalen (CE) calculation

The formula CE = C + Si/24 + Mn/6 + Ni/40 + Cr/5 + Mo/4 + V/4 (5.2)

where the element in % weigth

ASTM A 36 CE = 0.25 + 0.4 / 24

= 0.266 %

ASTM A 283 Gr CCE = 0.24 + 0.4/24 + 0.9/6 + 0 + 0 + 0 + 0

= 0.406 %

It seem that CE of A 283 Gr C is higher than ASTM A 36. Base on this A 283 Gr C is litte bit difficult to weld compare to A 36.Refering to ASME IX the weldability of material is classified in to P-Number. Both A 283 Gr C and A 36 is group in to the same P number 1. It mean that once we make the WPS/PQR with A-36, it also valid for A 283 Gr C.

(5.3)

3. MECHANICAL PROPERTIES

Material Yield Strength ksi(Mpa)

Tensile Strength ksi(Mpa)

Elongation8 inch

Elongation2 inch

A 36 36(250) 58-80 (400-550)

20 23

A 283Gr C

30(205) 55-75 (380-515)

22 25

The mechanical propertiies between A 36 and A 283 Gr C are almost the same which mean the mechanical prop range are not big different.

4. REFERENCE

5.1. ASTM A 36 & ASTM A 283 Gr C Vol. 01.04, Edition. 19985.2. Introduction to the Physical Metallurgy of Welding, Kenneth Easterling, Butterworth Heinemann, 19925.3. ASME IX Code : Welding and Brazing Qualification, Edition 1998

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