A36 &A283C
COMPARISON BETWEEN ASTM A 36 AND 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 Application ASTM 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 purpose From material scope, both ASTM A 36 and ASTM A 283 are the Carbon Steel of Structural Quality for General Application 2. CHEMICAL COMPOSITION Material C 0,25 0,24
A 36 A283 Gr C
(Thickness up to 19 mm)
Chemical Composition (%) Mn P S 0,04 0,05 0,9 0,035 0,04
Si 0,4 0,4
Cu 0,2 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 where the element in % weigth
(5.2)
ASTM A 36 CE = 0.25 + 0.4 / 24 = 0.266 % ASTM A 283 Gr C CE = 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)
Elongation Elongation 8 inch 2 inch
A 36
36(250)
58-80 (400-550)
20
23
A 283 Gr 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. CONCLUSION Base on the above explanation, it can consider that A 36 can be used to alternative substitution of A 283 Gr C. In order to decide A 36 as substitution of A 283 Gr C further Engineering approval is required.
5. REFERENCE 5.1. ASTM A 36 & ASTM A 283 Gr C Vol. 01.04, Edition. 1998 5.2. Introduction to the Physical Metallurgy of Welding, Kenneth Easterling, Butterworth Heinemann, 1992 5.3. ASME IX Code : Welding and Brazing Qualification, Edition 1998
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