JIS G 3103 SB 450 steel,JIS G 3103 SB 450 steel Chemical Composition

JIS G 3103 SB 450 steel is mainly used to  for manufacturing boilers, pressure vessels and pipes transporting hot liquids.

There are five main elements in JIS G 3103 SB 450 steel, carbon(C), manganese(Mn), phosphorus(P), sulfur(S) and silicon(Si).

JIS G 3103 SB 450 steel Chemical Composition specific data is as follows:

C  %    0.08-0.2
Mn %    0.90-1.50
P  %    0.025
S  %    0.015
Si %     0.40

In general, sulfur in general is also harmful element. Sulfur makes steel produce heat, reduces the ductility and toughness, cause cracks in forging and rolling. Sulfur on welding performance is also negative, reduces corrosion resistance. So usually requires steel contain sulfur less than 0.055%, high quality steel requires less than 0.040%. Adding 0.08-0.20% sulfur to steel can improve the machinability, is usually called free cutting steel.

Through the above data, JIS G 3103 SB 450 steel contains 0.015% sulfur, 0.015% sulfur improves JIS G 3103 SB 450 steel machinability, JIS G 3103 SB 450 steel belongs to high quality steel and free cutting steel.

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