SM490B steel plate properties and heat treatment

SM490B steel plate technical standard JISG 3106-2004.

Melting analysis of chemical composition of SM490B steel plate:

Grade	Thickness	C	Si	Mn	P	S
SM490B	t≤50mm	≤0.18	≤0.55	≤1.65	≤0.035	≤0.035
	50<t≤200mm	≤0.20

Mechanical properties, yield tensile strength of SM490B steel plate:

Grade	Yield point or yield strength,N/m㎡						Tensile strength		Elongation
	Thickness mm						Thickness mm		Thickness mm	%
	≤16	16<t≤40	40<t≤75	75<t≤100	100<t≤160	100<t≤200	≤100	100<t≤200
SM490B	≥325	≥315	≥295	≥295	≥285	≥275	490-610	490-610	≤5	≥22
									5<t≤16	≥17
									5<t≤50	≥21
									>40	≥23

SM400B steel plate heat treatment:
On request, the steel can be normalized, quenched and tempered or tempered.

Heat treatment mark:
When the steel is heat treated, the code indicating the heat treatment shall be in accordance with the following provisions.
a) When normalizing steel: N
b) When tempering steel: T
c) When quenching and tempering steel: Q
d) Controlled rolling of steel: TMC