Japanese standard SM490YB welded structural steel

Japanese standard SM490YB welded structural steel is similar to the Chinese standard high weather resistance structural steel Q345GNHL, but it is not the same, and its composition and properties are somewhat different. SM490YB is a structural steel produced in accordance with the Japanese standard JIS G3106, with a strength σb of 490MPa. It is used for construction, bridges, ships, vehicles, construction machinery and other structural parts that require excellent welding performance, generally welding containers.

Chemical composition and melting analysis of SM490YB welded structural steel:

Grade	Thickness	C	Si	Mn	P	S
SM490YB	≤100mm	≤0.20	≤0.55	≤1.65	≤0.035	≤0.035

Mechanical properties of SM490YB 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	100<t≤200
SM490YB	≥365	≥355	≥335	≥325	490-610	-	≤5	≥19
							5<t≤16	≥15
							5<t≤50	≥19
							>40	≥21

SM490YB steel plate heat treatment process: hot rolling, normalizing, quenching + tempering or tempering.

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