SM490B Structural Steel Reference

Description: SM490B weather-resistant steel is a Japanese standard steel plate, and SM490B steel plate implements JIS G3106 standards. SM490B weather-resistant steel has good mechanical properties, corrosion resistance, and chemical properties...

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SM490B weather-resistant steel Description

SM490B Structural Steel Reference. Check the complete grade, product form, applicable edition and ordered dimensions.

Describe the exposure, drainage, surface preparation and any coating requirement. Confirm the grade designation and finish with the designer.

SM490B weather-resistant steel is a Japanese standard steel plate, and SM490B steel plate implements JIS G3106 standards. SM490B weather-resistant steel has good mechanical properties, corrosion resistance, and chemical properties, and is widely used in mechanical manufacturing, steel structure welding, large building structures (such as bridges, train stations, factories, high-rise buildings, etc.), ships, rail vehicles, oil storage tanks, containers, and other fields that require advanced weldability.

Legacy technical note · verification required

SM490B low-alloy high-strength steel is a hot-rolled steel plate with good welding performance. The SM490B weather-resistant steel plate has a yield strength of not less than 490MPa and a tensile strength of not less than 325MPa. In order to improve the surface quality and corrosion resistance of the steel, the SM490B steel plate may require acid pickling during production. The acid pickling process mainly includes pre-treatment, acid pickling, water washing, passivation, and post-treatment steps.

SM490B weather-resistant steel Datasheet

Thickness：12.1-50mm
Width：1501-1800mm
Length：6001-12000mm
Certificate：API, PVOC, SONCAP, SABS, sirm, tisi, KS, ISO9001, ABS, BV, NK, RINA, PRS, VR, KR, CCS
Processing Service：Welding, Punching, Cutting, Bending, Decoiling
SGS BV inspection：Available, other third party inspection also available
Mill Test Certificate：EN10204 3.1 MTC, 3.2 MTC available
Advantage：Accept Customize Production
Payment term：L/C T/T (30% Deposit)

SM490B weather-resistant steel Chemical composition

Legacy technical table · verification required

Confirm every value against the applicable edition, thickness and material certificate.

Legacy technical table
Grade	The Element Max (%)
Grade	C	Si	Mn	P	S	Cu	Ni	Cr	Mo
SM490B	0.18	0.55	1.60	0.035	0.035	0.30	0.30	0.30	0.10

Carbon is the main reinforcing element of steel and can increase its strength and hardness.

Silicon and manganese can enhance the toughness and ductility of steel and improve its plasticity and impact resistance.

SM490B weather-resistant steel Mechanical Properties

Legacy technical table · verification required

Confirm every value against the applicable edition, thickness and material certificate.

Legacy technical table
Grade	SM490A Mechanical Property
Grade	Thickness	Yield	Tensile	Elongation
SM490B	mm	Min Mpa	Mpa	Min %
	t≦16	325	490-610	17
	16<t≦90	295-315	490-610	22

Legacy technical note · verification required

SM490B steel plate delivery status: steel plates with thickness <80mm, the delivery status is hot rolled; steel plates with thickness ≥80mm, the delivery status is normalized, the delivery status can also be specified according to technical requirements.

SM490B steel plate thickness direction performance requirements: Z15, Z25, Z35.

Equivalent Grade of SM490B weather-resistant steel

Legacy technical table · verification required

Confirm every value against the applicable edition, thickness and material certificate.

Legacy technical table
Japan	Europe	Belgium	Germany	France	Italy	China	Spain	USA
SM490B	P355N (1.0562)	AE 355 B	StE355	A510AP E355R	FeE355KG	20#	AE355KG	A537CL1

Source and scope

JIS G 3106:2024, Japanese Standards Association · English preview, scope. JIS G 3106 concerns rolled steels for welded structure. Confirm the exact suffix and inspection requirements before specifying the material.

Apply the cited scope to the matching designation and form. Confirm any remaining technical values with the applicable edition or material certificate.

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