SM520B - Q/BQB 130-2003

Grade	SM520B
Corresponding Standard	Q/BQB 130-2003
Classification	Carbon Steel

SM520B Chemical Element Composition Content (%)

	Component	C	Si	Mn	P	S	Nb
适用成品板厚1.4~9mm	Minimum Value	0.12	-	0.9	-	-	-
适用成品板厚1.4~9mm	Maximum Value	0.21	0.25	1.4	0.035	0.035	0.04

	Component	C	Si	Mn	P	S	Nb
适用成品板厚>9~12mm	Minimum Value	0.06	0.2	1.1	-	-	-
适用成品板厚>9~12mm	Maximum Value	0.15	0.6	1.6	0.035	0.035	0.04

①Deoxidation method : C--Cap steel；A--aluminum-killed steel；G-aluminum--silicon killed steel；K--silicon killed steel
②For thick plates (thickness ≥ 15mm), the slabs should be aluminum-silicon killed steel slabs.

SM520B Corresponding Standards(Same grade name, different standards)

1	JIS G 3106-2008
	SM520B
2	Q/ASB 320-2017
	SM520B
3	Q/BQB 303-2018
	SM520B
4	Q/BQB 130-2003
	SM520B

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