BB503 - Q/BQB 130-2003

Grade	BB503
Corresponding Standard	Q/BQB 130-2003 Primary Rolled Slabs
Classification	Carbon Steel

BB503 Chemical Element Composition Content (%)

	Component	C	Si	Mn	P	S	Nb
适用成品板厚14~40mm	Minimum Value	0.1	0.2	1.1	-	-	-
适用成品板厚14~40mm	Maximum Value	0.19	0.5	1.6	0.03	0.025	0.04

	Component	C	Si	Mn	P	S	Nb
适用成品板厚40~65mm	Minimum Value	0.1	0.25	1.15	-	-	-
适用成品板厚40~65mm	Maximum Value	0.19	0.55	1.65	0.03	0.025	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.

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