Case-Tianjin Xinmaotai Steel Co., Ltd.

Through electrolytic galvanizing, a uniform and dense zinc layer is finally formed on the surface of the steel, but the mechanical properties of the material are still maintained. Electrogalvanized steel is usually sold in coil or sheet form. EG coil is a kind of material that can be cut, slitted and profiled for other purposes. The steel grade of galvanized steel consists of base metal grade, galvanized (E), galvanized layer type and weight. The electro-galvanized products based on SPCC, SPCD, SPCE, SPCF and SPCG are named SECC, SECD, SECE, SECF and SECG respectively.

Full Cold Galvanizing Process:

Chemical degreasing → hot water washing → water washing → electrolytic degreasing → water washing → acid washing → rust removal → water washing → electrogalvanizing process → water washing → passivation → hot water washing → drying → quality inspection → packaging and sales

Chemical composition

Standard	Grade	C	Si	Mn	P	S	Ti
Forcold forming Chinese Standard	DX51D Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX52D With	0.12	0.50	0.60	0.100	0.045	0.30
	DX53D Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX54D Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX56D Z	0.12	0.50	0.60	0.100	0.045	0.30
	DX57D Z	0.12	0.50	0.60	0.100	0.045	0.30
Forcold forming Japanese Standard	SGCC	0.15	0.50	0.80	0.050	0.030	0.025
	SGCD1 SGCD2	0.12 0.10	0.50 0.50	0.60 0.45	0.040 0.030	0.030 0.030	0.025 0.025
	SGCD3	0.08	0.50	0.45	0.030	0.030	0.025
	SGCD4	0.06	0.50	0.45	0.030	0.030	0.025
ForStructure Japanese Standard	SGC340	0.25	0.50	1.70	0.200	0.035	0.025
	SGC400 SGC440	0.25 0.25	0.50 0.50	1.70 2.00	0.200 0.200	0.035 0.035	0.150 0.150
	SGC490	0.30	0.50	2.00	0.200	0.035	0.025
	SGC510	0.30	0.50	2.50	0.200	0.035	0.025
ForStructure AISI Standard	S220GD Z	0.20	0.60	0.70	0.100	0.045	0.025
	S250GD With	0.20	0.60	0.70	0.100	0.045	0.025
	S280GD Z	0.20	0.60	0.70	0.100	0.045	0.025
	S320GD Z	0.20	0.60	0.70	0.100	0.045	0.025
	S350GD Z	0.20	0.60	0.70	0.100	0.045	0.150
	S550GD Z	0.20	0.60	0.70	0.100	0.045	0.150

Mechanical properties

Grade	Yield strength MPa≥	Tensile Strength MPa≥	Elongation A%≥
DX51D Z/ZM/AZ/AM	240-380	270-500	22
DX52D Z/ZM/AZ/AM	140-300	270-420	26
DX53D Z/ZM/AZ/AM	140-260	270-380	30
DX54D Z/ZM/AZ/AM	120-220	260-350	36
S220GD Z/ZM/AM	220	300	20
S250GD Z/ZM/AZ/AM	250	330	19
S280GD Z/ZM/AM	280	360	18
S300GD A/AM	300	380	18
S320GD Z/ZM/AM	320	390	17
S350GD Z/ZM/AZ/AM	350	420	16
S450GD A/AM	450	480	15
S550GD Z/ZM/AZ/AM	550	550	-