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GALVANIZED STEEL

Galvanized steel is among the most popular steel types because of its extended durability, having the strength and formability of steel plus the corrosion protection of the zinc-iron coating. The zinc protects the base metal by acting as a barrier to corrosive elements, and the sacrificial nature of the coating results in a long-lasting and high-quality steel product.

This versatility makes it applicable to a variety of projects and industries, including agriculture, solar, automotive, construction, and so on. Below, we aim to provide a comprehensive description of how galvanized steel is processed, different galvanization methods, its benefits, and how it is used in these various industries.

If the varieties, specifications and special requirements of products are not covered in the manual, please feel free to contact us. Chenxin steel will reply you as soon as possible.

Grade and appliances

 

Steel Grade	Code Of Zinc Coating Weight	Executive Standard	Main Application
DX51D+Z ( STO2Z )			NORMAL
DX52D+Z ( STO3Z )			DRAWING
DX53D+Z ( STO4Z )	Z60-Z350	Q/ASB 385	DEEP DRAWING
S220GD+Z. S250GD+Z S280GD+Z. S320GD+Z S350GD+Z、S550GD+Z			CONSTRUCTION
SGCC			NORMAL
SGCD1			DRAWING
SGCD2、 SGCD3	Z60-Z350	Q/ASB 387	DEEP DRAWING
SGC34, SGC400S SGC440、 SGC490, SGC570			CONSTRUCTION
CSA、CSB、CSC			NORMAL
FS A、FS B	Z60-Z350 ( METRIC SYSTEM ) G20-G115 (ENGLISH SYSTEM )		DRAWING
DDSA、DDSC		Q/ASB 10	DEEP DRAWING
SS33(230)、SS37(255)、SS40(275) SS50(340)、SS80(550)			CONSTRUCTION

 

STANDARD AND PROPERTIES -DRAWING STEEL

Variety, surface structure and after-treatment mode of zinc coating

Item	Type
Variety Of Zinc Coating	Pure Zinc
Surface Structure	Normal Spangle
	No Spangle
	Skin-Passed Spangle
After-Treatment Mode	Normal Passivation
	Environmental Passivation
	Fingerprint Resistance
	Oiling
	Passivating And Oiling
Surface Quality Level	Normal Level
	High Level
	Higher Level

Steel grade and chemical composition Q/ASB 385

Steel grade	Chemical composition%, no greater than
	C	Si	Mn	P	S	Ti
DX51D+Z ( STO2Z ) DX52D+Z ( STO3Z ) DX53D+Z ( STO4Z )	0.12	0.50	0.60	0.10	0.03	0.3
S220GD+Z,S250GD+Z S280GD+Z,S320GD+Z S350GD+Z,S550GD+Z	0.20	0.60	1.70	0.10	0.035	–

Steel grade	Chemical composition%, no greater than
	C	Mn	P	S
SGCC	0.15	0.80	0.05	0.030
SGCD 1	0.12	0.60	0.04	0.030
SGCD2	0.10	0.45	0.03	0.030
SGCD 3	0.08	0.45	0.03	0.030
SGC340	0.25	1.70	0.20	0.035
SGC400	0.25	1.70	0.20	0.035
SGC440	0.25	2.00	0.20	0.035
SGC490	0.30	2.00	0.20	0.035
SGC570	0.30	2.50	0.20	0.035

Steel grade and chemical composition Q/ASB 387

Mechanical properties and processing properties of sheet and strip Q/ASB385

Steel grade	Tensile test
	Lower yield strength MPa	Tensile strength Rm MPa	Breaking elongation% (Lo=80mm,b=20mm )
			Not less than
DX51D+Z(StO2Z)	–	270-550	22
DX52D+Z ( StO3Z )	140-300	270-420	26
DX53D+Z ( StO4Z )	120-260	270-380	30
S220GD+Z	5=220	N300	20
S250GD+Z	5=250	5=330	19
S280GD+Z	N280	5=360	18
S320GD+Z	N320	5=390	17
S350GD+Z	5=350	>420	16
S550GD+Z	>550	N560	一

 

Mechanical properties and processing properties of sheet and strip Q/ASB 387

Steel grade	Tensile test
	Lower yield strength bK .MPa	Tensile strength Rm ,MPa	Breaking elongation (L(,=50mm,b=20mm )
	Not less than
SGCC	205	270
SGCD1	–	270	38
SGCD2	–	270	40
SGCD3	–	270	42
SGC340	245	340	20
SGC400	295	400	18
SGC440	335	440	18
SGC490	365	490	16
SGC570	560	570	–

 

Equivalent thickness of zinc coating (the sum thickness of two sides)

Code of zinc coating	Z80	Z90	Z100	Z120	Z140	Z150	Z160
Equivalent thickness of zinc coating mm	0.011	0.013	0.014	0.017	0.02	0.021	0.022
Code of zinc coating	Z180	Z200	Z220	Z225	Z250	Z270	Z275
Equivalent thickness of zinc coating mm	0.025	0.028	0.031	0.031	0.035	0.039	0.039