JIS G3302

  JIS G3302 is the production standard for Japanese galvanized coil strips. For galvanized coils, a thin steel plate is immersed in a molten zinc bath to adhere a layer of zinc to the surface. It is mainly produced by the continuous galvanizing process, that is, the rolled steel plate is continuously immersed in a plating bath containing molten zinc to form galvanized steel plate; alloyed galvanized steel plate.   This Standard specifies requirements for hot-dip zinc-coated steel sheets (hereafter referred to as sheets), steel strips (hereafter referred to as coils), and corrugated steel sheets manufactured by processing sheets into the shapes and dimensions specified in JIS G 3316 (hereafter referred to as corrugated sheets).

JIS G3302 Equivalent

Chinese standard: GBT 2518-2008 European standard: EN10147 American standard: ASTM A653M  

What is SGCC Steels?

 SGCC steel is a soft forming quality hot dip galvanized steel. SGCC is a material grade and designation defined in JIS G 3302 standard. JIS G 3302 is a Japanese material standard for hot dip galvanized steels. The commercial quality hot dip galvanized steel is a type of steel that can be made after galvanizing a coil of SPCC cold rolled material. The Zinc coating thickness is based on the thickness and width and is governed by JIS G 3302.    

JIS G3302 Specification

Based on Hot-roll Steel Sheet:

Grade	Thickness Range(mm)	Application
SGHC	1.60 ~ 6.00	Commercial
SGH340		High strength commercial
SGH400
SGH440
SGH490
SGH540

For those with a nominal thickness of 1.6 mm or over up to and in cluding 3.2 mm, unless the use of hot-rolled base metal is specifically required, the cold-reduced base metal which satisfies the specifications for hot-rolled base metal may be used. Based on Cold-roll Sheet:

Grade	Nominal Thickness	Application
SGCC	0.25 ~ 3.2	Commercial
SGCH	0.11 ~ 1.0	Commercial Hard
SGCD1	0.40 ~ 2.3	Drawing, Class 1
SGCD2		Drawing, Class 2
SGCD3	0.60 ~ 2.3	Drawing, Class 3
SGCD4	0.60 ~ 2.3	Drawing, Class 4
SGC340	0.25 ~ 3.2	Structural Quality
SGC400
SGC440
SGC490
SGC570	0.25 ~ 2.0

JIS G3302 Chemical Composition

Based on Hot-Roll Sheet(units:%):

Grade	C	Mn	P	S
SGHC	0.15max.	0.80max.	0.05max.	0.05max.
SGH340	0.25max.	1.70max.	0.20max.	0.05max.
SGH400	0.25max.	1.70max.	0.20max.	0.05max.
SGH440	0.25max.	2.00max.	0.20max.	0.05max.
SGH490	0.30max.	2.00max.	0.20max.	0.05max.
SGH540	0.30max.	2.50max.	0.20max.	0.05max.

Based on Cold-Roll Sheet (units:%):

Grade	C	Mn	P	S
SGCC	0.15 max.	0.80 max.	0.05 max.	0.05 max.
SGCH	0.18 max.	1.20 max.	0.80 max.	0.05 max.
SGCDl	0.12 max.	0.60 max.	0.04 max.	0.04 max.
SGCD2	0.10 max.	0.45 max.	0.03 max.	0.03 max.
SGCD3	0.08 max.	0.45 max.	0.03 max.	0.03 max.
SGC340	0.25 max.	1.70 max.	0.20 max.	0.05 max.
SGC400	0.25 max.	1.70 max.	0.20 max.	0.05 max.
SGC440	0.25 max.	2.00 max.	0.20 max.	0.05 max.
SGC490	0.30 max.	2.00 max.	0.20 max.	0.05 max.
SGC570	0.30 max.	2.50 max.	0.20 max.	0.05 max.

   

JIS G3302 Mechanical properties

 

Tensile test characteristics

  Based on Hot-Roll Sheet(units:%):

Grade	Yield strength	Tensile strength	Elongation %
	N/mm2	N/mm2	Thickness
			1.6-2.0MM	2.0-2.5MM	2.5-3.2MM	3.2-4.0MM	4.0-6.0MM
SGHC	–	–	–	–	–	–	–
SGH340	245 Min	340 Min	20 Min	20 Min	20 Min	20 Min	20 Min
SGH400	295 Min	400 Min	18 Min	18 Min	18 Min	18 Min	18 Min
SGH440	335 Min	440 Min	18 Min	18 Min	18 Min	18 Min	18 Min
SGH490	365 Min	490 Min	16 Min	16 Min	16 Min	16 Min	16 Min
SGH540	400 Min	540 Min	16 Min	16 Min	16 Min	16 Min	16 Min

NOTE 1 For SGHC, a yield point or proof stress of 205 N/mm2 or over and a tensile strength of 270 N/mm2 or over may be used. NOTE 2 1 N/mm2 = 1 MPa Based on Cold-Roll Sheet (units:%):

Grade	Yield strength	Tensile strength	Elongation %
	N/mm2	N/mm2	Thickness
			0.25-0.4MM	0.4-0.6MM	0.6-1.0MM	1.0-1.6MM	1.6-2.5MM
SGCC	–	–	–	–	–	–	–
SGCH	–	–	–	–	–	–	–
SGCD1	–	270 Min	32 Min	34 Min	36 Min	37 Min	38 Min
SGCD2	–	270 Min	–	36 Min	38 Min	39 Min	40 Min
SGCD3	–	270 Min	–	–	40 Min	41 Min	42 Min
SGCD4	–	270 Min	–	–	43 Min	43 Min	44 Min
SGC340	245 Min	340 Min	20 Min	20 Min	20 Min	20 Min	20 Min
SGC400	295 Min	400 Min	18 Min	18 Min	18 Min	18 Min	18 Min
SGC440	335 Min	440 Min	18 Min	18 Min	18 Min	18 Min	18 Min
SGC490	365 Min	490 Min	16 Min	16 Min	16 Min	16 Min	16 Min
SGC570	560 Min	570 Min	–	–	–	–	–

NOTE 1 For SGCC, a yield point or proof stress of 205 N/mm2 or over and a tensile strength of 270 N/mm2 or over may be used. NOTE 2 SGCH, not subjected to annealing, usually have a Rockwell hardness of 85 HRBW or over, or a Vickers hardness of 170 HV or over. NOTE 3 1 N/mm2 = 1 MPa Note a) The sheets and coils of SGCD4 shall be free from stretcher strain marks when being formed, for a period of six months after manufacture.  

Thickness Tolerances

  Tolerances on product thickness (applicable to SGHC)

Thickness (MM)	Width (MM)
	Under 1200	1200-1500	1500-1800	1800-2300
1.6-2.0	0.17	0.18	0.19	0.22
2.0-2.5	0.18	0.20	0.22	0.26
2.5-3.15	0.20	0.22	0.25	0.27
3.15-4.0	0.22	0.24	0.27	0.28
4.0-5.0	0.25	0.27	–	–
5.0-6.0	0.27	0.29	–	–
Above 6.0	0.30	0.31	–	–

    Tolerances on product thickness (applicable to SGH340,SGH400,SGH440,SGH490 and SGH540)

Thickness (MM)	Width (MM)
	Under 1600	1600-2000
1.6-2.0	0.20	0.24
2.0-2.5	0.21	0.26
2.5-3.15	0.23	0.30
3.15-4.0	0.25	0.35
4.0-5.0	0.46	–
5.0-6.0	0.51	–

    Tolerances on product thickness (applicable to SGCCSGCH,SGCD1 to SGCD4 and SGC340 to SGC570)

Thickness MM	Width MM
	Under 630	630-1000	1000-1250	1250-1600	Over 1600
Under 0.25	0.04	0.04	0.04	–	–
0.25-0.40	0.05	0.05	0.05	0.06	–
0.40-0.60	0.06	0.06	0.06	0.07	0.08r44
0.60-0.80	0.07	0.07	0.07	0.07	0.08
0.80-1.00	0.07	0.07	0.08	0.09	0.10
1.00-1.25	0.08	0.08	0.09	0.10	0.12
1.25-1.60	0.09	0.10	0.11	0.12	0.14
1.60-2.00	0.11	0.12	0.13	0.14	0.16
2.00-2.50	0.13	0.14	0.15	0.16	0.18
2.50-3.15	0.15	0.16	0.17	0.18	0.21
3.15-3.20	0.17	0.18	0.20	0.21	–