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Specification


Mechanical Properties (using cold-rolled base metal)


Code

Yield Point
(N/m
)

Tensile
Strength
(N/m
)

Elongation rate (%)

Sample

Thickness (mm)

≥0.25
<0.4

≥0.40
<0.60

≥0.60
<1.0

≥1.0
<1.6

≥1.6
<2.5

≥2.5

SGCC

__

__

__

__

__

__

__

__

#5 Rolling
Direction

SGCH

__

__

__

__

__

__

__

__

SGCD1

__

≥270

__

≥34

≥36

≥37

≥38

__

SGCD2

__

≥270

__

≥36

≥38

≥39

≥40

__

SGCD3

__

≥270

__

≥(38)*

≥40

≥41

≥42

__

SGC340

≥245

≥340

≥(20)*

≥20

≥20

≥20

≥20

≥20

SGC400

≥295

≥400

≥(18)*

≥18

≥18

≥18

≥18

≥18

SGC440

≥335

≥440

≥(18)*

≥18

≥18

≥18

≥18

≥18

SGC490

≥365

≥490

≥(16)*

≥16

≥16

≥16

≥16

≥16

SGC570

≥560

≥570

__

__

__

__

__

__

Note(*): The figure in the parentheses is subject to the agreement of the supplier and the purchaser.


Remark 

1. For the steel sheet and steel strip of sgcd3, the manufacturer shall guarantee the non-aging for six months if non-aging is specified. The “Non-aging” refers to the property that no stretching strain occurs during the machining.
2. For those in thickness <0.25, tensile test is not applicable in principle.

Reference

1. Yield point of common sgcc≥205N/mm, for reference.
2. sgch is a sort of material without anneal, with regular rockwell hardness ( ) or vickers hardness for reference.


Adhesion amount of Zinc

g/m²

Code of adhesion
amount

Average adhesion amount
withtwo sides and three
pointsmethod

Minimal adhesion amount
with twosides and
one point method

Similar specification
( indicated code )

JIS G3302

Z10

100

85

Z10 F10

Z12

120

102

Z12 F12

Z18

180

153

Z18 F18

Z20

200

170

Z20

Z22

220

187

Z22

Z25

250

213

Z25

Z27

275

234

Z27

The two sides and three points method is applicable to three test pieces, whose test value is the average value.

The two sides and one point method is applicable to three test pieces, whose test value is the minimal value. 
It can be negotiated if the client has special requirements.


Thickness Tolerance (using cold-rolled base metal)

(㎜)

Thickness / Width

720 - 999

1000 - 1250

<0.25

±0.04

____

≥0.25<0.40

±0.05

±0.06

≥0.40<0.60

±0.06

±0.07

≥0.60<0.80

±0.07

±0.08

≥0.80<1.00

±0.08

±0.10

≥1.00<1.25

±0.09

±0.11

≥1.25<1.60

±0.11

±0.03

Thickness reference of Dalian Posco: thickness of base


Width Tolerance of Galvanized Sheet

(㎜)

Classification

Common Precision

High Precision

Tolerance of the size ordered

0 ~ +7

0 ~ +2


Zinc Coat Thickness of Each Designation

(㎜)

Code of adhesion amount

Z10

Z12

Z18

Z20

Z22

Z25

Z27

Z35

Z45

Thickness of zinc coat

0.021

0.026

0.034

0.040

0.043

0.049

0.054

0.064

0.080


mical and anticorrosion treatment of galvanized sheet


Classification

Chromate treatment

No treatment

Oiling

No oiling

Symbol

C

X

O

X