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You are here : BEBON STEEL > news > Views - Steel Plate GY4,28Cr2Mo

Steel Plate GY4,28Cr2Mo

GY4,28Cr2Mo Scope The technical conditions apply to plates of GY4, 28Cr2Mowith thickness not more than 150mm. (8mm-150mm)
Thickness tolerance: +/-1.52mm
Flatness: 4mm/m
Surface shot blasting or peeled.
Technical conditions Chemical composition (Ladle analysis)Grain size Grain size for plates shall be according to GY4,28Cr2Mo Surface quality The surface quality of plates shall be accordance with ASTM A6/A6M.
The third party inspection:
Delivery conditions The delivery conditions for plates of GY4,28Cr2Moshall be high temperature tempering. Other requirements MTC accordance with EN10204: 2004 3.1 Parameter The chemical composition of plates shall be accordance with the following table 1. Table 1 Chemical composition (Ladle analysis)

C

Si

Mn

P

S

Cr

Ni

Mo

0.23-0329

1.20-1.60

1.20-1.60

Max0.030

Max0.030

Max0.30

Max0.50

0.15-0.25


Note: Per furnace analysis [N] not more than 80ppm, [O] not more than 30ppm. Steel making process: EAF+LF/VD Carbon equivalent (CEq) Carbon equivalent shall be not more than 0.76 for plates of GY4,28Cr2Mo. Carbon equivalent shall be calculated as follows: CEq=C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15 (%) inspecton of quality conformity

No

test item

sample quantity

sampling location

Request Chapter No.

test method chapter No

1

chemical

1(every bolier)

GB222

3.2

4.3.1

2

impact test

4

4.2.2.2

3.4

4.3.2

3

hardness

2-3

4.2.2.3

3.4

4.3.3

4

Fracture

2

4.2.2.4

3.5

4.3.4

5

UT test

each

entire

3.6

4.3.5

6

Size,surface

each

entire

3.7

4.3.6

7

appearancequality

each

entire

3.8

4.3.7

8

ballisticperformance

1-2

4.2.2.5

3.9

4.3.8


Related steel grade:

603

GY4

GY5

675

30CrMnMoRE

28Cr2Mo

26SiMnMo

30CrNi3MoV