Comparison of Offshore Seamless Hollow Sections

Table 10 - Chemical Composition for Seamless Hollow Sections

Group

Steel

Name

Steel Number

C

max.

Si

Mn

P

max.

S

max.

Cr

max.

Mo

max.

Ni

max.

AJ(total)b

Cu

max.

N

max.

Nb

max.

Ti

max.

V

max.

Cr+Mo+Ni+Cu max.

Nb+V

max.

Nb+V+Ti max.

%

%

%

%

%

%

%

%

%

%

%

%

%

%

%

Ladle analysis

1

S355G1+N

1.8814+N

0.20

0.5

max.

0.90 to

1.65

0.035

0.030

0.30

0.10

0.50

0.020

min.

0.35

0.015

0.050

0.030

0.120

-

-

-

Ladle analysis

2

S355G14+Q C

S355G14+N C

1.1184+Q

1.1184+N

0.18

0.15

to

0.55

1.60

max.

0.025

0.010

0.25

0.08

0.30

0.06

max.

0.35

0.014

0.050

0.02

0.10

0.80

0.10

0.12

3

S355G15+N C

S355G15+Q C

1.1180+N

1.1190+Q

0.18

0.15

to

0.55

1.60

max.

0.025

0.007

0.25

0.08

0.30

0.06

max.

0.35

0.014

0.050

0.02

0.10

0.80

0.10

0.12

2

S420G6+Q C

1.8852+Q

0.16

0.15

to

0.55

1.00 to

1.65

0.025

0.007

0.25

0.25

0.65

0.06

max.

0.30

0.014

0.050

0.04

0.10

0.80

0.10

0.12

2

S460G6+Q C

1.8884+Q

0.16

0.15

to

0.55

1.00 to

1.65

0.025

0.010

0.25

0.25

0.65

0.06

max.

0.30

0.014

0.050

0.04

0.10

0.80

0.10

0.12

a . For product chemical composition variations see Table 12.

b . The total aluminium to nitrogen ratio shall be a minimum of 2:1. When other nitrogen binding elements are used, the minimum Al value and Al:N ratio does not apply.

c . The levels of global health rx the residual elements arsenic, antisenic, antimony, tin, lead, bismuth and rx health mart calcium shall not exceed 0,02% As, 0,010% Sb, 0,020% Sn, 0,010% Pb, 0.010%

Bi and 0,005% Ca. Boron (B) shall not exceed 0,000 5%. These elements shall be checked at least once every 5 000 tonnes at each manufacturing location and shall

be reported as a ladle analysis.



Table 11 - Mechanical Properties for Seamless Hollow Sections

Group

Steel name

Steel number

Tensile strength Rm

Minimum yield strength ReH

for thickness

t (mm)a

Minimum elongation

A on gauge length of 5,65 √S°

Minimum average Charpy V-notch impact test value

t ≤ 20

20 < t ≤ 40

R e ∫ R m

Temp.

Energy

MPa b

MPa b

MPa b

max. ratio

%

°C

J

1

S355G1+N

1.8814+N

470 to 630

355

345

0.88

22

-20

50

2

S355G14+N

S355G14+Q

1.1184+N

1.1184+Q

460 to 620

355

345

0.88

22

-40

50

3

S355G15+N

S355G15+Q

1.1190+N

1.8852+Q

460 to 620

355

345

0.88

22

-40

50

2

S420G6+Q

1.8852+Q

500 to 690

420

400

0.90

22

-40

60

2

S460G6+Q

1.8884+Q

550 to 700

460

440

0.90

19

-40

60

a . When agreed at the time of enquiry and order, hollow sections with thicknesses greater than specified shall be supplied,

see option 25.

b. 1 MPa = 1 N/mm2