الكربون الصلب المرجل أنابيب مبادل حراري أنابيب

CHEMICAL COMPOSITION % max

Steel Grade

C

Si

Mn

P

S

Cr

Mo

Ni

others

360

0.17

0.10-0.35

0.40-0.80

0.035

0.035

-

-

-

-

440

0.12-0.18

0.10-0.35

0.90-1.20

0.035

0.035

-

-

-

-

243

0.12-0.20

0.10-0.35

0.40-0.80

0.035

0.035

-

0.25-0.35

-

Al 0.012

620-460

0.10-0.15

0.10-0.35

0.4-0.7

0.03

0.03

0.7-1.10

0.45-0.65

-

Al 0.020

622-490

0.08-0.15

0.5

0.4-0.7

0.03

0.03

2.00-2.50

0.90-1.20

-

Al 0.020

629-470

0.15

0.25-1.00

0.30-0.60

0.03

0.03

8.00-10.00

0.90-1.10

-

Al 0.020

629-590

762

0.17-0.23

0.50

1.00

0.03

0.03

10.00-12.50

0.80-1.20

0.30-0.80

vanadium

0.25-0.35

Note:243,620-460,622-490,629-470,629-590 the following remaind elements shall not exceed Ni,0.30%;Cu ,0.25%;Sn,0.03%

MECHANICAL PROPERTIES min

Steel Grade

Tensile Strength Mpa

Yeild point or proof stress Mpa

Elongation %

360

360-500

235

24

440

440-580

245

21

243

480-630

275

22

620-460

460-610

180

22

622-490

490-640

275

20

629-470

470-620

185

20

629-590

590-740

400

18

762

720-870

470

15

Delivery condition

steel grade

Final supply condition

Temperature of heat treatment

360,440(seamless hot finished)

hot finished

-

360,440(seamless cold finished)

normalized

880-940

243(all manufacturing condition)

normalized

900-960

622-490(seamless)

normalized+tempered

normalized900-960
tempered680-750

629-470(seamless)

annealed

850-950

629-590(seamless)

normalized+tempered

normalized900-1000
tempered700-800

762(seamless)

normalized+tempered

normalized1020-1070
tempered730-780