Large Thick Wall Steel Pipehigh Pressure Boiler Tube, Oil Cracking Pipe Low Temperature Pipe

1

Specification

GB/T3639 , ASTM A519, ASTM A513, DIN2391, EN10305-1, EN10305-2

2

Delivery status

Stress Released Annealing (+SR) Or As per request Normalization (+N) Quenched and Tempered (+QT) As drawn no heat treated (+C)

3

OD Tolerance

OD< 40 mm

+/-0.1mm

40 to 100 mm

+/-0.15mm

100 to 200 mm

+/-0.2mm

200 to 300 mm

+/-0.25mm

300 to 400 mm

+/-0.3mm

4

WT Tolerance:

OD<100mm

+/-5%

OD>100mm

+/-7.5%

DOM tubes have better wall thickness variance +/-2.5%

5

Straightness

<0.3/1000mm

6

ID Tolerance

ISO H8 for honed/SRB tubes

7

ID Roughness

Ra ≤0.4um for honed/SRB tubes

8

Length:

5.0-5.8m to fit into a 20 foot container 11-11.6m to fit into a 40 foot container

9

Tolerance for fixed length

LG<500mm

+2mm

500 to 2000mm

+5mm

2000 to 5000mm

+10mm

5000 to 7000mm

+20mm

10

Stenciling

Mill name + specification + delivery status + Steel Grade + Size + Heat No

11

Anti Rust

High quality anti rust oil was applied on inside of the tube to gurantee no rust inside of the tubes for 6 months

12

Tubes end

Plain ends with plastic caps on both ends

13

Packing

Hexagonal packing ,wrapped with plastic sheets inside and woven cloth outside of the package

Grade

Application

Delivery Status

Yield Strength (Mpa)

Tensile Strength (Mpa)

Elongation (%)

Hardness (HBW)

Impact Energy (J)

ST37-2

Cylinder barrel

+SR

420

550

12

170-210

45#

Cylinder barrel

+N/+SR

480

620

15

190-230

30 (20ºC)

ST52

Cylinder barrel

+SR

520

600

17

190-230

27 (-20ºC)

1026

Cylinder barrel

+N/+SR

520

600

17

190-230

30 (20ºC)

27SiMn

Hydraulic Prop

+QT/+SR

720

860

12

230-280

30 (20ºC)

Grade

C

Si

Mn

P ≤

S ≤

ST37-2

≤0.24

0.17-0.37

≤0.6

0.035

0.035

45#

0.42-0.50

0.17-0.37

0.50-0.80

0.035

0.035

ST52

≤0.22

≤0.55

≤1.6

0.025

0.025

1026

0.22-0.28

0.15-0.35

0.60-0.90

0.04

0.05

27SiMn

0.24-0.32

1.10-1.40

1.10-1.40

0.035

0.035