API 5L Grade B

API 5L Grade B

API 5L Grade B Carbon Steel Pipe is utilized for transportation in critical sectors such as oil and gas, petroleum, and petrochemicals. Because of the low cost of the API 5L Grade B Welded Pipe, as well as crucial features like tensile strength and mild corrosion resistance, the specified API 5L Grade B pipes Manufacturers from carbon steel may be used for demanding applications in the aforementioned industries. Carbon steel API 5L Grade B pipes, for example, are utilized in the transportation of fluids such as water, oil, chemicals, gas, and steam from offshore to refineries.

The API 5L specification, or American Petroleum Institute specification, covers not just welded API 5L Grade B sch40 line pipes, but also API 5L Grade B Pipe built for transportation networks. The technical committee in charge of writing these standards identified the necessity for the addition of two PSL, or product specification levels, for the API 5L Grade B Pipe. While the API 5L Grade B PSL1 Pipe has been regarded as the quality standard for line pipes, the API 5L Grade B PSL2 Pipes are said to be superior in terms of chemical and mechanical qualities. Because the specified PSL2 API 5L Grade B ERW Pipes have been subjected to strict quality testing, they perform better than PSL1 pipes. Extra strong threaded and standard weight API 5L Grade B Line Pipes are also covered by the specification.

PRODUCT FEATURES

API 5L gRADE B Pipe Chemical Composition

- Chemical Composition for API 5L Grade B PSL 1 pipe with t ≤ 0.984”

Steel Grade

Mass fraction, % based on heat and product analyses a,g

C

Mn

P

S

V

Nb

Ti

max b

max b

max

max

max

max

max

Welded Pipe

Grade B

0.26

1.2

0.3

0.3

c,d

c,dd

a. Cu ≤ = 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; and Mo ≤ 0.15%,
b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum concentration for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; and up to a maximum of 2.00% for grade L485 or X70.,
c. Unless otherwise agreed NB + V ≤ 0.06%,
d. Nb + V + TI ≤ 0.15%,
e. Unless otherwise agreed.,
f. Unless otherwise agreed, NB + V = Ti ≤ 0.15%,
g. No deliberate addition of B is permitted and the residual B ≤ 0.001%

- Chemical Composition for API 5L Grade B PSL 2 Pipe with t ≤ 0.984”

Steel Grade

Mass fraction, % based on heat and product analyses

Carbon Equiv a

C

Si

Mn

P

S

V

Nb

Ti

Other

CE IIW

CE Pcm

max b

max

max b

max

max

max

max

max

max

max

Welded Pipe

Grade BM

0.22

0.45

1.2

0.025

0.015

0.05

0.05

0.04

e,l

0.43

0.25

a. SMLS t>0.787”, CE limits shall be as agreed. The CEIIW limits applied if C > 0.12% and the CEPcm limits apply if C ≤ 0.12%,
b. For each reduction of 0.01% below the specified maximum for C, an increase of 0.05% above the specified maximum for Mn is permissible, up to a maximum of 1.65% for grades ≥ L245 or B, but ≤ L360 or X52; up to a maximum of 1.75% for grades > L360 or X52, but < L485 or X70; up to a maximum of 2.00% for grades ≥ L485 or X70, but ≤ L555 or X80, and up to a maximum of 2.20% for grades > L555 or X80.,
c. Unless otherwise agreed Nb = V ≤ 0.06%,
d. Nb = V = Ti ≤ 0.15%,
e. Unless otherwise agreed, Cu ≤ 0.50%; Ni ≤ 0.30% Cr ≤ 0.30% and Mo ≤ 0.15%,
f. Unless otherwise agreed,
g. Unless otherwise agreed, Nb + V + Ti ≤ 0.15%,
h. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 0.50% Cr ≤ 0.50% and MO ≤ 0.50%,
i. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.50% and MO ≤ 0.50%,
j. B ≤ 0.004%,
k. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.55%, and MO ≤ 0.80%,
l. For all PSL 2 pipe grades except those grades with footnotes j noted, the following applies. Unless otherwise agreed no intentional addition of B is permitted and residual B ≤ 0.001%.

API 5L Grade b Pipe Mechanical Properties

- Mechanical Properties for API 5L Grade B PSL-1 Pipe

Pipe Grade

Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 1

Seam of Welded Pipe

Yield Strength a

Tensile Strength a

Elongation

Tensile Strength b

Rt0,5 PSI Min

Rm PSI Min

(in 2in Af % min)

Rm PSI Min

Grade B

35,500

60,200

c

60,200

a. For intermediate grade, the difference between the specified minimum tensile strength and the specified minimum yield for the pipe body shall be as given for the next higher grade.
b. For the intermediate grades, the specified minimum tensile strength for the weld seam shall be the same as determined for the body using footnote a.
c. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:
Where C is 1 940 for calculation using Si units and 625 000 for calculation using USC units
Axc   is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches), as follows
– For circular cross-section test pieces, 130mm2 (0.20 in2) for 12.7 mm (0.500 in) and 8.9 mm (.350 in) diameter test pieces; and 65 mm2 (0.10 in2) for 6.4 mm (0.250in) diameter test pieces.
– For full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
– For strip test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch)

- Mechanical Properties for API 5L Grade B PSL-2 Pipe

Pipe Grade

Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 2

Seam of Welded Pipe

Yield Strength a

Tensile Strength a

Ratio a, c

Elongation

Tensile Strength d

Rt0,5  PSI Min

Rm  PSI Min

R10,5IRm

(in 2in)

Rm (psi)

Af %

Minimum

Maximum

Minimum

Maximum

Maximum

Minimum

Minimum

Grade

BR, BN, BQ, BM

35,500

65,300

60,200

95,000

0.93

f

60,200

a. For intermediate grade, refer to the full API5L specification.
b. for grades > X90 refers to the full API5L specification.
c. This limit applies for pies with D> 12.750 in
d. For intermediate grades, the specified minimum tensile strength for the weld seam shall be the same value as was determined for the pipe body using foot a.
e. for pipe requiring longitudinal testing, the maximum yield strength shall be ≤ 71,800 psi
f. The specified minimum elongation, Af, expressed in percent and rounded to the nearest percent, shall be determined using the following equation:
Where C is 1 940 for calculation using Si units and 625 000 for calculation using USC units
Axc   is the applicable tensile test piece cross-sectional area, expressed in square millimeters (square inches), as follows
– For circular cross-section test pieces, 130mm2 (0.20 in2) for 12.7 mm (0.500 in) and 8.9 mm (.350 in) diameter test pieces; and 65 mm2 (0.10 in2) for 6.4 mm (0.250in) diameter test pieces.
–  For full-section test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified outside diameter and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
–  For strip test pieces, the lesser of a) 485 mm2 (0.75 in2) and b) the cross-sectional area of the test piece, derived using the specified width of the test piece and the specified wall thickness of the pipe, rounded to the nearest 10 mm2 (0.10in2)
   U is the specified minimum tensile strength, expressed in megapascals (pounds per square inch
g. Lower values fo R10,5IRm may be specified by agreement
h. for grades > x90 refers to the full API5L specification.

Dimensions and Sizes of API 5L Grade B Line Pipe

NPS

O. D.

Nominal Wall Thickness

DN

Inch

mm

SCH5S

SCH10S

SCH10

SCH20

SCH30

SCH40

SCH60

SCH80

SCH100

SCH120

SCH140

SCH160

STD

XS

XXS

 

50

2″

60.3

1.65

2.77

3.91

5.54

8.74

3.91

5.54

11.07

 

65

2 1/2″

73

2.11

3.05

5.16

7.01

9.53

5.16

7.01

14.02

 

80

3″

88.9

2.11

3.05

5.49

7.62

11.13

5.49

7.52

15.24

 

90

3 1/2″

101.6

2.11

3.05

5.74

8.08

5.74

8.08

 

100

4″

114.3

2.11

3.05

6.02

8.58

11.13

13.49

6.02

8.56

17.12

 

125

5″

141.3

2.77

3.4

6.55

9.53

12.7

15.88

6.55

9.53

18.05

 

150

6″

168.3

2.77

3.4

7.11

10.97

14.27

18.26

7.11

10.97

21.95

 

200

8″

219.1

2.77

3.76

6.35

7.04

8.18

10.31

12.7

15.09

18.26

20.62

23.01

8.18

12.7

22.23

 

250

10″

273.1

3.4

4.19

6.35

7.8

9.27

12.7

15.09

18.26

21.44

25.4

28.58

9.27

12.7

25.4

 

300

12″

323.9

3.96

4.57

6.35

8.38

10.31

14.27

17.48

21.44

25.4

28.58

33.32

9.53

12.7

25.4

 

350

14″

355.5

3.96

4.78

6.35

7.92

9.53

11.13

15.09

19.05

23.83

27.79

31.75

35.71

9.53

12.7

 

400

16″

406.4

4.19

4.78

6.35

7.92

9.53

12.7

16.66

21.44

26.19

30.96

36.53

40.49

9.53

12.7

 

450

18″

457.2

4.19

4.78

6.35

7.92

11.13

14.27

19.05

23.83

39.36

34.93

39.67

45.24

 

500

20″

508

4.78

5.54

6.35

9.53

12.7

15.09

20.62

26.19

32.54

38.1

44.45

50.01

 

550

22″

558.8

4.78

5.54

6.35

9.53

12.7

22.23

28.58

34.93

41.28

47.63

53.98

 

600

24″

609.6

5.54

6.35

6.35

9.53

14.27

17.48

24.61

30.96

38.89

46.02

52.37

59.54

 

API 5L Grade B Roughness

The roughness of API 5L Grade B is not defined, the new commercial pipe is approx. 0.0018 in x 25.4 = 0.04572 mm. As per the engineers, there is no guarantee it will be better, or worse.

API 5L Grade B Pipe Tolerance

O.D. Tolerance

W.T. Tolerance

Grade B

D < 60.3mm

+0.41/-0.40mm

D < 73mm

+20%/-12.5%

D ≥ 60.3m

+0.75/-0.40mm

D ≥ 73mm

+15%/-12.5%

Specification of API 5L Grade B Pipe

API 5L Grade B Pipe Sizes

Nominal Pipe Size 1/2″ to 48 ” O.D.
API 5L Grade B Pipe Wall Thickness – Schedule 10 through 160, STD, XS, XXS.

Product Specification Level (PSL)

API 5L Grade B PSL-2

API 5L Grade B PSL-1

API 5L Grade B Pipe Thickness

SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XS, SCH XXS, All API 5L Grade B Pipe Thickness available

API 5L Grade B Pipe End

Plain, Bevel, Screwed, Threaded l245 pipe

API Grade B Line Pipe Length

Single Random, Double Random & Required Length, Custom Size – 12 Meter lengths

Finishes of API 5L Grade B Pipe

3LPE, 3LPP, Bare, Oiled, Mill Varnish, Galvanizing, FBE Dual, Coal Tar, Concrete Coating, and Tape Wrap Grade B Pipe.
End Finishes: Square Cut, Threaded, Coupled, Beveled API 5L Grade B Pipe

API 5L Grade B Line Pipe HS Code

730420 Casing, tubing, and Grade B drill pipe, of a kind used in drilling for oil or gas: Casing:

730439 Other Tubes, Grade B Pipes, and Hollow Profiles, of Iron or Non-alloy Steel

730410 Grade B Line pipe of a kind used for oil or gas pipelines: Of iron or nonalloy steel:

730441 Tubes, Pipes, and Hollow Profiles, of stainless steel, Cold-drawn or cold-rolled (cold reduced)

730451 Tubes, Pipes, and Hollow Profiles, of Other Alloy Steel, Cold-drawn or cold-rolled (cold reduced)

730459 Other Tubes, Grade B Pipes and Hollow Profiles, of Other Alloy Steel,

730490 Other Tubes, Grade B Pipes and Hollow Profiles, Seamless, of Iron or Steel

730449 Other Tubes, Grade B Pipes and Hollow Profiles, of Stainless Steel, Seamless

730431 Tubes, Grade B Pipes and Hollow Profiles, of Iron or Non-alloy Steel, Cold-drawn or cold-rolled (cold reduced)

Delivery Condition for API 5L Grade B Line Pipe

PSL

Delivery Condition

Pipe Grade

PSL-1

As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized, and tempered, or if agreed Q&T SMLS only

Grade B

PSL-2

As-rolled

Grade BR

Test and inspection of API 5L Grade B Line pipes

- Hydrostatic Test

The pipe must be able to survive a hydrostatic test without leaking through the weld seam or the pipe body. Jointers do not need to be hydrostatically tested if the pipe sections utilized have been successfully tested.

- Bend Test

There shall be no cracks in any part of the test piece, nor shall there be any opening of the weld.

- Flattening Test

The flattening test method is used to evaluate and exhibit the deformation performance of line pipe to the prescribed size. The flattening test will reveal the pipe’s resistance to longitudinal and circumferential cracking, as well as its internal and surface faults, based on the stress and deformation characteristics of the specimen during the flattening procedure.

- CVN Impact Test for PSL-2

CVN is required for several PSL2 pipe diameters and grades. The body will be inspected for seamless pipe. The welded pipe must be examined in three areas: the body, the pipe weld, and the heat-affected zone. The chart of sizes and grades, as well as the required absorbed energy values, may be found in the full API 5L specification.

- DWT Test for PSL-2 Welded Pipe

The average shear fracture area for each test (of a set of two test pieces) shall be 85 percent, based on a test temperature of 0°C (32°F) or if accepted, a lower test temperature. For wall thicknesses greater than 25.4mm (1.000 in. ), DWT test acceptance standards must be agreed upon.

NOTE1: At or above the test temperature, such shear-fracture area assures a suitably ductile fracture.

NOTE2: In gas pipelines, an appropriate combination of shear-fracture area and CVN absorbed energy is an essential pipe-body feature for avoiding brittle fracture propagation and controlling ductile fracture propagation (see Annex G and Table20).

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