Application: API 5L GR.B Seamless Line Pipe is used for conveying gas, water, and petroleum of both the oil and natural gas industries.
Manufacturing Process: API 5L GR.B seamless line pipe are made either by cold-drawn or hot rolled, as required by the customers.
Application: API 5L Gr.B PSL1&PSL2 ERW Carbon Steel Pipe is used for conveying gas, water, and petroleum of both the oil and natural gas industries. Besides, people used it for structure purpose and engineering purpose. We can also do hot-dipped galvanizing and widen the use of such pipes.
Manufacturing Process: API 5L Gr.B PSL1&PSL2 ERW Carbon Steel Pipe is made of hot rolled steel coils. It is made under normal atmospheric temperature by cold forming of the coils into a round cylinder shape. It is formed by rolling the plate and welding the seam.
| Manufacture | Seamless process ,cold drawn or hot rolled / Electric Resistance Welding |
| Cold drawn | O.D.: 15.0～100mm W.T.: 2～10mm |
| Hot rolled | O.D.: 25~700mm W.T.: 3~50mm |
| Size(API 5L Gr.B PSL1&PSL2 ERW) | O.D.: 21.3～660mm W.T.: 2～25mm |
| Length | 6M or specified length as required. |
| Ends | Plain End, Beveled End, Threaded |
|
Grade and Chemical Composition (％) For API 5L PSL1 |
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|
Standard |
Grade |
Chemical composition(%) |
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|
C |
Mn |
P |
S |
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| API 5L |
B |
≤0.28 |
≤1.20 |
≤0.030 |
≤0.030 |
|
B |
≤0.26 |
≤1.20 |
≤0.030 |
≤0.030 |
|
|
Grade and Chemical Composition (％) For API 5L PSL2 |
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|
Standard |
Grade |
Chemical composition(%) |
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|
C |
Mn |
P |
S |
||
| API 5L |
B |
≤0.24 |
≤1.20 |
≤0.025 |
≤0.015 |
|
B |
≤0.22 |
≤1.20 |
≤0.025 |
≤0.015 |
|
|
Mechanical Properties of API 5L GR.B Seamless Line Pipe (PSL1) |
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|
Yield Strength(MPa) |
Tensile Strength(MPa) |
Elongation A% |
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|
psi |
MPa |
psi |
MPa |
Elongation (Min ) |
|
35,000 |
241 |
60,000 |
414 |
21~27 |
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Mechanical Properties of API 5L GR.B Seamless Line Pipe (PSL2) |
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|
Yield Strength(MPa) |
Tensile Strength(MPa) |
Elongation A% |
Impact (J) |
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|
psi |
MPa |
psi |
MPa |
Elongation (Min ) |
Min |
|
241 |
448 |
414 |
758 |
21~27 |
41(27) |
|
35,000 |
241 |
65,000 |
448 |
21~27 |
41(27) |
|
Size |
Tolerance (with respect to specified outside diameter) |
|
<2 3/8 |
+ 0.016 in., - 0.031 in. (+ 0.41 mm, - 0.79 mm) |
|
> 2 3/8 and ≤4 1/2, continuous welded |
±1.00% |
|
> 2 3/8 and < 20 |
±0.75% |
|
> 20. seamless |
± 1.00% |
|
>20 and <36, welded |
+ 0.75%.-0.25% |
|
> 36, welded |
+ 1/4 in.. - 1/8 in. (+ 6.35 mm, -3.20 mm) |
In the case of pipe hydro-statically tested to pressures in excess of standard test pressures, other tolerances may be agreed upon between the manufacturer and the purchaser.
| Size | Minus Tolerance | Plus Tolerance | End-to-End Tolerance | Out-of-Roundness | |
| Diameter,Axis Tolerance (Percent of Specified OD) | Maximum Differential Between Minimum and Maximum Diameters (Applies Only to Pipe With D/t≤75) | ||||
| ≤10 3/4 l&V4 | 1/64(0.40mm) | 1/16(1.59mm) mm) | — | — | |
| >10 3/4 and ≤20 | 1/32 (0.79 mm) | 3/32 (2.38 mm) | — | — | — |
| > 20 and≤ 42 | 1/32 (0.79 mm) | 3/32(2.38 mm) | b | ± 1% | <0.500 in. (12,7 mm) |
| >42 | 1/32 (0.79 mm) | 3/32 (2.38 mm) | b | ± 1% | £ Q625 in. (15.9 mm) |
Out-of-roundness tolerances apply to maximum and minimum diameters as measured with a bar gauge, caliper, or device measuring actual maximum and minimum diameters.
The average diameter (as measured with a diameter tape) of one end of pipe shall not differ by more than 3/32 in. (2.38 mm) from that of the other end.
|
Size |
Type of Pipe |
Tolerance1 (Percent of Specified Wall Thickness} |
|
|
Grade B or Lower |
Grade X42 or Higher |
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|
<2 7/8 |
All |
+20.- 12.5 |
+ 15.0.-12.5 |
|
>2 7/8and<20 |
All |
+ 15,0,-12.5 |
+ 15-I2.5 |
|
>20 |
Welded |
+ 17.5.-12.5 |
+ 19.5.-8.0 |
|
>20 |
Seamless |
+ 15.0.-12.5 |
+ 17.5.-10,0 |
Where negative tolerances smaller than those listed are specified by the purchaser, the positive tolerance shall be increased to the applicable total tolerance range in percent less the wall thickness negative tolerance.
|
Quantity |
Tolerance (percent) |
| Single lengths, special plain-end pipe or A25 pipe |
+ 10.-5.0 |
| Single lengths, other pipe |
+ 10,- 35 |
| Carloads.GradeA25,40,000lb(18 144kg)or more |
-2.5 |
| Carloads, other than Grade A25,40.0001b (18 144 kg) or more |
-1.75 |
| Carloads, all grades less than 40000 lb (18 144 kg) |
-15 |
| Order items. Grade A25. 40.000 lb (18 144 kg) or more |
-3.5 |
| Order items, other than Grade A25,40,000 lb (18 144 kg) or more |
-1.75 |
| Order items, all grades, less than 40.000 lb (18 144 kg) |
-3.5 |
Notes:
1. Weight tolerances apply to the calculated weights for threaded-and-coupled pipe and to the tabulated or calculated weights for plain-end pipe. Where negative wall thickness tolerances smaller than those listed in above table are specified by the purchaser, the plus weight tolerance for single lengths shall be increased to 22.5 percent less the wail thickness negative tolerance.
2. For carloads composed of pipe from more than one order item, the carload tolerances are to be applied on an individual order item basis.
3. The tolerance for order items apply to the overall quantity of pipe shipped for the order item.
Pipe body NDT—Pipes shall be full-body ultrasonically tested for defection of longitudinal imperfection, laminar imperfection inspection and thickness measurement.
Pipe end NDT—Manual UT on the blind zone at both ends of each pipe shall be inspected.
Tension test Test—According to ISO 6892 or ASTM A370.
Impact test: according to API SPEC 5L.
Hydro-static Test—Each tube shall be subjected to the hydro-static pressure test.
Tensile testing of the pipe body—The tensile test should be carried out in accordance with ISO6892 or ASTM A370.Longitudinal samples should be used.Twice per test unit of pipe with the same cold-expansion ratio a.b.d.
Flattening Test—One flattening test shall be made on specimens from each end of two tubes selected from each lot.
Bending Test— a sufficient length of pipe shall stand being bent cold through 90° around a cylindrical mandrel.
Nondestructive electric test-as an alternative to the hydro-static test ,the full body of each pipe shall be tested with a nondestructive electric test . where nondestructive electric test is performed,the lengths shall be marked with the letters”NDE”
100% X-ray test for the weld seam.
The ultrasonic testing.
The eddy current examination.
A sufficient number of visual surface imperfections to provide seasonable assurance is necessarily. The defect shall be removed or cut off within the limits of requirements on length . The finished pipe shall be reasonably straight.
A. Manufacturer’s name or mark.
B. Specification number(year-date or required).
C. Size( OD, W.T, length).
D. Grade( A or B).
E. Type of pipe( F, E, or S).
F. Test pressure( seamless steel pipe only).
G. Heat Number.
H. Any additional information specified in the purchase order.
● Bare pipe or Black / Varnish coating ( according to customer's requirements);
● 6"and below in bundles with two cotton slings;
● Both ends with end protectors;
● Plain end, bevel end(2"and above with bevel ends, degree: 30~35°), threaded and coupling;
● Marking.
