API 5L Grade B
API 5L Grade B line pipes are API standard certified. TUSPIPE strictly controls quality at every stage of pipe production to ensure strength and toughness meet standards. This allows customers to achieve more stable pipeline performance and longer service life in oil and gas transportation projects.
API 5L Grade B
The American Petroleum Institute API 5L specification is for line pipes used in pipelines for transporting oil, natural gas, and water. The carbon steel pipes that are covered by this specification can be either seamless or welded. The API 5L Grade B pipe includes PSL1 and PSL2 line pipes, and they are classified according to the different end uses and service requirements, such as the transmission of oil, natural gas, or water. The strength of the carbon steel pipes is measured in psi or MPa. The minimum yield strength of Grade B carbon steel pipes is 205MPa, while the minimum tensile strength is 415MPa. Line pipes are also available in higher strengths, such as X42, X46, X52, X56, X60, X65, X70, and X80. These higher strength grades can be used for the transmission of oil and gas in high-pressure and high-temperature environments.
タスパイプを選ぶ理由
1998年以来、天津聯合鋼管有限公司(TUSPIPE)は高品質のラインパイプの供給に尽力しています。
年間生産能力は50万トンを超え、石油・ガス開発、送電、船舶・自動車建造、水・電気、環境保護、機械工学、インフラ建設など、さまざまな分野・業界にサービスを提供している。
TUSPIPEは製品の品質を重視し、厳格な品質管理を行っている。製品の品質を維持するため、2004年から試験検査センターを設立しました。最新の試験・検査設備を備え、引張試験、水力試験、衝撃試験、DWTTなどを実施することができます。
API 5L gRADE B Pipe Chemical Composition
- Chemical Composition for API 5L Grade B PSL 1 pipe with t ≤ 0.984”
| 鋼種 | Mass fraction, % based on heat and product analyses a, c | ||||||
|---|---|---|---|---|---|---|---|
| C | ムン | P | S | V | Nb | ティ | |
| max b | max b | マックス | マックス | マックス | マックス | マックス | |
| 溶接パイプ | |||||||
| Grade B B | 0.26 | 1.2 | 0.3 | 0.3 | c, d | c, d | d |
| V + Nb：≤0.06, Unless otherwise agreed. | |||||||
| V + Nb + Ti: ≤0.15 | |||||||
| For each 0.01% reduction of C; Mn content can be increased by 0.05% to a maximum of 1.65% | |||||||
a.Cu ≤ 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; および Mo ≤ 0.15%、
b.b. 指定された炭素の最大濃度を0.01% 下回るごとに、指定された Mn の最大濃度を0.05% 上回ることが許容され、等級≥ L245 または B、≤ L360 または X52の場合は最大1.65%、等級 > L360 または X52、 < L485 または X70の場合は最大1.75%、等級 L485 または X70の場合は最大2.00% まで許容される、
c.別段の合意がない限り、NB＋V≦0.06%、
d.Nb + V + TI ≤ 0.15%、
e.別段の合意がない限り
f.別段の合意がない限り、NB＋V＝Ti≦0.15%、
g.Bの意図的な添加は許されず、残留B≦0.001%である。
- Chemical Composition for API 5L Grade B PSL 2 Pipe with t ≤ 0.984”
| 鋼種 | 熱分析および製品分析に基づく質量分率、% | 炭素換算 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Si | ムン | P | S | V | Nb | ティ | その他 | CE IIW | CE Pcm | |
| max b | マックス | max b | マックス | マックス | マックス | マックス | マックス | マックス | マックス | ||
| 溶接パイプ | |||||||||||
| 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.別段の合意がない限り、Nb = V ≤ 0.06%、
d.Nb = V = Ti ≤ 0.15%、
e.別段の合意がない限り、Cu≦0.50%；Ni≦0.30% Cr≦0.30%、Mo≦0.15%、
f.別段の合意がない限り、
g.別段の合意がない限り、Nb + V + Ti ≤ 0.15%、
h.特に断りのない限り、Cu≦0.50% Ni≦0.50% Cr≦0.50%、MO≦0.50%、
i.別段の合意がない限り、Cu≦0.50% Ni≦1.00% Cr≦0.50%、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.脚注j が付された等級を除くすべてのPSL 2鋼管には、以下が適用される。別段の合意がない限り、意図的なBの添加は認められず、残留B≦0.001%。
API 5L Grade b Pipe Mechanical Properties
- Mechanical Properties for API 5L Grade B PSL-1 & PSL-2 Pipe
| パイプグレード | Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 2 | Seam of Welded Pipe | |||||
|---|---|---|---|---|---|---|---|
| Yield Strength a | Tensile Strength a | Ratio a, c | 伸び | Tensile Strength d | |||
| Rt0,5 PSI Min | Rm PSI Min | R10,5IRm | (in 2in) | Rm (psi) | |||
| Af % | |||||||
| Minimum | Maximum | Minimum | Maximum | Maximum | Minimum | Minimum | |
| BR, BN, BQ, BM | 35,500 | 65,300 | 60,200 | 95,000 | 0.93 | f | 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) |
Dimensions and Sizes of API 5L Grade B Line Pipe
When purchasing an API 5L Grade B line pipe, it is essential to check the size and dimensions of the pipe to ensure that it meets the required standards. The dimensions and masses of API 5L line pipes are specified in ISO 4200 and ASME B36.10M. These standards provide a guide for different size pipes and specify the wall thickness of each size. To check if a pipe meets the required standards, refer to these tables. Doing so will help to ensure that the pipe is the right size and has the correct wall thickness. By taking these precautions, buyers can be sure that they are getting a quality product that meets all the requirements.
| NPS | O.D. | 公称肉厚 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 識別名 | インチ | mm | SCH5S | SCH10S | SCH10 | SCH20 | SCH30 | SCH40 | SCH60 | SCH80 | SCH100 | SCH120 | SCH140 | SCH160 | ス | 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 Pipe Tolerance
| O.D. Tolerance | W.T. Tolerance | ||||
|---|---|---|---|---|---|
| A, B | X42 ~ X70 | ||||
| D ＜ 60.3mm | +0.41/-0.40mm | D ＜ 73mm | +20%/-12.5% | D ＜ 73mm | +15%/-12.5% |
| D ≥ 60.3m | +0.75/-0.40mm | D ≥ 73mm | +15%/-12.5% | D ≥ 73mm | +15%/-12.5% |
Delivery Condition for API 5L Grade B Line Pipe
| PSL | Delivery Condition | パイプグレード |
|---|---|---|
| PSL 1 | As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered or if agreed Q&T SMLS only | B |
| PSL 2 | As-rolled | BR, X42R |
Test and inspection of API 5L Grade B Line pipes
- 静水圧試験
Hydrostatic testing is a way of testing pipes for leaks by filling them with water and pressurizing them. Hydrostatic tests are usually performed on newly manufactured pipes, or after repair work has been carried out on existing pipes. The test involves filling the pipe with water and then pressurizing it to a specified level. The pressure is then held for a while while the pipe is monitored for leaks. If any leaks are detected, the weld seam or pipe body may need to be repaired or replaced. Hydrostatic testing is an important part of the manufacturing process for steel pipes, as it helps to ensure that the finished product is safe and fit for its purpose.
- 曲げ試験
The bending test is a necessary part of the production process for the API 5L line pipe. This test ensures that the steel pipe being produced is of the highest quality and crack-free. To perform the test, a sample of the pipe is placed in a bending machine. The machine then applies pressure to the sample until it reaches the point of fracture. The amount of pressure required to break the pipe is recorded and compared to industry standards. If the pipe meets or exceeds the standards, it is considered suitable for use in API 5L line pipe production. However, if the pipe breaks at a lower pressure than expected, there are likely cracks present in the weld seam. In this case, the pipe will be rejected and recycled.
- 平坦化テスト
The flattening test during API 5L line pipe production is a way of crack detection. A sample of the steel pipe is flattened between two plates and then examined for cracks. The test is conducted on welds, as well as on the body of the pipe. Deformation during the flattening process is monitored in both longitudinal and circumferential directions. The test is considered to pass/fail based on the number and size of cracks that are observed.
- CVN衝撃テスト
During the impact test for API 5L line pipe production, steel samples are taken from three positions: the pipe body, the welding seam, and the heat-affected zone. The impact test is performed at each position. The results of the impact tests are used to assess the suitability of the steel for use in pipeline construction. The impact tests help to ensure that the steel will be able to withstand the forces that will be applied to it during operation. In addition, the tests can also provide information about the weldability of the steel and its resistance to crack propagation. As a result, the impact test is an essential part of the quality control process for API 5L line pipe production.
- DWT Test for PSL-2 Welded Pipe
The DWTT test is an essential quality control measure during the production of large diameter steel pipes. Also known as the drop-weight tear test, this method is used to evaluate a pipe’s resistance to fracture under impact loading. The test is specified in the industry-standard API 5L specification for steel line pipe. In a DWTT test, a weight is dropped onto the end of a pipe to create an impact load. The resulting fracture is then inspected to determine the energy required to propagate the crack. This information can be used to evaluate the toughness of the pipe material and identify any manufacturing defects. The DWTT test is just one of many quality control measures used during pipe production, but it is an important one that helps to ensure the safety and reliability of steel line pipes.
