API 5L Gr B Seamless Pipe
API 5L specification is for welded and seamless Steel pipe for pipeline transportation systems Petroleum and natural gas industries. Although in recent years more and more projects designer will adopt ERW welded pipe or spiral welded pipes as line pipe instead seamless steel pipe, API 5L GR B seamless steel pipe is still in large demand in worldwide engineering industry. Let’s see the API 5L requirements for API 5L Grade B seamless steel pipes.
1. API 5L Gr B Seamless Steel Pipe PSL1 Chemical Composition
| Steel grade | Mass fraction, based upon heat and product analyses a | |||||||
| % | ||||||||
| C | Mn | P | S | V | Nb | TI | ||
| max. b | max. b | min. | max. | max. | max. | max. | max. | |
| Seamless pipe | ||||||||
| L245 or B | 0,28 | 1,20 | – | 0,030 | 0,030 | c,d | c,d | d |
2. API 5L GR B Seamless PSL1 Carbon Pipe Mechanical Properties
| Pipe grade | Pipe body of seamless and welded pipes | Weld seam of EW, SAW and COW pipes | ||
| Yield strength a Rt0,5 MPa (psi) minimum | Tensile strength a Rm MPa (psi) minimum | Elongation Af % minimum | Tensile strength b Rm MPa (psi) minimum | |
| L245R or BR L245 or B | 245 (35 500) | 415 (60 200) | c | 415 (60 200) |
3. API 5L Gr B Seamless Steel Pipe PSL2 Chemical Composition
| Steel grade (Steel name) | Mass fraction, based upon heat and product analyses % maximum | Carbon equivalent a % maximum | |||||||||
| C b | Si | Mn | P | S | V | Nb | Ti | Other | CEIIW | CEPcm | |
| Seamless steel pipe | |||||||||||
| L245R or BR | 0,24 | 0,40 | 1,20 | 0,025 | 0,015 | c | c | 0,04 | e | 0,43 | 0,25 |
4. API 5L Grade B PSL2 SMLS Steel Pipe Tensile Strength Properties
| Pipe grade | Pipe body of seamless and welded pipes | ||||||
Yield strength a Rt0,5 b | Tensile strength a Rm | Ratio a, b, c | Elongation Af | ||||
| MPa (psi) | MPa (psi) | Rt0,5/Rm | % | ||||
| minimum | maximum | minimum | maximum | maximum | minimum | ||
| L245R or BR L245N or BN L245Q or BQ L245M or BM | 245 (35 500) | 450 e (65 300) e | 415 (60 200) | 760 (110 200) | 0,93 | f | |
5. API 5L GRADE B Thickness tolerance for both PSL1 & PSL2 seamless pipe
| Wall thickness t mm (in) | Tolerances a mm (in) |
| SMLS pipe b | |
| ≤4,0 (0.157) | +0,6 (0.024) -0,5 (0.020) |
| ＞4,0 (0.157) to ＜25,0 (0.984) | +0,150 t -0,125 t |
| ≥25,0 (0.984) | +3,7 (0.146) or 0,1 t, whichever is the greater -3,0 (0.120) or . 0,1 t, whichever is the greater |
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