Stainless Steel Elbow,stainless steel pipe,Forged pipe,stainless steel elbow fitting Jiangyin Senoy Trade Co.,LTD , https://www.senoyflange.comAPI 5L X52 Specifications and Application Scope
API 5L X52 is a high-strength steel grade within the API 5L standard, defining the production of two distinct product quality levels (PSL1 and PSL2) for line pipes. These pipes are available in both seamless and welded forms and are extensively used across the globe for transporting oil and natural gas. At CSC, we offer an array of grades for similar applications, including X42, X46, X52, X56, X60, X65, and X70 line pipes.
### Manufacturing Process
The raw materials for producing these pipes—such as steel ingots, billets, slabs, coils, or plates—are manufactured using advanced processes like alkaline oxygen, electric furnace, or open-hearth methods, often combined with a ladle refining process. For PSL2 products, the steel must be fully killed and refined following fine-grained practices. Additionally, coils or sheets used for PSL2 pipes must be free from any repair welds.
When it comes to welding API 5L X52 line pipes, there are three primary welding techniques: ERW (Electric Resistance Welding), LSAW (Longitudinal Submerged Arc Welding), and SSAW (Spiral Submerged Arc Welding). Each method has its own advantages and is chosen based on specific project requirements.
### Delivery Conditions
Delivery conditions vary depending on whether the pipe meets PSL1 or PSL2 standards. For PSL1, delivery conditions can include as-rolled, normalized, or thermomechanically processed options. For PSL2, more stringent conditions such as normalizing, quenching and tempering, or thermomechanical rolling are required. The suffixes R, N, Q, or M attached to the steel grade indicate the specific treatment undergone by the pipe.
| PSL | Delivery Condition | Pipe Grade |
|-----|--------------------------|---------------|
| PSL1| As-rolled, normalized | A |
| | As-rolled, thermomechanical | B |
| | Various treatments | X42, X46, etc.|
| PSL2| As-rolled | BR, X42R |
| | Normalizing, etc. | BN, X42N, etc.|
| | Quenching and tempering | BQ, X42Q, etc.|
| | Thermomechanical rolling| BM, X42M, etc.|
### Chemical Composition for PSL1 Pipe (t ≤ 0.984")
| Steel Grade | Carbon (C) Max | Manganese (Mn) Max | Phosphorus (P) Max | Sulfur (S) Max | Vanadium (V) Max | Niobium (Nb) Max | Titanium (Ti) Max |
|-------------|----------------|--------------------|--------------------|----------------|------------------|------------------|-------------------|
| X52 | 0.28 | 1.4 | 0.3 | 0.3 | d | d | d |
### Chemical Composition for PSL2 Pipe (t ≤ 0.984")
| Steel Grade | Carbon (C) Max | Silicon (Si) Max | Manganese (Mn) Max | Phosphorus (P) Max | Sulfur (S) Max | Vanadium (V) Max | Niobium (Nb) Max | Titanium (Ti) Max | Other Elements Max | CE IIW Max | CE Pcm Max |
|-------------|----------------|------------------|--------------------|--------------------|----------------|------------------|------------------|-------------------|--------------------|-------------|------------|
| X52N | 0.24 | 0.45 | 1.4 | 0.025 | 0.015 | 0.1 | 0.05 | 0.04 | d, e, l | 0.043 | 0.25 |
| X52Q | 0.18 | 0.45 | 1.5 | 0.025 | 0.015 | 0.05 | 0.05 | 0.04 | e, l | 0.043 | 0.25 |
| X52M | 0.22 | 0.45 | 1.4 | 0.025 | 0.015 | d | d | d | e, l | 0.043 | 0.25 |
### Mechanical Properties
| Pipe Grade | Yield Strength (Rt0,5 PSI Min) | Tensile Strength (Rm PSI Min) | Elongation (%) Min | Tensile Strength (Weld Seam) (Rm PSI Min) |
|------------|--------------------------------|-------------------------------|--------------------|------------------------------------------|
| X52 | 52,200 | 66,700 | c | 66,700 |
### Testing Requirements
#### Hydrostatic Test
Pipes must withstand a hydrostatic test without any leakage occurring at the weld seam or the pipe body. Jointers do not require hydrostatic testing if the individual pipe sections have already passed such tests.
#### Bend Test
No cracks should appear in any part of the test sample, and the weld should not open during the bend test.
#### Flattening Test
For EW pipes with D < 12.750 inches, X60 pipes with a wall thickness of 500 inches must not show weld opening until the distance between the plates is less than 66% of the original outer diameter. For all other grades and wall thicknesses, this threshold is reduced to 50%. For pipes with D/t > 10, the limit is further reduced to 30%.
This comprehensive approach ensures that API 5L X52 pipes meet rigorous standards, providing reliability and safety in critical pipeline applications.