API 5L Grade B Line Pipe – The Reliable Standard for Global Pipelines
245 MPa Minimum Yield Strength | Cost-Effective Solution
Gnee Steel, a leading API 5L line pipe manufacturer since 2008. We produce seamless, ERW, LSAW, and SSAW pipes with 100% MTC certification. Exporting to 50+ countries worldwide.
4 Main Types of API 5L Grade B Pipe
Choose the right manufacturing process for your project requirements. Each type offers unique advantages for specific applications.
API 5L Grade B Seamless Pipe
Made by heating a solid steel billet and piercing it. No weld seam provides uniform strength throughout.
API 5L Grade B ERW Pipe
Flat steel coil rolled into tube, joined by electric resistance welding. Excellent dimensional accuracy.
API 5L Grade B LSAW Pipe
Heavy steel plates bent and joined with longitudinal submerged arc welding. For large diameters.
API 5L Grade B SSAW Pipe
Steel strip formed in spiral shape and welded. Cost-effective solution for large diameter pipes.
Comprehensive Size Range
From 0.405″ to 84″ (10.3 mm – 2134 mm), we cover every pipeline requirement.
| Pipe Type | Seamless (SMLS) | LSAW | SSAW | ERW |
|---|---|---|---|---|
| Size | 13.7 – 1200 mm (0.54″ – 47″) | 355.6 – 1500 mm (14″ – 59″) | 219.1 – 3500 mm (8.6″ – 138″) | 21.3 – 660 mm (0.84″ – 26″) |
| Wall Thickness | STD, XS~SCH100, etc. | STD, XS~SCH100, etc. | STD, XS~SCH100, etc. | STD, XS~SCH100, etc. |
Custom Sizes: We can produce non-standard sizes and wall thicknesses according to your project specifications.
PSL1 vs PSL2: Choose Your Quality Level
Product Specification Level determines chemical composition limits, testing requirements, and mechanical properties.
PSL1
Standard Quality
- Normal projects, most common choice
- Budget-friendly pricing
- Standard chemical composition limits
- Basic mechanical testing
Chemical Composition (PSL1) %
| Grade | C Max | Mn Max | P Max | S Max |
|---|---|---|---|---|
| B Seamless | 0.28 | 1.2 | 0.030 | 0.030 |
| B Welded | 0.26 | 1.2 | 0.030 | 0.030 |
PSL2
High Quality
- Stricter chemical composition limits
- Charpy Impact Testing required
- Enhanced toughness for cold climates
- Complete traceability per pipe
Chemical Composition (PSL2) %
| Grade | C | Si | Mn | P | S | CE |
|---|---|---|---|---|---|---|
| BR/BN | 0.24 | 0.40 | 1.2 | 0.025 | 0.015 | 0.43 |
| BQ | 0.18 | 0.45 | 1.4 | 0.025 | 0.015 | 0.43 |
| BM | 0.22 | 0.45 | 1.2 | 0.025 | 0.015 | 0.43 |
Note: BQ includes V 0.05, Nb 0.05, Ti 0.04; BM welded only
Delivery Condition Specification
Heat treatment and delivery condition determine mechanical properties.
| PSL | Delivery Condition | Grade |
|---|---|---|
| PSL1 | As-rolled, normalizing rolled, thermomechanical rolled, thermomechanical formed, normalizing formed, normalized, normalized and tempered; or, if agreed, quenched and tempered for SMLS pipe only | L245 or B |
| PSL2 | As-rolled | L245R or BR |
| Normalizing rolled, normalizing formed, normalized, or normalized and tempered | L245N or BN | |
| Quenched and tempered | L245Q or BQ | |
| Thermomechanical rolled or thermomechanical formed | 1245M or BM |
Global Standard Equivalents
API 5L Grade B (L245) is recognized internationally under multiple standards. Cross-reference your specification.
ASTM
ASTM A53 Grade B
ISO
ISO 3183 Grade B
GB/T
GB/T 9711 Grade B
CSA
CSA Z245.1 Grade 241
Common Applications
API 5L Grade B line pipe serves diverse industries worldwide. The 245 MPa yield strength provides reliable performance across demanding environments.
Oil & Gas Industry
- Long-distance transmission pipelines
- Field gathering systems
- Water injection lines
- Distribution networks
- Refinery process piping
Water Infrastructure
- Industrial water lines
- Raw water transmission
- Potable water distribution
- Wastewater transport
- Irrigation systems
Industrial & Utility
- Process fluid transport
- General service piping
- Structural piling
- Casing and tubing
- Mechanical applications
Successful API 5L GR B Line Pipe Cases
Real project solutions delivered by Gnee Steel to global clients.
One-Stop Processing Services
From raw pipe to ready-to-install components. Professional in-house processing for your complete pipeline solutions.
Custom Cutting & Beveling
Cut to exact length (e.g., 5.8m for 20ft container). V-shape beveling for easier on-site welding.
Surface Coating
Black Paint/Varnish (economical), 3LPE (underground protection), Galvanizing (moisture resistance).
Threading & Coupling
Add threads to pipe ends. Screw together using couplings – no welding needed for faster installation.
Bending & Punching
Bend into specific angles for directional changes. Punch holes for structural support and connections.
Quality Testing & Quality Control
Quality is the life of our factory. Every pipe undergoes rigorous testing to meet international standards.
PSL1 Testing Requirements
Standard Quality – Mandatory Tests
Chemical Analysis
Verify composition meets API 5L requirements
Tensile Test
Verify yield strength and tensile strength
Hydrostatic Test
Every pipe must pass – leak-proof verification
NDT (100% Weld)
Ultrasonic or radiographic testing on all welds
Visual Inspection
Surface quality and dimensional verification
PSL2 Additional Requirements
High Quality – Enhanced Testing
Charpy V-Notch Impact Test
Cold weather brittleness resistance verification
Enhanced NDT
X-ray and ultrasonic for tiny defects detection
DWT – Drop Weight Test
Crack propagation resistance testing
Complete Traceability
Unique identification code per pipe for full traceability
100% MTC (Mill Test Certificate) Provided
Other API 5L Grades Available
One-stop procurement service for API 5L Line Pipe
Why Choose Gnee Steel
Quality, Price, and Honesty – Your reliable API 5L pipe manufacturer since 2008
Fast Quotes
Response within 2 hours during business hours. Professional sales team ready to assist your project.
Testing & MTC
100% NDT and Hydrostatic tests for every order. Complete Mill Test Certificates provided.
Countries Served
Exporting to Indonesia, Brazil, Middle East, Russia, Southeast Asia and more. Global logistics support.
Frequently Asked Questions
Common questions about API 5L Grade B line pipe
Answer: Yes, API 5L Grade B is an excellent choice for water transport. It is stronger and lasts longer than standard water pipes. The 245 MPa minimum yield strength provides superior durability for municipal water systems, industrial water lines, and raw water transmission projects.
Answer: They are similar but different standards. API 5L Grade B is designed specifically for pipeline applications, while ASTM A106 Grade B is intended for high-temperature pressure service. API 5L includes specific requirements for line pipe manufacturing, testing, and marking. For pipeline projects, API 5L is the standard specification.
Answer: Seamless pipe is more expensive due to higher energy consumption in manufacturing, more expensive raw materials (solid steel billets vs. steel coils), and more complex production processes. However, seamless pipe offers higher safety for critical applications because there is no weld seam that could potentially fail under extreme pressure.
Answer: Standard lengths are 6 meters (20ft) or 12 meters (40ft). We also offer Single Random Length (SRL, 4.8-6.7m) and Double Random Length (DRL, 10-12.7m) options. Custom lengths can be cut according to your project requirements.
Answer: Yes, we provide multiple coating options: Black Paint or Varnish (most economical), 3LPE (3-Layer Polyethylene) coating for underground protection, and Hot-Dip Galvanizing for moisture resistance. We can also provide internal epoxy coating for water applications.
Answer: Yes, we cooperate with major third-party inspection agencies including SGS, Bureau Veritas (BV), Lloyd’s Register (LR), and others. Approximately 40% of our international clients request third-party inspection. Additional inspection fees apply and are quoted based on order quantity and inspection scope.
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Contact us now for competitive pricing and professional technical support
