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Xi'an Dongmeng Group Co., Ltd. is one of the most reliable manufacturers and suppliers of API 5L Grade B PSL1 Pipe Manufacturer & Supplier | Seamless & ERW Line Pipe for Oil & Gas Applications in China, also supports customized service. With abundant experience, we warmly welcome you to wholesale cheap products in stock here and get free sample from our factory. For price consultation, contact us.

API 5L seamless & welded pipe

API 5L pipe in grades B, X42, X52, X60, X65 & X70.ANSI / API 5L specifies the manufacture of two product levels (PSL1 and PSL2) of seamless and welded steel pipe for the use of a pipeline in the transportation of petroleum and natural gas.

API 5L Grade B PSL1 carbon steel pipe manufacturer and exporter. Supply seamless and ERW API 5L Grade B PSL1 line pipes with full MTC, third-party inspection, custom sizes, anti-corrosion coating, and global delivery for oil & gas, pipeline, petrochemical, and energy projects.

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API 5L Grade B PSL1 Pipe Manufacturer & Supplier

API 5L Grade B PSL1 Carbon Steel Pipe Overview

API 5L Grade B PSL1 Pipe is one of the most widely used carbon steel line pipes in the global energy and infrastructure industries. Designed according to API 5L specifications issued by the American Petroleum Institute, Grade B PSL1 pipe offers an excellent balance of strength, weldability, pressure resistance, and cost efficiency.

As a preferred material for crude oil transmission, natural gas transportation, water pipelines, refinery systems, and industrial piping networks, API 5L Grade B PSL1 steel pipe is available in seamless, ERW, LSAW, and SSAW manufacturing forms.

At Xi'an Dongmeng Group Co., Ltd, we manufacture and export API 5L Grade B PSL1 pipes with full traceability, EN 10204 3.1 certification, hydrostatic testing, NDT inspection, and project-specific coating solutions to meet international EPC, pipeline, and infrastructure project requirements.

Delivery condition

PSL	Delivery Condition	Pipe grade
PSL1	As-rolled, normalized, normalizing formed	A
	As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered or if agreed Q&T SMLS only	B
	As-rolled, normalizing rolled, thermomechanical rolled, thermo-mechanical formed, normalizing formed, normalized, normalized and tempered	X42, X46, X52, X56, X60, X65, X70
PSL 2	As-rolled	BR, X42R
	Normalizing rolled, normalizing formed, normalized or normalized and tempered	BN, X42N, X46N, X52N, X56N, X60N
	Quenched and tempered	BQ, X42Q, X46Q, X56Q, X60Q, X65Q, X70Q, X80Q, X90Q, X100Q
	Thermomechanical rolled or thermomechanical formed	BM, X42M, X46M, X56M, X60M, X65M, X70M, X80M
	Thermomechanical rolled	X90M, X100M, X120M
	The suffice (R, N, Q or M) for PSL2 grades, belongs to the steel grade

Chemical requirements

Chemical Composition for PSL 1 pipe with t ≤ 0.984"

Steel Grade	Mass fraction, % based on heat and product analyses a,g
	C	Mn	P	S	V	Nb	Ti
	max b	max b	max	max	max	max	max
Seamless Pipe
A	0.22	0.90	0.03	0.03	–	–	–
B	0.28	1.20	0.03	0.03	c,d	c,d	d
X42	0.28	1.30	0.03	0.03	d	d	d
X46	0.28	1.40	0.03	0.03	d	d	d
X52	0.28	1.40	0.03	0.03	d	d	d
X56	0.28	1.40	0.03	0.03	d	d	d
X60	0.28 e	1.40 e	0.03	0.03	f	f	f
X65	0.28 e	1.40 e	0.03	0.03	f	f	f
X70	0.28 e	1.40 e	0.03	0.03	f	f	f
Welded Pipe
A	0.22	0.90	0.03	0.03	–	–	–
B	0.26	1.20	0.03	0.03	c,d	c,d	d
X42	0.26	1.30	0.03	0.03	d	d	d
X46	0.26	1.40	0.03	0.03	d	d	d
X52	0.26	1.40	0.03	0.03	d	d	d
X56	0.26	1.40	0.03	0.03	d	d	d
X60	0.26 e	1.40 e	0.03	0.03	f	f	f
X65	0.26 e	1.45 e	0.03	0.03	f	f	f
X70	0.26e	1.65 e	0.03	0.03	f	f	f
a. Cu ≤ = 0.50% Ni; ≤ 0.50%; Cr ≤ 0.50%; and Mo ≤ 0.15%, b. For each reduction of 0.01% below the specified maximum concentration for carbon, an increase of 0.05% above the specified maximum concentration 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; and up to a maximum of 2.00% for grade L485 or X70., c. Unless otherwise agreed NB + V ≤ 0.06%, d. Nb + V + TI ≤ 0.15%, e. Unless otherwise agreed., f. Unless otherwise agreed, NB + V = Ti ≤ 0.15%, g. No deliberate addition of B is permitted and the residual B ≤ 0.001%

API 5L Welded Pipe

a. SMLS t>0.787", CE limits shall be as agreed. The CEIIW limits applied fi 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. Unless otherwise agreed Nb = V ≤ 0.06%,
d. Nb = V = Ti ≤ 0.15%,
e. Unless otherwise agreed, Cu ≤ 0.50%; Ni ≤ 0.30% Cr ≤ 0.30% and Mo ≤ 0.15%,
f. Unless otherwise agreed,
g. Unless otherwise agreed, Nb + V + Ti ≤ 0.15%,
h. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 0.50% Cr ≤ 0.50% and MO ≤ 0.50%,
i. Unless otherwise agreed, Cu ≤ 0.50% Ni ≤ 1.00% Cr ≤ 0.50% and 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. For all PSL 2 pipe grades except those grades with footnotes j noted, the following applies. Unless otherwise agreed no intentional addition of B is permitted and residual B ≤ 0.001%.

Mechanical properties

Pipe Grade	Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 1			Seam of Welded Pipe
	Yield Strength a	Tensile Strength a	Elongation	Tensile Strength b
	Rt0,5 PSI Min	Rm PSI Min	(in 2in Af % min)	Rm PSI Min
A	30,500	48,600	c	48,600
B	35,500	60,200	c	60,200
X42	42,100	60,200	c	60,200
X46	46,400	63,100	c	63,100
X52	52,200	66,700	c	66,700
X56	56,600	71,100	c	71,100
X60	60,200	75,400	c	75,400
X65	65,300	77,500	c	77,500
X70	70,300	82,700	c	82,700
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 foot note 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)

Pipe Grade	Tensile Properties – Pipe Body of SMLS and Welded Pipes PSL 2						Seam of Welded Pipe
	Yield Strength a		Tensile Strength a		Ratio a,c	Elongation	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
X42,X42R,X2Q,X42M	42,100	71,800	60,200	95,000	0.93	f	60,200
X46N,X46Q,X46M	46,400	76,100	63,100	95,000	0.93	f	63,100
X52N,X52Q,X52M	52,200	76,900	66,700	110,200	0.93	f	66,700
X56N,X56Q,X56M	56,600	79,000	71,100	110,200	0.93	f	71,100
X60N,X60Q,S60M	60,200	81,900	75,400	110,200	0.93	f	75,400
X65Q,X65M	65,300	87,000	77,600	110,200	0.93	f	76,600
X70Q,X65M	70,300	92,100	82,700	110,200	0.93	f	82,700
X80Q,X80M	80,.500	102,300	90,600	119,700	0.93	f	90,600
a. For intermediate grade, refer to the full API5L specification.
b. for grades > X90 refer to the full API5L specification.
c. This limit applies for pies with D> 12.750 in
d. For intermediate grades, the specified minimum tensile strength for the weld seam shall be the same value as was determined for the pipe body using foot a.
e. for pipe requiring longitudinal testing, the maximum yield strength shall be ≤ 71,800 psi
f. 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
g. Lower values fo R10,5IRm may be specified by agreement
h. for grades > x90 refer to the full API5L specification.

Products Application

The API 5L welded line pipe is a fundamental component of modern infrastructure, specifically designed for the transportation of oil, gas, and other fluids. Its applications are vast and critical to the global energy and industrial sectors.

1. Oil and Gas Transmission Pipelines (The Primary Application)

This is the core purpose for which API 5L was developed. These pipelines form the vast, continent-spanning networks that move hydrocarbons from production fields to refineries, distribution centers, and ultimately to consumers.

Gathering Lines: These are smaller-diameter pipes that collect crude oil or natural gas from multiple wellheads in a field and transport it to a central collection or processing facility.

Transmission/Trunk Lines: These are the long-distance, large-diameter "highways" of the energy industry. They transport processed oil or natural gas over hundreds or thousands of miles across countries and continents.

Distribution Lines: The final leg of the network, consisting of smaller-diameter pipes that deliver natural gas to local communities, businesses, and individual homes.

Why API 5L is used: Its standardized strength grades (e.g., X42, X52, X65, X70, X80), strict chemical composition, and rigorous mechanical testing ensure it can handle the high pressures, volatile contents, and environmental stresses encountered over decades of operation.

2. Natural Gas Distribution Networks

A subset of the above, but worth highlighting due to its importance for public utilities. Welded API 5L pipe is used for both high-pressure main lines and medium-pressure distribution lines within cities and towns, ensuring a safe and reliable supply of gas for heating and cooking.

3. Water Transmission and Supply

While often subject to additional coatings for corrosion prevention, large-diameter API 5L pipes are extensively used for:

Raw Water Mains: Transporting water from reservoirs, rivers, or treatment plants.

Potable Water Lines: Serving as the primary arteries for municipal water supply systems due to their strength and reliability for high-pressure applications.

Industrial Water Supply: Delivering large volumes of water to power plants, manufacturing facilities, and agricultural irrigation projects.

4. Carbon Dioxide (CO2) Transportation

This is a growing and critical application, particularly for:

Enhanced Oil Recovery (EOR): CO2 is injected into aging oil fields to increase pressure and force more oil to the surface.

Carbon Capture, Utilization, and Storage (CCUS): Captured CO2 from industrial processes (e.g., power plants, cement factories) is compressed and transported via pipeline to be stored permanently underground in geological formations.

Why API 5L is used: Transporting dense-phase CO2 presents unique challenges (e.g., corrosion in the presence of water). API 5L pipes can be manufactured from specially selected grades and with stringent toughness requirements to ensure safe containment.

5. Slurry Pipelines

These pipelines transport a mixture of solid particles (like coal, iron ore, or copper concentrate) suspended in a liquid (usually water).

Mining Industry: To move mined minerals from remote mining sites to processing plants or ports over long distances. This is often more economical and environmentally friendly than truck or rail transport.

Why API 5L is used: The internal abrasion from solid particles is extreme. API 5L pipes specified for slurry service are often made from higher-strength grades and can be supplied with special abrasion-resistant linings or increased wall thickness to extend service life.

6. Industrial Applications

Within large industrial complexes, API 5L pipe is used for intra-plant piping systems that require high strength and reliability, such as:

Steam Lines: Transporting high-pressure steam for power generation and process heating.

Process Lines: Moving various process fluids, chemicals, and feedstocks between different units within a refinery, chemical plant, or petrochemical facility.

While API 5L welded pipe is the workhorse for long-distance, large-diameter transmission, API 5L seamless line pipe is the specialist, chosen for applications where its unique properties are critical for safety, performance, and reliability.

The key difference lies in the manufacturing process: seamless pipe is formed from a solid billet of steel that is pierced and stretched into a hollow pipe, meaning it has no longitudinal weld seam. This fundamental difference dictates its applications.

Here are the primary applications of API 5L seamless line pipe:

1. High-Pressure, High-Hazard Service

This is the most significant application area for seamless pipe. The absence of a weld seam eliminates the most common potential point of failure (e.g., weld defects, inconsistencies in the heat-affected zone).

Sour Service (H₂S Environments): In oil and gas fields containing hydrogen sulfide, the risk of Sulfide Stress Cracking (SSC) is high. Seamless pipe, with its more homogeneous and controlled microstructure, offers superior resistance to this catastrophic form of cracking compared to welded pipe, where the weld and heat-affected zone can be vulnerable.

Offshore Platforms & Subsea Pipelines: These environments are incredibly demanding, with high external pressures, corrosive seawater, and difficult inspection and repair. Seamless pipe is often specified for critical flow lines, risers (which connect the seabed to the platform), and jumper lines due to its guaranteed integrity and high pressure rating.

Gas Injection & CO₂ Flooding Lines: Used in Enhanced Oil Recovery (EOR), these lines operate at extremely high pressures. The uniformity of wall thickness and strength around the entire circumference of seamless pipe makes it the default choice for such critical, high-pressure services.

2. Small-Diameter Flow Lines and Gathering Lines

While large-diameter transmission pipes are welded, the smaller-diameter pipes that connect individual wellheads to processing facilities are often seamless.

Reason: For smaller diameters (e.g., 2" to 12"), the cost difference between seamless and welded pipe diminishes. Given the often harsh and variable pressures and fluids coming directly from the wellhead (which may be sour, erosive, or high-pressure), operators opt for the added safety and reliability of seamless pipe.

3. Critical Process Piping within Facilities

Inside refineries, petrochemical plants, gas processing plants, and compressor stations, you will find extensive use of seamless API 5L pipe.

Applications: It is used for high-pressure transfer lines, feedstock lines, compressor discharge lines, and fuel gas lines. The compact layout of a plant involves many bends, twists, and connections, requiring pipes with consistent strength in all directions. The reliability of seamless pipe is paramount in these congested plants where a failure would be catastrophic.

4. Applications with Severe Bending or Coiling

Seamless pipe has uniform mechanical properties around its entire circumference.

Directional Drilling (HDD): For Horizontal Directional Drilling installations, the pipe must endure significant bending stresses during pullback. A seamless pipe is less likely to develop issues during this process.

Coiled Tubing: While not API 5L, the principle is the same. Seamless tubing is essential for applications where the pipe is spooled onto a giant reel and uncoiled for downhole operations because it lacks a weld seam that could crack under repeated bending stress.

5. Erosive and Abrasive Services

Although welded pipe can handle abrasion (often with linings), the perfectly smooth and consistent internal surface of seamless pipe provides better resistance to erosion from sand, proppant, or other fine particulates in the flow stream without the risk of erosion starting at a minute weld imperfection.

Key Advantages of Seamless Pipe Driving These Applications:

No Weld Seam: Eliminates the risk of weld defects and provides homogeneous strength around the entire circumference.

Superior Strength Under Pressure: Generally capable of handling higher pressures and more extreme load conditions.

Uniform Wall Thickness: Provides more predictable performance under high stress and is less prone to failure from erosion.

Better Ovality and Dimensional Consistency: Often has a more perfect roundness, which is beneficial for making critical connections in pressure systems.

Summary Table: Welded vs. Seamless API 5L

Feature	API 5L Welded Pipe	API 5L Seamless Pipe
Primary Application	Long-distance, large-diameter transmission	High-pressure, critical, hazardous service
Key Advantage	Cost-effective for large sizes	Superior integrity & pressure rating
Sizes	Very large diameters (e.g., 24" to 48"+)	Generally smaller diameters (up to ~24")
Cost	Lower cost for large diameters	Higher cost due to complex manufacturing
Critical Factor	The quality and integrity of the weld seam	Homogeneity of the steel throughout

In conclusion, API 5L seamless line pipe is the premium choice for the most demanding, high-risk, and high-pressure applications in the energy industry and beyond, where failure is not an option. Its use is dictated by safety cases and engineering specifications that prioritize inherent material reliability over cost.

Machining Performance Analysis

API 5L Grade B PSL1 steel exhibits good machinability for fabrication operations including:

Suitable Processing Methods

CNC Turning

Milling

Drilling

Threading

Beveling

Cutting

Fabrication Benefits

Consistent dimensional stability

Reduced tooling wear

Efficient field installation

Suitable for spool fabrication

Weldability Analysis

One of the primary reasons buyers select API 5L Grade B PSL1 pipe is its excellent weldability.

Applicable Welding Methods

SMAW

GMAW (MIG)

GTAW (TIG)

SAW

FCAW

Welding Advantages

Low carbon content reduces cracking risk

Excellent joint integrity

Suitable for field welding operations

High pipeline construction efficiency

Corrosion Resistance Analysis

While API 5L Grade B is a carbon steel grade rather than a corrosion-resistant alloy, its service life can be significantly enhanced through protective systems.

Available Surface Treatments

Black Coating

Varnish Coating

Hot Dip Galvanizing

FBE Coating

2PE Coating

3PE Coating

Coal Tar Epoxy Coating

Benefits

Extended pipeline lifespan

Reduced maintenance costs

Improved underground performance

Enhanced marine environment resistance

Industry Applications

Oil & Gas Transmission

Crude oil pipelines

Natural gas pipelines

Gathering systems

Distribution networks

Petrochemical Industry

Refinery piping systems

Process piping

Utility pipelines

Water Infrastructure

Municipal water supply

Irrigation systems

Industrial water transport

Power Generation

Cooling water pipelines

Utility piping

Energy infrastructure

Construction & Infrastructure

Structural applications

Piling projects

Utility conduits

Applicable Standards

Main Standard

API 5L PSL1

Related Standards

ASTM A53

ASTM A106

ASTM A333

ASTM A252

ISO 3183

EN 10208

ASME B36.10M

Production Capacity

Manufacturing Processes

Seamless Hot Rolling

ERW Welding

LSAW Production

SSAW Production

Annual Capacity

Carbon Steel Pipe: 500,000+ Tons

Export Experience: 20+ Years

Export Countries: 80+

Monthly Production Capacity: 40,000+ Tons

Inspection & Quality Assurance

At Xi'an Dongmeng Group Co., Ltd, every API 5L Grade B PSL1 pipe undergoes strict quality control procedures.

Raw Material Inspection

Chemical Analysis

Supplier Qualification Verification

Production Inspection

Dimensional Inspection

Online Ultrasonic Testing

Visual Examination

Final Inspection

Hydrostatic Testing

NDT Inspection

Mechanical Testing

Third-Party Inspection (SGS, BV, TUV)

Documentation

Mill Test Certificate (MTC)

EN 10204 3.1

Packing List

Commercial Invoice

Certificate of Origin

Packaging & Shipping

Export Packaging Options

Steel Bundle Packing

Waterproof Wrapping

Wooden Crates

End Caps Protection

Container Loading

Shipping Methods

FCL Container

LCL Shipment

Break Bulk Vessel

Project Cargo Transportation

Export Destinations

USA

Canada

UAE

Saudi Arabia

Australia

Brazil

South Africa

Southeast Asia

Why Choose Us

Experienced Pipeline Steel Manufacturer

20+ years manufacturing experience

Complete Product Range

API 5L Gr.A, Gr.B, X42, X52, X60, X65, X70

Strict Quality Control

100% traceability system

Flexible Customization

Custom dimensions

Custom coating

Custom packaging

Global Project Experience

Oil & Gas Projects

Petrochemical Plants

EPC Contractors

Government Infrastructure Projects

Fast Delivery

Standard sizes in stock

Quick production scheduling

FAQ

What is API 5L Grade B PSL1 pipe used for?

API 5L Grade B PSL1 pipe is mainly used for oil transmission, gas transportation, water pipelines, petrochemical plants, and energy infrastructure projects.

What is the difference between PSL1 and PSL2?

PSL2 has stricter requirements for chemical composition, mechanical properties, testing, and traceability than PSL1.

Is API 5L Grade B available in seamless and ERW types?

Yes. We supply seamless, ERW, LSAW, and SSAW API 5L Grade B pipes.

Can you provide 3PE coated API 5L pipes?

Yes. 3PE, FBE, galvanized, and other anti-corrosion coatings are available.

What certificates can be supplied?

EN 10204 3.1 MTC, SGS, BV, TUV, and third-party inspection reports.

What is the MOQ?

Standard sizes can often be supplied from stock with flexible MOQ requirements.

Can pipes be cut to custom lengths?

Yes. We provide customized lengths and fabrication services.

Which countries do you export to?

We export to more than 80 countries across North America, South America, Europe, the Middle East, Africa, and Asia.

How quickly can production be completed?

Typical production lead time is 7–25 days depending on size and quantity.

Can I request a free quotation?

Yes. Our engineering sales team provides detailed quotations within 24 hours.

Contact Us

Xi'an Dongmeng Group Co., Ltd

Carbon Steel Pipe Manufacturer & Global Exporter

📞 Phone / WhatsApp / WeChat: +8615769214734

📧 Email: office@dongmjd.com

🌐 Website: www.cndmmetal.com

Send Us Your Required Size, Standard, Quantity, and Destination Port for a Fast Technical Quotation.

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API 5L Grade B PSL1 Pipe Manufacturer & Supplier | Seamless & ERW Line Pipe for Oil & Gas Applications