API 5L X42N ERW Steel Tube Black Painted 3LPE Coating

API 5L X42N ERW Steel Pipe is a high-frequency electric resistance welded line pipe compliant with international petroleum and natural gas transmission standards. Manufactured strictly per API 5L specification and dimensional standard ASME B36.10, this pipe features stable mechanical performance, excellent weld integrity, and superior corrosion resistance. The N grade indicates normalized heat treatment, delivering uniform microstructure, low residual stress, and outstanding ductility for harsh pipeline service conditions.

We provide dual surface protection solutions: external black anti-rust varnish coating and heavy-duty 3LPE (3-layer polyethylene) anti-corrosion coating. All pipes are finished with standard beveled pipe ends for seamless on-site welding, and adopt bulk anti-collision packaging for ocean freight, ensuring intact product delivery for global engineering projects.

1.Mechanical Properties (API 5L Standard)

2.Chemical Composition (Max %, PSL2)

3.Packaging & Shipping Standard

Adopting bulk cargo anti-collision professional packaging suitable for ocean freight, fully adapting to long-distance sea transportation and multi-handling operations:

• Pipe bevel ends are protected by plastic end caps to avoid collision deformation, scratch and welding surface damage
• Soft rubber spacers are added between stacked pipes to prevent friction and coating peeling
• Integral steel strapping + waterproof woven cloth wrapping, rainproof, dustproof and anti-loose
• Bulk stowage for large orders to maximize container loading rate and reduce logistics cost
• Custom marking (standard steel grade, size, standard, batch number, weight) on each pipe for easy identification and acceptance

 4.Coating Technology Introduction

》Black Anti-rust Varnish Coating

The external black varnish coating is a cost-effective temporary protection solution. The uniform, smooth black paint film tightly adheres to the pipe surface, effectively isolating air, moisture and dust to prevent surface oxidation and rust during short-term storage, transportation and indoor service. It features quick drying, scratch resistance and easy cleaning, suitable for conventional industrial pipeline projects with low corrosion risk.

》3LPE Anti-corrosion Coating

3LPE three-layer polyethylene anti-corrosion coating is a mainstream high-end anti-corrosion solution for long-distance oil and gas pipelines, composed of three functional layers:

First Layer (Epoxy Primer): High-adhesion epoxy powder coating, tightly bonded to the steel pipe surface, resisting chemical corrosion and penetrating adhesion

Second Layer (Adhesive Layer): Special copolymer adhesive, connecting the primer and outer PE layer to avoid coating delamination

Third Layer (PE Outer Layer): High-density polyethylene layer, providing mechanical protection against impact, abrasion and external extrusion

3LPE coating features ultra-low water absorption, excellent chemical resistance (acid, alkali, salt), strong mechanical toughness, and a service life of more than 30 years in underground and marine environments, widely used in harsh outdoor and subsea pipeline projects.

API 5L X42N ERW steel pipe with dual coating solutions is widely applicable to medium and low-pressure fluid transmission projects in petroleum, chemical, municipal and energy industries, covering:

• Oil & Gas Transmission: Onshore & offshore crude oil, natural gas, coal bed gas long-distance transmission pipelines
• Municipal Engineering: Urban natural gas pipe network, municipal water supply and drainage pipeline, heating pipeline
• Industrial Fluid Delivery: Chemical plant medium transmission, factory circulating water, compressed air pipeline
• Energy Engineering: Thermal power plant auxiliary pipeline, new energy supporting pipeline system
• Offshore & Port Projects: Marine shallow water pipeline, port fluid transmission pipeline (3LPE coated version)

Q1: What is the difference between X42 and X42N grade?

X42 is the basic grade, while X42N adopts normalized heat treatment. X42N has more uniform grain structure, lower residual stress, better low-temperature toughness and bending performance, avoiding brittle fracture in low-temperature environments, more suitable for high-standard long-distance pipeline projects.

Q2: Are the pipe dimensions strictly compliant with ASME B36.10?

Yes. All outer diameters, wall thicknesses, pipe lengths and tolerance ranges of our ERW pipes are fully implemented in accordance with ASME B36.10 standard, and support custom schedule sizes to meet different engineering design requirements.

Q3: Can I choose different coating solutions?

Absolutely. We support two optional coatings: black anti-rust varnish for short-term protection and cost-sensitive projects; 3LPE heavy anti-corrosion coating for long-term underground, outdoor and marine harsh working conditions. Custom coating thickness is also available.

Q4: What is the pipe end processing standard?

Standard beveled end (30°/37.5°) with precise cutting and deburring treatment, ensuring flat and smooth pipe ends for fast and firm on-site welding. Flat ends and special bevel angles can be customized according to customer drawings.

Q5: What quality tests will be conducted before delivery?

All pipes pass strict factory tests including: hydraulic pressure test, ultrasonic weld non-destructive testing, tensile & impact mechanical performance test, chemical composition analysis, dimensional tolerance inspection and coating adhesion test. Complete test reports and certification documents can be provided.

Q6: How to ensure no damage during ocean transportation?

We adopt professional bulk anti-collision packaging: end cap protection, inter-pipe anti-friction cushioning, overall waterproof wrapping and firm steel strapping. The packaging is specially optimized for sea freight vibration and collision scenarios to maximize product integrity rate.

Q7: What is your MOQ and delivery time?

Small batch trial orders are acceptable. Conventional sizes have stock support with 7-10 days delivery; bulk customized orders take 15-25 days. We support flexible packaging and logistics solutions for global customers.

How To Cooperate With Us?

Our address

Rm1406,14th/F No 208, Hongqi Road, Nankai Dist, Tianjin City ,China

Phone Number(WhatsApp/Wechat)

+8616622033809

E-mail

alisa@tjshenzhoutong.com

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