tubectrl.com | Premium Steel Tube & Pipe Solutions for Global Industries

About Ark International

Ark International is a world-class manufacturer and supplier of steel tube products, vertically integrated with our sister company KWK STEEL. With over 16 years of experience, we deliver precision-engineered tubing solutions trusted by industries across 50+ countries.

We play a crucial role in supporting critical applications in oil and gas, aerospace, nuclear energy, power generation, and medical equipment. Our reputation is built on innovation, quality assurance, and a customer-first service model.

16+

Years Experience

50+

Countries Exported

600+

Happy Customers

2000+

Orders Fulfilled

Our Premium Products

Engineered to meet international standards and deliver unmatched performance in extreme environments. From seamless boiler tubes to corrosion-resistant nickel alloys, our product range supports mission-critical operations globally.

Boiler/Heat Exchanger Tube

High-pressure seamless tubes for thermal systems. Ideal for power plants and industrial heating applications.

Standards: A106, A179, A192, A210, A213, A268

Applications: Power generation, refineries, HVAC

Nickel Alloy Tube

Exceptional corrosion and heat resistance for aggressive environments.

Grades: Hastelloy, Inconel, Incoloy, Monel

Uses: Chemical processing, aerospace, marine

Small Diameter Stainless Tube

Precision tubing for instrumentation and compact systems.

Grades: TP304, TP304L, TP316, TP316L

Diameters: Down to 3mm, tight tolerances

A/SA268 Stainless Steel Tube

Ferritic and martensitic stainless tubes for high-stress environments.

Grades: TP410, TP430, TP444, TP446

Standards: ASTM A268 / ASME SA268

Alloy Steel Tube

High-strength tubes for elevated temperature and pressure applications.

Grades: T2, T5, T9, T11, T12, T22

Applications: Superheaters, reformers, boilers

U Bend / S Shaped Tube

Pre-formed heat exchanger tubing for compact thermal systems.

Types: U-Bend, S-Shaped, Finned

Materials: Stainless, Alloy, Nickel

Duplex/Super Duplex Tube

Superior strength and chloride resistance for offshore and chemical use.

Grades: 2205, 2507, Zeron 100

Standards: ASTM A789, A790

Copper Alloy Tube

High thermal conductivity tubing for heat transfer systems.

Alloys: Cupronickel, Brass, Bronze

Uses: Condensers, cooling systems, marine

View Full Product Catalog

Why Choose tubectrl.com?

We combine advanced manufacturing, rigorous quality control, and global logistics to deliver reliable tube solutions on time, every time.

Quality Assured

Mill Test Certificates, third-party inspections, and full traceability on every order.

Timely Delivery

On-time shipment guaranteed with global logistics partners and real-time tracking.

24/7 Support

Dedicated team available around the clock for technical and logistics support.

One-Stop Shop

From raw material sourcing to final packaging and export documentation.

What Our Clients Say

"We are very proud to be associated with Ark Steel Tube. They deliver outstanding service and high-quality boiler tube and heat exchanger tube at the right price."

— Tim Brown

Philippines

"High-quality TP304 TP316 small diameter stainless steel tubing used extensively throughout our products. Great to see a company pushing out to the greater markets of the world with an excellent product to back their service."

— Dinesh Patil

Oman

"We prefer to use Ark for our nickel alloy tubes because of the great quality of the products, the quick production time, and the attractive price point. We use Ark’s Monel tube, Hastelloy tube, Inconel tube and wouldn’t hesitate to recommend them to others."

— James Smith

USA

Frequently Asked Questions

What standards do your tubes comply with?

Our products meet international standards including ASTM, ASME, DIN, EN, JIS, and GB. Specific standards vary by product type — for example, boiler tubes comply with ASTM A213/A268, while alloy tubes meet ASTM A335.

Can you provide custom tube dimensions and shapes?

Yes, we offer custom manufacturing for diameter, wall thickness, length, and bending (U-bend, S-shape, coiled). Our engineering team works with clients to meet exact specifications.

Do you offer third-party inspection services?

Absolutely. We support inspections by SGS, BV, TÜV, and other agencies. All orders include Mill Test Certificates, and inspection reports are available upon request.

What is your typical lead time?

Standard orders are shipped within 15–30 days. Urgent production can be arranged for select products. We provide real-time updates throughout the manufacturing and shipping process.

Which industries do you serve?

We supply to oil & gas, power generation (including nuclear), aerospace, chemical processing, marine, medical equipment, and HVAC industries worldwide.

Get in Touch

Reach out for product inquiries, technical support, or custom solutions. Our team is ready to assist you 24/7.

Email

sales@tubectrl.com

Phone

+86 576 8880 5030

+86 151 6866 6152

Skype / WeChat

Available on request

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Precision Steel Tube Manufacturing for Global Industries