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400 Series Stainless Steel Tube


439 Stainless Steel Tube

A ferritic stainless steel tube specially formulated and processed for the harshest environments.

439 Stainless Headers

High-Grade Protection

Each Type 439 Stainless Steel Tube begins with special attention to chemical composition and processing to create a stainless steel with optimum formability as well as extreme oxidation, corrosion and heat resistance.

A ferritic stainless steel tube, type 439 outperforms both type 409 and 436 in oxidation and corrosion resistance in the most-demanding environments. Type 439 stainless steel tube withstands temperatures upwards of 1700˚F (927˚C), exceeding the limits of both types 409 and 436. Its chemical composition gives type 436 ideal formability for difficult-to-form systems and components.

Type 439 stainless steel tube withstands temperatures upwards of 1700˚F (927˚C), exceeding the limits of both types 409 and 436.

Resistant to wet, corrosive environments and possessing excellent formability makes type 439 stainless steel tube well-suited for automotive exhaust applications, especially when faced with high temperatures or chlorides.

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439 Stainless Steel Tube Specifications and Figures

Outside diameter capabilities
.3125” (7.938mm) – 5.000” (127mm)
Gauge capabilities
.025 (.638mm) - .157 (4.0mm)
Length capabilities
1.25” – 240.00”
Shape capabilities
D-shape, Double-D, Round, Square, Rectangle, Oval and specialty shapes
End Conditions
Haven Cut, Mill Cut, Brushed, Brushed Deburred, Drop, End facing and Chamfering
Finishing
ID/OD scarfing to remove extruded weld bead
100% American Steel

It's a lot more than steel that makes a Middletown tube. It's attention to your specifics.

Lets Make a Match

Why Choose Middletown Tube?

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More Than Steel

More than steel makes a Middletown tube. Our tubes exceed ATSM and industry standards by as much as 200%. Through destructive testing, we try each tube for weaknesses and strengths. Our XIRIS post-weld inspection uses laser-camera triangulation to measure weld geometry and contour irregularities.

It’s more than steel that makes a tube less likely to fail, split or break. A tube that follows lean manufacturing techniques and reaches a level of implausible lightweighting, allowing you to save resources and create better products. People with over 20+ years of experience make a Middletown tube, keep our 27 mills running to the tune of a 4-week turnaround and on-time delivery.

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Our Steel

Not just any steel becomes a Middletown steel tube. To find the most consistent and reliable steel, we trialed steel from mills both domestic and international. Time and again, AK Steel met our exact standards. Coil to coil, AK Steel adheres to the strictest chemistry and thickness control.

It’s pure American steel, the highest-rated; which is why 85% of our steel is AK Steel. To provide you superior service, we’ve located our mill next door to AK Steel.

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Onsite Metallurgical Lab

Heat and pressure may form Middletown Tube, but it’s research and innovation that mature it. Our onsite metallurgical lab tirelessly works towards higher standards of craft and precision with special attention to your specific requirements.

Our lab also troubleshoots customer and competitor tubing. To determine failure causes, we run an array of tests: Coating, metal composition, chemistries, hardness, gauge and more. With diagnosis in hand, we then provide the right tubing solution.

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Lock Down Steel Pricing

A steel coil warehouse is a rare, money-saving asset for customers. To help insulate you from fluctuations in steel prices, Middletown Tube offers the option of price lock. A large volume purchaser, Middletown Tube fills our dedicated warehouse with coils for contract customers.

Customers may lock in their steel rate for an entire year without worry of an increase in price. Middletown Tube carries the cost and stores the steel.

No Tube Should Be One-Size-Fits-All


Whatever the specification, Middletown Tube can match your exact need.

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