Special Offers for Hard-to-Find Materials & Custom Sizes

DLSS supports urgent, non-standard, and corrosion-resistant piping projects with special materials, custom sizes, and flexible inspection requirements.

DLSS Here We Help Special Offers

When Standard Sizes Are Not Enough

Many heat exchanger, shipbuilding, petrochemical, and maintenance projects require materials or sizes that are not easy to find from standard stock. DLSS helps customers handle special material grades, non-standard dimensions, urgent replacement orders, and project inspection requirements.

Urgent replacement and fast sourcing support

Nickel alloy, duplex, titanium, copper nickel available

Custom OD, WT, length, radius, and machining

TPI, PMI, UT, ET, HT, MTC 3.1/3.2 support

Special Materials We Support

Not sure which material is suitable? Send us your working temperature, medium, pressure, and drawing. Our team can help check the possible material options.

Stainless Steel

304 / 304L
316 / 316L
321 / 321H
347 / 347H
310S
904L

Duplex & Super Duplex

S31803 / 2205
S32205
S32750 / 2507
S32760
S31254 / 254SMO

Nickel Alloys

Inconel 600 / 625
Incoloy 800H / 825
Hastelloy C276 / C22
Monel 400
Alloy 20
Nickel 200 / 201

Titanium & Copper Alloys

Titanium Grade 2
C70600
C71500
C68700
C44300
C12200

Custom Sizes & Non-standard Requirements

Based on drawings or technical specifications

Requirement	DLSS Support
Outside Diameter	Custom OD according to project requirements
Wall Thickness	Thin-wall and thick-wall options
Length	Fixed length, random length, extra-long tubes
U Tube Radius	Custom bending radius based on drawing
Finned Tube Design	Low fin, spiral fin, corrugated tube options
Flange Size	Non-standard thickness, bore, length, facing
Tube Sheet	Drilling, machining, drawing-based production
Packing	Wooden case, bundle, export seaworthy packing

Special Supply for Heat Exchanger Projects

Heat Exchanger Tubes

Straight tubes for condensers, boilers, evaporators, and pressure equipment.

U Tubes

Custom bending radius, fixed leg length, stress relief heat treatment, and wooden case protection.

Low Finned Tubes

For heat transfer efficiency improvement in condensers, coolers, and boiler-related equipment.

Tube Sheets

Customized drilling, machining, material matching, and drawing-based production.

Flanges & Fittings

Matching flanges, elbows, reducers, tees, forged fittings, and project piping components.

For replacement projects, DLSS can help match the original material, size, inspection standard, and packing method to reduce project risk.

Inspection & Project Documents Available

Inspection / Document	Available Support
MTC	EN 10204 3.1 / 3.2
PMI	Positive Material Identification
UT	Ultrasonic Testing
ET	Eddy Current Testing
HT	Hydrostatic Test
Flattening / Flaring	For tube quality verification
Visual Inspection	Surface and dimension checking
TPI	BV, SGS, TUV, LR, ABS, DNV etc.
Packing Documents	Packing list, photos, marking, shipping documents

How DLSS Supports Special Projects

How to Ensure NACE

Introduction Sour gas environments—containing hydrogen sulfide (H₂S)—pose one of the greatest challenges for stainless steel tubes in the oil and gas industry. The presence of H₂S increases the risk of sulfide stress cracking (SSC) and hydrogen-induced cracking (HIC), which can lead to catastrophic failures if materials are not selected and tested properly. To mitigate these […]

Welded vs. Seamless Tubes:

Choosing between welded and seamless tubes can impact your heat exchanger’s performance, durability, and cost. While both have their place, understanding their differences helps engineers and purchasers make informed decisions. In this blog, we compare these two types of stainless steel tubes and highlight where each one excels. 1. Manufacturing Process This difference affects the structural integrity and mechanical […]

ASTM A213 vs A269:

Introduction Two of the most frequently specified standards for stainless steel tubing are ASTM A213 and ASTM A269. Both cover austenitic stainless steel tubes like TP304L, TP316L, and TP321. However, their scope, tolerances, and test requirements differ significantly—especially for heat exchanger and pressure service applications. This article provides a clear, side-by-side comparison to help you […]

Will Stainless Steel Seamless

Introduction A common question among engineers and procurement teams is: “If it’s called stainless, can it rust?” The name “stainless steel” suggests perfect rust resistance—but in reality, stainless steel can corrode under certain conditions. Understanding when and why this happens is essential to material selection and system reliability. This article dives into the corrosion behavior […]

Customer Request	DLSS Response
“We need nickel alloy tubes urgently.”	Check stock, mill schedule, and air shipment option
“The size is not standard.”	Review drawing and confirm production feasibility
“We need U tubes with fixed radius.”	Confirm radius, leg length, heat treatment, and packing
“The end user requires TPI.”	Coordinate BV, SGS, TUV, LR, ABS, or DNV inspection
“We only need a small quantity.”	Check sample, trial order, or small-batch support
“We need replacement tubes for an old exchanger.”	Match material, size, standard, and inspection requirements

FAQ

Can DLSS supply non-standard sizes?

Yes. DLSS can support customized OD, wall thickness, length, bending radius, flange dimensions, and drawing-based production.

Do you support small quantity orders?

For special materials or replacement projects, DLSS can check stock, sample availability, or small-batch production based on the requirement.

Can you arrange third-party inspection?

Yes. DLSS can coordinate third-party inspection such as BV, SGS, TUV, LR, ABS, and DNV according to project requirements.

What information should I provide for a special offer?

Please provide material grade, size, quantity, drawing, standard, inspection requirement, delivery time, and destination port.

Can DLSS support urgent air shipment?

For urgent replacement or maintenance projects, DLSS can help check stock, production feasibility, packing schedule, and air shipment options.

Do you provide material alternatives?

DLSS can help review the project condition and discuss possible material options, but final material selection should be confirmed by the project engineer or end user.

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