SS CORRUGATED TUBE GRADES

304,  304H,  321,  321H,  316L

S31803,  S32205,  317L,  904L

SS CORRUGATED TUBE

Normal Chemical Composition

to ASTM A213 ASTM A789

SS CORRUGATE TUBE SIZES

OD. 12-60mm
WT. 0.89-5.49mm (Maximum thickness up to 20mm according to customized requirements)
Straight tube length Max. >=35,000mm.(More than 35 meters)
Walmi Corrugate Stainless Steel Heat Exchanger tube compliance to standards below:

ASTM A213

EN10216-5

JIS G3463

DIN 17458

GB/T 13296

MTC: EN10204:2004 3.1

WORKING PRESSURE 

OD=Outside Diameter (mm) WT=Wall Thickness (mm)

200 * 12 * WT
OD

For example: tube 60.3 *2.77mm

Max. allowable working pressure

= 200 * 12 * 2.77
60.3

=110 kg/cm2

Walmi Stainless Steel Corrugate Tubes are austenitic stainless tubes, including grades containing the letter H, which can provide higher creep-rupture strength. The stainless heat exchanger tubes are always used at high temperature service, such as the cooling, heating, or re-heating of fluids, gases or air in a wide range of industries below:

♦ Heat exchangers

♦ Syngas coolers

♦ Power plant

♦ Power boilers

♦ Waste heat boilers

♦ Nuclear power generation

♦ Chemical processing

♦ Hydro carbon processing

♦ Oil refining

♦ Aerospace

One-stop materials service for stainless steel heat exchangers and boilers, including stainless steel U tubes, S tubes, forged flanges, tubesheets and baffles.

Value-added service are available in the following:

Stainless Steel Corrugated Tube is usually used in heat exchange equipment. Compared with ordinary seamless steel pipes, Stainless Steel Corrugated Tube has a larger heat exchange area, smaller tube wall thermal resistance.

Advantages

Specifications:

• The uneven surface of Stainless Steel Corrugated Tube makes the fluid form strong turbulence in the tube, thereby greatly improving the heat transfer coefficient of the inner and outer surfaces of the tube, and the overall heat transfer efficiency of the heat exchanger is increased by 2-3 times than that of the tube type.
• Stainless Steel Corrugated Tube is resistant to high temperature and can withstand large temperature and pressure differences
  Although the wall of the Stainless Steel Corrugated Tube is very thin (0.6-1.2mm), the special free forming process and unique arc shape greatly improve its pressure-bearing capacity. At the same time, the corrugated tube heat exchanger can adapt to a higher working temperature, up to 350°C. Corrugated pipe is a kind of flexible element with certain thermal compensation ability, good adaptability to large working temperature difference, small thermal stress of equipment, and obvious superiority over ordinary seamless steel pipe.
• The corrugated tube has a self-cleaning effect through thermal expansion and contraction, has the performance of not easy to scale, and compensates for the thermal stress caused by the temperature difference;
  Heat exchanger fouling, corrosion and blockage have always been a difficult problem to solve, especially when the water quality is poor, the water treatment effect is not good, the gas medium contains impurities or chemical reactions are prone to form fouling substances. The problem is particularly prominent. In the lighter case, the function of the heat exchanger decreases, the working condition deteriorates, the resistance becomes larger, and the energy consumption increases, while the worst case is that the heat exchanger is blocked and cannot operate, so the workload of maintenance, cleaning or renewal of the heat exchanger will also increase. Therefore, the use of Stainless Steel Corrugated Tubes for the tube bundle in the heat exchanger will completely solve this problem.
• Due to the compensation function of the Stainless Steel Corrugated Tube, the thermal stress of the tube sheet can be reduced, the tube opening will not be broken and the leakage problem will be caused, and the heat exchanger is safe and durable.In addition to the above advantages, the corrugated tube produced by Dongyan Energy Conservation has the advantages of strong corrosion resistance, longer life, no pitting, and low price.
• Stainless steel corrugated pipe has uniform stress distribution and strong corrosion resistance
  Because the stainless steel corrugated tube adopts a unique forming process, the feature of this process is that during the forming process, the deformation is not formed by the forced flow of metal in the mold, but a free-flowing “soft forming” process. Because there is no forced deformation, the forming process will not cause stress concentration, small residual stress, uniform stress distribution, no intercrystalline defects, and strong stress corrosion resistance.
• The stainless steel corrugated tube has a long service life and high cost performance.
  The corrugated pipe adopts ultra-thin stainless steel material, which on the one hand improves the service life of the product, but also greatly reduces the weight of the product, saves materials, reduces the cost of operation and maintenance, reduces the floor space, and greatly improves the cost-effectiveness of the product. The economic benefits are obvious.

U TUBE GRADES

304  304H  321  321H   316L

S31803  S32205  317L  904L

U TUBE CHEMICAL

Normal Chemical Composition

to ASTM A213  ASTM A789

U TUBE SIZES
OD.12.7- 38.1mm
WT. 0.89-5.49mm
R. 1.5*OD-1500mm (Minimum bending radius for OD over 28 mm after agreement.)
Leg length min. 1,000 mm.
Leg length max. 16,500 mm.
Straight tube length max. 35,000mm.
Heat treatment for radius up to 1500 mm

Walmi Stainless Steel U Tubes,Boiler, Super heater and Heat Exchanger tube compliance to standards below:

ASTM A213

EN10216-5

JIS G3463

DIN 17458

GB/T 13296

MTC: EN10204:2004  3.1

DELIVERY CONDITION

Solution heat treat & quench
Stress relieved after U – Bending
(bending area plus 300mm for each leg)

PRODUCTION PROCESS

Round Bar > Pipe blank > Cold Drawing
> NDT Testing > Mechanical Testing >
U-Bending > Hydrostatic Testing > Final Inspection

TOLERANCE

Outside Diameter, Wall Thickness, Length  of

ASTM A213 U tube according to ASTM A1016

Outside Diameter, Wall Thickness, Length  of

EN10216-5 pipe according to EN ISO 1127

MECHANICAL PROPERTIES

Intergranular corrosion test according

to ASTM A262 Pratic E.

Walmi stainless steel U tubes are all of the highest standard and will exceed all standard requirements without a shadow of a doubt.

Disclaimer
All data provided is for information and guidance only. Information above is not for design purposes and comes without warranty or guarantee with respect to the subject matter or fitness for purpose.

Walmi Stainless Steel U Tubes,Boiler, Super heater and Heat Exchanger Tube are austenitic stainless tubes, including grades containing the letter H, which can provide higher creep-rupture strength.  The stainless heat exchanger tubes are always used at high temperature service, such as the cooling, heating, or re-heating of fluids, gases or air in a wide range of industries below:

♦ Heat exchangers

♦ Syngas coolers

♦ Power plant

♦ Power boilers

♦ Waste heat boilers

♦ Nuclear power generation

♦ Chemical processing

♦ Hydro carbon processing

♦ Oil refining

♦ Aerospace

Walmi stainless steel heat exchanger tubes can also be delivered as U-bent tubes. Learn more.

Stainless Steel Hollow Bar is primarily used for the manufacture of radially machined components, a great variety of hollow products and cylindrical components, which will be used in conditions where where corrosion is an issue .The use of Hollow Bar is an economic and efficient means of supplying high quality raw material and a sensible alternative to the use of solid bar as it reduces machining requirements and minimizes material wastage.

Advantages

Specifications:

• Excellent availability, Reduced customer inventories.
• No minimum order, 1 piece stainless steel hollow bar order is accepted by Walmi Stainless Steel.
• Improved cutting speeds and feed rates, better machine utilization and reduced fixed cost per produced stainless steel component.
• Reduced tool wear, lower lubricant usage and machinery maintenance costs, better machine utilization through reduced stoppage time.
• Less machine setting-up time and and machine cycle times, lower labor and overhead costs for each stainless component.
• Faster machining, shorter production time due to excellent and consistent machining properties of stainless steel.
• Easier handling due to lower weight per un-machined component of the hollow bar.
• Very competitive from short to long series production of hollow bar compared to forging.
• shorter production time for hollow bar compared to bore out solid stainless steel bar.
• tangled chips can be avoided Due to limited internal machining