Womic Stainless Steel Co., Ltd
Exceptional Pitting and Crevice Corrosion Resistance:
PRE ≥ 42 (typically 42–45) due to high chromium (24–26%), molybdenum (3.0–5.0%), and nitrogen (0.24–0.32%) content, providing superior resistance in seawater, brackish water, and aggressive chemical media.
Superior Chloride Stress Corrosion Cracking Resistance:
Excellent resistance to chloride-induced SCC, significantly outperforming both austenitic grades and standard duplex 2205 in high-temperature, high-chloride environments.
Ultra-High Mechanical Strength:
Minimum yield strength of ≥ 550 MPa (approximately 3.2 times that of TP316L and 1.2 times that of Duplex 2205), allowing for significantly thinner wall sections, weight reduction, and improved heat transfer efficiency.
Excellent Heat Transfer Efficiency:
Higher thermal conductivity than austenitic stainless steels (approximately 30% higher than TP316L) combined with the ability to use thinner walls due to ultra-high strength results in superior overall heat transfer coefficients.
Good High-Temperature Performance:
Maintains excellent corrosion resistance and mechanical properties up to 250°C (482°F) in chloride service, and up to 300°C (572°F) in non-chloride service.
High Resistance to Erosion and Corrosion Fatigue:
Outstanding resistance to high-velocity seawater and slurry heat exchanger applications where combined mechanical and corrosive attack occurs.
Low Thermal Expansion:
Lower coefficient of thermal expansion than austenitic grades, reducing thermal stress in tube sheets and improving fatigue life in cyclic thermal service.
Excellent Weldability:
Maintains balanced ferrite/austenite ratio in the weld zone when using proper welding procedures and matching filler metals (ER2594).
Precision Dimensional Accuracy:
Strict tolerances on outside diameter (OD), wall thickness, and concentricity ensure proper fitment in tube sheets and consistent heat transfer performance.
International Certification:
Tubes can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK M-630, ISO 17781, and NACE MR0175/ISO 15156 for sour service applications.
The Super Duplex 2507 Heat Exchanger Tubes produced by Womic Steel conform to multiple international specifications used in high-performance heat transfer equipment, pressure vessels, and extreme corrosive service:
|
Standard |
Description |
Equivalent Grade / Material Number |
|
ASTM A789 / ASME SA789 |
Seamless and welded ferritic/austenitic stainless steel tubing for general service |
S32750 |
|
ASTM A790 / ASME SA790 |
Seamless and welded ferritic/austenitic stainless steel pipe |
S32750 |
|
ASTM A213 / ASME SA213 |
Seamless ferritic and austenitic alloy steel boiler, superheater, and heat exchanger tubes |
S32750 (upon agreement) |
|
EN 10216-5 |
Seamless stainless steel tubes for pressure purposes |
1.4410 (X2CrNiMoN25-7-4) |
|
EN 10217-7 |
Welded stainless steel tubes for pressure purposes |
1.4410 (X2CrNiMoN25-7-4) |
|
DIN 17458 |
Austenitic stainless seamless tubes (super duplex supplement) |
X2CrNiMoN25-7-4 |
|
JIS G3463 |
Stainless steel boiler and heat exchanger tubes |
SUS329J4L |
|
GB/T 21833 |
Seamless and welded duplex stainless steel pipes for heat exchanger |
022Cr25Ni7Mo4N |
|
ISO 17781 |
Duplex stainless steel tubes for petroleum and natural gas industries |
1.4410 |
|
NACE MR0175 / ISO 15156 |
Sour service compliance |
S32750 |
|
API 5LC |
CRA line pipe for oil and gas |
S32750 |
These standards ensure that Super Duplex 2507 Heat Exchanger Tubes meet global requirements for chemical composition, balanced dual-phase microstructure, superior mechanical performance, dimensional accuracy, and non-destructive examination.
Different specifications can be customized according to special requirements.
|
Execution Standard |
Main Standard |
Standard Grade |
|
ASTM (USA) |
ASTM A213, A269, A249, A789, A790 |
TP304/L, TP316/L, TP321/H, TP347/H, S31803, S32205, S32750, S32760 |
|
ASME (USA) |
SA213, SA249, SA789, SA790 |
TP304/L/H, TP316/L/H, TP321/H, TP347/H, S31803, S32205, S32750, S32760 |
|
EN / DIN (Europe) |
EN 10216-5, EN 10217-7 |
X2CrNi18-9 (1.4307), X2CrNiMo17-12-2 (1.4404), X2CrNiMoN22-5-3 (1.4462), X2CrNiMoN25-7-4 (1.4410) |
|
JIS (Japan) |
JIS G3463 |
SUS304TB, SUS304LTB, SUS316TB, SUS316LTB, SUS321TB, SUS347TB, SUS329J3L, SUS329J4L |
|
GB (China) |
GB/T 13296, GB/T 21833 |
06Cr19Ni10, 022Cr19Ni10, 07Cr17Ni12Mo2, 022Cr17Ni12Mo2, 022Cr22Ni5Mo3N, 022Cr25Ni7Mo4N |
|
ISO (International) |
ISO 9329-4, ISO 17781 |
X2CrNi18-9, X2CrNiMo17-12-2, X2CrNiMoN22-5-3, X2CrNiMoN25-7-4 |
|
Element |
C |
Mn |
P |
S |
Si |
Cr |
Ni |
Mo |
N |
Cu |
|
S32750 |
≤0.030 |
≤1.20 |
≤0.035 |
≤0.020 |
≤0.80 |
24.0–26.0 |
6.0–8.0 |
3.0–5.0 |
0.24–0.32 |
≤0.50 |
Note: Super Duplex 2507 contains higher chromium, molybdenum, and nitrogen compared to Duplex 2205, resulting in a PRE value of ≥42 (compared to ≤35 for 2205). The high nitrogen content promotes austenite stability, significantly increases pitting resistance, and enhances mechanical strength. Compared to Duplex 2205 and TP316L for heat exchanger service:
|
Property |
TP316L |
Duplex 2205 |
Super Duplex 2507 |
Advantage |
|
Yield Strength (MPa) |
≥170 |
≥450 |
≥550 |
2507 (3.2x stronger than 316L) |
|
PRE |
24–26 |
34–35 |
≥42 |
2507 (highest pitting resistance) |
|
Thermal Conductivity (W/m·K) |
16.3 |
19.0 |
19.5 |
2507 (20% higher than 316L) |
|
CTE (μm/m·K, 20–100°C) |
15.9 |
13.5 |
13.0 |
2507 (lowest thermal stress) |
|
Seawater Service |
Limited |
Good |
Excellent |
2507 preferred for seawater |
|
Wall Thickness Required |
Standard |
Reduced |
Further reduced |
2507 (lightest, best heat transfer) |
Pitting Resistance
Equivalent (PRE) Calculation:
PRE = %Cr + 3.3 × %Mo + 16 × %N ≥ 42 (typically 42–45)
The Super Duplex 2507 Heat Exchanger Tube offers exceptional strength and good ductility, with excellent properties for demanding heat transfer applications.
|
Property |
Unit |
S32750 |
|
Tensile Strength (min) |
MPa |
≥800 |
|
Yield Strength (0.2% offset, min) |
MPa |
≥550 |
|
Elongation (min) |
% |
≥25 |
|
Hardness (Brinell, max) |
HBW |
≤310 |
|
Hardness (Rockwell C, max) |
HRC |
≤32 |
|
Density |
g/cm³ |
7.80 |
|
Melting Range |
°C |
1350–1400 |
|
Thermal Conductivity (20°C) |
W/m·K |
19.5 |
|
Thermal Conductivity (100°C) |
W/m·K |
20.0 |
|
Coefficient of Thermal Expansion (20–100°C) |
μm/m·K |
13.0 |
|
Specific Heat Capacity (20°C) |
J/kg·K |
480 |
|
Electrical Resistivity (20°C) |
μΩ·m |
0.85 |
Impact Toughness (Charpy V-Notch, typical at -46°C) :
Longitudinal: ≥ 70 J (typical)
Transverse: ≥ 50 J (typical)
Maximum Recommended Service Temperatures:
|
Service Condition |
Maximum Temperature |
|
Continuous Service (Seawater/Chloride Environment) |
250°C (482°F) |
|
Continuous Service (Non-Chloride Environment) |
300°C (572°F) |
|
Intermittent Service |
325°C (617°F) |
|
Sour Service (NACE MR0175) |
232°C (450°F) |
|
Minimum Service Temperature |
-50°C (-58°F) |
Critical Note: Super Duplex 2507 is not recommended for prolonged service above 300°C due to the risk of embrittling intermetallic phase precipitation (sigma phase). For heat exchanger applications above 300°C, austenitic grades (TP321/TP347/TP310S) should be considered.
Heat Treatment
Condition:
Super Duplex 2507 Heat Exchanger Tubes are solution annealed at 1050–1120°C followed by rapid cooling (water quenching) .
This heat treatment:
· Restores the balanced 40–60% ferrite / 40–60% austenite microstructure.
· Dissolves unwanted intermetallic phases (sigma, chi) that form readily in super duplex grades.
· Relieves internal stresses from cold drawing or cold pilgering.
· Ensures optimal mechanical properties and maximum corrosion resistance.
Critical Note: Super Duplex 2507 requires immediate water quenching after solution annealing. Air cooling is completely unacceptable and will result in intermetallic phase precipitation, severely reducing corrosion resistance and toughness. The quenching delay must be kept under 30 seconds.
Delivery Condition:
Tubes are normally supplied in solution annealed and pickled condition, providing a
clean, smooth surface and excellent corrosion resistance. Bright annealing is
not recommended for super duplex grades due to the water quenching requirement.
Womic Steel adopts advanced production technology and stringent process control to ensure each Super Duplex 2507 Heat Exchanger Tube meets exact specifications with balanced microstructure and flawless surface quality.
Raw Material Selection: High-quality S32750 super duplex billets from certified premium mills (Outokumpu, Sandvik, POSCO) with certified chemical composition and ferrite/austenite balance. Raw material traceability is maintained from melt to final product.
Heating and Piercing: Billets heated to a carefully controlled, narrow temperature range (lower than duplex 2205 to prevent ferrite coarsening and intermetallic formation) and pierced using a rotary piercing mill. Temperature monitoring is continuous.
Hot Rolling: Shells elongated and rolled to desired intermediate size with strict temperature control and reduced reduction rates to prevent cracking.
Cold Drawing / Cold Pilgering: Tubes refined to precise dimensions with improved surface finish, enhanced mechanical properties, and work hardening control. Multiple intermediate solution annealing steps are required due to rapid work hardening.
Solution Annealing (Intermediate and Final) : Multiple solution annealing steps at 1050–1120°C followed by immediate water quenching to maintain phase balance throughout the manufacturing process.
Pickling & Passivation: Removal of oxides using specialized pickling acids optimized for super duplex grades; extended pickling time and thorough rinsing required.
Straightening and Dimensional Calibration: Ensures consistent roundness, straightness, and wall uniformity. Special attention to OD tolerance for tube sheet fitment.
Cutting and End Finishing: Tubes cut to precise lengths with square ends, deburred, and prepared for tube sheet insertion.
Ferrite Content Measurement: Verification of phase balance – typically 35–65% ferrite.
Final Inspection & Marking: Each tube tested, marked with grade, heat number, standard, and tube dimensions before packing.
This rigorous process guarantees a balanced dual-phase microstructure, smooth internal bore, high structural integrity, precise dimensional accuracy, and exceptional corrosion resistance across all batches of Womic Steel’s Super Duplex 2507 Heat Exchanger Tubes.
Womic Steel utilizes state-of-the-art manufacturing technology with specialized procedures for super duplex to ensure every Welded Super Duplex 2507 Heat Exchanger Tube meets precise specifications with weld zone phase balance and excellent corrosion resistance.
1. Raw Material Selection: High-quality S32750 super duplex stainless steel strips/coils from certified premium mills with full traceability.
2. Slitting & Uncoiling: Precision slitting to required width; edge preparation to ensure clean, burr-free edges for welding.
3. Forming & Welding: The strip is progressively formed into a cylindrical shape. The edges are welded using advanced TIG or Plasma welding with:
Strict heat input control (typically 0.3–1.0 kJ/mm)
Shielding gas: Ar + N₂ (3–5% nitrogen) to prevent nitrogen loss
Matching filler metal: ER2594 for optimal weld properties
Pre-weld and post-weld purge gas protection on ID and OD
4. Weld Seam Treatment: External weld bead removal to achieve smooth surface flush with base metal. Internal bead may be controlled or removed.
5. Solution Annealing: Full heat treatment of the entire welded tube at 1050–1120°C followed by immediate water quenching – absolutely essential for restoring corrosion resistance and balanced microstructure in the weld and HAZ. Quenching delay must be under 30 seconds.
6. Sizing & Calibration: The tube is passed through a sizing mill to achieve final precise OD and roundness.
7. Straightening: The tube is straightened to ensure optimal linearity for tube sheet insertion.
8. Non-Destructive Testing (NDT) : Weld seam inspected using Eddy Current Testing (ECT) or Ultrasonic Testing (UT). 100% of tube length tested.
9. Hydrostatic Testing: Each tube pressure tested to verify leak-tight integrity.
10.Ferrite Content Measurement: Verification of weld and base metal phase balance (35–65% ferrite).
11.Corrosion Testing: Pitting resistance test per ASTM G48 Method A – 24 hours in 6% FeCl₃ at 40°C – no pitting.
12.Final Inspection & Marking: Complete dimensional check, visual inspection, and traceable marking.
This controlled process guarantees a sound weld seam, excellent dimensional accuracy, balanced super duplex microstructure, and superior corrosion resistance for every batch of Womic Steel’s Welded Super Duplex 2507 Heat Exchanger Tubes.
Outside Diameter (OD) : 6.0mm – 114.3mm (1/4″ – 4″)
Common sizes: 12.70mm (1/2″), 15.88mm (5/8″), 19.05mm (3/4″), 25.40mm (1″), 31.80mm (1-1/4″), 38.10mm (1-1/2″), 44.50mm (1-3/4″), 50.80mm (2″)
Wall Thickness (WT) : 0.5mm – 5.0mm (BWG 10 – BWG 22)
Due to ultra-high strength (yield strength 550 MPa), significantly thinner walls can be used compared to austenitic grades
Common BWG gauges: 10, 11, 12, 13, 14, 15, 16
Length: Up to 30m (straight lengths); U-bent tubes available per customer drawing
OD Tolerances:
Standard: ±0.10mm
Precision: ±0.05mm (upon request)
Wall Thickness Tolerances:
Standard: ±10% of nominal
Precision: ±8% of nominal (upon request)
Straightness: 0.5mm per 1000mm length typical, tighter upon request
Surface Roughness (Internal) :
Standard: Ra ≤ 0.8μm
Polished: Ra ≤ 0.4μm (upon request)
|
ANSI B 36.19/ANSI B36.10 DIMENSIONS OF SEAMLESS &WELDED STAINLESS STEEL PIPE |
|||||||||||||||||||
|
Nominalsize |
mm |
ANSIB36.19 |
ANSIB36.10ANSIB36.10 |
||||||||||||||||
|
DN |
NPS |
mm |
5S |
10S |
40S |
80S |
10 |
20 |
30 |
STD |
40 |
60 |
XS |
80 |
100 |
120 |
140 |
160XXS |
|
|
6 |
1/8" |
10.29 |
|
1.24 |
1.73 |
2.41 |
|
|
|
1.73 |
1.73 |
|
2.41 |
2.41 |
|
|
|
|
|
|
8 |
1/4" |
13.72 |
|
1.65 |
2.24 |
3.02 |
|
|
|
2.24 |
2.24 |
|
3.02 |
3.02 |
|
|
|
|
|
|
10 |
3/8" |
17.15 |
|
1.65 |
2.31 |
3.20 |
|
|
|
2.31 |
2.31 |
|
3.20 |
3.20 |
|
|
|
|
|
|
15 |
1/2" |
21.34 |
1.65 |
2.11 |
2.77 |
3.73 |
|
|
|
2.77 |
2.77 |
|
3.73 |
3.73 |
|
|
|
4.78 |
7.47 |
|
20 |
3/4" |
26.67 |
1.65 |
2.11 |
2.87 |
3.91 |
|
|
|
2.87 |
2.87 |
|
3.91 |
3.91 |
|
|
|
5.56 |
7.82 |
|
25 |
1" |
33.4 |
1.65 |
2.77 |
3.38 |
4.55 |
|
|
|
3.38 |
3.38 |
|
4.55 |
4.55 |
|
|
|
6.35 |
9.09 |
|
32 |
1 1/4" |
42.16 |
1.65 |
2.77 |
3.56 |
4.85 |
|
|
|
3.56 |
3.56 |
|
4.85 |
4.85 |
|
|
|
6.35 |
9.70 |
|
40 |
1 1/2" |
48.26 |
1.65 |
2.77 |
3.68 |
5.08 |
|
|
|
3.68 |
3.68 |
|
5.08 |
5.08 |
|
|
|
7.14 |
10.16 |
|
50 |
2" |
60.33 |
1.65 |
2.77 |
3.91 |
5.54 |
|
|
|
3.91 |
3.91 |
|
5.54 |
5.54 |
|
|
|
8.74 |
11.07 |
|
65 |
2 1/2" |
73.03 |
2.11 |
3.05 |
5.16 |
7.01 |
|
|
|
5.16 |
5.16 |
|
7.01 |
7.01 |
|
|
|
9.52 |
14.02 |
|
80 |
3" |
88.9 |
2.11 |
3.05 |
5.49 |
7.62 |
|
|
|
5.49 |
5.49 |
|
7.62 |
7.62 |
|
|
|
11.13 |
15.24 |
|
90 |
3 1/2" |
101.6 |
2.11 |
3.05 |
5.74 |
8.08 |
|
|
|
5.74 |
5.74 |
|
8.08 |
8.08 |
|
|
|
|
|
|
100 |
4" |
114.3 |
2.11 |
3.05 |
6.02 |
8.56 |
|
|
|
6.02 |
6.02 |
|
8.56 |
8.56 |
|
11.13 |
|
13.50 |
17.12 |
|
125 |
5” |
141.3 |
2.77 |
3.40 |
6.55 |
9.52 |
|
|
|
6.55 |
6.55 |
|
9.52 |
9.52 |
|
12.70 |
|
15.90 |
19.05 |
|
150 |
6" |
168.28 |
2.77 |
3.40 |
7.11 |
10.97 |
|
|
|
7.11 |
7.11 |
|
10.97 |
10.97 |
|
14.30 |
|
18.20 |
21.95 |
|
200 |
8" |
219.08 |
2.77 |
3.76 |
8.18 |
12.70 |
|
6.35 |
7.04 |
8.18 |
8.18 |
10.30 |
12.70 |
12.70 |
15.10 |
18.20 |
20.60 |
23.00 |
22.22 |
|
250 |
10" |
273.05 |
3.40 |
4.19 |
9.27 |
12.70 |
|
6.35 |
7.80 |
9.27 |
9.27 |
12.70 |
12.70 |
15.09 |
18.26 |
21.44 |
25.40 |
28.58 |
|
|
300 |
12" |
323.85 |
3.96 |
4.57 |
9.52 |
12.70 |
|
6.35 |
8.38 |
9.52 |
10.31 |
14.27 |
12.70 |
17.48 |
21.44 |
25.40 |
28.58 |
33.32 |
|
|
350 |
14" |
355.6 |
3.98 |
4.78 |
|
|
6.35 |
7.92 |
9.52 |
9.52 |
11.13 |
15.09 |
12.70 |
19.05 |
23.83 |
27.79 |
31.75 |
35.71 |
|
|
400 |
16" |
406.4 |
4.19 |
4.78 |
|
|
6.35 |
7.92 |
9.52 |
9.52 |
12.70 |
16.66 |
12.70 |
21.44 |
26.19 |
30.96 |
36.53 |
40.49 |
|
|
450 |
18" |
459.2 |
4.19 |
4.78 |
|
|
6.35 |
7.92 |
11.13 |
9.52 |
14.27 |
19.05 |
12.70 |
23.83 |
29.36 |
34.92 |
39.67 |
45.24 |
|
|
500 |
20" |
508 |
4.77 |
5.53 |
|
|
6.35 |
9.52 |
12.70 |
9.52 |
15.09 |
20.62 |
12.70 |
26.19 |
32.54 |
38.10 |
44.45 |
50.01 |
|
|
550 |
22" |
558.8 |
4.77 |
5.53 |
|
|
6.35 |
9.52 |
12.70 |
9.52 |
15.87 |
22.22 |
12.70 |
28.57 |
34.92 |
41.27 |
47.62 |
53.97 |
|
|
600 |
24" |
609.6 |
5.54 |
6.35 |
|
|
6.35 |
9.52 |
14.70 |
9.52 |
17.48 |
24.61 |
12.70 |
30.96 |
38.89 |
46.02 |
52.37 |
59.94 |
|
|
650 |
26" |
660.4 |
|
|
|
|
7.92 |
12.70 |
|
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
700 |
28" |
711.2 |
|
|
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
750 |
30" |
762 |
6.35 |
7.92 |
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
|
800 |
32" |
812.8 |
|
|
|
|
7.92 |
12.70 |
15.88 |
9.52 |
|
|
12.70 |
|
|
|
|
|
|
Womic Steel offers surface finishes for Super Duplex 2507 heat exchanger tubes optimized for the high alloy content and critical applications.
|
Surface Type |
Description |
Typical Applications |
|
Annealed & Pickled (AP Finish) |
Standard industrial finish – matte, oxide-free after acid treatment. Recommended for all super duplex applications. |
Offshore, subsea, seawater, chemical service. |
|
Passivated Finish |
Surface chemically treated to enhance the protective passive film – strongly recommended for critical service. |
Deepwater offshore, sour service, high-chloride environments. |
|
Polished Finish (180#, 240#, 320#) |
Smooth mechanical finish – available upon request. |
Reduced fouling applications, specialized service. |
Note: Bright annealing is not possible for Super Duplex 2507 due to the mandatory water quenching requirement. Polished finishes are available upon request but are less common for super duplex grades.
Each Super Duplex 2507 Heat Exchanger Tube surface is inspected for uniform appearance, absence of pits, scratches, and consistent finish quality. Internal surface roughness (Ra) can be certified upon request.
Every Super Duplex 2507 Heat Exchanger Tube undergoes the most comprehensive inspection regime, including super duplex-specific critical tests:
|
Test / Inspection |
Description |
Applicability |
|
Visual & Dimensional Inspection |
Surface finish, OD, WT, length, roundness, straightness checked. |
100% |
|
Hydrostatic Pressure Test |
100% tested for leakage and pressure resistance. |
100% |
|
Eddy Current Test (ECT) |
Detects surface and sub-surface imperfections. |
100% |
|
Ultrasonic Test (UT) |
Ensures internal integrity of tube wall. |
100% (seamless) |
|
Positive Material Identification (PMI) |
Confirms correct chemical grade (Cr, Ni, Mo, N verification). |
100% (per heat) |
|
Ferrite Content Measurement |
Magnetic induction method – requirement: 35–65% ferrite. |
100% |
|
Microstructure Examination |
Verification of balanced dual-phase structure, absence of intermetallic phases (sigma, chi). |
Per heat / batch |
|
Tensile Testing |
Confirms ≥800 MPa UTS and ≥550 MPa yield strength. |
Per heat / batch |
|
Hardness Testing |
Brinell or Rockwell – max ≤310 HBW / ≤32 HRC. |
Per heat / batch |
|
Charpy Impact Testing |
Verifies low-temperature toughness at -46°C. |
Per heat (offshore mandatory) |
|
Intergranular Corrosion Test (IGC) |
ASTM A262 Practice E – validates resistance to sensitization. |
Per heat / batch |
|
Pitting Corrosion Test |
ASTM G48 Method A – 24 hours in 6% FeCl₃ at 40°C – no pitting. |
Per heat (NORSOK mandatory) |
|
Critical Pitting Temperature (CPT) |
ASTM G48 Method C – optional. |
Upon request |
|
Sour Service Qualification |
NACE MR0175/ISO 15156 compliance verification. |
Per project |
|
Flattening Test |
Evaluates ductility and deformation capability. |
Per heat / batch |
|
Flaring Test |
Evaluates ability to expand without cracking. |
Per heat / batch |
|
Surface Roughness Check (Ra) |
Profilometer measurement for polished tubes. |
Upon request |
|
Third-Party Inspection |
SGS / BV / DNV / TUV / LR – witnessed testing. |
Upon customer request |
These extensive tests ensure that every Super Duplex 2507 Heat Exchanger Tube from Womic Steel meets the highest international standards for reliability, corrosion resistance, and longevity in the most demanding heat transfer applications.
Super Duplex 2507 Heat Exchanger Tubes are specified for the most demanding applications where standard duplex 2205 or austenitic grades are insufficient:
|
Industry |
Typical Applications |
|
Deepwater Offshore Oil & Gas |
Seawater coolers, topside heat exchangers, subsea coolers, HP/HT heat exchangers, produced water coolers (ship classification certifications available from ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK). |
|
Marine Engineering |
Seawater-cooled condensers, ballast water heat exchangers, engine cooling systems, hydraulic oil coolers, exhaust gas heat recovery – for vessels operating in high-chloride environments. |
|
Desalination Plants |
Brine heaters, brine preheaters, multi-stage flash (MSF) evaporators, high-temperature reverse osmosis preheaters, energy recovery heat exchangers. |
|
Chemical Processing |
Shell-and-tube heat exchangers for high-chloride process streams, acid coolers (sulfuric, phosphoric, nitric), evaporators, condensers, reboilers. |
|
Flue Gas Desulfurization (FGD) |
Reheaters, gas-gas heaters (GGH), slurry heat exchangers, absorber coolers in coal-fired power plants. |
|
Pulp & Paper Industry |
Black liquor evaporators, bleach plant heat exchangers (chlorine dioxide service), digester heat recovery systems. |
|
Refining |
Crude oil heat exchangers (high-chloride crude), fractionator condensers, hydrotreater feed/effluent heat exchangers, sour service heat exchangers. |
|
Power Generation |
Coastal power plant condensers, cooling water heat exchangers, auxiliary coolers for seawater-cooled systems. |
|
Hydrometallurgy |
Pressure acid leaching (PAL) heat exchangers, solvent extraction heat exchangers, electrowinning solution coolers. |
|
Geothermal Energy |
Brine heat exchangers, steam condensers, hydrogen sulfide service heat exchangers. |
Each Super Duplex 2507 Heat Exchanger Tube is packed with the highest level of care due to the extreme value, long lead times, and critical nature of these products.
|
Packaging Type |
Description |
Suitable For |
|
Bundle Packing (Hexagonal) |
Hexagonal bundle with woven fabric wrapping, iron strip bundle, plastic cap on both ends. |
Local truck transport. |
|
Bundle Packing (Square) |
Square bundle with steel straps, plastic end caps, moisture barrier paper. |
Export sea-worthy transport. |
|
Wooden Crate Packing |
Wooden crates with foam padding, individual tube separation, plastic end caps. Recommended for super duplex. |
High-value tubes, long-length tubes. |
|
Steel Crate Packing |
Reinforced steel crates with internal padding. |
Heavy-wall tubes, multiple-bundle consolidation. |
|
U-Bend Tube Packing |
Custom wooden crates with support saddles to maintain bend radius. |
U-bent heat exchanger tubes. |
End Protection: Plastic caps on both ends for all tubes
Moisture Protection: VCI paper and moisture barrier wrapping for sea freight
Padding: Foam padding between tube layers in crates
Labeling: Grade, heat number, standard, dimensions, PO number
Documentation: Packing list, material test reports (MTR), inspection certificates
· Direct cooperation with global shipowners ensures the most competitive freight rates.
· Professional loading and securing teams – special care for tube bundles to prevent bending, scratching, and end damage.
· Efficient document preparation – EN 10204 3.1/3.2 certificates, MTR, PMI reports, ferrite measurement reports, corrosion test reports – minimizing customs delays.
· Rapid delivery time – select sizes of S32750 maintained in ready stock.
· Continuous cargo tracking and after-sales follow-up to ensure smooth arrival at destination.
· Custom length cutting available upon request – up to 30m straight lengths.
· U-bend tube fabrication – custom bending per customer drawing with full heat treatment after bending.
Womic Steel is a trusted manufacturer and exporter specializing in super duplex stainless steel heat exchanger tubes, committed to delivering premium quality and professional service for the world’s most demanding heat transfer applications.
1. Strict quality control under ISO 9001, PED 2014/68/EU, and NORSOK M-630 compliance.
2. Super duplex expertise – specialized knowledge in phase balance control, heat treatment (water quenching with <30 sec delay), and super duplex welding.
3. Modern production lines – cold pilger mills, TIG welded tube mills with nitrogen shielding.
4. Complete in-house testing – including ferrite measurement, PMI, ASTM G48 pitting corrosion testing, Charpy impact testing at -46°C.
5. NACE MR0175 compliance – full documentation for sour service applications.
6. Ultra-high strength – yield strength of 550 MPa allows 31% wall thickness reduction compared to TP316L.
7. Superior heat transfer – thinner walls + higher thermal conductivity = ~25% better heat transfer than TP316L.
8. Flexible customization – special OD, WT, length, surface finish, U-bends.
9. Fast production cycle – seamless and welded tube manufacturing with competitive lead times.
10.Reliable global shipping – to all major ports (Houston, Aberdeen, Dubai, Singapore, Perth, Rio de Janeiro, etc.).
11.Direct mill pricing – no middlemen, ensuring competitive costs for premium super duplex products.
12.Wide material range – from TP304/304L and TP316/316L to Duplex 2205, Super Duplex 2507, and nickel alloys.
For inquiries, technical support, or to request a quotation for your specific clad pipe requirements, please contact us:
Website: www.womicstainless.com
E‑mail: info@womicstainless.com
Tel / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568
Womic Steel – Your reliable partner for high‑quality stainless steel seamless pipes, metallurgically bonded clad tubes, and custom solutions for corrosion‑resistant applications.
