Alloy 825 Heat Exchanger Tube,high-temperature alloy pipe,Stainless Steel Bolts,UNS N04400 Nickel Alloy Tubes

Key Features of Alloy 825 Heat Exchanger Tube

Exceptional Resistance to Reducing and Oxidizing Acids:

High nickel (38–46%), chromium (19.5–23.5%), molybdenum (2.5–3.5%), and copper (1.5–3.0%) provide outstanding resistance to both reducing acids (sulfuric, phosphoric) and oxidizing acids (nitric).

Superior Pitting and Crevice Corrosion Resistance:

Molybdenum and chromium content provide excellent resistance to pitting and crevice corrosion in chloride-containing environments, seawater, and sour service.

Excellent Stress Corrosion Cracking Resistance:

High nickel content provides outstanding resistance to chloride-induced SCC and sulfide-induced SSCC, significantly outperforming all stainless steel grades.

Outstanding Sulfuric and Phosphoric Acid Resistance:

Copper addition provides exceptional resistance to sulfuric acid (H₂SO₄) and phosphoric acid (H₃PO₄), making Alloy 825 the preferred choice for fertilizer and hydrometallurgical heat exchangers.

Excellent Resistance to Sour Service (H₂S):

Fully compliant with NACE MR0175/ISO 15156 for sour service applications up to 232°C (450°F), suitable for oil and gas heat exchangers handling H₂S-containing streams.

Good High-Temperature Strength:

Maintains excellent mechanical properties up to 540°C (1000°F), suitable for high-temperature heat transfer applications.

Titanium Stabilization:

Titanium addition (0.6–1.2%) stabilizes the alloy against intergranular corrosion after welding or high-temperature exposure.

Good Heat Transfer Efficiency:

Thermal conductivity comparable to austenitic stainless steels, with excellent heat transfer performance in corrosive environments.

Excellent Weldability:

Nickel-based alloy offers good weldability with matching filler metals (ERNiCrMo-3 or ERNiCrMo-10), suitable for tube-to-tubesheet welding.

Precision Dimensional Accuracy:

Strict tolerances on outside diameter (OD), wall thickness, and concentricity ensure proper fitment in tube sheets.

International Certification:

Tubes can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NACE MR0175/ISO 15156 and ASME Boiler & Pressure Vessel Code Section VIII for pressure equipment.

Alloy 825 Heat Exchanger Tube Related International Standards and Grades

The Alloy 825 Heat Exchanger Tubes produced by Womic Steel conform to multiple international specifications used in corrosive and high-temperature heat transfer equipment:

Standard	Description	Equivalent Grade / Material Number
ASTM B163 / ASME SB163	Seamless nickel and nickel alloy condenser and heat exchanger tubes	UNS N08825 (Alloy 825)
ASTM B423 / ASME SB423	Seamless nickel-iron-chromium alloy pipe and tube	UNS N08825
ASTM B704	Welded nickel alloy tubes for heat exchanger	UNS N08825
ASTM B751	General requirements for nickel alloy tube	UNS N08825
EN 10216-5	Seamless stainless steel tubes for pressure purposes (nickel alloy section)	2.4858 (NiCr21Mo)
DIN 17751	Nickel alloy tubes	NiCr21Mo (2.4858)
ISO 6207	Nickel alloy seamless tubes	NiCr21Mo
NACE MR0175 / ISO 15156	Sour service compliance	Alloy 825
ASME Section II	Boiler and pressure vessel code	SB163 N08825

These standards ensure that Alloy 825 Heat Exchanger Tubes meet global requirements for chemical composition, mechanical performance, dimensional accuracy, hydrostatic testing, and non-destructive examination.

Commonly Used Heat Exchanger Tube Grades & Standards Produced by Womic Steel

Different specifications can be customized according to special requirements.

Execution Standard	Main Standard	Standard Grade
ASTM (USA)	ASTM B163, B423, B704, A213, A789	Alloy 825, Alloy 625, Alloy 600, Alloy 400, TP304/L, TP316/L, TP321/H, TP347/H, S31803, S32205, S32750
ASME (USA)	SB163, SB423, SA213, SA789	Alloy 825, Alloy 625, Alloy 600, TP304/L/H, TP316/L/H, S31803, S32205, S32750
EN / DIN (Europe)	EN 10216-5, EN 10217-7	2.4858 (Alloy 825), 2.4856 (Alloy 625), 1.4404, 1.4462, 1.4410
ISO (International)	ISO 6207, ISO 9329-4	NiCr21Mo (Alloy 825), NiCr22Mo9Nb (Alloy 625)

Chemical Composition of Alloy 825 Heat Exchanger Tube (UNS N08825)

Element

Ni

Cr

Fe

Mo

Cu

Ti

C

Mn

P

S

Si

Al

Alloy 825

38.0–46.0

19.5–23.5

≥22.0

2.5–3.5

1.5–3.0

0.6–1.2

≤0.05

≤1.0

≤0.03

≤0.5

≤0.2

Note: Alloy 825 (UNS N08825) is a nickel-iron-chromium alloy with controlled additions of molybdenum, copper, and titanium. Compared to stainless steel and duplex grades for heat exchanger service:

Property	TP316L	Duplex 2205	Super Duplex 2507	Alloy 825
Nickel (%)	10–14	4.5–6.5	6–8	38–46
Chromium (%)	16–18	22–23	24–26	19.5–23.5
Molybdenum (%)	2–3	3–3.5	3–5	2.5–3.5
Copper (%)	—	—	—	1.5–3.0
Sulfuric Acid Resistance	Poor	Good	Good	Excellent
Chloride SCC Resistance	Moderate	Excellent	Excellent	Outstanding
Sour Service (H₂S)	Limited	Good	Excellent	Excellent
Maximum Service Temp (°C)	400	300	300	540
Cost	Low	Medium	High	Very High

Comparison of Acid Resistance:

Acid Environment	TP316L	Duplex 2205	Alloy 825
Sulfuric Acid (H₂SO₄) – dilute	Poor	Fair	Excellent
Sulfuric Acid (H₂SO₄) – concentrated	Poor	Fair	Good
Phosphoric Acid (H₃PO₄)	Fair	Good	Excellent
Hydrochloric Acid (HCl)	Poor	Poor	Fair
Nitric Acid (HNO₃)	Good	Good	Excellent
Acetic Acid (CH₃COOH)	Good	Good	Excellent
Formic Acid (HCOOH)	Fair	Good	Excellent

Alloy 825 Heat Exchanger Tube Mechanical Properties and Heat Treatment Requirements

The Alloy 825 Heat Exchanger Tube offers excellent mechanical properties and high-temperature strength for demanding heat transfer applications.

Property	Unit	Alloy 825
Tensile Strength (min)	MPa	≥585
Yield Strength (0.2% offset, min)	MPa	≥240
Elongation (min)	%	≥30
Hardness (Brinell, typical)	HBW	≤200
Density	g/cm³	8.14
Melting Range	°C	1370–1400
Thermal Conductivity (20°C)	W/m·K	11.1
Thermal Conductivity (100°C)	W/m·K	12.1
Thermal Conductivity (500°C)	W/m·K	16.5
Coefficient of Thermal Expansion (20–100°C)	μm/m·K	14.0
Coefficient of Thermal Expansion (20–500°C)	μm/m·K	15.5
Specific Heat Capacity (20°C)	J/kg·K	440
Electrical Resistivity (20°C)	μΩ·m	1.12
Modulus of Elasticity (20°C)	GPa	195

High-Temperature Tensile Properties (Typical Values) :

Temperature (°C)	Tensile Strength (MPa)	Yield Strength (MPa)
20	620–750	280–380
100	600–720	260–350
200	580–700	250–340
300	560–680	240–330
400	540–650	230–320
500	500–600	220–300
540	460–550	200–270

Maximum Recommended Service Temperatures:

Service Type	Maximum Temperature
Continuous Service (Oxidizing Atmosphere)	540°C (1000°F)
Continuous Service (Reducing Atmosphere)	540°C (1000°F)
Sour Service (NACE MR0175)	232°C (450°F)
Seawater Service	50°C (122°F)
Minimum Service Temperature	-196°C (-321°F)

Heat Treatment Condition:

Alloy 825 Heat Exchanger Tubes are normally supplied in the annealed condition (solution annealed at 925–1040°C) followed by rapid cooling (water quenching or rapid air cooling). This heat treatment:

l Dissolves precipitated carbides and intermetallic phases.

l Relieves internal stresses from cold drawing or cold pilgering.

l Restores optimum corrosion resistance and ductility.

l Ensures titanium stabilization is effective.

Critical Note: Alloy 825 is titanium-stabilized, which prevents sensitization and intergranular corrosion after welding. Unlike stainless steels, Alloy 825 can be used in the as-welded condition without post-weld heat treatment for many corrosive environments. However, for maximum corrosion resistance in severe service, solution annealing after welding is recommended.

Delivery Condition:
Tubes are normally supplied in annealed and pickled condition, providing a clean, smooth surface and excellent corrosion resistance. Upon request, bright annealed (BA) finish can be provided for applications requiring ultra-clean internal surfaces.

Manufacturing Process of Alloy 825 Heat Exchanger Tube (Seamless)

Womic Steel adopts advanced production technology to ensure each Alloy 825 Heat Exchanger Tube meets exact specifications with flawless surface quality and precise dimensional accuracy.

1. Raw Material Selection: High-quality Alloy 825 (UNS N08825) nickel alloy billets from certified premium mills (Special Metals, VDM Metals, Outokumpu, Sandvik) with certified chemical composition (Ni, Cr, Mo, Cu, Ti verification) and traceability.

2. Heating and Piercing: Billets heated to a controlled temperature (higher than stainless steel due to nickel content) and pierced using a rotary piercing mill to form hollow shells.

3. Hot Rolling: Shells elongated and rolled to desired intermediate size with strict temperature control. Nickel alloys require careful reduction rates.

4. Cold Drawing / Cold Pilgering: Tubes refined to precise dimensions with improved surface finish. Multiple passes with intermediate annealing required due to high work hardening rate.

5. Solution Annealing: Heat treatment at 925–1040°C to dissolve carbides and restore properties. Performed in controlled atmosphere furnaces for bright annealed finish.

6. Pickling & Passivation: Removal of oxides using specialized pickling acids optimized for nickel alloys; thorough rinsing required.

7. Straightening and Dimensional Calibration: Ensures consistent roundness, straightness, and wall uniformity. Special attention to OD tolerance for tube sheet fitment.

8. Cutting and End Finishing: Tubes cut to precise lengths with square ends, deburred, and prepared for tube sheet insertion.

9. Final Inspection & Marking: Each tube tested, marked with grade, heat number, standard, and tube dimensions before packing.

This process guarantees a smooth internal bore, high structural integrity, precise dimensional accuracy, and exceptional corrosion resistance across all batches of Womic Steel’s Alloy 825 Heat Exchanger Tubes.

Manufacturing Process of Alloy 825 Heat Exchanger Tube (Welded)

Womic Steel utilizes state-of-the-art manufacturing technology to ensure every Welded Alloy 825 Heat Exchanger Tube meets precise specifications and delivers excellent surface quality and performance.

1. Raw Material Selection: High-quality Alloy 825 (UNS N08825) nickel alloy 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:

l Appropriate heat input control

l Shielding gas: Argon (or Ar + He for higher heat input)

l Matching filler metal: ERNiCrMo-3 (Alloy 625) or ERNiCrMo-10 (Alloy 22) for optimal weld properties

l Back purge with argon to protect weld root

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 925–1040°C followed by rapid cooling – essential for restoring corrosion resistance and relieving weld stresses.

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. Final Inspection & Marking: Complete dimensional check, visual inspection, and traceable marking.

This controlled process guarantees a sound weld seam, excellent dimensional accuracy, smooth internal surface, and superior corrosion resistance for every batch of Womic Steel’s Welded Alloy 825 Heat Exchanger Tubes.

Alloy 825 Heat Exchanger Tube Dimensions and Tolerances

1. Outside Diameter (OD) : 6.0mm – 114.3mm (1/4″ – 4″)

Common sizes: 9.53mm (3/8″), 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″)

2. Wall Thickness (WT) : 0.5mm – 5.0mm (BWG 10 – BWG 22)

Common BWG gauges: 10, 11, 12, 13, 14, 15, 16, 18

3. Length: Up to 30m (straight lengths); U-bent tubes available per customer drawing

4. OD Tolerances:

Standard: ±0.10mm

Precision: ±0.05mm (upon request)

5. Wall Thickness Tolerances:

Standard: ±10% of nominal

Precision: ±8% of nominal (upon request)

6. Straightness: 0.5mm per 1000mm length typical, tighter upon request

7. Surface Roughness (Internal) :

Standard: Ra ≤ 0.8μm

Bright Annealed: 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

Surface Conditions of Alloy 825 Heat Exchanger Tube

Womic Steel offers a range of surface finishes for Alloy 825 heat exchanger tubes, each suited to specific corrosive and high-temperature applications.

Surface Type	Description	Typical Applications
Annealed & Pickled (AP Finish)	Standard industrial finish – matte, oxide-free after acid treatment.	Most heat exchanger applications, acid service, sour service.
Bright Annealed (BA Finish)	Mirror-like surface obtained through controlled atmosphere annealing.	High-purity applications requiring ultra-clean surfaces.
Polished Finish (180#, 240#, 320#)	Smooth mechanical finish, reduced surface roughness.	Reduced fouling applications, food processing, pharmaceutical.
Passivated Finish	Surface chemically treated to enhance the protective passive film.	Critical corrosion service, high-purity systems.

Each Alloy 825 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.

Testing and Inspection of Alloy 825 Heat Exchanger Tube

Every Alloy 825 Heat Exchanger Tube undergoes comprehensive inspection in accordance with ASTM B163, EN 10216-5, and NACE standards:

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%
Pneumatic Pressure Test	Air pressure test under water for leak detection (optional).	Upon request
Eddy Current Test (ECT)	Detects surface and sub-surface imperfections.	100%
Ultrasonic Test (UT)	Ensures internal integrity of tube wall.	Upon request
Positive Material Identification (PMI)	Confirms correct chemical grade (Ni, Cr, Mo, Cu, Ti verification).	100% (per heat)
Intergranular Corrosion Test (IGC)	ASTM G28 – validates resistance to intergranular corrosion.	Per heat / batch
Flattening Test	Evaluates ductility and deformation capability.	Per heat / batch
Flaring Test	Evaluates ability to expand without cracking.	Per heat / batch
Hardness Testing	Brinell or Rockwell – confirms mechanical compliance.	Per heat / batch
Tensile Testing	Confirms ≥585 MPa UTS and ≥240 MPa yield strength.	Per heat / batch
High-Temperature Tensile Testing	Optional – verifies high-temperature strength.	Upon request
Sour Service Qualification	NACE MR0175/ISO 15156 compliance verification – HIC/SSC testing.	Per project
Corrosion Testing	ASTM G31 (immersion) – weight loss in specific acids.	Upon request
Surface Roughness Check (Ra)	For polished or BA tubes – profilometer measurement.	Upon request
Third-Party Inspection	SGS / BV / DNV / TUV / LR – witnessed testing.	Upon customer request

These extensive tests ensure that every Alloy 825 Heat Exchanger Tube from Womic Steel meets the highest international standards for reliability, corrosion resistance, and longevity in the most demanding heat transfer applications.

Applications of Alloy 825 Heat Exchanger Tube

Alloy 825 Heat Exchanger Tubes are specified for the most demanding applications where stainless steel grades (including super duplex) are insufficient:

Industry	Typical Applications
Chemical Processing	Sulfuric acid coolers and heaters, phosphoric acid evaporators, nitric acid heat exchangers, acetic acid reactors, formic acid processing, chlor-alkali heat exchangers.
Fertilizer Production	Phosphoric acid heat exchangers, sulfuric acid coolers, fertilizer slurry heaters, wet-process phosphoric acid evaporators.
Oil & Gas (Sour Service)	Sour gas coolers, H₂S-containing heat exchangers, produced water coolers, glycol reboilers, amine regenerator heat exchangers (NACE MR0175 compliant).
Offshore Platforms	Seawater coolers, topside heat exchangers, produced water treatment heat exchangers (ship classification certifications available from ABS, BV, DNV, LR, GL, RINA, CCS, KR, NK).
Hydrometallurgy	Pressure acid leaching (PAL) heat exchangers, solvent extraction heat exchangers, electrowinning solution coolers, copper and nickel processing heat exchangers.
Marine Engineering	Seawater-cooled condensers, ballast water heat exchangers, exhaust gas scrubber heat exchangers.
Power Generation	Flue gas desulfurization (FGD) heat exchangers, scrubber reheaters, condenser tubes (aggressive cooling water), nuclear power heat exchangers.
Pickling Plants	Acid recovery heat exchangers, spent acid heaters, rinse water heat recovery.
Pharmaceutical	High-purity heat exchangers for aggressive cleaning agents, chemical synthesis reactors.
Pulp & Paper	Bleach plant heat exchangers (chlorine dioxide), black liquor evaporators.
Waste Incineration	Flue gas heat exchangers, acid gas condensers, scrubber reheaters.

Alloy 825 Heat Exchanger Tube Packing, Delivery, and Womic Steel’s Transportation Advantage

Each Alloy 825 Heat Exchanger Tube is packed with the highest level of care due to the extreme value and critical nature of these products.

Packaging Options:

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 Alloy 825.	High-value tubes, BA finish, 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.

Standard Packaging Details:

1. End Protection: Plastic caps on both ends for all tubes

2. Moisture Protection: VCI paper and moisture barrier wrapping for sea freight

3. Padding: Foam padding between tube layers in crates

4. Labeling: Grade, heat number, standard, dimensions, PO number

5. Documentation: Packing list, material test reports (MTR), inspection certificates, NACE compliance certificates

Womic Steel’s Shipping and Delivery Strengths for Heat Exchanger Tubes:

1. Direct cooperation with global shipowners ensures the most competitive freight rates.

2. Professional loading and securing teams – special care for tube bundles to prevent bending, scratching, and end damage.

3. Efficient document preparation – EN 10204 3.1/3.2 certificates, MTR, PMI reports, IGC test reports, NACE certificates – minimizing customs delays.

4. Rapid delivery time – select sizes of Alloy 825 maintained in ready stock.

5. Continuous cargo tracking and after-sales follow-up to ensure smooth arrival at destination.

6. Custom length cutting available upon request – up to 30m straight lengths.

7. U-bend tube fabrication – custom bending per customer drawing with full heat treatment after bending.

Why Choose Womic Steel’s Alloy 825 Heat Exchanger Tube

Womic Steel is a trusted manufacturer and exporter specializing in nickel alloy heat exchanger tubes, committed to delivering premium quality and professional service for the world’s most demanding corrosive heat transfer applications.

1. Strict quality control under ISO 9001, PED 2014/68/EU, and ASME Boiler & Pressure Vessel Code certification.

2. Nickel alloy expertise – specialized knowledge in high-nickel alloy heat treatment, titanium stabilization, and sour service qualifications.

3. Modern production lines – cold pilger mills, TIG welded tube mills, bright annealing furnaces.

4. Complete in-house testing – including PMI, mechanical testing, IGC testing, and NACE sour service qualification support.

5. NACE MR0175 / ISO 15156 compliance – full documentation for sour service applications.

6. Exceptional acid resistance – outstanding performance in sulfuric, phosphoric, and nitric acid service.

7. Superior chloride SCC resistance – high nickel content provides outstanding resistance to SCC.

8. Flexible customization – special OD, WT, length, surface finish (BA, polished), U-bends.

9. Fast production cycle – seamless and welded tube manufacturing with competitive lead times.

10. Reliable global shipping – to all major ports (Houston, Rotterdam, Singapore, Shanghai, Dubai, etc.).

11. Direct mill relationships – competitive pricing for premium nickel alloy products.

12. Wide material range – from stainless steel to Duplex, Super Duplex, Alloy 825, Alloy 625, and Alloy 600.

Contact Womic Steel

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.