Clad steel pipe is a high-performance piping solution composed of two or more metallic layers bonded metallurgically or mechanically. Typically, a carbon or low-alloy steel base pipe provides structural strength, while a corrosion-resistant cladding layer (e.g., stainless steel, nickel alloys, titanium, copper) ensures long-term durability in aggressive environments. Widely used in oil & gas, chemical, offshore, power, pharmaceutical, and environmental industries, clad pipes offer an optimal balance of strength, corrosion resistance, and cost-efficiency-making them a superior alternative to solid alloy pipes. We offer explosion-bonded, hot-rolled, weld-overlay, and mechanically lined composite pipes, ensuring robust interfacial bonding, stable performance, and extended service life.
Key Features
Standards:
Chinese Standards:
GB/T 20568-2006 (Steel Composite Pipes)
SY/T 6623-2017 (CRA Clad/Lined Pipes for Oil & Gas)
NB/T 47002.2-2019 (Explosion-Welded Composite Pipes)
International Standards:
API 5LD, API 5LC (CRA Clad Steel Pipes)
ASTM A789/A789M, A814/A814M (Stainless Steel Tubing)
ISO 15156 / NACE MR0175 (Materials for H₂S Environments)
EN 10216-5 (Seamless Stainless Steel Tubes for Pressure Purposes)
JIS G 3446 (Stainless Steel Mechanical Tubing)
Material Combinations:
Common Cladding/Base Pairs:
316L / Q355B: Chloride-containing, weak acid environments
2205 Duplex / L360N: High H₂S, chloride stress corrosion resistance
Incoloy 825 / X60: Strong acids (H₂SO₄, H₃PO₄)
Inconel 625 / X70: High-temp, corrosive downhole tubing
Hastelloy C-276 / Q345R: Oxidizing acids, wet chlorine
TA2 Titanium / 20# Steel: Seawater cooling, desalination
Cladding Thickness: 1.6–6.0mm (10–25% of wall thickness)
Base Thickness: Designed per ASME B31.3 or GB 50316 pressure requirements
Bonding Methods:
Explosion-bonded: High bond strength (≥200MPa), for high-pressure systems
Hot-rolled: Continuous, high dimensional accuracy
Weld-overlay: Internal multi-pass welding, for large-diameter pipes
Mechanically lined: Cladding tube expanded into base pipe
Dimensions:
OD: Φ21.3–1219mm (NPS 1/2" – 48")
WT: 3.0–50mm (total)
Length: 6m, 9m, 12m (seamless); up to 18m or coiled (welded)
Ends: Plain End (PE), Beveled End (BE), Threaded (e.g., API 5CT)
Tolerances: API 5LD, GB/T 20568, or customer-specific
Applications:
Oil & Gas: Flowlines, injection lines, risers, spools
Chemical/Petrochemical: Reactor piping, heat exchanger tubes
Power: FGD slurry lines, condensate return
Offshore: Seawater systems, desalination plants
Pharma/Food: Sanitary fluid transfer (Ra ≤0.8μm)
Environmental: Leachate, corrosive wastewater
Nuclear: Secondary loops, chemical dosing
Certifications & Approvals:
Classification Society Certifications: CCS, ABS, DNV, LR, BV, NK
Provide: Type Approval, MTC 3.1/3.2, Bond Strength Test, UT Report, Hydrotest Report, CoC
Owner & Engineering Company Approvals:
ISO 9001, ISO 14001, ISO 45001
PED 2014/68/EU, NORSOK M-650
API 5LD / 5LC, AD 2000-Merkblatt W0
Approved by CNPC, Sinopec, CNOOC, Shell, ExxonMobil, Total, Chevron, BP, BASF, DuPont, Siemens, Honeywell, Saudi Aramco
Common Customer Questions (Q&A Format)
Q: What are the advantages of clad pipe vs. solid alloy pipe?
A: Clad pipe costs 30–60% less than solid alloy pipe while offering similar corrosion resistance-ideal for large-diameter, long-distance pipelines.
Q: Explosion-bonded vs. weld-overlay-better for high pressure?
A: Explosion-bonded has higher bond strength (≥200MPa), ideal for high-pressure systems; weld-overlay is cost-effective for large-diameter pipes.
Q: Can cladding thickness be customized? How is minimum thickness ensured?
A: Yes, customizable per corrosion rate. We ensure minimum cladding via ultrasonic thickness testing and batch inspection reports.
Q: Are clad pipes weldable?
A: Yes. Use matching filler (e.g., ER309L, ERNiCrMo-3), with transition layer welding to prevent dilution.
Q: Do you provide NDT? What tests are performed?
A: Yes, 100% UT for bond quality, PT/MT for surface defects, with full NDT reports.
Q: Suitable for H₂S-containing sour service?
A: Yes, we supply NACE MR0175/ISO 15156-compliant pipes (e.g., 316L, 2205, 825) for sour oil & gas fields.
Q: How to prevent cladding damage during transport/installation?
A: Use soft slings, avoid direct steel contact; pad during storage; use dedicated tools during installation.
Q: Do you supply fittings (bends, tees)?
A: Yes, we offer clad bends, tees, flanges for complete system integrity.
Q: What is the lead time?
A: Standard: 30–60 days; Custom: 60–90 days, depending on complexity and material sourcing.
Q: Suitable for high/low-temperature service?
A: Yes, we provide high-temp strength data (e.g., 500°C creep) or low-temp impact tests (-40°C).
Q: What is the internal surface roughness? Suitable for clean fluids?
A: Ra 0.8–3.2μm; 316L cladding meets GMP/FDA for pharma/food applications.
Q: Do you offer installation support?
A: Yes, we provide PQRs, installation guidelines, on-site welding supervision, and technical training.
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