Carbon steel line pipe with a corrosion-resistant alloy layer — metallurgically clad or mechanically lined — in stainless steel, duplex or nickel alloy CRA grades.
- Standard: API 5LD, ASTM A263, ASTM A264
- Grades: 316L, Duplex 2205, Alloy 825, Alloy 625, 904L
- Certificate: EN 10204 3.1 with every order, 3.2 on request
Mejor Steel is the export agent for the mills that make your material: one contract, one delivery date, and the mill named on the quotation. How we supply
We reply within one business day, Monday to Friday 09:00-18:00 CST. Or write to info@mejorsteel.com / WhatsApp.
Specifications
| Outer diameter | On request |
|---|---|
| Wall thickness | Backing wall and CRA layer thickness per order |
| Length | On request |
| Ends | Beveled ends |
| Surface treatment | CRA cladding or mechanical lining |
| Manufacturing process | Hot roll bonded or mechanically lined |
| Pressure rating | Per API 5LD design |
CRA clad and lined pipe is carbon or low-alloy steel pipe with a corrosion-resistant alloy layer on the inside. The steel backing carries the pressure; the CRA layer — a stainless steel, duplex or nickel alloy — carries the corrosive fluid. It is the alternative to making the whole pipe from an expensive alloy, and it is the usual answer for sour or CO2-rich service where carbon steel alone would fail.
Clad or lined: the difference that decides the inspection
| CRA clad | CRA lined | |
|---|---|---|
| How the CRA layer is fixed | Metallurgically bonded to the backing by hot rolling or explosion bonding | Fitted mechanically, usually by thermal or hydraulic expansion into the backing |
| The interface | A metallurgical bond | A physical fit, not a bond |
| How it is checked | Ultrasonic bond testing on the cladding | Dimensional and pressure test; no bond test, because there is no bond |
| Where each is used | Higher pressure, higher temperature, or thermal cycling | Where cost is the driver and the service is less severe |
Backing and CRA layer combinations
The backing is usually carbon or low-alloy steel to API 5L or ASTM A106. The CRA layer is chosen against the CO2, H2S and chloride content of the produced or injected fluid, and the common grades are 316L, duplex 2205, Alloy 825, Alloy 625 and 904L. The combination is set by the corrosion study, not by habit — a backing that is strong enough is not a substitute for a CRA layer that is resistant enough.
Standards and what to name on the order
Clad and lined line pipe is supplied to API 5LD where the project calls for it. The bonding of the layer draws on ASTM A263 for stainless-clad plate and ASTM A264 for nickel-alloy-clad plate. State the backing grade and wall, the CRA grade and layer thickness, the outside diameter, and the test requirements.
Inspection and documents
- Ultrasonic bond testing on clad pipe; dimensional and hydrostatic test on both
- Mill test certificate to EN 10204 3.1 as standard, 3.2 on request with third-party witness (SGS, BV or TUV)
- Marking and sea-worthy export packing
What to state on the enquiry
- Backing standard and grade, outside diameter, backing wall and CRA layer thickness
- CRA grade, and whether clad or lined
- Length, quantity and destination port
- Test and certificate requirements, and whether a third party must witness
For the service conditions behind the grade choice, see NACE MR0175 in practice. Coatings such as 3PE and FBE are a different product — they are an external barrier, not an internal corrosion-resistant layer — and they are covered on the coated pipe page.
Download CRA Clad and Lined Pipe data sheet (PDF) One page: supply range, grades and key sizes, what to state on the enquiry, and the inspection documents that come with the order. The standard is the governing document.
Materials
- Carbon steel backing
- Low-alloy steel backing
- CRA layer: stainless steel, duplex, nickel alloy
Typical applications
- Sour service flowlines
- Offshore and subsea flowlines
- CO2 injection lines
- Produced water lines
- Oil and gas gathering lines
Inspection & testing
- Ultrasonic bond testing (clad)
- Dimensional and hydrostatic test
- NDT on backing and weld
- MTC EN 10204 3.1, 3.2 on request
| Packaging | Sea-worthy export packing. |
|---|---|
| MOQ | On request |
| Lead time | Made to order; confirmed on quotation |
Payment: T/T 30% deposit with the balance before shipment; L/C at sight also accepted. Final terms are confirmed on the quotation.
How we supply: sourced through partner mills; the producing mill is named on the quotation. How we supply sets out who is accountable for the order.
Need this product? Send the size, grade, quantity and destination port and we will reply with availability and pricing.
Request a quotation