ASTM A671 CE70 EFW pipe is intended for low-temperature service where nickel alloy steel is required. Amardeep Steel supplies enquiries specified as CE70 to the current A671 grade CFE70, manufactured from ASTM A203 Grade E plate containing 3.5% nickel. For detailed grade information, see our ASTM A671 CFE70 pipes. Projects requiring 2.25% nickel can also consider our ASTM A671 CFB70 pipes. The complete ASTM A671 EFW pipe range covers additional grades for different service conditions. Every order includes plate and weld certificates, specified temperature impact test results, and radiography reports.
What Is ASTM A671 CE70 EFW Pipe?
ASTM A671 covers electric fusion welded steel pipe for atmospheric and lower temperatures. Its nickel steel grades are made from ASTM A203 plate. Nickel lowers the temperature at which steel turns brittle, so these grades are used where carbon steel pipe would not have enough toughness.
How CE70 Orders Are Supplied
The current A671 grade table lists the nickel steel grades as CFA65, CFB70, CFD65 and CFE70. CE70 does not appear in it. Buyers who ask for CE70 at 70 ksi almost always need CFE70, the 3.5% nickel grade, so the mill certificate for a CE70 order will show CFE70 unless your specification states otherwise.
ASTM A671 CE70 EFW Pipe Specifications
Parameter | Details |
|---|---|
Specification | ASTM A671 / ASME SA671 |
Grade | CE70, supplied to current A671 grade CFE70 |
Plate Material | ASTM A203 / A203M Grade E (3.5% nickel) |
Manufacturing Process | Electric fusion welded (EFW) with filler metal, longitudinal seam |
Size Range | 16 inch (406 mm) OD and larger as standard, smaller sizes on request |
Wall Thickness | Up to 75 mm (3 inch) |
Common Classes | Class 22 and Class 32, with impact testing to the project specification |
Length | Single random, double random and cut lengths |
Ends | Bevelled end or plain end |
Test Certificate | EN 10204 3.1, with 3.2 available on request |
ASTM A671 CE70 EFW Pipe Chemical Composition
Element (%), plate up to 50 mm | A203 Gr E (CFE70) |
|---|---|
Carbon (C) | 0.20 max |
Manganese (Mn) | 0.70 max |
Phosphorus (P) | 0.025 max |
Sulfur (S) | 0.025 max |
Silicon (Si) | 0.15 to 0.40 |
Nickel (Ni) | 3.25 to 3.75 |
ASTM A671 CE70 EFW Pipe Mechanical Properties
Property | Requirement |
|---|---|
Tensile Strength | 485 to 620 MPa (70 to 90 ksi) |
Yield Strength, min | 275 MPa (40 ksi) |
Elongation in 50 mm, min | 21% |
Impact Testing and Service Temperature
3.5% nickel steel such as A203 Grade E is commonly selected for service down to about minus 100 degrees Celsius. The impact test temperature and energy are set by the purchaser and the governing code.
A671 Pipe Classes Explained
Class (first digit) | Heat Treatment on Pipe | Class (second digit) | Weld Radiography and Pressure Test |
|---|---|---|---|
1x | None | x0 | Neither |
2x | Stress relieved | x1 | Radiography only |
3x | Normalized | x2 | Radiography and pressure test |
4x | Normalized and tempered | x3 | Pressure test only |
5x | Quenched and tempered |
Classes ending in 2 include full radiography and a hydrostatic test. Nickel steel pipe is normally ordered stress relieved (Class 22) or normalized (Class 32).
ASTM A671 Nickel Steel Grades Compared
Property | CFA65 | CFB70 | CFD65 | CFE70 |
|---|---|---|---|---|
A203 Plate Grade | A | B | D | E |
Nickel | 2.10 to 2.50% | 2.10 to 2.50% | 3.25 to 3.75% | 3.25 to 3.75% |
Tensile Strength | 450 to 585 MPa | 485 to 620 MPa | 450 to 585 MPa | 485 to 620 MPa |
Yield Strength, min | 255 MPa | 275 MPa | 255 MPa | 275 MPa |
For cryogenic service, 9% nickel grades are used; see our ASTM A333 Grade 8 pipes.
Heat Treatment of ASTM A671 CE70 EFW Pipe
- Post weld heat treatment: 590 to 635 degrees Celsius (1100 to 1175 degrees Fahrenheit)
- Normalizing: 950 degrees Celsius (1750 degrees Fahrenheit) maximum
Applications of ASTM A671 CE70 EFW Pipe
- Ethane and cold gas processing lines
- Propylene and ethylene plant refrigeration loops
- Liquid carbon dioxide and ammonia service
- Cold flare and blowdown headers
Testing and Documentation
Every order of A671 CE70 pipe goes through the checks below at our testing facility or approved third party labs.
- Chemical analysis of plate and deposited weld metal
- Transverse tension test
- Transverse guided weld bend test
- Charpy impact test of plate, weld and heat affected zone at the specified temperature
- Radiography of the weld seam (Class x1 and x2)
- Hydrostatic test (Class x2 and x3)
- Visual and dimensional inspection
Mill test certificates are issued to EN 10204 3.1, with 3.2 available on request. You can view our approvals on the certificates page.
Packing and Marking
Each length is marked with the specification, grade, class, size, heat number and manufacturer name. Bevelled ends are protected with caps or bevel protectors, and lengths are shipped loose with dunnage or in lashed bundles. Read more about our packing and despatch process.
Request a Quote for ASTM A671 CE70 EFW Pipe
Send us the OD, wall thickness, nickel grade, class, impact test temperature, length and quantity, and our team will reply with price and delivery. Use the enquiry form or reach us through the contact page.
Frequently Asked Questions
What is ASTM A671 CE70 pipe?
ASTM A671 CE70 is the name buyers use for 70 ksi 3.5% nickel steel EFW pipe for low temperature service. It is supplied to the current A671 grade CFE70, made from ASTM A203 Grade E plate.
Is CE70 listed in the current ASTM A671 grade table?
No. The current table lists CFA65, CFB70, CFD65 and CFE70. CE70 orders are supplied as CFE70, the 70 ksi 3.5% nickel grade.
What is the minimum temperature for A671 CE70 pipe?
3.5% nickel steel is commonly selected for service down to about minus 100 degrees Celsius, with the actual impact test temperature set by the project specification.
What is the tensile strength of A671 CE70 pipe?
The tensile strength is 485 to 620 MPa (70 to 90 ksi) and the minimum yield strength is 275 MPa (40 ksi).
