EN 10216-4 P255QL Seamless Steel Tube / Pipe

EN 10216-4 is the standard specification for seamless steel tubes for pressure purposes – Technical delivery conditions – Part 4: Non-alloy and alloy steel tubes with specified low temperature properties. P255QL, with a steel number of 1.0452, is one of the non-alloy quality steel grades designated by EN 10216-4. The EN 10216-4 P255QL seamless tubes are often used in services with a minimum temperature of -46°C.

en 10216-4 p255ql seamless tube 219.1x22.2
EN 1026-4 P255QL seamless pipes, O.D 219.1mm x 22.2mm(W.T). For a project in Liverpool, UK.
low temperature seamless pipes en 10216-4 76.1x17.5 p255ql
Low temperature seamless tubes EN 10216-4 O.D 76.1mm x 17.5mm Grade P255QL / 1.0452

Chemical composition of EN 10216-4 P255QL / 1.0452

ElementContent by mass, %
Carbon (C)≤0.17
Silicon (Si)≤0.35
Manganese (Mn)0.40~1.20
Phosphorous (P)≤0.025
Sulfur (S)≤0.020
Chromium (Cr)≤0.30
Nickel (Ni)≤0.30
Molybdenum (Mo)≤0.08
Aluminium (Al)≥0.020
Copper (Cu)≤0.30
Niobium (Nb)≤0.010
Titanium (Ti)≤0.040
Vanadium (V)≤0.02

Mechanical properties of EN 10216-4 P255QL / 1.0452

Steel NameSteel NumberYield Strength,
Tensile Strength,
Elongation A
Longitudinal, %
Elongation B
Transverse, %

Heat treatment conditions

For low-temperature purpose, EN 10216-4 P255QL shall be fully killed. The capital letter “P” stands for pressure purposes; “255” indicates the minimum yield strength of 255 MPa; “Q” indicates the heat treatment as quenching and tempering; “L” indicates the use for low-temperature purposes.

Usually the seamless tube or pipe of grade P255QL shall be quenched and tempered. The quenching temperature(hardening temperature) shall be at 890°C to 930°C while tempering temperature is ranging from 600°C to 680°C.

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