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.
Chemical composition of EN 10216-4 P255QL / 1.0452
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Mechanical properties of EN 10216-4 P255QL / 1.0452
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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.