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High-pressure boiler seamless steel tubes are often under high temperatures and pressure when used. The tubes will be oxidized and corroded under the action of high-temperature flue gas and water vapor. It is required that the steel pipe has high durability, high resistance to oxidation and corrosion, and good structural stability. High-pressure boiler seamless tubes are mainly used to manufacture superheater tubes, reheater tubes, air ducts, and main steam tubes for high-pressure and ultra-high-pressure boilers.
Application:
①General boiler seamless pipes are mainly used to make water wall pipes, boiling water pipes, superheated steam pipes, superheated steam pipes for locomotive boilers, large and small smoke pipes and arched brick pipes.
②High-pressure boiler tubes are mainly used to manufacture superheater tubes, reheater tubes, air guide tubes, main steam tubes, etc. of high-pressure and ultra-high-pressure boilers.
EN 10216-1 P265 Seamless steel tubes will be manufactured by a seamless process. The forming operations and delivery conditions are shown in Table 1.
Table 1 — Forming operations and delivery conditions
| Forming operation | Quality | Delivery condition |
| Hot formed | TR1 | As formed or normalized or normalizing-formed |
| TR2 | Normalized or normalizing-formed | |
| Hot formed + cold finished | TR1 and TR2 | Normalized |
Chemical composition of EN 10216-1 P265
1. Chemical composition (cast analysis) a in % by mass for quality TR2
| Steel grade | Steel number | C max. | Si max. | Mn max. | P max. | S max. | Cr max. | Mo max | Ni max. |
| P265TR2 | 1.0259 | 0,20 | 0,40 | 1,40 | 0,025 | 0,015 | 0,30 | 0,08 | 0,30 |
| Al tot min. | Cu max | Nb max. | Ti max. | V max. | Cr+Cu+Mo+Ni max. |
| 0,02 | 0,30 | 0,010 | 0,04 | 0,02 | 0,70 |
2. Chemical composition (cast analysis) a in % by mass for quality TR1
| Steel grade | Steel number | C max. | Si max. | Mn max. | P max. | S max. | Cr max. | Mo max | Ni max. | Al tot min. |
| P265TR1 | 1.0258 | 0,20 | 0,40 | 1,40 | 0,025 | 0,020 | 0,30 | 0,08 | 0,30 | - |
| Al tot min. | Cu max | Nb max. | Ti max. | V max. | Cr+Cu+Mo+Ni max. |
| - | 0,30 | 0,010 | 0,04 | 0,02 | 0,70 |
Mechanical properties of EN 10216-1 P265
1. Mechanical properties for quality TR2
| Steel grade | Tensile properties | Impact properties | ||||||||
| Steel name | Steel number | Upper yield strength R eH b min. for Wall Thickness T mm | Tensile Strength R m | Elongation A min. % | Minimum average absorbed energy KV 2 J at a temperature of °C | |||||
| T ≤ 16 | 16 < T ≤ 40 | 40 < T ≤ 60 | l | t | ||||||
| MPa * | MPa * | MPa * | MPa * | l | t | 0 | -10 | 0 | ||
| P265TR2 | 1.0259 | 265 | 255 | 245 | 410 to 570 | 21 | 19 | 40 | 28 d | 27 |
Note: l = longitudinal t = transverse
2. Mechanical properties for quality TR1
| Steel grade | Tensile properties | Impact properties | ||||||||
| Steel name | Steel number | Upper yield strength R eH b min. for Wall Thickness T mm | Tensile Strength R m | Elongation A min. % b c | Minimum average absorbed energy KV 2 J at a temperature of °C c | |||||
| T ≤ 16 | 16 < T ≤ 40 | 40 < T ≤ 60 | l | t | ||||||
| MPa * | MPa * | MPa * | MPa * | l | t | 0 | -10 | 0 | ||
| P265TR1 | 1.0258 | 265 | 255 | 245 | 410 to 570 | 21 | 19 | - | - | - |
Note: l = longitudinal t = transverse
Tolerances of EN 10216-1 Seamless steel tubes
Tolerances on outside diameter and on wall thickness
| Outside diameter D mm | Tolerances on D | Tolerances on T for a T/D ratio | |||
| ≤ 0,025 | > 0,025 ≤ 0,050 | > 0,050 ≤ 0,10 | > 0,10 | ||
| D ≤ 219,1 | ± 1% or ± 0,5 mm whichever is the greater | ± 12,5 % or ± 0,4 mm whichever is the greater | |||
| D > 219,1 | ± 20 % | ± 15 % | ± 12,5 % | ± 10 % a | |
| a For outside diameters D ≥ 355,6 mm it is permitted to exceed the upper wall thickness locally by a further 5 % of the wall thickness T | |||||
Tolerances on exact lengths
| Length L | Tolerance on exact length |
| L ≤ 6 000 | + 10 0 |
| 6 000 < L ≤ 12 000 | +15 0 |
| L > 12 000 | +by agreement 0 |