The specification EN 10028-3 covers a range of weldable fine grain steels supplied in the normalized condition and intended for pressure purposes. EN 10028-3 P275NH is steel for pressure purposes (P) with minimum yield strength of 275 MPa (275) which has specified elevated temperature properties which should bear a impact test at -20 centigrade degrees or above.
Dimensions for EN 10028-3 P275 NH steel manufactured types:
Hot Rolled Steel plates
Thickness: 3 – 120mm
width: 1500-4500mm
Certificates: 3.1/3.2 (width > 2750 mm : 3.1)
Forged plates
Thickness: 150 - 250 mm
width: 1500-2000mm
Certificates: 3.1
Forged bars
Thickness: 361 - 1000 mm
width: 1500-2000mm
Certificates: to be defined
The chemical composition for EN 10028-3 P275 NH steel (Heat Analysis Max%) is as following:
The Chemical element Composition of P275NH |
|||||||
The Element Max (%) |
|||||||
C |
Si |
Mn |
P |
S |
Al(min) |
N |
|
0.16 |
0.40 |
0.5-1.40 |
0.030 |
0.020 |
|
0.02 |
|
Cr |
Cu |
Mo |
Nb |
Ni |
Ti |
V |
|
0.30 |
0.30 |
0.08 |
0.005 |
0.50 |
0.03 |
0.05 |
|
Carbon Equivalent: Ceq = 【C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15】%
The mechanical property for EN 10028-3 P275 NH steel:
Grade |
|
||||||
Thickness |
Yield strength |
Tensile strength |
Elongation |
Impact Energy(KV J) min |
|||
mm |
Min Mpa |
Mpa |
Min % |
-20° |
0° |
+20° |
|
≤ 16 |
275 |
390-510 |
24 |
47 |
55 |
63 |
|
16> to ≤35 |
275 |
390-510 |
24 |
47 |
55 |
63 |
|
35> to ≤50 |
265 |
390-510 |
24 |
47 |
55 |
63 |
|
50> to ≤70 |
255 |
390-510 |
24 |
47 |
55 |
63 |
|
70> to ≤100 |
235 |
370-490 |
23 |
47 |
55 |
63 |
|
100> to ≤150 |
235 |
350-470 |
23 |
47 |
55 |
63 |
|
EN 10028-3 P275NH boiler steel plate are mainly used to build pressure vessels and boilers and liquid tanks. The heat treatment for Normalized have to be done for steel plates after production. Boiler steel plate P275NH shall be done with low temperature impacting at minus 20 centi degree. In order to guarantee the usage safety of pressure vessel steel plates, boiler steel plates P275NH would accept ultrasonic examination after rolling.
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