P355N and P460N are normalized, fine-grain steel grades under the EN 10028-3 standard, primarily for boilers, pressure vessels, and pipes transporting hot liquids, with P460N offering higher strength (460 MPa minimum yield) than P355N (355 MPa minimum yield). They are characterized by good weldability and mechanical properties, used in demanding industrial applications like chemical processing and power plants.
Chemical Composition
|
P355N Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Al(min) |
N |
|
|
P355N |
0.20 |
0.50 |
0.9-1.70 |
0.03 |
0.025 |
|
0.02 |
|
Cr |
Cu |
Mo |
Nb |
Ni |
Ti |
V |
|
|
0.30 |
0.30 |
0.08 |
0.005 |
0.50 |
0.03 |
0.10 |
|
|
P460N Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Al(min) |
N |
|
|
P460N |
0.20 |
0.60 |
1.0-1.70 |
0.030 |
0.025 |
|
0.025 |
|
Cr |
Cu |
Mo |
Nb |
Ni |
Ti |
V |
|
|
0.30 |
0.70 |
0.10 |
0.005 |
0.80 |
0.03 |
0.20 |
|
Mechanical Property
|
Grade |
|
P355N Mechanical Property |
|||||
|
Thickness |
Yield |
Tensilmie |
Elongation |
Impact Energy(KV J) min |
|||
|
P355N |
mm |
Min Mpa |
Mpa |
Min % |
-20° |
0° |
+20° |
|
≤ 16 |
355 |
490-630 |
22 |
40 |
47 |
55 |
|
|
16> to ≤35 |
355 |
490-630 |
22 |
40 |
47 |
55 |
|
|
35> to ≤50 |
345 |
490-630 |
22 |
40 |
47 |
55 |
|
|
50> to ≤70 |
325 |
490-630 |
22 |
40 |
47 |
55 |
|
|
70> to ≤100 |
315 |
470-610 |
21 |
40 |
47 |
55 |
|
|
100> to ≤150 |
295 |
450-590 |
21 |
40 |
47 |
55 |
|
|
Grade |
|
P460N Mechanical Property |
|||||
|
Thickness |
Yield |
Tensilmie |
Elongation |
Impact Energy(KV J) min |
|||
|
P460N |
mm |
Min Mpa |
Mpa |
Min % |
-20° |
0° |
+20° |
|
≤ 16 |
460 |
570-720 |
17 |
40 |
47 |
55 |
|
|
16> to ≤35 |
450 |
570-720 |
17 |
40 |
47 |
55 |
|
|
35> to ≤50 |
440 |
570-720 |
17 |
40 |
47 |
55 |
|
|
50> to ≤70 |
420 |
570-720 |
17 |
40 |
47 |
55 |
|
|
70> to ≤100 |
400 |
540-710 |
16 |
40 |
47 |
55 |
|
|
100> to ≤150 |
380 |
520-690 |
16 |
40 |
47 |
55 |
|
Key Characteristics
Standard: EN 10028-3 (for pressure vessels) or related EN standards like EN 10216-3 (tubes).
Type: Non-alloy or alloy steel, fine-grain, normalized.
Applications: Boilers, pressure vessels, heat exchangers, reactors, and pipelines for hot media.
Performance: High yield strength, good weldability, suitable for elevated temperatures.
P355N
Strength: Minimum yield strength of 355 MPa (N/mm²).
Use: General purpose for pressure equipment.
P460N
Strength: Higher minimum yield strength of 460 MPa (N/mm²).
Use: High-yield applications, demanding structural parts in power and chemical industries.
