P235GH and P355GH are European standard (EN 10028) normalized, fine-grain steels used for pressure vessels and boilers, differing primarily in strength: P235GH offers a minimum yield strength of 235 MPa (for thinner sections), while P355GH is stronger, with yield strength around 315-355 MPa, making it suitable for higher-pressure applications requiring better resistance at various temperatures. Both are carbon/low-alloy steels with good weldability and formability, but P355GH provides enhanced mechanical properties for demanding industrial uses.
Chemical Composition
|
P235GH Chemical Composition |
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|
Grade |
The Element Max (%) |
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|
C |
Si |
Mn |
P |
S |
Al(min) |
N |
|
|
P235GH |
0.16 |
0.35 |
0.60-1.20 |
0.025 |
0.015 |
0.020 |
0.012 |
|
Cr |
Cu |
Mo |
Nb |
Ni |
Ti |
V |
|
|
0.30 |
0.30 |
0.08 |
0.020 |
0.30 |
0.03 |
0.02 |
|
|
P355GH Chemical Composition |
|||||||
|
Grade |
The Element Max (%) |
||||||
|
C |
Si |
Mn |
P |
S |
Al(min) |
N |
|
|
P355GH |
0.10-0.22 |
0.60 |
1.10-1.70 |
0.025 |
0.015 |
0.020 |
0.012 |
|
Cr |
Cu |
Mo |
Nb |
Ni |
Ti |
V |
|
|
0.30 |
0.30 |
0.08 |
0.040 |
0.30 |
0.03 |
0.02 |
|
Mechanical Property
|
Grade |
|
P235GH Mechanical Property |
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|
Thickness |
Yield |
Tensilmie |
Elongation |
Impact Energy(KV J) min |
|||
|
P235GH |
mm |
Min Mpa |
Mpa |
Min % |
-20° |
0° |
+20° |
|
≤ 16 |
235 |
360-480 |
24 |
27 |
34 |
40 |
|
|
16> to ≤40 |
225 |
360-480 |
24 |
27 |
34 |
40 |
|
|
40> to ≤60 |
215 |
360-480 |
24 |
27 |
34 |
40 |
|
|
60> to ≤100 |
200 |
360-480 |
24 |
27 |
34 |
40 |
|
|
100> to ≤150 |
185 |
350-480 |
24 |
27 |
34 |
40 |
|
|
150> to ≤250 |
170 |
340-480 |
24 |
27 |
34 |
40 |
|
|
Grade |
|
P355GH Mechanical Property |
|||||
|
Thickness |
Yield |
Tensilmie |
Elongation |
Impact Energy(KV J) min |
|||
|
P355GH |
mm |
Min Mpa |
Mpa |
Min % |
-20° |
0° |
+20° |
|
≤ 16 |
355 |
510-650 |
20 |
27 |
34 |
40 |
|
|
16> to ≤40 |
345 |
510-650 |
20 |
27 |
34 |
40 |
|
|
40> to ≤60 |
335 |
510-650 |
20 |
27 |
34 |
40 |
|
|
60> to ≤100 |
315 |
490-630 |
20 |
27 |
34 |
40 |
|
|
100> to ≤150 |
295 |
480-630 |
20 |
27 |
34 |
40 |
|
|
150> to ≤250 |
280 |
470-630 |
20 |
27 |
34 |
40 |
|
Key Differences & Similarities
Strength: P355GH has higher yield and tensile strength than P235GH.
Application: Both are for pressure equipment, but P355GH handles greater stresses/temperatures.
Standard: Both fall under EN 10028 for boiler/pressure vessel steels.
Type: Both are normalized, fine-grain, mild structural steels.
P235GH Properties:
Yield Strength: Minimum 235 MPa,decreasing with thickness.
Tensile Strength: 350-480 MPa.
Use: General pressure vessel/boiler construction where moderate strength is sufficient.
P355GH Properties:
Yield Strength: Ranges from 315 to 355 MPa depending on thickness.
Tensile Strength: 510-650 MPa.
Use: Higher-pressure applications, demanding industrial uses, excellent low-temp performance.
