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Gangsteel – China's Leading Mill-Direct Supplier & Exporter of S355M Chemical Composition EN 10025-4 Steel Plates
Gangsteel is the professional supplier you can trust for S355M chemical composition EN 10025-4 steel plates, with the largest permanent stock in Asia – over 4,000 tons always ready in thickness 6–200 mm, width 1500–4200 mm, length up to 18 meters. All plates are genuine TMCP (thermomechanical controlled process) produced by top Chinese mills (HBIS, Shougang, Nanjing Steel) with full European approvals (PED 2014/68/EU, CPR 305/2011).
We supply with original EN 10204-3.1/3.2 certificates that include complete chemical composition for every heat number, plus third-party inspection (DNV-GL, ABS, LR, BV, CCS, KR, TÜV, SGS). Z25/Z35 through-thickness quality in stock, 100 % ultrasonic testing EN 10160 S2/E2 standard.
Immediate delivery worldwide in 3–7 days. Full processing services: plasma/oxy cutting, beveling, drilling, rolling, priming.
Explore our complete en 10025 4 High Strength Structural Steel series for all grades.
S355M is a thermomechanically rolled (TMCP) weldable fine-grain structural steel specified in EN 10025-4:2004 (current version 2019).
The chemical composition of S355M is carefully controlled to deliver:
The low carbon and tightly controlled alloying elements, combined with the TMCP process, are what make S355M one of the most weldable and reliable high-strength structural steels available.
The table below shows both ladle analysis (maximum values from the melt) and product analysis (permitted deviations on the finished plate) as per EN 10025-4 and EN 10025-1 Table 4.
|
Element |
Ladle Max (%) |
Product Deviation (%) |
Typical Actual (%) – Gangsteel Stock |
Role in S355M Performance |
|---|---|---|---|---|
|
C |
0.14 |
+0.02 |
0.09–0.12 |
Low carbon = excellent weldability & HAZ toughness |
|
Si |
0.50 |
+0.05 |
0.20–0.40 |
Deoxidizer; minor strength contribution |
|
Mn |
1.60 |
+0.10 |
1.20–1.50 |
Primary strength element |
|
P |
0.025 |
+0.005 |
≤0.018 |
Very low for toughness and ductility |
|
S |
0.020 |
+0.005 |
≤0.015 |
Low inclusions = better impact values |
|
Nb |
0.05 |
+0.01 |
0.02–0.04 |
Main grain refiner (NbC pinning) |
|
V |
0.10 |
+0.02 |
0.04–0.08 |
Precipitation strengthening |
|
Al min |
0.020 |
+0.030 (total) |
0.025–0.045 |
Strong deoxidizer & grain refiner |
|
Ti |
0.05 |
+0.03 |
0.01–0.03 |
TiN particles pin austenite grains |
|
Cr |
0.30 |
+0.05 |
0.10–0.25 |
Controlled for balanced hardenability |
|
Ni |
0.50 |
+0.05 |
0.20–0.40 |
Improves low-temp toughness |
|
Mo |
0.10 |
+0.03 |
≤0.05 |
Minor HAZ improvement |
|
Cu |
0.55 |
+0.03 |
0.20–0.35 |
Deoxidizer |
|
N |
0.015 |
+0.003 |
≤0.012 |
Low for clean steel matrix |
|
CEV max |
0.39 |
N/A |
0.34–0.37 |
Excellent weldability – no preheat up to 80 mm |
CEV formula: C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
Typical Gangsteel actual CEV = 0.34–0.37 → one of the lowest in the market, giving outstanding welding performance.
Full chemical data sheet: S355M Chemical Composition EN 10025-4 Supplier
|
Thickness (mm) |
ReH min (MPa) |
Rm (MPa) |
A5 min (%) |
KV min (J) at –20 °C longitudinal |
|---|---|---|---|---|
|
≤ 16 |
355 |
470–630 |
22 |
40 |
|
>16 ≤ 40 |
345 |
470–630 |
22 |
40 |
|
>40 ≤ 63 |
335 |
470–630 |
22 |
40 |
|
>63 ≤ 80 |
325 |
470–630 |
22 |
40 |
|
>80 ≤ 100 |
315 |
470–630 |
22 |
40 |
|
>100 ≤ 120 |
305 |
450–610 |
22 |
40 |
|
>120 ≤ 150 |
295 |
450–610 |
22 |
40 |
|
>150 ≤ 200 |
285–295* |
450–610 |
22 |
40 |
*Gangsteel guarantees 295 MPa up to 180 mm, 285 MPa to 200 mm.
Hardness: 140–180 HBW Density: 7.85 g/cm³
Full mechanical tables: S355M Mechanical Properties EN 10025-4 Plate Supplier
S355M is widely used when the service temperature is above –20 °C:
When the temperature drops below –20 °C, the low-temperature version S355ML is required.
Q1: What is the typical CEV of your S355M plates?
A: Our actual CEV is 0.34–0.37, significantly lower than the maximum 0.39 allowed by the standard. This gives outstanding weldability – no preheating required up to 80 mm thickness in most conditions.
Q2: Why is the carbon content so low in S355M?
A: Low carbon (0.09–0.12 % actual) is essential for the TMCP process and excellent HAZ toughness after welding. It also contributes to the very low CEV and high impact values.
Q3: How do you control P and S levels?
A: We use vacuum degassing (VD) and strict raw material selection to keep P+S ≤0.030 % (often ≤0.025 %). This ensures clean steel with minimal inclusions and maximum toughness.
Q4: Can you supply S355M with even tighter chemistry?
A: Yes – for special offshore or pressure vessel applications, we can offer P+S ≤0.020 %, C ≤0.10 %, or other restrictions by agreement.
Q5: Do you provide chemical composition certificates?
A: Every plate is supplied with EN 10204-3.1 or 3.2 certificate showing complete ladle and product analysis for the specific heat number.
Q6: What is the difference between S355M and S355ML chemistry?
A: The chemical composition is exactly the same. The only difference is the impact test temperature (S355M –20 °C, S355ML –50 °C).
Q7: How fast can you deliver with full chemical certificates?
A: From ready stock: 3–7 days worldwide, including all certificates and third-party inspection reports.
Need S355M plates with verified chemical composition? Contact us now for best price and fastest delivery.
Email: admin@gangsteel.com WhatsApp/WeChat/Mobile: +86 135 9887 9167 Website: https://gangsteel.net/
Gangsteel – Real Factory. Real Stock. Real Chemical Control.
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