Difference between S235JR and S355JR steel plate

Dec 17, 2025 Leave a message

The main difference between S235JR and S355JR steel plates is strength: S355JR offers significantly higher yield strength (355 MPa minimum) and tensile strength than S235JR (235 MPa minimum), making it suitable for heavy-duty, high-load applications like large bridges and machinery, while S235JR is more economical for general, lighter construction, though both offer good weldability, with S235 being easier to cold-form.

Chemical Composition of S235JR

C max	Mn max	P max	S max	N max	Cu max	CEV max
0.2	1.4	0.04	0.04	0.012	0.55	0.38

Chemical Composition Of S355JR

С	Si	Mn	P	S	N	Cu
≤ 0,24	≤ 0.55	≤ 1.60	≤ 0.035	≤ 0.035	≤ 0.012	≤ 0.55

Mechanical Properties of S235JR

Nominal thickness (mm):	to 3	3 – 100	100 – 150	150 – 250
Rm - Tensile strength (MPa) Flat and long products	360-510	360-510	350-500	340-490

Nominal thickness (mm):	to 16	16–40	40–63	63–80	80–100	100–150	150–200	200–250
ReH - Minimum yield strength (MPa) Flat and long products	235	225	215	215	215	195	185	175

KV - Impact energy (J) longitud.,	-20°	0°	+20°
KV - Impact energy (J) longitud.,	27	27	27

Nominal thickness (mm):	to 1		1.5 – 2	2 – 2.5	2.5 – 3
A - Min. elongation Lo = 80 mm (%) parallel,	17	18	19	20	21

Nominal thickness (mm):	Mar-40	40 – 63	63 – 100	100 – 150	150 – 250
A - Min. elongation Lo = 5,65 √ So (%) parallel,	26	25	24	22	21

Mechanical properties of S355JR

Nominal thickness, mm	Minimum yield strength, MPa	Strength limit, MPa
<3	355	510-680
≥3 ≤ 16	355	470-630
> 16 ≤ 40	345	470-630
> 40 ≤ 63	335	470-630
> 63 ≤ 80	325	470-630
> 80 ≤ 100	315	470-630
> 100 ≤ 150	295	450-600
> 150 ≤ 200	285	450-600
> 200 ≤ 250	275	450-600
> 250 ≤ 400	265	450-600

Choose S235JR for general, budget-friendly tasks and S355JR for demanding, high-strength projects where performance justifies the higher cost and more complex fabrication.