What is the difference between S355J2 and S355K2 steel plates

S355J2 and S355K2 steel plates are under same standard, EN10025-2. EN S355 steel offers high yield (minimum yield strength of 355 N/mm²) and tensile strength. It is a structural grade steel which is widely used in engineering and construction industries. EN S355 steel can be supplied with a variety of treatments and test options to ensure that it is a highly usable steel in your various projects.

S355J2 and S355K2 steel plates have same chemical composition and strength as below:
S355J2 and S355K2 steel plates chemical composition:

Thickness (mm)	C	Mn	Si	P	S	N	Cu
under 40	0.2	1.6	0.55	0.025	0.025	-	0.55
>40	0.22

S355J2 and S355K2 steel plates chemical composition:

ReH Minimum Yield strength (MPa )

R m (MPa)

for nominal thickness(mm)

for nominal thickness (mm)

<16

=>16

>40

>63

>80

>100

>150

>200

>250

=>3

>100

>150

>250

≤ 40

≤63

≤ 80

≤100

≤150

≤200

≤250

≤400

≤ 100

≤150

≤250

≤400

355

345

335

325

315

295

285

275

265

510-680

470-630

450-600

However, what is the difference between S355J2 and S355K2 steel plates? It mainly lies in their impact test:
J2 symbol Charpy V-Notch Impact Tested Longitudinal 27 Joules at -20 ˚C under 150mm thickness.
K2 symbol Charpy V-Notch Impact Tested Longitudinal 40 Joules at -20 ˚C max 100mm thickness.

S355K2 steel plates Charpy V-Notch Impact Tested Longitudinal 40 Joules at -20 ˚C, S355J2 steel plates Charpy V-Notch Impact Tested Longitudinal 27 Joules at -20 ˚C under 150mm thickness. S355K2 steel plates are good in highly impact under low temperature condition projects.

For more information about difference between S355J2 and S355K2 steel plates, or even S355J0 and S355JR plates, welcome to consult us.

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