What is the difference between S275J0 and S275JR steel

S275J0 and S275JR steel are not the same material, but the same series of S275 carbon structural steels. S275J0 and S275JR steel have different chemical elements. The biggest difference is that the impact temperature of S275J0 and S275JR is different. The impact temperature of S275J0 steel is 0℃, and the impact temperature of S275JR is 20℃, S means a structural steel; 275 means the yield strength is 275MPa; J0 refers to the impact energy test temperature of 0 degrees Celsius, and JR refers to the impact energy test temperature of 20 degrees Celsius.
S275JR steel chemical elements, melting analysis:

C	Mn	P	S	N	Ceq Max
≤0.22	≤1.5	≤0.03	≤0.03	≤0.012	≤0.42

Composition Note: When Alt≥0.02% or other sufficient nitrogen-fixing elements are used, the maximum value of N does not apply. Ceq = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
S275J0 steel chemical composition, finished product analysis:

C	Mn	P	S	Cu	N	Ceq Max
≤0.18	≤1.5	≤0.03	≤0.025	≤0.55	≤0.012	≤0.42

Composition Note: When Alt≥0.02 or Als≥0.015 or other sufficient nitrogen-fixing elements are used, the maximum value of N does not apply. Ceq = C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15
Mechanical properties of S275JR steel:
Yield strength ReH(MPa)≥255
Tensile strength Rm (MPa) 410-580
Elongation A(%): ≥19
Shock temperature 20°C
Impact energy Akv(J): ≥27

S275J0 steel mechanical properties:
Yield strength ReH(MPa)≥255
Tensile strength Rm (MPa): 410-560
Elongation A(%): ≥20
Shock temperature 0°C
Impact energy Akv(J): ≥27