The Difference between Q345 Series and E355

Q345 SERIES （ Q345 A ,Q345 B ,Q345 C,Q345 D & Q345E）

Q345 steel is a Chinese standard low alloy high strength structural steel. The material has a minimum yield strength of 345 MPa (50 ksi), and tensile strength of 470-630 Mpa (68-91 ksi). It has better properties than Q235. According to GB/T 1591 – 2008, Q345 material has 5 quality grades: Q345A, Q345B, Q345C, Q345D and Q345E.

MEANING &DESIGNATION

• “Q” is short for Pinyin: “Qu”, which means Yield strength;
• “345” indicates the steel has a minimum value of yield strength 345 MPa for steel diameter/thickness ≤16mm.
• A, B, C, D and E indicate the quality grade.
• Q345 can be divided into Q345A, Q345B, Q345C, Q345D and Q345E by grade. What they represent is that the impact temperature is different. Q345A, no impact; Q345B, impact at 20 ° normal temperature; Q345C, 0 degree impact; Q345D, is – 20 degree impact; Q345E, is – 40 degree impact. At different impact temperature, the impact value is different.

CHEMICAL COMPOSITION of Q345

Steel Grade	C	Si	Mn	P	S	V	Al
Q345 A	≤0.20	≤0.55	≤1.70	≤0.045	≤0.045	0.02-0.15
Q345 B	≤0.20	≤0.55	≤1.70	≤0.040	≤0.040	0.02-0.15
Q345 C	≤0.20	≤0.55	≤1.70	≤0.035	≤0.035	0.02-0.15	≥0.015
Q345 D	≤0.20	≤0.55	≤1.70	≤0.030	≤0.030	0.02-0.15	≥0.015
Q345 E	≤0.20	≤0.55	≤1.70	≤0.025	≤0.025	0.02-0.15	≥0.015

Q345 MECHANICAL PROPERTIES

Steel Grade	Tensile Strength	Yield Strength	Elongation	Impact Energy (℃/J）
Q345 A	490-675	≥345	≥21
Q345 B	490-675	≥345	≥21	20 ℃    27 J
Q345 C	490-675	≥345	≥22	0 ℃
Q 345D	490-675	≥345	≥22	-20 ℃   27 J
Q345 E	490-675	≥345	≥22	-40 ℃

E355 STEEL

E355 steel material is the steel grade by DIN standard .E355 is a basic quality steel for various construction and engineering purposes, used in eg. mining applications as drill tubes.

WORDWIDE EQUIVALENTS of GRADE E355 (Germany :DIN ,WNr)

EU EN	USA	Germany DIN,WNr	France AFNOR	England BS	Italy UNI	Sweden SS	Poland PN	Czechia CSN	Austria ONORM	Russia GOST
E355 (1.0580）	Gr.65	1.0060 E355 St52 St52-3	E355 ES355 TS47a TU 526	CEW5 CFS5 E335 ERW5N KM ERW5N ZF	E355 Fe510	1650	MSt6	1650	St60F	St6sp

CHEMICAL COMPOSITION of E355

Steel Grade	C	Si	Mn	P	S	V	Al
E355	≤0.22	≤0.55	≤1.70	≤0.030	≤0.030

E355 MECHANICAL PROPERTIES

Steel Grade	Tensile Strength	Yield Strength	Elongation
E355	≥490（T ≤16）	≥355（T ≤16）	≥20

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