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