What is equivalent to Q345B steel

Q345B steel is a Chinese standardized low alloy, high-strength structural steel grade. The equivalent international grades to Q345B steel include:

1. ASTM A572 Gr 50:
- ASTM A572 Gr 50 is an American standard low alloy high strength steel, providing similar strength properties to Q345B steel.

2. EN S355:
- EN S355 is a European standard structural steel grade under EN 10025, offering comparable mechanical properties such as tensile strength, yield strength, and elongation.

3. BS 50B:
- BS 50B is a British standard structural steel grade found in BS 4360, sharing some characteristics with Q345B steel.

4. DIN St52-3:
- DIN St52-3 is a German standard structural steel grade within DIN 17100, exhibiting similarities in performance to Q345B steel.

While these are approximate equivalents, it's essential to verify specific requirements for each project and consider variations in steel standards across different regions. Consulting with a professional engineer or referencing the relevant standards is recommended when selecting appropriate substitute materials.