Q355D steel plate standard external marking composition

Q355D steel plate is a type of high-strength low-alloy structural steel defined in the Chinese national standard GB/T 1591-2018 "High Strength Low Alloy Structural Steels." It features high yield strength and excellent welding and processing properties. According to the national standard, Q355D has a yield strength of 355 MPa, and the "D" represents the quality grade of the material, which is typically related to the impact test temperature.

Internationally, there is no direct equivalent material for Q355D steel plate, but similar foreign standard materials can be identified based on its chemical composition and mechanical properties. For example:

1. **European Standard (EN)**: Q355D can be compared to the S355 series steels in the European standard EN 10025-2, particularly S355J2W, S355J0W, etc. These materials also have a yield strength of approximately 355 MPa, though specific chemical compositions and mechanical properties may differ.

2. **American Society for Testing and Materials Standard (ASTM)**: The chemical composition and performance of Q355D may be similar to A572 Grade 50 or A709 Grade 50W, which are high-strength low-alloy steels defined in American standards.

3. **Japanese Industrial Standard (JIS)**: Q355D may be comparable to SM490YB or SM490C in JIS G 3106, which are steels defined for welded structures in Japanese standards.

4. **German Industrial Standard (DIN)**: Q355D may resemble St 52-3 N in DIN 17100 or W St E 355 in DIN 17102, which are structural steels defined in German standards.

5. **British Standard (BS)**: Q355D may be similar to 50D or 50E in BS 4360, which are welding structural steels defined in British standards.

In practical applications, specific engineering requirements and usage environments must be considered when selecting alternative materials. Steel standards from different countries may vary in terms of chemical composition, mechanical properties, impact test temperatures, and other aspects. Therefore, engineers and procurement personnel should conduct detailed comparisons of the specific requirements of relevant standards and perform material testing when necessary to ensure that the selected material meets engineering needs and safety standards. Additionally, considering the demands of international trade and project collaboration, using internationally recognized material standards can help reduce obstacles in material substitution and certification processes.