Q550D high-strength structural steel
1 The main purpose
Mainly used in important (low temperature) high-strength structural parts, construction machinery, mining and steel parts.
2 grades and standards
Grade Q550D; Standard: GB / T 16270-1996
3 The main chemical components
Grade C Mn Si P S Al other
Q550D ≤ 0.18 1.00 ~ 1.60 ≤ 0.55 ≤ 0.030 ≤ 0.030 ≥ 0.015 the amount

4 Mechanical Properties
Grade Specifications (mm) yield strength σs? MPa tensile strength σb? MPa Elongation δ5?% -20 ℃ impact test
Akv? J vertical
Q550D ≤ 50 ≥ 550 670 ~ 830 ≥ 16 ≥ 40