Q355 Steel, Q355B Q355C Q355D Properties, Composition & …
· According to GB/T 1591 -2018, Q355 has 3 quality levels: Q355B, Q355C and Q355D. "Q" is the first letter of Chinese Pinyin: "qu fu dian", which means Yield Strength, "355" is the minimum value of yield strength 355 MPa for steel …