What is the relationship between the yield strength and thickness of Q355?
The greater the thickness, the lower the yield strength (GB/T 1591-2018):
≤16mm: ≥355MPa;
16–40mm: ≥345MPa;
40–63mm: ≥335MPa;
63–80mm: ≥325MPa;
80–100mm: ≥315MPa;
100–150mm: ≥295MPa.
What is the tensile strength range of Q355?
470–630MPa (applicable to all grades).
What are the elongation requirements for Q355?
A/B grade: ≥21%;
C/D/E grade: ≥22%.
What is the impact toughness (V-notch) of Q355? See Question 3. Core parameters: B (20℃), C (0℃), D (-20℃), E (-40℃), impact energy ≥ 27–34 J.
What is Z-direction performance (resistance to lamellar tearing)?
The tear resistance of thick plates along their thickness direction, categorized as Z15, Z25, and Z35, with reduction of area ≥ 15%, 25%, and 35% respectively, used in thick plate welded structures (such as nuclear power plants and bridges).