Q: What is the standard value of yield strength for Q355D steel plate?
A: Yield strength ≥355MPa for thickness ≤16mm, ≥345MPa for thickness 16~40mm, ≥335MPa for thickness 40~63mm, ≥325MPa for thickness 63~80mm, and ≥315MPa for thickness 80~100mm.
Q: What is the range of tensile strength for Q355D?
A: The uniform tensile strength requirement is 470~630MPa, with no difference across thickness ranges.
Q: What is the standard requirement for elongation (A) of Q355D?
A: Elongation after fracture A ≥ 21% (gauge length 50mm) to ensure the steel plate's plastic deformation capacity.
Q: What are the specific requirements for low-temperature impact energy of Q355D?
A: At -20℃, the Charpy V-type impact energy (KV2) should be ≥27J for a single value and ≥34J for the average value. One single value below the average is allowed, but not below 27J.
Q: Is room temperature impact testing required for Q355D?
A: There is no mandatory room temperature impact requirement. The core test is the -20℃ low-temperature impact. Additional testing can be negotiated if the customer has specific requirements.