How to identify Q235 grade?
A: Check mill certificate (chemical/mechanical data); impact test report for B/C/D.
What is the price level of Q235?
A: Low–medium; cheapest among structural steels; A < B < C < D.
What are the common defects of Q235 plate?
A: Surface: rust, scratches, roll marks; Internal: inclusions, porosity, segregation.
What is the tolerance standard for Q235 plate?
A: GB/T 709-2019 (hot-rolled plate).
Does Q235 require ultrasonic testing (UT)?
A: Normally no; UT optional for critical applications (e.g., pressure vessels).