What standards apply?
A:Material: GB/T 700-2006
Steel plate: GB/T 3274, GB/T 709
What is the typical hardness?
A: 120–160 HB (Brinell), soft and easy to machine/form.
Can Q235 be used for pressure vessels?
A: For low-pressure, non-corrosive service only. Not for critical or high-pressure vessels.
How to verify Q235 material?
A: Check Mill Test Certificate (MTC); perform spectrometry (chemical analysis) or mechanical testing.
3What are common purchasing risks?
A:
Grade substitution (A for B/C/D)
Off-spec chemical/mechanical properties
Size deviations (thickness/width/length)
Surface defects