Dear Readers,
As you are well aware due to globalization all
works has been very competitive and it is helping us to exchange of knowledge
and standards, in this scenario Chinese works are having more impact and
competition throughout the world. Now it is very essential to know the Chinese
standards and how it is indicated in drawings. Let us discuss how to identify
and compare with our standards.
GB= GuojiaBiaozhun( National Standard in
Chinese)
SY = Shi You (Petroleum)
JB =
JianBiao(Construction Standard)
GB/T = T : Tuijian(recommended GB)
HG =
HuaGong (PetroChemical)
Chinese standards for General structural
steel (including chequered steel) is GB/T 700-2006. Grade of materials
available is Q235 (A/B/C/D); Q275 (A/B/C/D).
Generally Chinese Steel Grades are Q195,
Q215, Q235, Q255 and Q275 is used for Structural works. steel grades by the
yield point of the letter on behalf of (Q) and yield point value is mentioned
and sub grade A, B, C & D are used for further classification. For Example
Q235A means, it is a carbon steel and having maximum yield strength of 235 Mpa
For Steel section Channel is mentioned as
"C"; Angles are mentioned as "L" and Beams are mentioned as
“I “or “H " followed by number. To find out the size of section is number
multiple by 10 is the size of member.
For Example C16 means Channel 160 mm depth. Similarly
H10 means H section 100 mm depth.
If the same size but width or Flange size is
different then suffix a, b, c is shown. For example C20a & C20b, Both are
200 Channel however flange is 73 and 75 mm respectively. C20a means Channel 200
X 73 and C20b means Channel 200 X 75