As you 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.
All Chinese standards are having prefix GB like IS for Indian Standard, JIS for Japanese. For Construction related works and other works different Chinese standards are followed, which are listed below.
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 chequred 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.
For More Details about European Steel Section Click Here
For More Details about Classification of Indian Steel Click Here
For More Details about Indian Standard for Rolled Steel Click Here