GB/T 699-2015- Quality carbon structural steels- China GB standard free download.

GB/T 700-2006 Carbon structural steels - free download.

GB/T 702-2017 Hot-rolled steel bars- Dimensions, shape, weight and tolerance - China GB standard free download.

GB/T 708- 2006 Dimension, shape, weight and tolerance for cold-rolled plates and sheets - China GB standard free download.

GB/T 709-2006 Dimension, shape, weight and tolerance for hot-rolled plates and sheets - China GB standard free download.

GB/T 711-2008 -Hot- rolled quality carbon structural steel plates, sheet and wide strips - China GB standard free download.

GB 713-2014 Steel plates for boilers and pressure vessels.- China GB standard free download.

GB/T 1591-2008 High strength low alloy structural steels standard – GB /T 1591-2008 - China GB standard free download.

GB/T 3274-2007 Hot-rolled plates and stripes of carbon structural steels and high strength low alloy structural steels- China GB standard free download.

GB/T 3078-2008 Technical requirement for quality structural steel cold drawn bars- China GB standard free download.

GB 4237-2007 Hot rolled stainless steel sheets and plates - China GB standard free download.

GB 3280- 2007 Cold rolled stainless steel sheets and plates - China GB standard free download.

GB/T706-2008 Hot rolled section steel - China GB standard free download.

GB 50205 – 2001  Code for Acceptance of Construction Quality of Steel Structures - free download

GB T 14976-2012 Seamless Stainless Steel Pipes for Fluid Transport- China GB standard free download.