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The group of Chinese (GB) standard specifications covers iron and carbon and alloy steel within different delivery conditions such as plates, strips, shits, bars, wires, castings, forgings etc. All character set standards that originate in the PRC have designations that begin with "GB". GB is an abbreviation of Guojia Biaozhun, meaning "national standard".
GB standards are the Chinese national standards issued by the Standardization Administration of China (SAC), the Chinese National Committee of the ISO and the IEC. This article gives information on the following material categories:
For more information on the GB designation system see Introduction to the GB Standard Designation System.
The list of standards below cover a wide range of materials and applications a few of which are:
| Standard Number | Last version | Description | Status |
| GB/T 1348 | 2009 | Spheroidal graphite iron castings | /28/ |
| GB/T 1412 | 2005 | Pig iron used for spheroidal graphite cast iron | /2/ |
| GB/T 717 | 1998 | Pig iron for steelmaking | /No materials/ |
| GB/T 718 | 2005 | Foundry pig iron | /No materials/ |
| GB/T 719 | 2004 | Pig iron - Sampling for chemical analysis | /No materials/ |
| GB/T 9439 | 2004 | Grey iron castings | /6/ |
| GB/T 9440 | 2004 | Malleable iron castings | /12/ |
| GB/T 9441 | 1988 | Metallographic test for spheroidal graphite cast iron | /No materials/ |
| GB/T 9971 | 2004 | Pure iron for raw material | /No materials/ |
| Standard Number | Last version | Description | Status |
| GB 13013 | 2004 | Hot rolled plain steel bars for the reinforcement of concrete | /1/ |
| GB 13014 | 2004 | Remained heat treatment ribbed steel bars for the reinforcement of concrete | /1/ |
| GB 1499 | 2008 | Hot rolled ribbed steel bars for the reinforcement of concrete | /13/ |
| GB 18248 | 2008 | Seamless steel tubes for gas cylinder | /6/ |
| GB 19189 | 2003 | Quenched and tempered high strength steel plates for pressure vessels | /3/ |
| GB 2270 | 1980 | Seamless tubes | /19/ |
| GB 2517 | 1981 | Sheets and strips for structure | /6/ |
| GB 3087 | 2008 | Seamless steel tubes for low and medium pressure boiler | /4/ |
| GB 3531 | 2008 | Low alloy steel plates for low temperature pressure vessels | /5/ |
| GB/T 11251 | 2009 | Hot-rolled alloy structural steel plates | /26/ |
| GB/T 1591 | 2008 | High strength low alloy structural steels | /37/ |
| GB/T 16270 | 2009 | High-strength structural steel plates and strips: products supplied in the heat-treated or controlled rolled condition | /14/ |
| GB/T 17107 | 2004 | Structural steel grades and mechanical property for forgings | /78/ |
| GB/T 20564-1 | 2007 | Continuously cold rolled high strength steel sheet and strip for automobile - Part 1:Bake hardening steel | /5/ |
| GB/T 20564-3 | 2007 | Continuously cold rolled high strength steel sheet and strip for automobile - Part 3: High strength interstitial free steel | /3/ |
| GB/T 20887-1 | 2007 | Continuously hot rolled high strength steel sheet and strip for automobile. Part 1: High yield strength steel for cold forming | /11/ |
| Standard Number | Last version | Description | Status |
| GB 13296 | 2007 | Seamless stainless steel tubes for boiler and heat exchanger | /34/ |
| GB 4234 | 2004 | Stainless steel for surgical implants | /4/ |
| GB/T 1220 | 2007 | Stainless steel bars | /197/ |
| GB/T 14975 | 2004 | Stainless steel seamless tubes for structures | /23/ |
| GB/T 14976 | 2004 | Stainless steel seamless tubes for fluid transport | /29/ |
| GB/T 18705 | 2002 | Welded stainless steel pipes for decoration | /2/ |
| GB/T 20878 | 2007 | Stainless and heat-resisting steels - Designation and chemical composition | /283/ |
| Standard Number | Last version | Description | Status |
| GB 5676 | 1985 | Carbon cast steel | /10/ |
| GB/T 11352 | 2009 | Carbon steel castings for general engineering purposes | /10/ |
| GB/T 1503 | 2008 | Cast steel rolls | /16/ |
| GB/T 1504 | 2008 | Cast iron rolls | /No materials/ |
| GB/T 16253 | 2004 | Steel castings for pressure purposes | /16/ |
| GB/T 17445 | 2009 | Cast grinding balls | /6/ |
| GB/T 14408 | 2004 | Low alloy steel castings for general engineering and structural purposes | /8/ |
| GB/T 2100 | 2004 | Corrosion-resistant steel castings for general applications | /36/ |
| Standard Number | Last version | Description | Status |
| GB/T 17493 | 2008 | Low alloy steel flux cored electrodes for arc welding | /142/ |
| GB/T 3429 | 2002 | Wire rod for electrode | /49/ |
| GB/T 4241 | 2006 | Stainless steel wire rods for welding | /59/ |
| GB/T 5117 | 2004 | Carbon steel covered electrodes | /33/ |
| GB/T 8110 | 2008 | Welding wires for gas shielding arc welding of carbon and low alloy steels | /33/ |
| GB/T 983 | 1995 | Stainless steel covered electrodes | /77/ |