GB piping standards
Chinese National Standards (GB, GB/T) and industry standards (HG/T, NB/T, SH/T): Chinese standards — essential when buying imported pipe, fittings and flanges from China. GB = mandatory, GB/T = recommended. 28 standards most used in piping, flanges, fittings, valves and materials.
| Standard | Covers | Category | On this site |
|---|---|---|---|
| GB/T 699 | Quality carbon structural steels (grades 10, 20, 45) | Materials | Open → |
| GB/T 700 | Carbon structural steels (Q235) | Materials | Open → |
| GB/T 713 | Steel plates for boilers and pressure vessels (Q245R, Q345R) | Plate & structural | Open → |
| GB/T 1591 | High-strength low-alloy structural steels (Q355) | Materials | Open → |
| GB/T 3087 | Seamless steel tubes for low and medium pressure boilers | Tube | Open → |
| GB/T 3091 | Welded steel pipes for low-pressure liquid delivery | Pipe | Open → |
| GB 5310 | Seamless steel tubes and pipes for high-pressure boilers | Tube | Open → |
| GB 6479 | Seamless steel tubes for high-pressure chemical fertiliser equipment | Pipe | Open → |
| GB/T 8162 | Seamless steel tubes for structural purposes | Pipe | Open → |
| GB/T 8163 | Seamless steel tubes for liquid service | Pipe | Open → |
| GB/T 9711 | Line pipe (equivalent to ISO 3183 / API 5L) | Pipe | Open → |
| GB/T 9112–9124 | Steel pipe flanges (types, dimensions and technical requirements) | Flanges | Open → |
| GB/T 12459 | Steel buttwelding seamless pipe fittings | Fittings | Open → |
| GB/T 12771 | Welded stainless steel pipes for liquid delivery | Pipe | Open → |
| GB/T 13401 | Steel plate buttwelding pipe fittings | Fittings | Open → |
| GB/T 14383 | Forged socket-welding and threaded fittings | Fittings | Open → |
| GB/T 14976 | Seamless stainless steel pipes for fluid transport | Pipe | Open → |
| GB/T 17395 | Seamless steel tubes — dimensions, shapes, masses and tolerances | Pipe | Open → |
| GB/T 20878 | Stainless and heat-resisting steels — designations and chemical composition | Materials | Open → |
| GB/T 21833 | Seamless austenitic-ferritic (duplex) stainless steel tubes and pipes | Pipe | Open → |
| GB/T 24511 | Stainless steel plate and strip for pressure equipment | Plate & structural | Open → |
| GB 50235 | Code for construction of industrial metallic piping | Design codes | – |
| GB 50316 | Design code for industrial metallic piping | Design codes | – |
| HG/T 20592–20614 | Chemical-industry steel pipe flanges, gaskets and bolting — European (PN) system | Flanges | Open → |
| HG/T 20615–20635 | Chemical-industry steel pipe flanges, gaskets and bolting — American (Class) system | Flanges | Open → |
| NB/T 47008 | Carbon and low-alloy steel forgings for pressure equipment | Forgings | Open → |
| NB/T 47010 | Stainless and heat-resisting steel forgings for pressure equipment | Forgings | Open → |
| SH/T 3406 | Petrochemical steel pipe flanges | Flanges | Open → |
Subjects are short summaries, not official titles. Always buy the current edition from the issuing body; check which edition your project specification names.
Frequently asked questions
Which GB standards cover piping?
GB/T 699 (quality carbon structural steels); GB/T 700 (carbon structural steels); GB/T 713 (steel plates for boilers and pressure vessels); GB/T 1591 (high-strength low-alloy structural steels); GB/T 3087 (seamless steel tubes for low and medium pressure boilers); GB/T 3091 (welded steel pipes for low-pressure liquid delivery) and others listed on this page.
Last updated 2026-11-02