The standards of fitting manufacturing:
GB/12459—90 Steel butt-welded seamless fittings 
GB/T13401—92 Steel plate butt-welded fittings
GB/T14383—93 Forged steel socket-welded fittings
GB/T14626—93 Forged steel threaded fittings
SH3406—96 Steel pipe flanges for petrochemical industry
SH3408—96 Steel butt-welded seamless fittings
SH3409—96 Steel plate butt-welded fittings
SH3410—96 Forged steel socket-welded fittings
SH3065—94 Technical standard for short radius elbows and returns in petrochemical tubular heater
HG/T21635-1987 Carbon and low alloy steel butt-welded seamless fittings
HG/T21631-1990 Steel seamed butt-welded fittings
HG/T21634-1988 Forged steel socket-welded fittings
HGJ529—90 Forged steel, Boss-- socket-welded, threaded and butt-welded
HGJ44~68—1997 Steel pipe flanges
ASME B16.9 —2001 Factory-made wrought steel butt-welding fittings
ASME B16.11—2001 Forged steel fittings, socket-welding and threaded
ASME B16.28—1994 Wrought steel butt-welding short radius elbows and returns
JISB2316 Forged steel socket-welded fittings
JIS B2313—1986 Steel plate butt-welded pipe fittings
GD87—1101—1~327 Steam and water piping spare parts& typical design for fire firepower power plant
DL/T515—93 Bending-pipe for electric power station
SY5257—91 Steel bending-pipe

In common use material standards:
GB1220—92 Stainless steel bars
GB3280—92 Cold-rolling stainless steel sheets and plates
GB/T4237—92 Hot-rolling stainless steel sheets and plates
GB/T14976—94 Stainless steel seamless pipes for fluid transport
GB12771—2000 Welded stainless pipes for liquid delivery
GB8163—1999 Seamless steel pipes for liquid service
GB9948—88 Seamless steel pipes for petroleum cracking
GB5310—95 Seamless steel pipes for high pressure boiler
GB6479—2000 High pressure seamless steel tubes for chemical fertilizer equipments
GB3087—1999 Seamless steel tubes for low and medium pressure boiler
GB/T3092—93 Welded steel pipe for low pressure liquid service
GB3077—1999 The technical condition for alloy structure steels
GB/T9711.1—97 Petroleum and natural gas industries—steel pipe for
pipelines—technical delivery conditions part 1：pipes of class A
GB3274—88 Carbon structural and low alloy steel hot-rolling thick steel plates and strips
GB/T1591—94 High strength low alloy structural steels
GB699—88 Technical condition of quality carbon structural steels
GB912—89 Hot-rolling plain carbon and low alloy structural thin steel sheets and strips
GB6654—96 Steel plates for pressure vessels
GB713—1997 Carbon steel &low alloy steel plates for boilers
GB711—88 Hot-rolling quality carbon structural steel plates and steel strips
GB1221—92 Heat-resistant steel bars
GB4238—92 Heat-resistant steel sheets and plates
GB3531—96 Low alloy steel plates for low temperature pressure vessels
GB5681—85 Hot-rolling steel strip for pressure vessels
GB/T5118—95 Low alloy steel welding rod
GB/T5117—95 Carbon steel welding rod
GB983—95 Stainless steel welding rod
GB985—88 Basic forms and sizes of weld grooves for gas welding, manual arc welding and gas-shielded arc 
weld 
GB986—88 Basic forms and sizes of weld grooves for submerged arc welding 
GB/T12716—91 60 degree taper thread
GB/T7306 .1—2000 55 degree sealed pipe threads—part1: column internal thread and taper external thread
GB/T7306 .2—2000 55 degree sealed pipe threads—part2：taper pipe internal thread and taper pipe 
external thread
GB/T3091-1993 Galvanized welding pipe for low pressure liquid transportation
GB/T8165-1997 Stainless steel complex plate& steel strips 
GB/T11251-1989 Hot-rolling thick steel plates of stainless structure steel 
GB/T11253-1989 Cold-rolling thin steel plates and strips of carbon structural and low alloy structure steel
GB/T12470-1990 Flux for low alloy steel submerged arc welding 
GB/T13237-1991 Quality carbon structural steel cold-rolling thin steel plates & strips
JB/T84-1994 Welding neck collar plate FM&FMF lap joint steel pipe flange 
JB/T85-1994 Lap joint steel pipe flange
JB/T86.1-1994 FM steel pipe flange cap
JB/T86.2-1994 MF & FMF steel pipe flange cap
YB(T)44-1986 Electric-welding steel pipe for liquid transportation 
YB(T)41-1987 Low alloy thick steel & carbon steel for boiler
YB(T)32-1986 Cold-drawing seamless pipe for high pressure boiler 
YB(T)33-1986 Cold-drawing seamless pipe for high & medium pressure 
GB700-88 Carbon structural steel 
HG20592-20614-97 Steel pipe flange [Euro]
HG20615~20635-97 Steel pipe flange [American]
API spec5L-2004 Specification for pipe line steel pipe (43rd Edit)

Inspection standards:
GB231—84 Metallic materials—Brielle hardness test
GB228—87 Metallic materials—Tensile testing
GB6397—86 Metallic materials—Test samples for tensile testing
GB3323—87 Classification of radiographic inspection and quality steel fusion butt-welding joint 
GB10561—89 Steel—Micro-determination of nonmetallic lards
GB1979—80 Standard diagrams for micro-tissue and defect of structural steels
GB226—91 Methods of acid etch test for micro-tissue and defect of steels
GB4334.1—2000 Methods of 10% oxalic acid etch test for stainless steels
GB/T1804—2000 General tolerance linear angular dimensions and non-noted tolerance
JB4726—2000 Carbon and low alloy steel forgings for pressure vessels
JB4727—2000 Low alloy steel and carbon forgings for low temperature pressure vessels
JB4728—2000 Stainless steel forgings for pressure vessels
JB4730—94 Nondestructive testing of pressure vessels
JB4708—2000 Welding procedure qualification for steel pressure vessels
JB4709—2000 Welding specification for steel pressure vessels
JB4744—2000 Mechanical capability tests for welding test board of steel pressure vessels products
YB/T5148—93 Metal-methods for estimating the average grain size
GB/T12604.1—1990 Non-destructive testing: UT
GB/T12604.2—1990 Non-destructive testing: RT 
GB/T12604.5—1990 Non-destructive testing: MT 
GB/T4338—1995 High-temperature tensile testing for metal materials
GB/T232—1999 Bending testing for metal materials
GB222—84 Method for chemic analyzing sampling of steel and chemic components allowable tolerance of finished products