Production methods can be divided into:Pressing, forging, casting, etc.

Manufacturing standards division can be divided into:GB, American Standard, German standard, Japanese standard, the Russian standard, etc.

Take over size is: Sch5s,Sch10s,Sch10,Sch20,Sch30,Sch40s,STD,Sch40,Sch60,Sch80s,XS;Sch80,SCH100,Sch120,Sch140,Sch160,XXS.

Material: Grade1 Grade2 Grade5 Grade7 Grade9 Grade12 etc.

Standards: GB/T12459,GB/T13401,ASME B16.9,SH3408,SH3409,HG/T21635,HG/T21631,

SY/T05010 standards