Boat with forgings
Material used for hull , machinery, pressure vessels and forgings , forgings used for piping steel, carbon steel, alloy steel and stainless steel , the manufacturer should be approved by the relevant classification societies behind the production plant , after the products manufactured on-site supervision by a surveyor test , its chemical composition , mechanical properties, non-destructive testing and heat treatment procedures should be consistent with and meet the appropriate specifications and drawings marine classification society requirements , marine product certification issued by the surveyor before board use .
Manufacturing standard
1 , marine classification societies must meet forgings and welding material specification .
2 , back -trial drawings
3 , the reference standard
CB/T773-1998 structural steel forgings
CB/T1159-1998 shaft forgings
CB/T3907-1999 Marine ultrasonic testing of steel forgings
GB/699-1999 quality carbon structural steel
GB/3077-1999 alloy structural steel
GB6402-2008 ultrasonic testing of steel forgings methods
Rudder typical products
Connecting the rudder and steering gear or rudder tiller , steering torque transfer rotating rod , straight rudder tiller , disc tiller and rudder side , rudder plate welded connection points and the entire forging two forms , rudder stock material 20 20Mn 16Mn normalizing + tempering heat treatment