Description
The retained mandrel bars for the
production of large-sized seamless steel pipe is used in sectional
structure. Its working section is exposed to complex and huge
surface pressure as well as thermal cold-hot fatigue, whereas its
connection part has to withstand mechanical forces during the
pressing process.
The working part of the retained mandrel
barsproduced by Besco adopts H*3 hot-work die steel.The
production processes,that include smelting,forging,rough
machining,heat treatment,semi-finished & finished
machining,chrome plating and phosphate treatment,ensures the
following characteristics.
Besco is upgrading the mandrel material bars and its
manufacturing technology in close collaboration with .
Material: H*3 & *2CrMo
Diameter: *****0mm
Length: *********0mm
The
Retained Mandrel Bar is one of
the key instruments to manufacture seamless steel tubes. Our
company is capable of producing a series of mandrel, such as MPM,
PQF, FQM, with the diameter ofΦ*****0mm, the length of
*********0mm, as a result of making the best use of our advantage
in steel making, forging, heat treatment, machining plating
chromium adequately. The raw steel material is AISI H*3 or
4CrMoSiV1, based on enterprise specifications.
Mandrel extension part
Steel grade:*2CrMo or according
to customer's requestment.
Standards:chemical composition as
per GB***7, others as per detailed drawing picture.
Hardness:hardness is ******0HB
after quenched and tempered.
Mandrel tail part
Steel grade: *2CrMo
Standard: cheimical compositon as per GB********1,and other
details can be as per customer's drawings
Process: machining
+ heat treatment
Hardness: ******0
after heat treatment.
