6.2　Vertical Extrusion Press

6.2.1　Either torch cutting machine or sawing machine may be selected for ingot riser cutting.

6.2.2　Ingot grinding machine should be provided for raw material grinding.The grinder shall conform to the requirements as follows.

1　It can grind both cold and hot ingots.

2　It can grind torch-cut surface of the ingot.

3　It can grind the top and side surface of the hollow billet.

4　The grinding machine shall be equipped with dedusting unit.Direct emission of dust generated during grinding is strictly prohibited.

6.2.3　The bogie-hearth furnace can be selected for heat treatment；the chamber furnace or rotary-hearth furnace may also be a choice for the same.

6.2.4　Hydraulic descaler shall be selected for high-pressure descaling，and the pressure of descaling water shall not be lower than 18MPa.

6.2.5　The equipment which is able to simultaneously inject glass powder onto inside and outside surface of the billet shall be selected for lubrication prior to piercing and extrusion.

6.2.6　The vertical piercer shall be used for expanding（piercing）process；and the equipment selection shall conform to the requirements as follows.

1　The piercer shall have functions of upsetting and piercing.

2　The maximum upsetting capacity shall satisfy the need of pipe production.

3　The inside diameter of piercing container shall match the ingot dimension.

4　The inside and outside surface after piercing shall be free of serious crack and depression.

5　The matchable manipulator shall be provided for the equipment.

6　Cooling and cleaning devices for tools and dies shall be provided for the equipment.

7　Expanding（piercing）section should be equipped with tool & die preheating unit and diechanging device.

6.2.7　Selection of vertical extrusion equipment shall conform to the requirements as follows.

1　The oil should be used as transmission media for extrusion press，and the water may be used as an alternative.

2　The maximum extrusion force shall meet the product extrusion requirement.

3　The inside diameter of extrusion container shall match the billet diameter.

4　The matchable manipulator and the billet tilting device shall be provided for extrusion press.

5　Cooling and cleaning devices as well as preheating unit shall be provided for tools and dies.

6　Special changing device and lifting equipment should be available for tools and dies.

6.2.8　The bogie-hearth furnace can be selected for heat treatment.

6.2.9　The shot-blasting machine for inside and outside surface shall be equipped with dedusting unit.Direct emission of dust generated during shot blasting is prohibited.

6.2.10　The straightening press may be selected for straightening process.

6.2.11　The boring machine can be selected for inside surface machining.The outer surface machining can be performed with cylindrical lathe，or dry-type or wet-type grinding machine.The selection of dry-type grinding machine shall conform to the requirements as follows.

1　It shall be able to perform full-length outside grinding for steel pipe；and the outer surface of pipe after grinding shall be free of defects like scratch and depression.

2　Dedusting unit shall be installed when grinding is performed by cylindrical grinder with abrasive wheel；and direct emission of dust generated during grinding is strictly prohibited.

6.2.12　Ultrasonic flaw detector and surface flaw detector shall be installed in the workshop；and other NDT equipment can be added if necessary.

6.2.13　The NDT equipment shall have functions to mark and record defects.

6.2.14　The inspection section should be provided with comprehensive measuring devices that are able to measure pipe wall thickness，inside & outside diameter，camber，weight，etc.