As per client requirements, we planned this annual output 150000 tons capacity for hot rolling seamless tube plant design, manufacture roughly as below: This production mill line will install a set medium diameter 18m circular furnace, 1 set 140 cone type piercing mill, 1 set three roll Assel rolling mill, 1 set of 18 stands 420 stretch reducing mill, 1 set 140 straightening machine with other auxiliaries equipment, will suggest requirements and basic assignment book to client for public facilities of production process to complete this plant built.

The design scope and its production process： A.The design scope The layout design of hot rolling steel seamless tube mill line: there are 4 sets of main equipment, cone type roller piercing mill, Assel tube rolling mill, 18 stands of stretch reducing mill, 6 roll straightening machine, cooling bed and auxiliaries equipment that roll conveyor, transmit equipment etc.) Production process connection of seamless steel tube rolling mill The requirements of public facilities for production process equipment. B.Explain for production flow： To meet the requirement of production program Adopt big size billet diameter 200mm, piercing mill roller open gap up 250mm. Production flow : Subject to late discuss to confirmation

Billet —→Inspecting—→Repairing—→Saw cutting—→Heating—→Piercing—→Assel mill rolling —→Stretch reducing mill—→Cooling tube—→Straightening tube—→Cut tubes to length—→Visual checking —→Separating—→Bounding

A.Production program a.Products sizes: OD: （Φ60）Φ76mm～Φ168.3mm，Wall thickness: 8.0mm（6.0mm）～40.0mm Steel grade: General carbon steel, alloy steel, Bearing steel b.Output annual: 150000 Tons c.Finish tube length: 6～12M d.Billet size range: （Φ110、Φ130）Φ150mm～Φ200mm, Length: 2000mm～4000mm B.Products tolerance requirement a.Sizes tolerance perform as per GB/T8163-2008 Outside diameter tolerance: ±0.75%Dor±0.40 Wall thickness: ±7.5%S ±0.35， b.Tube bending precision after straighten: ≤1.0/1000 c.Standard to be conformed： GB5310-2008 /GB3087-2008（ High, low pressure boil tubes） DIN17175,ASTM A106 GB/T8162-2008（structural tubes）DIN17172 API 5L, ISO3180 A&B, X42-X70, line pipe ASTM A53 General tubes. DIN 1629 Mechanical tubes. API 5DP Drill pipe