20 # seamless steel pipe
source£ºchengdu chengfa jinhui traning co.,ltd time£º2016-01-29
20 # seamless steel pipe Profile
20 # 20 # seamless steel pipe made of steel, higher strength than # 15, very little quenching, no temper brittleness. Cold deformation crack-prone high plasticity, usually for bending, welding performance calendar, curved edges and hammer arch and other processing, and exposure to arc welding, gas welding small thickness, shape demanding or complex shape of the workpiece. Cutting of cold drawn annealed or normalized relatively good state, generally used for manufacturing large discontinuity toughness requirements.
20 # seamless steel pipe material: high-quality carbon structural steel
Grade: 20 Steel
Standard: GB8162-2008GB / T8163-2008GB3087-2008GB9948-2006GB5310-2008
Strength steel is slightly higher than 15, very little quenching, no temper brittleness. Cold deformation crack-prone high plasticity, usually for bending, welding performance calendar, curved edges and hammer arch and other processing, and exposure to arc welding, gas welding small thickness, shape demanding or complex shape of the workpiece.
ingredient
chemical composition:
Carbon C: 0.17 ~ 0.2 Si Si: 0.17 ~ 0.37 Mn Mn: 0.35 ~ 0.65 Sulfur S: ¡Ü0.035 phosphorus P: ¡Ü0.035 chromium Cr: ¡Ü0.25 Ni Ni: ¡Ü0.25 Copper Cu: ¡Ü0.25
Mechanical properties:
Tensile strength ¦Òb (MPa): ¡Ý410 (42) Yield strength ¦Òs (MPa): ¡Ý245 (25) Elongation ¦Ä5 (%): ¡Ý25 Reduction of area ¦× (%): ¡Ý5, Hardness: no heat treatment , ¡Ü156HB, sample size: sample size 25mm
Heat treatment and microstructure:
Heat treatment specifications: normalizing, 910 ¡æ, air cooling. Microstructure: ferrite and pearlite.
Delivery status: to no heat treatment or heat treatment (annealing, normalizing or tempering) state delivery. It requires heat treatment delivery should be specified in the contract, not indicated by not heat treatment delivery.
Process
Hot-rolled (extrusion seamless steel pipe): round tube perforation ¡ú ¡ú heating ¡ú three-roll rolling, rolling or extrusion ¡ú detached ¡ú sizing (or reducing) ¡ú cooling ¡ú billet tube straightening ¡ú ¡ú Quality wall thickness ¡ú hydrostatic test (or testing) ¡ú mark ¡ú storage.
Cold drawn (rolled) seamless steel pipe: round tube perforation ¡ú heating ¡ú ¡ú ¡ú annealing ¡ú pickling ¡ú Heading oiled (copper) ¡ú multi-pass cold drawn (cold) ¡ú blank tube ¡ú heat treatment ¡ú straightening ¡ú Quality wall thickness ¡ú hydrostatic testing (testing) ¡ú mark ¡ú storage.
