Tube Forging Hollow Bars

A forged bar or a rolled bar is produced by taking an ingot and forging it down to size by, generally, two opposing flat dies. Forged metals tend to be stronger, harder and more durable than cast forms or machined parts. You can get a wrought grain structure throughout all sections of the forgings, increasing parts ability to withstand warping and wearing.     Product Description Tube-forging hollow bars are seamless, hot-rolled sleeves produced by piercing, elongating and sizing low-alloy or stainless billets. Outside diameters range 120–1 200 mm, wall 15–200 mm, length ≤ 12 m, weight ≤ 15 t. Starting material is vacuum-degassed 4130, 4140, 42CrMo, 34CrNiMo6, F22 or duplex stainless; ESR melting is optional for aerospace grades. After piercing, a mandrel mill or cross-rolling forge refines wall thickness to ±1 mm and yields true 360° circumferential grain flow.   Performance Quench-temper or normalize delivers 550–950 MPa yield, 750–1 100 MPa tensile, ≥ 35 J at –40 °C Charpy; core…

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