LSAW Carbon Steel Pipe 219mm

Carbon Steel's Ductility: The Foundation for Seamless Forming

Ductility (the ability to bend without breaking) is the key trait that lets carbon steel survive pipe forming-and it's precisely why we choose carbon steel for our ERW and HFW lines, unlike pure iron which shatters under the same stress.

ERW Forming: Gradient Rolling Without Cracks

ERW pipe forming relies on "gradient rolling"-passing flat carbon steel coils through a series of rolls that gradually bend the metal into a cylinder. Carbon steel's ductility ensures this process happens without cracks, a feat pure iron can't match. At Huayang:

Material Selection: We use low-carbon steel (Q235 grade, 0.12%-0.22% carbon) for ERW forming, as it balances ductility and strength. Our Q235 steel bends 180° around a mandrel (radius = 3×pipe thickness) without permanent deformation-critical for shaping pipes from 15mm to 325mm diameter;

Equipment Optimization: Our ERW gradient rolls are calibrated to apply 5°-15° of bend per pass, matching carbon steel's ductility limits. For example, when producing Φ25×2.77mm ERW pipes (used in the 2024 Baoding Affordable Housing Project), the rolls bend the steel coil in 8 stages-avoiding sudden stress that would crack pure iron;

Quality Results: Our ERW carbon steel pipes have a 99.8% forming pass rate, with zero cracks or splits. By contrast, pure iron coils tested in our lab crack in just 2-3 rolling stages, making ERW forming impossible.