Import Black Erw Dn100 Steel Pipe — Buy in Bulk from Supplier in China

Black ERW DN100 steel pipe is a longitudinally electric-resistance-welded carbon steel tube with a nominal diameter of 100 millimetres, supplied by Reliance Metal Resource Co. from Tianjin, China. The supplier offers steel grades Q195, Q235, and Q345 with wall thicknesses from 0.5mm to 12mm and outer diameters spanning 20mm to 273mm, covering DN100 and adjacent sizes. Length options range from 5.8 metres to 12 metres with negotiation possible for non-standard dimensions. The black finish refers to the absence of protective zinc coating, leaving the steel surface in its mill-conditioned state with only an anti-rust oil or varnish treatment unless additional protection is specified.

ERW welding forms the longitudinal seam by electrical resistance heating, pressing the heated edges together without filler metal addition. Q195 offers lower carbon content suitable for light structural and fluid conveyance applications; Q235 provides the general-purpose structural grade with balanced strength and formability; Q345 delivers higher yield strength for load-bearing structures. Wall thickness tolerance for ERW pipe typically follows GB/T 3091 or ASTM A53 specifications, with welded seam height controlled to avoid interference with threading or grooving operations. The DN100 designation corresponds to approximately 114.3mm outer diameter for standard pipe schedules, though actual dimensions must be confirmed against the specific schedule and wall thickness ordered. Surface treatments available include 3PE corrosion protection, black or colour painting, anti-rust oil, varnish, zinc coating, steel stamping, drilling, and diameter reducing.

Buyers span construction contractors for building frames and scaffolding, agricultural equipment manufacturers for implement mounting and fluid systems, and infrastructure developers for water and gas distribution networks. The stated supply capacity of 360,000 tons per year indicates large-scale production capability. Loading occurs at Xingang port, Tianjin. Buyers should confirm which steel grade, wall thickness, and surface treatment combination suits their application, as well as verifying mechanical test certificates and welding procedure qualifications for structural or pressure-containing uses.

Reliance Metal Resource Co. operates from Hi-Tech Information Square, Building C, Nankai District, Tianjin 300384, China. The company identifies itself as both a manufacturer and trading company, suggesting integrated production and export operations or affiliated mill relationships. The supplier holds an imported tier designation with harbor trust status on the platform. Response metrics show 0.00 percent response rate with zero average response hours, indicating no communication data is currently recorded. The profile does not disclose founding year, number of employees, factory floor area, or specific mill equipment owned versus subcontracted.

The company states an annual supply capacity of 360,000 tons and offers certifications including BV, IAF, SGS, COC, and ISO, though certificate numbers, accreditation scopes, and validity dates are not provided in the source material. Reliance Metal Resource Co. serves building materials, machine structure, agriculture equipment, and water and gas pipe markets. Buyers should independently verify production facilities, quality management system certification scope, and whether the offered grades and specifications are produced in-house or sourced from partner mills. All trade terms, delivery commitments, and certification claims require direct confirmation with the supplier.