Description
Product Classification and Material Grades
1. Welding Type (Mainly Type E is selected)
Type E ERW High Frequency Straight Seam Pipe: Steel strip is rolled and formed by roller pressing + high-frequency resistance fusion welding, without filler wire, short weld seam, high dimensional accuracy, sufficient in stock, and the preferred choice for engineering projects;
Type F Furnace Welding Pipe: Old process, only for small diameters, poor forming performance, rarely used in new projects.
2. Two Major Material Grades
Grade A: Low carbon material, excellent plasticity and cold bending performance, suitable for bending, tube rolling, and low-pressure pipelines, yield ≥ 205 MPa, tensile strength ≥ 330 MPa;
Grade B (Mainstream in the market): Higher carbon and manganese content, stronger strength and pressure-bearing capacity, yield ≥ 240 MPa, tensile strength ≥ 415 MPa, balancing welding performance and structural load-bearing capacity, suitable for water, gas, and steel structure engineering.
Production Process and Specification System
Process Flow
Steel coil unwinding → straightening and edge milling → roller-pressed round pipe forming → high-frequency resistance welding → deburring of inner and outer weld seams → heat treatment for weld seam stress elimination → sizing and straightening → fixed-length cutting → water pressure / eddy current testing → final inspection.
Size Standards
Follow ASME B36.10M American standard pipe size, nominal diameter NPS 1/8 to NPS 26, wall thickness SCH40, SCH80, SCH160 and other conventional wall thicknesses;
Pipe ends available options: flat end, threaded end, bevel groove end, suitable for threads, welding, clamps and other connection methods. Surface treatment
Black Pipe: Factory rust removal and anti-rust oil application; outdoor can be painted for anti-corrosion;
Hot-dip galvanized pipe: Uniform galvanized layer both inside and outside the pipe wall, anti-corrosion and resistant to moisture, suitable for outdoor water supply and drainage, fire protection branch pipes.
Core Product Advantages
Stable and safe weld seams
Single straight weld seam per pipe section, with lower defect probability compared to spiral welded pipes; each pipe material must undergo water pressure test (holding pressure ≥ 5 seconds) and weld seam eddy current non-destructive testing to eliminate false welding and leakage risks.
Strong processing adaptability
Material has balanced plasticity, can be welded, threaded, grooved, cold bent, and flanged, meeting diverse on-site construction needs.
Outstanding cost performance
Continuous rolled material production, high yield rate, cost much lower than A53 seamless pipes of the same specification, the optimal economic solution for general low-pressure working conditions.
High dimensional accuracy
Strict roundness and wall thickness tolerances, flat pipe ends, good sealing performance of flanges and pipe fittings connection, higher construction efficiency.
Main application scenarios
Fluid transportation pipelines
Municipal tap water, low-pressure gas, compressed air, ambient temperature steam, sewage treatment pipelines;
Construction and steel structures
Plant guardrails, column supports, steel structure supports, scaffolding, cable conduit sleeves;
HVAC and fire protection projects
Central air conditioning water circulation pipelines, civilian fire sprinkler branch pipes (galvanized A53 Gr.B);
Foreign trade machinery accessories
Equipment water and gas transportation pipelines, agricultural irrigation pipelines, general machinery structural sleeves.
