NEWS

I. Basic Classification of Steel Materials

**Plate Products:** Hot-rolled coils, cold-rolled coils, medium-to-heavy plates, galvanized sheets, color-coated sheets. *Applications:* Machinery manufacturing, pressure vessels, shipbuilding, roofing and wall cladding, appliance casings.

**Structural Steel Shapes:** H-beams, I-beams, channel beams, angle bars, steel sheet piles. *Applications:* Building structures, factory frameworks, bridges, foundation pit support, shelving uprights.

**Pipe and Tube Products:** Seamless steel pipes, straight-seam welded pipes (ERW), spiral welded pipes (SSAW), galvanized pipes, square and rectangular tubes. *Applications:* Fluid conveyance, petrochemical industry, structural steel support, scaffolding.

**Bar and Wire Rod Products:** Deformed bars (rebar), round bars, wire rods. *Applications:* Concrete reinforcement, mechanical processing, manufacturing of standard fasteners.

II. Common International Standards and Material Grade Equivalents

**GB (National Standard):** China National Standards; common grades include Q235B, Q355B, HRB400E, 20#, and 45#.

**ASTM (American Standard):** American Society for Testing and Materials standards; common grades include A36, A572 Gr50, A53 Gr.B, and A500 Gr.B.

**JIS (Japanese Standard):** Japanese Industrial Standards; common grades include SS400, SM490A, STK400, and SGP.

**EN (European Standard):** European Standards; common grades include S235JR, S355JR, S275J0, and S355J2.

**BS (British Standard):** British Standards; common grades include B500B, 43A, and 50B. Approximate Material Equivalents (For reference only; not a direct substitute):

Q235B is approximately equivalent to SS400, A36, and S235JR.

Q355B is approximately equivalent to SM490A, A572 Gr50, and S355JR.

20# Steel is approximately equivalent to A106 Gr.B and S20C.

III. Common Product Specification Formats

H-Beams: Specified as Height × Width × Web Thickness × Flange Thickness. For example: HW 200×200×8×12 (Height: 200mm; Width: 200mm; Web: 8mm; Flange: 12mm). Common lengths are 6m, 9m, and 12m.

Square and Rectangular Tubes: Square tubes are specified as Side Length × Side Length × Wall Thickness; rectangular tubes are specified as Long Side × Short Side × Wall Thickness. For example: 100×100×5.0mm; 150×80×6.0mm. Common lengths are 6m, 9m, and 12m.

Hot-Rolled Coils/Sheets: Specified as Thickness × Width. For example: 3.0×1250mm (Thickness: 3mm; Width: 1250mm). The weight per coil typically ranges from 15 to 30 tons.

Deformed Steel Bars (Rebar): Specified by their nominal diameter. For example: 12mm, 16mm, 20mm, 25mm, 32mm. Corresponding US Standard designations: #3 (9.5mm), #4 (12.7mm), #5 (15.9mm), #6 (19.1mm), #8 (25.4mm).

IV. Key Quality Inspection Points

Chemical Composition Inspection: Conducted via spectroscopic analysis and cross-verification against the Mill Test Certificate (MTC) to ensure there is no mixing of steel grades.

Dimensional Tolerance Inspection: Measurements taken using calipers, micrometers, and tape measures, referencing standards such as ASTM A6, GB/T 709, and EN 10034.

Surface Quality Inspection: Visual inspection to ensure the absence of cracks, scabs, folds, or severe corrosion. Mechanical Property Testing: Tensile and bending tests are conducted to ensure that yield strength, tensile strength, and elongation meet the required standards.

Weight Verification: Verification is performed either by weighing (determining actual weight) or via theoretical calculation; the deviation between the actual weight and the theoretical weight must fall within the permissible tolerance range.

Plating/Coating Inspection: Coating thickness is measured using a thickness gauge; third-party salt spray testing may also be commissioned. For galvanized coatings, requirements adhere to ASTM A123 standards, mandating a minimum coating weight of 505 g/m².

V. Export Packaging and Sea Freight Considerations

Standard Sea Freight Packaging: Bundles are secured using steel straps or iron wire, with each bundle weighing no more than 3 tons. Corner protectors are inserted between the steel straps and the steel material to prevent indentation marks. The entire bundle is wrapped in PE rain-proof film, with edges reinforced for added protection.

Enhanced Packaging (Recommended for voyages exceeding 45 days or for destinations in high-salinity/coastal regions): Includes the addition of VCI (Vapor Corrosion Inhibitor) anti-rust paper wrapping; exposed cut ends are sprayed with anti-rust oil; and the bundles are enclosed in fully sealed waterproof bags or fitted with sheet metal corner guards.

Shipping Marks (Marks & Nos.): Must clearly display the product specifications, applicable standards, furnace/batch number, net/gross weight, and destination. It is recommended to include cautionary labels such as "Keep Dry," "Do Not Use Hooks," and "Center of Gravity."

VI. Quick Reference: Frequently Asked Questions

Q: What is the difference between hot-rolled coils and cold-rolled coils?

A: Hot-rolled coils feature a rougher surface finish, wider thickness tolerances, and a lower price point; they are primarily used for structural components. Cold-rolled coils feature a smooth surface finish, high dimensional precision, and superior strength; they are suitable for stamped parts, appliance casings, and automotive components.

Q: What is the difference between fixed-length and random-length materials?

A: Fixed-length refers to material cut and delivered in specific, uniform lengths (e.g., 12 meters); this option carries a higher price point and is typically used in standardized construction projects. Random-length refers to material supplied in varying lengths (e.g., a mix of lengths ranging from 5 to 11 meters); this option is more economical and is suitable for projects where precise length requirements are not strictly mandated.

Q: Can you arrange for third-party inspections?

A: Yes. We can arrange for pre-shipment inspections to be conducted by independent agencies such as SGS, BV, or Intertek. The costs associated with such inspections are subject to negotiation between both parties.

Q: What is the Minimum Order Quantity (MOQ)?

A: For standard products, the minimum order quantity is one 20-foot container (approximately 20–25 tons). We also support mixed-load shipments, allowing you to combine multiple product specifications within a single container.