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Help CenterSteel Billet & Square Steel Billet，A36、A572、ST37、ST52、S235JR、S355JR
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Steel Billets – Full Product Details
Steel billets are solid semi-finished products formed by solidification of molten steel from steelmaking furnaces through continuous casting or mold casting. As the core raw material for rolling various steel products (profiles, plates, pipes, etc.), their quality directly determines the performance of subsequent finished steels. Delivery time: 5–7 working days.
1. Product Definition & Production Process
Steel billets are solid steel materials with fixed cross-sectional shapes formed by cooling and solidifying liquid molten steel, serving as a key intermediate product connecting steelmaking and steel rolling in the iron and steel industry chain.The mainstream production process is continuous casting: refined molten steel is poured into a tundish, rapidly solidified in a mold, straightened, cooled, and treated with electromagnetic stirring before being cut to fixed lengths. This process features high production efficiency, uniform internal structure, and excellent surface quality, making it the dominant method in modern steel production.
2. Product Classification
(1) By Cross-sectional Shape
Square BilletSquare cross-section, commonly sized 120×120mm, 150×150mm, 165×165mm, 200×200mm, etc. Mainly used for rolling deformed steel bars, round bars, wire rods, angle steels, channel steels and other section steels.
Rectangular BilletRectangular cross-section, commonly sized 150×330mm, 150×380mm, 150×505mm, 165×380mm, etc. Mostly used for rolling H-beams, I-beams and other large section steels.
SlabWide and flat rectangular cross-section, thickness 165–240mm, width 420–1530mm, length 3700–10000mm. Mainly used for rolling medium and heavy plates, hot-rolled coils, cold-rolled substrates and other flat steel products.
Round BilletCircular cross-section, diameter ranging from 50mm to 800mm, commonly φ150mm, φ200mm, φ380mm, φ450mm, etc. Specially used for rolling seamless steel pipes, shaft forgings and other round steel products.
Shaped BilletSpecial cross-sectional shapes (such as H-shape, I-shape), directly used for rolling corresponding shaped steel products to reduce subsequent processing procedures.
(2) By Material & Steel Grade
Mild Carbon Structural Steel BilletsLow carbon content, cost-effective with good weldability and workability. Typical grades: Q195, Q215, Q235, Q275, SS400, etc. Used in building structures, general mechanical parts, welded components.
High-quality Carbon Structural Steel BilletsStrict composition control, low impurities, balanced strength and toughness. Typical grades: 08Al, 15Mn, 20#, 35#, 45#, 40Mn, 50Mn, etc. Used for manufacturing gears, shafts, connecting rods, molds and other precision mechanical components.
High-strength Low-alloy Steel BilletsAlloyed with Mn, V, Nb and other elements, higher strength than mild steel with good ductility and weldability. Typical grades: Q345 (Q355), Q420, STK500, SS540, etc. Applied in bridges, ships, pressure vessels, engineering machinery, high-rise buildings and other load-bearing structures.
Billets for Deformed Steel BarsSpecially used for producing rebar. Typical grades: HRB400, HRB500, SD390, SD400, etc. Featuring high strength and high elongation to meet seismic and structural requirements in construction.
Special Steel BilletsIncluding alloy structural steel, stainless steel, bearing steel, tool steel, such as 20Cr, 40Cr, GCr15, 304/316 stainless steel billets. Used in high-end equipment, automobiles, aerospace, chemical anti-corrosion and other fields.
(3) By Production Process
Continuously Cast Steel BilletProduced via continuous casting, with dense internal structure, uniform composition and few surface defects. Accounts for over 95% of the market as the mainstream product.
Mold-cast Steel BilletProduced by traditional mold casting, suitable for small-batch, special-sized or high-alloy steel grades, with limited application at present.
3. Product Specifications & Dimensional Tolerances
(1) Square & Rectangular Billets
Section size: square billets 120×120mm ~ 200×200mm; rectangular billets 150×330mm ~ 165×505mm
Length: 6m, 9m, 12m (custom cut lengths available per customer request)
Tolerances: side deviation ±1.0 ~ ±3.0mm; diagonal deviation 3.5 ~ 8.0mm; length deviation ±200mm
(2) Slabs
Thickness: 165–240mm, tolerance ±3.0mm
Width: 420–1530mm, tolerance ±2.0 ~ ±20mm
Length: 3700–10000mm, tolerance ±500mm
(3) Round Billets
Diameter: 50–800mm, tolerance ±0.5 ~ ±5.0mm
Length: 3–12m, customizable per order
4. Technical Requirements & Quality Standards
(1) Applicable Standards
Chinese National Standards: GB/T 13304.1, GB/T 13304.2, GB/T 699, GB/T 1591, GB/T 3077, etc.
International Standards: ASTM, JIS, EN, DIN, etc., customizable according to customer requirements.
(2) Chemical Composition
Strict control of C, Si, Mn, S, P and alloying elements to ensure matching strength, ductility, toughness, weldability and other properties. Each steel grade has its specified composition range, e.g., carbon content ≤0.22% for Q235, ≤0.20% for Q345.
(3) Internal Quality
Free from internal defects such as shrinkage cavities, porosity, inclusions and segregation; internal structure optimized via electromagnetic stirring and soft reduction in continuous casting.
Qualified macrostructure inspection and qualified grain size to ensure stable rolling performance.
(4) Surface Quality
Free from cracks, scabs, folds, bubbles, scratches and other defects; minor local defects repairable.
Smooth corner transitions for square/rectangular billets, flat side surfaces for slabs without obvious irregularities or deformation.
5. Product Applications
Construction IndustrySquare billets rolled into rebar, round bars, angles, channels for buildings, bridges, tunnels, subways; slabs rolled into medium and heavy plates for construction steel structures, floor slabs, curtain wall supports.
Machinery ManufacturingHigh-quality carbon and alloy steel billets rolled into round bars and forgings for shafts, gears, connecting rods, hydraulic parts, molds, engineering machinery parts.
Automotive IndustryHigh-strength low-alloy and special steel billets used for automobile frames, chassis, transmission shafts, hubs, engine components to meet lightweight and high-strength requirements.
Petrochemical IndustryRound billets rolled into seamless pipes for oil and gas transmission, pressure vessels, boilers, anti-corrosion equipment; stainless steel billets for corrosion-resistant pipelines and fittings.
Transportation IndustrySlabs rolled into ship plates, automotive sheets, container plates; shaped billets rolled into railway H-beams and wheel billets for ships, automobiles, rail transit equipment.
Other FieldsUsed for forging various hardware, fasteners, flanges, valves, as well as core blank materials for wind power, nuclear power, aerospace and other high-end equipment.
6. Packaging, Transportation & Storage
Packaging: Bundled by fixed length, 2–5 tons per bundle, securely strapped with product tags indicating steel grade, specification, heat number, batch number, weight and manufacturer.
Transportation: Transported by road, rail or sea; avoid collision and dropping during transit to prevent surface damage and deformation.
Storage: Stored in dry, ventilated warehouses or covered yards, supported by wooden sleepers; kept away from corrosive substances such as acids, alkalis and salts to prevent rust and corrosion.
7. Delivery & Services
Delivery Time: Shipment arranged within 5–7 days after order confirmation; priority production can be coordinated for urgent orders.
Quality Assurance: Each batch supplied with a Mill Test Certificate including chemical composition, mechanical properties and inspection results, conforming to national standards and customer technical agreements.
Customization: Special sizes, steel grades and fixed lengths available upon request; technical consultation and after-sales quality tracking provided.
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