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Help CenterSteel Billet，Round Billet: Raw Material for Seamless Tubes and Forged Mechanical Parts.
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Steel Billet，Main Materials Q195, Q235B, Q355B, 20#, 45#, SS400, A36, S235JR,NegotiableMOQ: 1 Metric Ton
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Detailed Specification‑Steel Billet
1.Product Overview
Steel billet is continuous‑cast semi‑finished product from liquid steel. It serves as the upstream raw material for wire rod, rebar, round bar and sectional steel. Major categories include square billet, rectangular bloom and round billet. Adopted standards cover GB/T20112, ASTM and EN specifications. Typical grades include Q235B,45#,SAE1008,82B,S355JR.
2.Classification
2.1 Cross‑section type
1. Square billet: Common dimensions 120×120mm,130×130mm,150×150mm,165×165mm, applied for rebar and high‑carbon wire rod for steel‑strand production.
2. Rectangular bloom: Large‑size blank for heavy‑diameter steel bar and thick structural plate.
3. Round billet: Raw material for seamless tubes and forged mechanical parts.
2.2 Steel‑grade grouping
1. Low‑carbon billet (Q195,Q235B,SAE1008): For ordinary wire and construction rebar.
2. Medium‑carbon billet (45#,S45C): Machining‑purpose solid bar.
3. High‑carbon 82B billet: Exclusive feedstock for prestressed‑steel‑strand wire rod.
4. Low‑alloy billet (S355JR,42CrMo): High‑strength structural and mechanical‑component steel.
2.3 Production process category
Continuous‑cast billet: Cost‑effective bulk‑production grade with steady metallurgical property.
Forged ingot billet: Denser internal structure for premium‑grade forging.
3.Chemical‑composition requirements
Main alloying elements: C,Si,Mn. Ordinary carbon steel: P≤0.035%,S≤0.035%. Low‑impurity grades are supplied for cold‑drawing and cold‑heading applications. Mill test report covers full elemental analysis.
4.Dimensional tolerance and surface standard
1. Section tolerance ±2‑4 mm. Standard lengths range from 6‑12 m or custom cut‑to‑size lengths.
2. Surface condition: No deep cracks, overlaps, scabs or serious pitting. Minor flaws are grindable. Internal quality excludes severe central shrinkage and segregation. UT inspection can be arranged upon buyer’s request.
3. Straightness: Total bend below 0.5% of overall length.
5.Manufacturing process
Converter / electric‑furnace steel‑making → continuous casting → fixed‑length cutting → visual inspection → stacking → shipment.
6.Product merits
1. Consistent chemical composition guarantees stable rolling quality for downstream mills.
2. Uniform grain structure provides good hot‑rolling ductility after furnace heating.
3. Standardised lengths match heating furnace and rolling‑mill design parameters.
4. Strict impurity control suits cold‑forging, drawing and hot‑forging processes.
7.Application scope
1. Rebar mills for building‑construction reinforced steel bar for bridges and civil‑engineering projects.
2. Wire‑rod factories produce 82B wire rod for prestressed steel‑strand manufacturing.
3. Round‑steel mills manufacture alloy‑grade solid bar for mechanical parts.
4. Seamless pipe plants use round billet as tube blank.
5. Auto‑part and construction‑machinery forging factories.
8.Packing, marking and shipment
Steel‑strap bundled. Each bundle bears heat number, steel grade, dimension and net‑weight label. Available lengths:6m,9m,12m. Cargo loaded in bulk containers or bulk‑carrier vessels. Official mill certificate covers heat number, chemical composition and inspection records.
9.Storage & transport
Store on raised ground with waterproof covering to prevent rust. Avoid heavy collision during loading. Keep different heat lots separated.
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