Steel Blooms

Product Specifications

Technical details and manufacturing context for Steel Blooms

Definition

Steel blooms are intermediate products in steel manufacturing, produced by continuous casting or ingot casting processes. They have rectangular cross-sections with dimensions typically ranging from 150x150 mm to 400x400 mm, larger than billets but smaller than slabs. Blooms serve as the primary feedstock for rolling mills to produce structural sections, rails, bars, and other finished steel products through hot rolling processes. In the directory, steel blooms are categorized under Basic Metal Manufacturing as a material product type. The listed parameters provide reference ranges for cross-sectional width and height (150–300 mm), length (4000–12000 mm), weight per meter (180–700 kg/m), carbon content (0.05–0.25%), surface temperature (20–60 °C), tensile strength (400–600 MPa), yield strength (235–355 MPa), dimensional tolerance (±2 mm), straightness (≤3 mm/m), surface quality (≤2 mm), and ultrasonic inspection (100%). These values are typical ranges and must be verified for specific grades and applications. Standards such as GB/T 702, ASTM A29, ASTM A370, and ASTM A388 are referenced for dimensional, composition, mechanical testing, and inspection procedures. However, listing a standard does not imply certification or compliance; buyers should confirm with the supplier. Steel blooms are available in carbon steel, alloy steel, and low-alloy steel. The working principle involves continuous casting or ingot casting followed by primary rolling. For selection, consider required cross-section, length, steel grade, and mechanical properties. Verification questions include checking dimensional tolerances, surface quality, and ultrasonic inspection reports. Maintenance signals include surface defects or dimensional deviations. Failure boundaries are defined by the specified mechanical properties and inspection criteria.

Working Principle

Steel blooms are produced through continuous casting where molten steel from the steelmaking furnace is poured into a water-cooled copper mold. As the steel solidifies, it forms a continuous strand with a rectangular cross-section. The strand is cut into predetermined lengths to create individual blooms. Alternatively, blooms can be produced by pouring molten steel into ingot molds, allowing it to solidify, then reheating and rolling the ingots into bloom dimensions through primary rolling mills. The process ensures a uniform cross-section and internal soundness, which are critical for subsequent hot rolling into finished products.

Common Materials

Carbon Steel, Alloy Steel, Low-alloy Steel

Technical Parameters

Parameter	Typical range	Notes & selection driver
Cross-sectional WidthRequired	150–300 mm	Width dimension of the bloom cross-sectionGB/T 702
Cross-sectional HeightRequired	150–300 mm	Height dimension of the bloom cross-sectionGB/T 702
LengthRequired	4000–12000 m	Standard length of individual bloom pieces
Weight per MeterRequired	180–700 kg/m	Theoretical weight per linear meter based on cross-sectional area and steel density
Carbon ContentRequired	0.05–0.25 %	Percentage of carbon in the steel compositionASTM A29
Surface Temperature	20–60 °C	Temperature of bloom surface during production and handling
Tensile Strength	400–600 MPa	Varies with steel gradeASTM A370
Yield Strength	235–355 MPa	Minimum yield for structural gradesASTM A370
Dimensional Tolerance	±2 mm	On width and heightGB/T 702
Straightness	≤3 mm/m	Maximum deviation per meterGB/T 702
Surface Quality	≤2 mm	Max depth of surface defectsGB/T 702
Ultrasonic Inspection	100 %	Full volumetric inspectionASTM A388

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Steel Matrix Part
Primary structural material providing mechanical properties and formability

Material: Carbon steel or alloy steel with specific chemical composition
Surface Scale Part
Oxide layer formed during hot working that protects underlying steel from further oxidation

Material: Iron oxides (FeO, Fe2O3, Fe3O4)
Identification Markings Part
Painted or stamped markings indicating grade, heat number, and production details

Material: Heat-resistant paint or stamped indentations
Protective Coating Optional Part
Optional coating applied to prevent corrosion during storage and transportation

Material: Anti-corrosion oil or temporary protective coatings

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Steel Blooms.

Manufacturers of Steel Blooms

Manufacturer profiles associated with Steel Blooms.

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Frequently Asked Questions

What are steel blooms used for?

Steel blooms are used as feedstock for rolling mills to produce structural sections, rails, bars, and other finished steel products through hot rolling processes.

What are typical dimensions of steel blooms?

Typical cross-sectional dimensions range from 150x150 mm to 400x400 mm, with lengths from 4000 to 12000 mm. However, exact dimensions should be confirmed with the supplier.

Which standards apply to steel blooms?

Standards such as GB/T 702 for dimensions, ASTM A29 for composition, ASTM A370 for mechanical testing, and ASTM A388 for ultrasonic inspection are referenced. These are verification references, not proof of compliance.

How are steel blooms produced?

Steel blooms are produced by continuous casting or ingot casting. In continuous casting, molten steel is poured into a water-cooled mold, solidified, and cut to length. In ingot casting, ingots are reheated and rolled to bloom dimensions.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Not applicable (solid product, not fluid)
other spec:	Cross-sectional dimensions: Typically 150x150mm to 400x400mm, Length: 6-12m standard, Weight: 2-20 tons
temperature:	Ambient to 1200°C (during hot rolling processes)

Product Specifications

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Application Fit & Sizing Matrix

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