Editorial Technical Reference

Steel Slabs

This page explains how Steel Slabs is classified within Basic Metal Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

Semi-finished steel products with rectangular cross-sections produced through continuous casting or ingot casting processes.

Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Steel Slabs

Definition
Steel slabs are intermediate products in steel manufacturing, characterized by their rectangular cross-sectional shape and substantial thickness. They serve as the primary feedstock for rolling mills that produce flat steel products such as plates, sheets, and coils. Slabs are produced through either continuous casting (where molten steel solidifies into continuous lengths) or traditional ingot casting followed by primary rolling. These semi-finished products typically have thicknesses ranging from 50mm to 300mm and widths from 600mm to 2000mm, with lengths varying based on production requirements and downstream processing needs. The material composition can include carbon steel, alloy steel, or stainless steel, each with specific properties. For carbon steel slabs, carbon content typically ranges from 0.05% to 0.25%, affecting strength and weldability. Slab dimensions such as length (4000–12000 mm), thickness (150–300 mm), width (800–2200 mm), and weight (15–60 t) are critical parameters that must be verified for specific applications. Process parameters like casting temperature (1520–1560 °C), casting speed (0.8–1.6 m/min), secondary cooling water flow (0.5–1.5 L/kg), mold oscillation frequency (100–200 strokes/min), and straightening temperature (900–1050 °C) are essential for quality control. Standards such as ASTM A36/A36M (material grade) and EN 10079 (dimensions) serve as procurement references for the slab itself; ISO 9001 certifies the supplier's quality management system, not the product. Always verify model-specific values and standards with the legal manufacturer or supplier.
Working Principle
Steel slabs are manufactured through metallurgical processes where molten steel is solidified into semi-finished rectangular forms. In continuous casting, liquid steel from the steelmaking furnace flows through a tundish into a water-cooled copper mold, where it begins to solidify. The partially solidified strand is continuously withdrawn through secondary cooling zones until complete solidification occurs, then cut to required lengths. In traditional methods, steel is first cast into ingots, which are then reheated and rolled through primary mills to achieve the slab dimensions. The slab's rectangular geometry provides optimal material distribution for subsequent rolling into flat products.
Common Materials
Carbon Steel, Alloy Steel, Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Carbon ContentRequired0.05–0.25 %0.05–0.25 — For carbon steel slabs; higher carbon increases strength but reduces weldability. For carbon steel slabs; higher carbon increases strength but reduces weldability.ASTM A36/A36M
LengthRequired4000–12000 mm4000–12000 — Custom lengths available; longer slabs reduce handling but require larger transport. Custom lengths available; longer slabs reduce handling but require larger transport.EN 10079
Surface Temperature800–1100 °C800–1100 — Hot charging temperature; below 800°C risks cracking, above 1100°C causes scale formation. Hot charging temperature; below 800°C risks cracking, above 1100°C causes scale formation.
ThicknessRequired150–300 mm150–300 — Thicker slabs for heavy plate; thinner for strip rolling. Thicker slabs for heavy plate; thinner for strip rolling.EN 10079
WeightRequired15–60 t15–60 — Single slab weight; depends on width, thickness, and length. Single slab weight; depends on width, thickness, and length.
WidthRequired800–2200 mm800–2200 — Width range for flat rolling; wider slabs reduce edge trimming. Width range for flat rolling; wider slabs reduce edge trimming.EN 10079
Casting temperature1520–1560 °C1520–1560 °C — Outside this window: Below 1520°C: risk of nozzle blockage; above 1560°C: increased gas porosity and breakouts. Outside this window: Below 1520°C: risk of nozzle blockage; above 1560°C: increased gas porosity and breakouts.
Casting speed0.8–1.6 m/min0.8–1.6 m/min — Outside this window: Too slow: surface cracks; too fast: breakout risk and internal cracks. Outside this window: Too slow: surface cracks; too fast: breakout risk and internal cracks.
Secondary cooling water flow0.5–1.5 L/kg0.5–1.5 L/kg — Outside this window: Insufficient cooling: bulging and cracks; excessive cooling: thermal shock and surface defects. Outside this window: Insufficient cooling: bulging and cracks; excessive cooling: thermal shock and surface defects.
Mold oscillation frequency100–200 strokes/min100–200 strokes/min — Outside this window: Low frequency: sticking; high frequency: oscillation marks and surface defects. Outside this window: Low frequency: sticking; high frequency: oscillation marks and surface defects.
Straightening temperature900–1050 °C900–1050 °C — Outside this window: Below 900°C: cracks; above 1050°C: reduced strength and distortion. Outside this window: Below 900°C: cracks; above 1050°C: reduced strength and distortion.

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 metallic structure providing mechanical properties and formability
    Material: Iron-carbon alloy with controlled chemical composition
  • Surface Scale Part
    Oxide layer formed during heating and rolling processes
    Material: Iron oxides (FeO, Fe2O3, Fe3O4)
  • Alloying Elements Part
    Chemical additives that modify steel properties such as strength, corrosion resistance, and hardenability
    Material: Manganese, silicon, chromium, nickel, molybdenum, vanadium, etc.
  • Inclusions Part
    Non-metallic particles within the steel matrix affecting mechanical properties
    Material: Oxides, sulfides, silicates, and other non-metallic compounds

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Steel Slabs.

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

What Decides the Award
  • What is the maximum slab width and thickness you can produce, and what is the corresponding casting speed?
  • What is your typical production capacity in tonnes per month, and how does it scale with slab size?
  • What is your internal defect rate (e.g., cracks, inclusions) and how do you ensure quality through online inspection?
  • Can you supply slabs with a specified carbon equivalent (CEV) for welding applications?
  • What is your delivery lead time for standard and custom sizes?
  • Do you offer hot charging or hot direct rolling options to reduce energy consumption?
  • What certifications do you hold (e.g., ISO 9001, API, CE) and can you provide material test certificates?
Failure Modes & Inspection
  • Surface cracks
    Check: Visual inspection and eddy current testing on the slab surface.
  • Internal cracks
    Check: Ultrasonic testing to detect internal discontinuities.
  • Center segregation
    Check: Macro-etching of cross-section samples to reveal segregation patterns.
  • Breakout
    Check: Monitoring mold temperature and breakout detection systems; visual inspection of solidified shell.
  • Geometric deviations
    Check: Dimensional measurement using laser scanners or manual calipers.

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Thermal fatigue cracking
Cause: Repeated heating and cooling cycles during rolling operations cause expansion/contraction stresses, leading to microcracks that propagate over time, especially at edges and corners.
Surface oxidation and scaling
Cause: High-temperature exposure in furnaces and during hot rolling leads to accelerated oxidation, forming thick, brittle scale layers that can cause surface defects and material loss.
Maintenance Indicators
  • Visible surface cracks or spalling along edges or corners
  • Excessive scale buildup or uneven surface discoloration indicating inconsistent heating
Engineering Tips
  • Implement controlled cooling procedures after hot rolling to minimize thermal shock and residual stresses
  • Apply protective coatings or controlled atmosphere during storage to reduce oxidation and surface degradation

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM A6/A6M - Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling EN 10025 - Hot rolled products of structural steels JIS G 3101 - Rolled steels for general structure

Quoted from the published standard.

Manufacturing Precision
  • Thickness: +/- 0.5mm for slabs up to 50mm thick
  • Length: +/- 20mm for slabs up to 12m long
Quality Inspection
  • Ultrasonic Testing for internal defects
  • Chemical Composition Analysis via Optical Emission Spectrometry

Manufacturers of Steel Slabs

Manufacturer profiles associated with Steel Slabs.

Sourcing Steel Slabs from China?
Tell us your specification and target quantity — we will match it against manufacturer records and come back with the factories that fit.
Request manufacturers We manufacture this

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Supply Chain Commonly Integrated Components

Gas Control System

A system that regulates and controls the flow, pressure, and composition of gases used in molten metal degassing processes.

Explore Specs →
Refractory Lined Ladle

A steel ladle with an interior refractory lining designed to withstand high temperatures and contain molten metal during transfer operations.

Explore Specs →
Reagent Injection System

A system designed to precisely inject desulfurization reagents into molten metal within a desulfurization reactor

Explore Specs →
Lance Manipulator

A mechanical device designed to precisely position, insert, and retract desulfurization lances into molten metal during the desulfurization process.

Explore Specs →

Frequently Asked Questions

What are the typical dimensions of steel slabs?

Steel slabs typically have thicknesses ranging from 150 to 300 mm, widths from 800 to 2200 mm, and lengths from 4000 to 12000 mm, as per EN 10079. However, these values are reference ranges and must be confirmed for specific applications.

What materials are steel slabs made from?

Steel slabs can be made from carbon steel, alloy steel, or stainless steel. For carbon steel, the carbon content typically ranges from 0.05% to 0.25%, affecting strength and weldability.

What standards apply to steel slabs?

Common standards include ASTM A36/A36M for carbon steel, EN 10079 for dimensions, and ISO 9001 for quality management. These are procurement references; compliance must be verified with the supplier.

What are key process parameters in slab casting?

Key parameters include casting temperature (1520–1560 °C), casting speed (0.8–1.6 m/min), secondary cooling water flow (0.5–1.5 L/kg), mold oscillation frequency (100–200 strokes/min), and straightening temperature (900–1050 °C). These affect quality and must be controlled.

Data Basis

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

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.
Buyer enquiry

Request manufacturing insight for Steel Slabs

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What we don't claim
A listing is not an endorsement. Qualify every supplier and verify every figure yourself before ordering.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at contact@cnfx.com.

Need to Manufacture Steel Slabs?

Compare manufacturer profiles with relevant product and process capability.

Previous Product
Slag Conveyor
Next Product
Submerged Entry Nozzle (SEN)
Get QuotesChat