01
ASTM A36 / A36M
Carbon structural steel
Standard specification for carbon structural steel used in riveted, bolted and welded construction.
Carbon Steel — Industrial Product
Black Steel Bar
Hot rolled carbon steel bar supplied to ASTM A36 / EN 10060, black oxide for general fabrication and structural applications.
Indicative priceUSD 580 - 780 / MT
Lead time10 - 20 working days
01
Overview
Black Steel Bar combines low-carbon carbon steel with the cost efficiency of hot rolling and a dark oxide surface for reliable mechanical performance and consistent dimensional control. The mill finish and wide size range make the bar suited to general fabrication, building structures, machinery frames, concrete reinforcement and stamping machining where surface finish is not critical. Supplied to ASTM A36 / EN 10060 with mill test certification per EN 10204 3.1, it supports global procurement across construction and general industrial supply chains.
Key Characteristics
- 01 High Strength Provides high mechanical strength for demanding structural and industrial applications.
- 02 Good Toughness Provides good toughness and resistance to brittle fracture.
- 03 Good Weldability Supports welding using suitable procedures and compatible filler materials.
- 04 Good Formability Supports bending, forming and other fabrication processes with suitable processing conditions.
- 05 Standard Compliance Manufactured and supplied in accordance with the specified material and product standards.
- 06 Third-Party Inspection Third-party inspection can be arranged according to project and procurement requirements.
Typical Applications
- Building & Structural Structural and architectural components for commercial, industrial and high-rise buildings.
- Machinery & Equipment Shafts, gears, housings, frames and other components for industrial machinery and OEM equipment.
- Concrete Reinforcement Reinforcement for concrete foundations, slabs, columns and walls.
- Stamping & Machining Metal forming and machining for stamping, deep drawing, CNC machining and forging operations.
02
Specifications
Numbers in this section correspond to the applicable product standard, formatted for direct use in enquiry and approval documents.
Product specification
- Material
- Carbon steel
- Grade
- A36 / S235JR / SS400
- UNS designation
- K02600
- Product form
- Bar / rod
- Manufacturing method
- Hot rolled / cold drawn
- Surface / condition
- Black
- Cross-section
- Solid round section (standard); square/hex on request
Supply specifications
- Diameter
- 6 - 300 mm (round); custom sections on request
- Length
- 3 - 12 m; cut-to-length on request
- Tolerance
- According to ASTM A484 / EN 10060
- Surface finish
- Black
- Straightness
- <= 2 mm/m
- Marking
- Standard mill marking; customer marking on request
Final supply is confirmed against the project drawing, purchase agreement and the mill test certificate.
Chemical composition
ElementRequirement
C <= 0.25 %
Si <= 0.40 %
Mn <= 1.50 %
P <= 0.040 %
S <= 0.050 %
Fe Balance
Reference: applicable standard Carbon Steel.
Mechanical properties
PropertyRequirement
Tensile strength 400 - 550 MPa
Yield strength (0.2% offset) >= 250 MPa
Elongation in 50 mm >= 23 %
Hardness <= 160 HB
Reference: applicable standard Carbon Steel at room temperature.
Physical properties
PropertyTypical Value
Density 7.85 g/cm³
Elastic modulus 200 GPa
Thermal conductivity 50 W/m·K at 100°C
Electrical resistivity 0.17 μΩ·m
Specific heat 490 J/kg·K
Melting range 1,450 - 1,530 °C
Thermal expansion 11.6 x 10⁻⁶ /°C
Reference: Typical material values, Carbon Steel.
Reference framework
Standards & documentation
The applicable product, dimensional and inspection standards should be confirmed together in the purchase specification.
02
EN 10060
Hot-rolled round steel bars
European reference for hot-rolled round steel bars for general purposes.
03
EN 10025-2
Hot-rolled structural steel products
European reference for hot-rolled weldable structural steel products.
04
JIS G3101
Rolled steel for general structure
Japanese reference for hot-rolled steel for general structure (SS400).
05
GB/T 702
Hot-rolled round and square steel bars
Chinese reference for hot-rolled round and square steel bars.
06
EN 10204
Inspection documents
Defines inspection document types such as 3.1 and 3.2 for metallic product delivery.
03
Capability
From custom dimensions and precision sizing to heat treatment, surface finishing and product-specific processing, Wayland coordinates supply solutions tailored to your requirements.
Cutting
Cut-to-length and custom cutting according to order requirements.
Custom Dimensions
Non-standard dimensions, tolerances and dimensional combinations subject to product and mill capability.
Precision Sizing
Precision sizing and dimensional control for tighter tolerance requirements.
Cold Working
Cold drawing, cold sizing and other cold-working processes where required.
Heat Treatment
Heat treatment according to material, specification and applicable standard.
Surface Finishing
Surface treatment and finishing according to product, specification and application requirements.
Machining
Turning, drilling, milling and other machining operations where required.
Forming
Bending, forming and other shape modification according to drawings or order requirements.
Customization
Custom dimensions, lengths, surface conditions, end preparations and inspection requirements can be supplied according to project specifications. Final capability is confirmed per enquiry based on grade, size range and applicable standard.
04
Quality
Inspection and documentation procedures are coordinated to meet the requirements of the applicable product standard and the project specification.
- Dimensional inspection Geometry, dimensions and tolerances against the applicable standard
- Visual and surface inspection Surface condition, marking and overall appearance
Documents
- Inspection Report
- Chemical analysis Per heat, against the applicable standard
- Mechanical testing Tensile, yield, elongation and hardness
- Non-destructive testing UT, eddy-current, hydrostatic or other NDT as applicable
- Positive material identification PMI for alloy verification when required
Documents
- Mill Test Certificate (MTC)
- Heat number traceability Heat number carried through MTC and product marking
- Third-party inspection coordination SGS / BV / TÜV on request
Documents
- Third-Party Inspection Report
- EN 10204 documentation 3.1 MTC standard; 3.2 on request
Documents
- EN 10204 3.1 Mill Test Certificate
- EN 10204 3.2 Inspection Certificate
- Certificate of Origin
05
Selection
A well-prepared specification is the most efficient defence against clarification cycles.
- 01 Select material & grade
Choose the material grade according to service conditions, performance requirements and applicable standards.
- 02 Define size & supply condition
Specify the required dimensions, surface condition, heat-treatment condition and delivery requirements.
- 03 Confirm standard & requirements
State the applicable product standard, dimensional standard and governing project specification.
- 04 Define inspection & documentation
Confirm inspection, testing, certification and documentation requirements before order placement.
Example procurement specification
A complete specification suitable for enquiry, covering product, technical requirements, certification and delivery terms.
- Product
- Black Steel Bar
- Grade
- A36
- Standard
- ASTM A36
- Dimensions
- Ø 20 mm × Length 6000 mm; Black (As Rolled)
- Condition
- Black (As Rolled); Mill Surface
- Certification
- EN 10204 3.1 Mill Test Certificate
- Quantity
- 20 Metric Tons
- Packaging
- Seaworthy Export Packing
- Incoterm
- CIF Hamburg
06
Logistics
From mill dispatch to destination port, each stage is coordinated with the nominated forwarder and documented against the purchase specification.
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Packaging
Export-suitable packaging with surface and edge protection.
Bundled, wrapped or crated according to product form and transport mode. Outer surface protected with weather-resistant material; ends and edges shielded against transit damage.
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Loading
FCL container for standard sizes; break bulk for oversized cargo.
Container loading via nominated forwarder. LCL and dimensions outside container allowance coordinated against the mill dispatch schedule.
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Documentation
Commercial invoice, packing list and certificate of origin.
Mill documentation travels with the shipment. EN 10204 3.1 / 3.2 certificates and third-party inspection reports provided as per purchase specification.
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Shipment
Sea freight as standard; alternative routes on request.
FCL / LCL container shipment or break bulk for oversized dimensions. Logistics coordinated through the nominated forwarder.
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Delivery
FOB · CFR · CIF · FCA · EXW arrangements available.
Incoterm 2020. Port of loading: Shanghai / Ningbo / Shenzhen. Final destination and terms confirmed per enquiry.
07
FAQ
Most enquiries reduce to a small set of recurring technical questions.
01 What is black steel bar?
Black steel bar (also called black bar or hot-rolled black bar) is hot-rolled carbon steel bar with a dark oxide mill scale surface. It is the most economical form of carbon steel bar.
02 What are typical applications?
Black bar is widely used for general fabrication, structural frames, base plates, brackets, machinery parts and welded assemblies.
03 What shapes are available?
Round, square, flat and hexagonal cross-sections are available. Special profiles can be produced on request.
04 What surface finishes can be supplied?
Mill scale (black) is standard. Pickled, oiled, shot-blasted and painted finishes are available.
05 Can bar be cut to length?
Yes. Saw cut to specified length is standard. Bundling weight and piece marking can be customized.