Black Annealed Hot Rolled Coil - High-Ductility Steel Coils for Forming & Stamping

Black annealed hot rolled coil represents a specialized category of carbon steel products that undergo thermal treatment to enhance ductility and formability. This material finds extensive application in automotive components, metal furniture manufacturing, and precision stamping operations where superior bending characteristics are essential. Manufactured through controlled annealing processes that eliminate internal stresses, these coils deliver exceptional mechanical properties for demanding fabrication requirements across industrial sectors.

What is Black Annealed Hot Rolled Coil?

Black annealed hot rolled coil is carbon steel coil material processed through subcritical annealing at temperatures between 650-700°C, followed by controlled cooling to achieve a ferritic-pearlitic microstructure. This thermal treatment reduces tensile strength to 270-410 MPa while increasing elongation to 28-38%, creating optimal conditions for cold forming operations without spring-back issues.

Black Annealed Hot Rolled Coil Technical Specifications

Standard grades comply with ASTM A1008/A1008M for commercial quality, with thickness range of 1.2-6.0mm and width availability from 600-1500mm. Carbon content remains controlled at 0.15% maximum per chemical composition requirements, while surface finish maintains Ra values below 3.2μm for consistent coating adhesion in downstream painting processes.

Manufacturing Process & Quality Control

Production begins with hot rolling at temperatures exceeding 1100°C, followed by coiling at 600-680°C to prevent excessive scale formation. The annealing cycle utilizes protective atmosphere furnaces with hydrogen-nitrogen mixtures to minimize surface oxidation. Material test certificates document mechanical properties per ASTM E8 tensile testing protocols, verifying yield strength of 180-280 MPa and uniform elongation characteristics.

Applications Across Industrial Sectors

Automotive manufacturers employ black annealed hot rolled coil for chassis reinforcements, seat frames, and structural brackets requiring complex geometries. The construction industry utilizes this material for roll-formed profiles, metal decking systems, and HVAC ductwork where deep drawing capabilities prevent cracking. Appliance producers specify these coils for washing machine drums, refrigerator panels, and component housings that demand consistent forming behavior without surface defects.

Why Choose Our Black Annealed Hot Rolled Coil

Our manufacturing facility operates continuous annealing lines equipped with rapid cooling sections that achieve grain size control per ASTM E112 standards. Mill-direct pricing eliminates intermediary markups while maintaining ISO 9001:2015 certified quality management systems. Technical support teams provide forming simulation data and tooling recommendations based on specific application requirements, ensuring first-time-right production outcomes.

Frequently Asked Questions

What is the minimum order quantity (MOQ)?

Standard MOQ is established at 20 metric tons per specification to optimize production scheduling and maintain cost-effective pricing structures. Mixed container loads can accommodate multiple thickness-width combinations when total volume meets minimum tonnage requirements, with lead times extending 2-3 weeks for consolidated shipments.

Do you provide material test certificates?

Comprehensive mill test reports accompany each shipment, documenting chemical analysis per ASTM E415 optical emission spectroscopy and mechanical properties from longitudinal test specimens. Certificates include heat number traceability, dimensional tolerances per ASTM A1008 Table 4, and surface quality inspection results verified through visual examination protocols.

What is the typical delivery time?

Standard lead time spans 25-35 days from purchase order confirmation, encompassing production scheduling, annealing cycle completion, and quality verification procedures. Expedited processing reduces delivery to 18-22 days for in-stock thickness-width combinations, with logistics coordination for FOB or CIF delivery terms based on destination port requirements.

Can you cut to custom sizes?

Precision slitting services accommodate width tolerances of ±0.5mm using multi-blade rotary shears, while cut-to-length processing delivers sheets within ±2.0mm length accuracy. Custom blanking operations produce shaped components through progressive die cutting, with edge quality maintained at burr heights below 0.1mm for immediate assembly applications.

Get a Competitive Quote for Black Annealed Hot Rolled Coil

Contact our technical sales team to receive detailed quotations including material specifications, mechanical property guarantees, and logistics solutions tailored to your production requirements. Our application engineers provide forming analysis support and material substitution recommendations to optimize cost-performance ratios for your specific manufacturing processes.