Hot-Rolled Black Coil

1. Product Introduction

Shunchen hot-rolled black coil is a mainstream raw material for steel deep processing. It is manufactured by heating continuous casting slabs, rolling into steel strips on professional hot rolling mills and then coiled for delivery. A natural blue-black oxide scale is formed on the surface during hot rolling, so no extra surface coating is required.

Shunchen maintains full-range specifications covering multiple steel grades and complete size series. Supported by mature deep processing workshops, the products can be slit, leveled, cut and bent to produce various structural profiles, mechanical parts and welded pipes. The materials are highly compatible with automated production lines, covering diverse industrial processing scenarios. We accept bulk orders, customized requirements and long-term framework cooperation, delivering reliable products and full supporting services for global purchasers.

2. Core Advantages & Selling Points

2.1 Natural Oxide Layer for Good Anti-Rust Performance

· The compact hot-rolled oxide layer forms firm physical protection for steel substrate

· Better rust resistance than ordinary cold-rolled sheets under dry and indoor storage conditions

· Suitable for short-term outdoor storage and factory turnover without extra anti-corrosion treatment, lowering overall procurement cost

2.2 Complete Specifications & Wide Adaptability

· Thickness ranges from 1.5 mm to 25.4 mm, covering thin, medium and medium-heavy gauges

· Custom slitting and leveling services are available to match different wall thickness requirements of finished products

· One-stop material supply satisfies raw material demands of multiple production processes, simplifying clients’ purchasing management

2.3 Excellent Processability & Stable Processing Effect

· Low carbon content and low sulfur & phosphorus impurities ensure superior weldability, cold bending and stamping performance

· Dimensional stability remains excellent after laser cutting, bending and welding

· Adaptable to continuous production of automated lines, causing low equipment wear, with scrap rate controlled below 1%

· Stable batch quality guarantees consistent finished product quality for purchasers

3. Technical Specifications

4.1 Main Application Fields

· Building Steel Structure: Raw material for H-beam, I-beam, channel steel, floor and wall base plates of industrial workshops, logistics warehouses and steel bridges

· Machinery & Engineering Equipment: Base plates, chassis and structural parts for construction machinery, agricultural machinery and mining equipment

· Pipe Processing: Raw material for ERW straight-seam pipes, spiral welded pipes, water supply & drainage pipes, gas pipes and piling pipes

· General Welded Components: Various standard welded parts and metal structural accessories

4.2 Typical Success Case

Case 1: Steel Structure Workshop Project in Hebei

The client purchased Q345B grade Shunchen hot-rolled black coil (6 mm thickness, 1500 mm width) to produce H-beam for main workshop frames. With yield strength over 345 MPa and thickness tolerance within ±0.15 mm, the finished parts feature high precision. Workpieces cut by CNC plasma machine have neat edges without secondary repair. Continuous coil feeding matches automated production lines perfectly, cutting material handling cost by 18% and improving overall welding efficiency by 22%. Both sides established stable long-term purchasing cooperation after the project.

Case 2: Agricultural Machinery Manufacturing Project in Shandong

A local machinery manufacturer placed bulk orders for SPHC grade materials (4 mm thickness, 1250 mm width) to produce rotary tiller frames. The material has good plasticity with fracture elongation above 22%. No cracking or deformation occurs after laser cutting and bending. Continuous coil feeding raises single-shift output by 28% and reduces material waste by 15%. The client has kept regular bulk procurement from Shunchen for years.

Case 3: Water Supply & Drainage Pipe Project in Guangdong

A pipe manufacturer adopted Q235B grade Shunchen products (4 mm thickness, 1000 mm width) to manufacture DN150 welded pipes for building water supply and drainage. The material achieves high slitting precision with edge burr below 0.1 mm. Weld strength is consistent with base metal after high-frequency welding, with no porosity or incomplete welding. The first-pass qualification rate of hydrostatic test reaches 99.6%. Continuous feeding greatly reduces line downtime for material replacement, and the client regards Shunchen as a core strategic supplier.

5. Certification & Quality Assurance

5.1 Qualification Certifications

· Fully complies with GB/T709-2019, GB/T3274-2017 and JIS G3101 standards

· Shunchen provides complete factory inspection reports and quality documents for each batch of ordered goods

· Supports third-party testing and international certification as required by purchasers

5.2 Production Quality Control

· Raw material incoming inspection: Chemical composition and mechanical property test

· In-process inspection: Dimensional tolerance, surface quality and thickness test

· Finished product sampling inspection: Bending, welding and comprehensive performance test

· Full batch quality traceability system implemented by Shunchen

5.3 After-Sales Guarantee

· Free replacement for products with manufacturing defects

· Shunchen’s professional team provides technical support for material selection and processing advice

· Long-term follow-up on product application performance for all cooperative purchasers

6. Competitive Advantage & Why Choose Shunchen

7. Frequently Asked Questions (FAQ)

Q1: Can you provide slitting and leveling processing service for ordered goods?

A: Yes. Shunchen provides one-stop deep processing including longitudinal slitting, leveling, shearing and custom packaging according to clients’ order requirements.

Q2: Is the material suitable for outdoor long-term use?

A: The standard black oxide surface is fit for short-term outdoor storage. For long-term outdoor service, pickling, phosphating or hot-dip galvanizing treatment is recommended, and we can arrange relevant processing for your orders.

Q3: What steel grades can be supplied for bulk purchase?

A: Shunchen provides SPHC, Q235B, Q345B, SS400 and other conventional carbon steel grades, and supports customization of special high-strength steel for large orders.