Product Introduction

Engineered for heavy-duty structural framework, automotive manufacturing, and industrial fabrication, our KW ASTM Hot Rolled Steel Flat Bar Series offers exceptional mechanical strength and versatile customization. Manufactured in China under strict ASTM standards, this product line covers structural non-alloy steel grades (including ASTM A572 Grade 50, Q235, Q195, Q345) as well as premium 304 and 316 stainless steel variants.

With a massive thickness range from 0.3mm to 800mm, a precise dimensional tolerance of ±5%, and fully customizable widths and lengths, these hot-rolled flat bars deliver dependable load-bearing capability. Supported by third-party inspection, sample testing, and a fast 15–21 day production lead time, our flat bars are the preferred supply choice for global steel stockists, construction contractors, and OEM equipment builders.

Technical Specifications

Key Features

Wide Thickness Spectrum (0.3mm–800mm): Versatile manufacturing capabilities capable of supplying ultra-thin strip shapes up to heavy structural slab bars.

Superior Mechanical Toughness: Hot-rolling process optimizes grain structure, delivering high yield strength and fatigue resistance across ASTM A572 Gr50, Q235, and Q345 grades.

Full Sizing & Pattern Customization: Widths, cut lengths, and surface embossing/patterns can be customized according to precise client drawing requirements.

Strict Quality & Inspection Standard: Complies with ASTM specifications with ±5% tight dimensional tolerance; full third-party testing (SGS, BV) supported before dispatch.

Sample Testing & Rapid Turnaround: Free/discounted sample support available, backed by a fast 15–21 day delivery lead time for FCL shipping.

Applications

Structural Steel Construction: Building frameworks, bridge girders, warehouse trusses, and heavy equipment support columns.

Automotive & Transportation: Chassis frames, trailer floor beams, bracket supports, and heavy vehicle structural members.

Signage & Outdoor Infrastructure: Highway signpost framing, billboard structural supports, and utility tower crossarms.

General Engineering & Machining: Machine tool bases, worktable frames, custom brackets, and industrial flanges.

Why Choose Us

Factory-Direct Capacity: Massive monthly production output optimized for bulk B2B shipments with a standard 27-ton container MOQ.

Extensive Material Grade Inventory: Complete supply options spanning non-alloy carbon steels (Q235, Q345) to corrosion-resistant stainless steels (304, 316).

Transparent Quality Verification: Full support for pre-shipment sample approval and chemical/mechanical third-party laboratory inspections.

Reliable Global Logistics: Standardized packaging prevents deformation during transit, ensuring on-time 15–21 day jobsite delivery.

OEM / ODM Services

We offer comprehensive customized steel processing solutions tailored for global importers and project contractors:

Custom Sizing & Shearing: Precision cut-to-length shearing, custom width slitting, and beveling.

Surface Treatments & Patterns: Surface shot blasting, anti-rust oil coating, painting, and custom pattern embossing.

Custom Packaging: Export-worthy steel bundling, moisture-proof wrapping, and custom shipping mark tags.

FAQ

Q1: What steel grades are offered in this hot-rolled flat bar series?

A1: We supply non-alloy structural carbon steel grades including ASTM A572 Grade 50, Q235, Q195, and Q345 (GR50 A36 model), as well as 304 and 316 grade stainless steel.

Q2: What is the Minimum Order Quantity (MOQ) for bulk purchases?

A2: The standard Minimum Order Quantity (MOQ) is 27 Tons (equivalent to one standard 20ft container load).

Q3: What thickness and size customization options are available?

A3: We offer a thickness range from 0.3mm to 800mm, with custom widths and cut lengths manufactured to your exact engineering specifications.

Q4: Do you provide samples and support third-party quality inspections?

A4: Yes! Sample requests are supported, and we fully support third-party pre-shipment inspections (such as SGS or BV) to verify tolerances and chemical composition.

Q5: What is the standard production delivery time?

A5: The standard delivery turnaround time is 15 to 21 days from order confirmation and deposit receipt.