Hot-Sale Cold Drawn Bars & Primary Long Steel Sections
Engineered with accurate dimensional tolerances (h9, h11), high concentricity, and smooth mirror-grade cold-finished surfaces. Select structural, bright bar, and hollow sections stocked year-round for immediate dispatch.
Galvanized Plain Round Bar, High Corrosion Resistance
Solid round bar featuring hot-dip zinc protection and cold calibration for mechanical dowels, brackets, and coastal structural pins.
SAE1080 / Q235 Hot Rolled Wire Rod, 8 mm & 12 mm
Premium feedstock coils strictly controlled for inclusions and scale, engineered for multi-pass continuous cold die drawing.
SAE1006 / SAE1008 Cold Drawn Wire for Nail Making
Uniform tensile consistency and ductility for cold-heading fasteners, wire mesh weaving, and precision secondary forming.
Solid Square Steel Bar for Heavy Machinery
Solid square stock with sharp right-angle edges, consistent yield strength, and balanced grain matrix for fabrication and tooling.
Q235 / Q355 Hot-Dip Galvanized Flat Steel (3–60 mm)
Calibrated shear-cut flat steel with high tensile strength, ideal for base mounting plates, transformer brackets, and earth bonding.
A36 / Q235 Grade H-Beam for Industrial Framing
Wide-flange profiles designed for high moment of inertia, supporting multi-tier gantry cranes, factory skeletons, and civil bridges.
Perforated Galvanized Carbon Steel Angle Bar
Hot-dip zinc equal and unequal angle sections, pre-punched for modular bolted trusses, solar racking, and telecom towers.
Galvanized Channel Steel (U & C Types)
Cold-formed and hot-rolled structural channels for equipment skids, purlins, and heavy-duty chassis cross-members.
Macro-Industry Solutions: The Cold Drawn Metallurgy Advantage
Cold drawing transforms hot-rolled raw bar stock through plastic deformation below the recrystallization temperature. By forcing descaled stock through tungsten carbide dies, the process achieves superior roundness, enhanced yield strength via strain hardening, and eliminates costly machining operations.
Work-Hardening & Yield Elevation
The dislocation density within the carbon ferrite-pearlite matrix increases under extreme die compression. This creates a mechanical uplift in yield strength by 20% to 35% without requiring expensive post-alloy quenching treatments.
- Eliminates thermal distortion caused by heat treating
- Optimizes strength-to-weight ratios in rotating assemblies
- Enhances torsional shear resistance for industrial drives
Precision Diametric Tolerance (ISO h8–h11)
Unlike hot-rolled merchant bar with loose scaling and mill tolerance, cold drawn rounds guarantee tight micrometric tolerances across continuous bar lengths, ready for automatic Swiss-lathes and CNC chucks.
- Guaranteed roundness and concentricity limits
- Zero surface decarburization scale layer
- Direct insertion into sleeve bearings and hydraulic housings
Superior Machinability & Tool Life
By imparting uniform surface hardness and eliminating micro-void inclusions, cold finished round bars produce crisp, continuous chip evacuation during high-speed turning, reaming, threading, and broaching.
- Up to 40% extended carbide cutting-insert longevity
- Significantly reduced cycle times in automated screw machining
- Mirror-smooth finish achieving Ra 0.8–1.6 μm without grinding
Daqiuzhuang Mill Infrastructure: Scaling International Projects
Headquartered in the Daqiuzhuang Industrial Zone, Jinghai District, Tianjin, China—the world’s premier structural and precision steel hub—Tianjin Huizhong Xinyu International Trade Co., Ltd. (HZXY) anchors deep manufacturing capabilities across 1,500 acres of dedicated production facilities in Tianjin and Tangshan.
With an annual steel processing capacity exceeding 10 million metric tons and direct export channels to more than 50 countries across Southeast Asia, the Middle East, Africa, Europe, and the Americas, HZXY delivers structural integrity, certified metallurgical compliance, and risk-free supply chain execution.
Global Metallurgical Cross-Reference & Quality Assurances
Purchasing agents and structural engineers encounter differing international coding systems. HZXY provides fully certified Mill Test Certificates (EN 10204 3.1) with full traceability, chemical spectrometry analyses, and mechanical tensile/elongation reports for every heat batch.
| China (GB/T) | USA (ASTM / AISI) | Europe (EN 10025 / 10277) | Japan (JIS G) | Tensile Strength (MPa) | Min. Yield Re (MPa) | Target Precision Applications |
|---|---|---|---|---|---|---|
| Q235B (Cold Drawn) | ASTM A36 / AISI 1018 | S235JRC / C15E+C | SS400 / SGD400 | 420 - 550 | 280 - 320* | Linkage rods, bushings, mild axles, anchor studs |
| Q355B (GB/T 1591-2018) | ASTM A572 Gr. 50 / 1020 | S355J2C+C | SM490A / S35C | 560 - 680 | 380 - 450* | Heavy hydraulic piston shafts, structural pins |
| 45# Steel (Cold Drawn) | AISI 1045 / SAE 1045 | C45+C (1.0503) | S45C | 630 - 820 | 490 - 560* | Gears, high-stress transmission shafts, spindles |
| 40Cr (Alloy Bar) | AISI 5140 / SAE 5140 | 41Cr4+C (1.7035) | SCr440 | 750 - 980 | 590 - 720* | Heavy-load automotive drive shafts, splines |
| SAE 1008 / 1006 | ASTM A510M 1008 | DC01 / C10C | SWRM8 / SWCH8A | 380 - 480 | 240 - 290* | Cold heading bolts, fasteners, rivets, bent stays |
*Yield values reflect work-hardened cold-drawn mechanical condition for bar diameters ≤ 25mm. Certified chemical verification via optical emission spectroscopy accompanies shipping dossiers.
Critical Applications: Where Precision Round Bars Deliver Value
From ultra-smooth hydraulic cylinders to the load-bearing pins anchoring Beijing’s landmark infrastructure, our cold drawn bars eliminate site failures caused by internal fatigue and eccentricity.
Hydraulic & Pneumatic Cylinders
Precision hard-chrome plating base bars require extreme roundness and uniform micro-finishes to guarantee piston seal containment without pressure bleeding.
High-Precision CNC Machined Shafts
Centerless-ground and cold-finished rounds reduce tool chattering in high-RPM electric motors, agricultural gearboxes, and automated industrial robotic joints.
Automotive Fasteners & Tie Rods
Uniform chemical distribution prevents shear cracking during high-velocity cold heading, thread rolling, and tensile stress installation.
Heavy Bridge & Skyscraper Shear Pins
Supplied directly to mega-projects such as the Jiaozhou Bay Marine Bridge and the Beijing Daxing International Airport for multi-axis seismic joints.
End-to-End Processing: Ready for Global Site Installation
Eliminate mid-stream logistics overhead. HZXY provides custom factory processing on cold drawn bars, sections, coils, and pipes before consolidation and port delivery.
Precision CNC Sawing & Beveling
Tight cut-to-length tolerances (±0.5mm) with mechanical deburring, end-chamfering (30°/45°), and robotic center-hole facing, eliminating wasted container space and scrap metal charges.
Hot-Dip & Continuous Galvanizing
Thermal immersion galvanizing yields uniform zinc barrier coatings from 275 g/m² up to 600 g/m² (ASTM A123 / ISO 1461), ensuring 30+ years of maintenance-free service in corrosive marine environments.
Project Consolidations & Export Packing
Consolidate structural beams, rebar, valves, cold-finished rounds, and PVC drainage into single container bookings, wrapped in heavy VCI anti-corrosion barrier sheeting with radial steel strapping.
Technical Roadmap: Next-Gen Precision Cold Drawing (2025–2030)
In response to international decarbonization targets, stricter tolerance requests for robotic automation, and green building taxonomies, HZXY is pioneering advanced drawn-steel innovations.
Laser Non-Contact In-Line Gauging
Dual-axis automated laser telecentric micrometers continuous-scan bar diameters during drawing to catch and correct micron variances in real time.
Ultrasonic Sub-Surface Flaw Mapping
100% automated immersion ultrasonic and eddy-current testing for critical alloy shafting to verify internal matrix density and avoid seam splits.
Low-Carbon Green EAF Steel Grades
Supplying certified low-embodied-carbon rounds forged from high-ratio scrap electric arc furnaces (EAF) to support international CBAM requirements.
Bio-Polymer Dry Lubricant Dies
Transitioning from traditional phosphate conversion coatings to biodegradable, nano-ceramic dry drawing lubricants to reduce industrial waste.
Frequently Asked Questions: Global Procurement & Export
Everything procurement heads and engineering inspectors need to know about lead times, international logistics, testing protocols, and mill capabilities.
What is the exact metallurgical difference between cold drawn round bar and hot rolled round bar?
Where is HZXY located, and which primary ports handle your export containers and break-bulk?
Which international steel grades, sizes, and chemical standards can HZXY supply?
Do you provide Mill Test Certificates (MTC), and are third-party inspections allowed?
Can project buyers combine different structural steels, pipes, and valves into a single shipment?
What custom fabrication and secondary deep-processing services are conducted in-house?
How can procurement teams request formal quotes, mill schedules, and technical catalogs?
Comprehensive Infrastructure & Structural Steel Catalogue
Pair your cold drawn round bar requirements with verified factory-direct sections, flat coils, industrial fluid handling, and scaffolding systems from the Daqiuzhuang production cluster.
Q235B / Q345B Hot & Cold Rolled Carbon Steel Coil
Hot rolled coil for structural profiling, plus fine-rolled bright cold rolled coils for stamping, automotive pressing, and continuous tubing.
Double-Coated Prepainted Steel Coil (PPGI / PPGL)
High-weatherability fluorocarbon and polyester coated coils in full RAL ranges for architectural roofing and commercial panels.
Galvanized Scaffolding Steel Pipe (BS 1139 / EN 39)
High-yield zinc-coated structural tubing with deburred edges, customized for marine staging, shoring towers, and greenhouse bays.
High-Strength Industrial Anti-Corrosion Pipeline
Epoxy and 3LPE coated steel pipelines engineered for utility gas transmission, municipal water transfer, and refinery loops.
Deformed Steel Rebar (6 mm – 32 mm / HRB400 / HRB500)
High-bonding ribbed reinforcement rebar in standardized tagged bundles for foundation pile caps, slabs, and precast civil structures.
Standard Industrial I-Beam Profiles
High-rigidity vertical and horizontal support beams for overhead gantry tracks, civil mining supports, and bridge platforms.
Pressure-Resistant Gate, Butterfly & Check Valves
Ductile iron and cast steel valves precision-matched to pipe wall dimensions and ANSI/DIN flange drilling specifications.
PVC-U Water Supply & Drainage Building Systems
Complete MEP pipe runs, communication conduit sheathing, and pressure fittings consolidated into combined shipments with steel lots.
Proven Integrity in Mission-Critical Megaprojects
HZXY steel products undergo stringent mechanical validation. Our materials anchor some of Asia’s most iconic transport terminals, long-span marine crossings, and Olympic sporting facilities.
Jiaozhou Bay Marine Bridge
Supplied heavy anti-corrosion galvanized structural steel and anchor tie bars engineered to resist severe saline marine environments.
Beijing Daxing International Airport
Delivered custom cold-finished structural pin connectors, high-strength structural profiles, and primary fluid piping systems.
National Stadium (Bird's Nest)
Provided high-elastic-limit reinforcement steels, load-bearing tie bars, and precision components for the complex curved space-truss.