Industrial Alloy Steel Manufacturer
Round bar supply built for demanding hydraulic, wind, and heavy machinery systems.
We specialize in the manufacturing and supply of alloy steel round bars for global industrial customers, with flexible sizes, stable output, and process support from sourcing to shipment.
Featured grade
42CrMo4 / ASTM 4140 QT
High-strength alloy round bar for shafts, rods, flanges, and powertrain components.
Surface conditions matched to downstream machining and assembly needs.
Delivery conditions selected according to grade, performance target, and application.
Product Focus
Alloy and carbon steel round bars
Typical Use
Hydraulic equipment, wind power, heavy machinery
Supply Scope
Standard grades plus customized processing options
Why Buyers Choose JOTAIN
Four practical reasons industrial buyers keep us on the shortlist.
We combine stable production planning, strict inspection, flexible processing support, and export-ready delivery coordination for repeat industrial demand.
Reliable output planning for ongoing industrial procurement and repeat projects.
Inspection coverage from chemistry and mechanics to UT and dimensional verification.
Diameter, length, heat treatment, and surface finish adjusted to actual use conditions.
Export supply mindset for project schedules, packing control, and clear technical support.
Products Overview
Core grades engineered for strength, toughness, and dependable machining performance.
Our main products include 42CrMo4, 40Cr, CK45 / 1045, 34CrNiMo6, and 35CrMo steel bars used in hydraulic equipment, wind power systems, and heavy machinery.
Flagship grade
42CrMo4 / ASTM 4140 QT Alloy Steel Round Bar
A core quenched and tempered alloy steel grade with high strength, good toughness, and strong fatigue resistance for critical rotating or load-bearing parts.
Alloy structural steel
40Cr
Widely used for shafts, gears, bolts, and automotive or transmission components.
Medium carbon steelCK45 / C45 / 1045
Good machinability and wear resistance for general machinery parts and automotive use.
High toughness alloy steel34CrNiMo6
Built for heavy-duty shafts, gear shafts, oil and gas equipment, and mining machinery.
Cr-Mo pressure grade35CrMo
Used in high-pressure equipment, mechanical shafts, bolts, and petroleum applications.
Applications
Supply aligned with real industrial load cases, not generic catalog claims.
We support OEMs, project buyers, and machining partners looking for steel bars that match demanding service conditions, processing routes, and lead-time expectations.
Hydraulic Equipment
Rods, shafts, and wear-critical components requiring stable mechanical performance.
Wind Power Systems
Transmission shafts and flange parts where fatigue resistance and heat treatment matter.
Heavy Machinery
Gears, spindles, gear shafts, pressure parts, and mining or petroleum components.
Manufacturing Capability
From steel selection to final delivery condition, the process is built for industrial procurement.
We supply round bars with hot rolled, forged, heat-treated, rough machined, and precision machined options, depending on grade and project requirements.
Processing paths selected according to size range, application, and performance target.
QT, annealed, normalized, black, peeled, and machined options for downstream use.
Quality Control
Inspection routines designed to build confidence before your machining line starts.
Quality inspection includes chemical composition analysis, mechanical testing, ultrasonic testing, dimensional inspection, and third-party inspection availability when required.
Heat number, grade, size, and standard linked to each batch before shipment.
Additional inspection support available for projects with higher audit expectations.
About Us
Reliable alloy steel round bar supply for customers who care about consistency, not just price.
We focus on dependable material performance, practical processing support, and export-oriented coordination for repeat industrial orders across global markets.
Communication and shipment support shaped around overseas industrial customers.
Fast support on grade selection, availability, delivery condition, and inquiry response.
