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PRODUCT DESCRIPTION
AISI 1045 sits in the practical middle ground of carbon steels. In the shop, it behaves predictably: chips break consistently, vibration is easier to control, and the final surface is easier to bring to spec. In cold-finished condition, a light oil film and smooth skin help your first pass cut without tearing. In hot-rolled condition, the black mill scale takes the abuse during roughing while keeping your raw-material cost lean. When you step up to TGP 1045 round bar, the bar feels straight and true in the hand; it rolls with a quiet, even sound on a flat table, telling you the OD and straightness are ready for bearing and seal fits with minimal corrective work.
The material’s balanced carbon content provides meaningful tensile and yield strength for duty parts, yet it remains machinable on common lathes and mills without exotic tooling. It can be flame or induction hardened at critical surfaces, making it a solid choice for shafts, pins, and wear points where you want a tough core and a hard skin. From 1045 round bar to 1045 square bar, we supply profiles that keep your BOM simple, your toolpaths shorter, and your takt time predictable.
A short customer story: a mid-size gearbox manufacturer came to us fighting rework on shaft journals. By moving from commodity HR to a TGP 1045 steel bar with specified roundness and size tolerance, they cut journal polishing by 70% and freed a grinder for a different product family. Scrap fell, assembly ran quieter, and inventory turns improved—small changes at the stock level, material impact on the line.
Selecting 1045 is often a line-item decision with downstream cost implications. This table remains exactly aligned to your current PDP so engineering, quality, and procurement can evaluate and sign off without cross-referencing multiple sources. Use it to lock scope in the RFQ stage, then request mill test reports (MTRs) and surface finish callouts in the PO.
| Field | Specification |
|---|---|
| Diameter | 6–25 mm (custom sizes available) |
| Length | 6–12 m |
| Standard | AISI / ASTM / JIS / DIN / GB |
| Grades (equiv.) | 45#, U20452, S45C, SM45C, AISI 1045 (G10450), C45E4, C45E, 1.1191 |
| Technique | Cold Rolled & Hot Rolled |
| Section Shape | Round (flat & square available) |
| Surface | Color / Black / Mill / Polished / Brushed / Galvanized |
| Stock | YES |
| MOQ | 5 tons |
| Processing | Bending, Welding, Punching, Cutting |
| Payment | T/T, L/C, PayPal |
| Typical Applications | Connecting rod, steering arm, truck front axle, driving wheel |
Notes for buyers: include cut-length tolerances, end-finish requirements (saw-cut vs. chamfer), and any special packaging (V-block, wood crating, oil papers) in the inquiry to eliminate back-and-forth and speed approvals.
Cold-finished and TGP bars arrive with tight size and straightness, reducing chatter and taper, improving tool life, and producing smoother finishes. You spend less time chasing microns and more time shipping parts.
1045 provides the step up in tensile and yield strength you expect from a medium-carbon grade, without the machining penalty of higher-alloy steels. It’s a practical ceiling for many shafts, studs, and pins before you need complex heat treatment.
Economical HR for roughing, CF for better surface and strength, and TGP for precision shafting. Buy only the tolerance you actually need—this is the easiest lever to pull on unit cost.
Standard round complemented with square and flat options. Consolidate 1045 bar stock SKUs across product families, shrink slow-moving inventory, and simplify reorder points.
Cutting, bending, welding, and punching under one roof. Single-source the bar and the pre-processing so your first operation on the machine is value-add, not logistics.
Traceable heats, standards alignment across AISI/JIS/DIN/GB equivalents, and clear packaging notes mean faster receiving inspection and fewer NC reports.
These are the common decision vectors buyers rely on across the category. Use them to structure your RFQs and internal approvals.
AISI/SAE: 1045 (G10450)
JIS: S45C
DIN/EN: C45 / 1.1191；variants such as C45E and C45E4
China: 45#Tip: lock the equivalency on the PO and ask for MTRs indicating both melt chemistry and the referenced standard to avoid cross-system confusion.
Typical diameter coverage spans from small diameters for pins to large forgings for shafts; standard stocked range here is 6–25 mm, with custom diameters available on request.
Common lengths are 6–12 m; we also deliver cut-to-length blanks to your fixture length plus allowance.
Procurement checklist: confirm whether pricing is by theoretical weight or actual (scale) weight; define permitted negative tolerance and end-cut style.
HR (black mill): cost-effective for rough machining and weldments.
CR/CF (bright/drawn/peeled): enhanced surface, improved mechanicals, tighter dimensional control.
TGP (turned-ground-polished): centerless ground, straight, and ready for bearings and seals.
Surface choices include black, bright, ground, polished; plating or chrome can be quoted on request for corrosion resistance or wear-facing.
Typical cold-finished 1045 values are in the mid-range for tensile and yield strength with a Brinell hardness suitable for general-purpose duty parts.
Chemistry (typical): Carbon around the mid-0.4x, Manganese in the 0.6–0.9 range, low P and S.
Heat-treat notes: amenable to flame/induction hardening for case surfaces while keeping a tough core; fully hardening requires controlled quench and temper.
See the mechanical properties bar chart above for a quick visual benchmark; always use MTRs for lot-specific design verification.
Machining: predictable chip formation and solid dimensional stability make 1045 a go-to for turning, milling, drilling, and grinding.
Welding/Forming: weldable with proper preheat and procedure control; formability is moderate—engineer bend radii and steps accordingly.
Value-add services: cutting to length, facing/chamfering ends, drilling/punching, bending, surface grinding or polishing, and basic sub-assemblies when required.
Your current in-house menu (bending, welding, punching, cutting) keeps lead time short and logistics simple.
Shafts, axles, and pins where torsional strength and reasonable toughness are needed.
Gears, sprockets, and wear rings that benefit from localized hardening.
Bolts, studs, and tie-rods where mid-range strength meets cost control.
Jigs, fixtures, and general machine components that demand stable machining and reliable finishes.
Documentation: MTRs, heat numbers, and standards references provided on request; specify if third-party inspection or ultrasonic testing is required.
Packaging: export-grade bundling, rust-preventive oil, end-caps or edge protection as needed.
Commercials: MOQ 5 tons, stock on hand, and payment via T/T, L/C, or PayPal. Align Incoterms, freight class, and delivery windows at quote stage.
Our bar program targets the most common shafting diameters and lengths used in transmission and fabrication, minimizing engineering exceptions and speeding purchasing approvals.
We are fluent across AISI/ASTM/JIS/DIN/GB, and we document equivalencies so your multi-site, multi-region production can release the same drawing without re-qualification.
Material plus processing—cutting, bending, welding, and punching—bundled in one PO. That compresses lead time and removes handoffs that typically add risk.
Round as the default, with square and flat 1045 available to streamline your 1045 bar stock library across product lines.
Inventory availability, MOQ, and payment options are explicit. That means fewer surprises and faster quote-to-order conversion for your team.
Clear packaging standards, predictable batch sizes, and pragmatic communication from quote through delivery keep projects on schedule and audit-ready.
1045 is a medium-carbon steel with notably higher tensile and yield strength than 1018. You gain durability for shafts and studs, but welding and forming require tighter procedure control. For parts with frequent welding or deep draws, 1018 can still be the better fit; for rotating parts and fasteners under load, 1045 typically wins on performance.
Yes—specify TGP (turned-ground-polished) 1045 round bar when the shaft interfaces with bearings or seals. You’ll receive straight, round stock that often installs with only a light polish, cutting multiple operations from the route sheet.
It welds acceptably with preheat and controlled interpass temperatures. For critical weldments, confirm procedure qualification records (PQRs) and consider post-weld heat treatment to temper the heat-affected zone and stabilize residual stress.
Common frameworks include AISI/SAE for grade designation and production standards such as ASTM A29/A108 or their equivalents. Global equivalents include JIS S45C, DIN/EN C45/1.1191, and China 45#. State the standard on your PO to lock expectations.
Use HR for economical roughing and weldments, CF for a better surface and tighter consistency in machining, and TGP for precision shafting where OD, roundness, and straightness matter to bearing life and seal performance.
Yes. While round is the default, 1045 square bar and flat bar are available to consolidate stock and simplify fixture setups in prismatic parts.
Diameter/length or cut list, condition (HR/CF/TGP), surface finish, tolerances (OD, straightness, roundness), end finish (saw-cut/chamfered), packaging, standard/equivalence for documentation, quantity by heat if needed, and required certifications or tests (MTR, UT, dimensional reports).
Zhongjing Steel Group (Guangdong) Co.,Ltd. specializes in the production of cold-rolled/hot-rolled coils, carbon steel pipes, bars, and PPGI materials. It is a modern enterprise integrating carbon steel production, processing, and trade. It is a Chinese iron and steel enterprise group.
