Hot-Wrought 4140 Bar
Round bar with as-rolled steel surface and defined length for machining and heat-treatment preparation.
Global Steel Supply & Processing
SAE / AISI 4140 · UNS G41400 · ASTM A322
Source 4140 Cr-Mo alloy steel bar for shafts, drive components and machined parts. Send your bar size, heat-treatment condition, quantity and destination port for a factory quotation.
Review grade and bar specifications ↓Confirm the bar size, supply condition and inspection requirements that belong on your RFQ.
| Steel grade | SAE / AISI 4140 |
| UNS designation | G41400 |
| Alloy family | Chromium-molybdenum low-alloy steel |
| Standard grade bars | ASTM A322-24 (hot-wrought alloy steel bars) |
| General hot-wrought requirements | ASTM A29/A29M-23, where invoked |
| Quenched & tempered bar | ASTM A434/A434M-24 when ordered to an applicable strength class |
| Product shapes | Round bar; square, hexagonal or flat sections subject to availability |
| Supply conditions | Hot-wrought, annealed, normalized or quenched & tempered as agreed |
| Diameter & length | Requested size list; stock and production availability confirmed per quotation |
| Tests & documents | Heat analysis, diameter checks, mechanical properties and MTC as specified |
Review the bar surface and end profile to choose a suitable product form for machining or heat treatment.
Round bar with as-rolled steel surface and defined length for machining and heat-treatment preparation.
Controlled surface finish and diameter requirements for precision component manufacturing.
View actual cross-sections, bar diameter and straight cut ends before choosing a bar stock form.
Review the Cr-Mo alloy composition before specifying testing requirements and heat-analysis documentation.
| Element | Reference mass fraction |
|---|---|
| Carbon (C) | 0.38–0.43% |
| Manganese (Mn) | 0.75–1.00% |
| Silicon (Si) | 0.15–0.35% |
| Chromium (Cr) | 0.80–1.10% |
| Molybdenum (Mo) | 0.15–0.25% |
| Phosphorus (P) | ≤0.035% |
| Sulfur (S) | ≤0.040% |
Reference ranges for SAE 4140 / UNS G41400. The specified ASTM/SAE edition, applicable check-analysis rules and the supplied heat certificate govern acceptance.
Chromium and molybdenum are used to develop hardenability in 4140. The section diameter and treatment route influence the resulting strength and hardness.
Specify heat treatment, size and the required acceptance values together so the quoted material matches your component requirements.
| Supply Condition | Buyer Specification |
|---|---|
| Hot-wrought | Grade chemistry, diameter, surface and any additional hardness or strength acceptance requirements |
| Annealed | Annealed condition, hardness target, section size and machinability requirements |
| Normalized | Defined normalizing treatment, dimensional scope and requested tensile properties |
| Quenched & tempered (Q&T) | Strength class or specified yield, tensile, hardness and impact tests under the agreed contract |
Strength values vary substantially with treatment and diameter. ASTM A434/A434M includes specific Q&T strength classes and size limitations.
For shafts, couplings and loaded components, indicate your requested heat treatment and inspection conditions. This gives your procurement team a consistent basis for price and quality comparison.
Review closely related Cr-Mo alloy grades against the governing material standard, chemistry and required heat-treatment condition.
Chromium-molybdenum low-alloy steel used as machining and heat-treatment stock for medium- and heavy-duty parts.
4340 is a nickel-chromium-molybdenum grade. 42CrMo is a related GB designation. Each uses its own specifications and acceptance rules.
Your purchasing team can coordinate material grade, bar dimensions, inspection and export delivery with one steel supply contact.
Our actual annual steel output reaches 8 million metric tons across our complete product range.
Manufacturing ↗Our regular company-wide steel inventory reaches 1 million metric tons. Your specific 4140 diameter and condition are confirmed per RFQ.
Steel Inventory ↗Include the bar grade, hardness or strength targets, heat identification and inspection scope in your purchase enquiry.
Quality Control ↗Discuss bar sizes, length, bundled weight, packing preferences and destination port with our team.
Contact Sales ↗4140 is commonly selected for heat-treated and machined parts. Your drawing controls the required grade, condition and finished component dimensions.
Cr-Mo steel bar starting stock for loaded rotating shafts and drive parts.
Round stock for machined spindle, axle and mechanical shaft components.
Bar blanks for toothed components requiring a specified machining and treatment route.
Machining stock for power transmission hubs and couplings.
Solid steel bar for mechanical rods and load-bearing equipment components.
Torsion-related and high-load machinery components produced to drawings.
Estimate material weight from solid round bar diameter, cut length and quantity before requesting freight and price details.
Nominal density 7,850 kg/m³. Actual delivery weight and tolerance follow the contracted measurement basis.
Combine grade and machining requirements in one purchase schedule for a more useful factory quotation.
Our company operates at a steel production scale of 8 million metric tons per year across product categories. Submit your 4140 bar diameters, supply conditions and order volume for a specific stock or production review.
Send your quantity and size list to check 4140 bar availability by diameter, condition and length. We will review the applicable stock or manufacturing route and confirm shipping arrangements.
Include inspection needs with your RFQ so the quotation and delivery documents can match your component acceptance criteria.
Include finished blank lengths or drawing requirements with your alloy bar order. We can confirm suitable preparation and machining options when quoting your requested diameter and condition.
Specify the shipment volume, lifting requirements and receiving port. Packing and handling arrangements are confirmed against the ordered bar sizes and delivery conditions.
Compare the requested alloy type and manufacturing grade before finalizing your purchasing list.
State SAE / AISI 4140, bar shape and dimensions, and the applicable ASTM material standard such as ASTM A322 for hot-wrought bars. Add delivery and inspection conditions to the RFQ.
Include the requested condition and any hardness, strength or certification targets. The applicable stock and treatment arrangements can be checked against your order.
Provide diameter, length per piece, quantity, delivery state, expected lead time and destination port.
Use diameter and length with a nominal density of 7,850 kg/m³. The on-page calculator estimates kilograms per bar and total metric tons.
Send your required grade, dimensions, quantity and destination. Our team will review the inquiry.