aisi-4140-polished-bright-steel-round-bar.mp4

aisi-4140-polished-bright-steel-round-bar.mp4

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SHANDONG LE REN SPECIAL STEEL CO., LTD.

 8 year year

Product details

AISI 4140 Steel Bar (ASTM A29) – Chrome Moly Alloy Structural Round Bar

High-strength AISI 4140 chrome moly alloy steel round bar with precise dimensional tolerance, bright surface, excellent hardenability, mechanical properties and anti-fatigue performance. We supply peeled, turned, cold drawn, ground and polished and quenched & tempered bright steel round bar, full MTC test reports available, FOB/FCA/CIF export terms supported.

1. Core Overview

AISI 4140 is medium-carbon chromium-molybdenum alloy steel with outstanding hardenability, high tensile strength and reliable anti-fatigue performance. It features stable mechanical properties, good wear resistance and flexible heat treatment adaptability. Our factory supplies finished AISI 4140 round bar in 3 processing states: hot rolled, cold drawn, peeled ground and polished, quenched & tempered. It is the top choice for global automotive and heavy machinery manufacturing buyers.

2. Chemical Composition

Element	Content
Carbon (C)	0.38–0.43%
Silicon (Si)	0.15–0.35%
Manganese (Mn)	0.75–1.00%
Chromium (Cr)	0.80–1.10%
Molybdenum (Mo)	0.15–0.25%
Phosphorus (P)	≤0.035%
Sulfur (S)	≤0.040%

3. Mechanical Properties（Quenched & Tempered without special requirement）

Item	Typical Value
Tensile Strength	≥1080 MPa
Yield Strength	≥930 MPa
Elongation	≥12%
Feature	High toughness, anti-fatigue, high hardenability

4. Quick Key Data Table

Item	Detailed Specification
Material Grade	AISI 4140 / SAE 4140 Chrome Moly Alloy Steel
Executive Standard	ASTM A29, ASME SA29
Diameter Size Range	6mm–350mm
Cold Drawn Steel Bar Diameter Tolerance	h9/h10/h11
Peeled, Ground & Polished Steel Bar Diameter Tolerance	+0/-0.02mm
Surface Finish	Hot rolled black skin / Cold drawn bright/ Peeled, ground & Polished mirror polished
Heat Treatment Option	Annealed / Quenched & Tempered (adjustable HRC 23–50)
More Processing	Cutting, Chamfering, Drilling, Maching, Shot Blasting etc.
End Processing	Double ends chamfered to remove burrs
Quality Inspection	Rockwell hardness test, Mechanical Properties Testing, Dimension inspection, Surface Roughness Inspection, MPI testing, Eddy Testing UT testing, Grain Size Testing, Non-Mettalic Inclusion Testing, Chemical Composition Testing, SGS certification
Equivalent Grade	42CrMo4, SCM440, EN19, 42CrMo, AS 4140, 42CD

Smooth polished surface detail of AISI 4140 quenched and tempered steel bar

5. Processing Advantages

1) Mirror polished bright surface without oxide scale, defects

2) Double-end chamfer treatment to avoid scratching CNC cutting tools

3) Stable straightness and tight diameter tolerance for high-precision machining

4) Anti-rust waterproof wrapping for long-distance sea export transportation

5) Custom length, hardness and surface treatment as customer drawings

6. Product Features

1) Premium Cr-Mo alloy formula provides excellent heat treatment performance

2) Great strength-toughness balance, resistant to impact and fatigue load

3) Uniform internal structure, low deformation after machining

4) Excellent wear resistance and high-temperature stability

5) Suitable for heavy-load mechanical components

6) Full factory inspection with complete chemical and mechanical test data

AISI 4140 Chrome Moly Steel Round Bar Mechanical Properties and Hardness Testing

7. Application Scope

Our AISI 4140 polished round bar is widely manufactured into automotive crankshaft, transmission shaft, gear, hydraulic spindle, heavy-duty fixture and mechanical spare parts. It performs perfectly under high load, impact and cyclic fatigue working conditions.

1) Automotive parts: crankshaft, connecting rod, axle shaft

2) Mechanical equipment: gears, shafts, spindles, tool holders

3) Petroleum and hydraulic machinery parts

4) Engineering structural components and heavy machinery accessories

5) Mold base and high-load fastener parts

8. Custom Processing Service

We provide one-stop deep processing to reduce buyer’s secondary production cost:

1) Quenched & tempered heat treatment for higher strength and toughness

2) Precision cold drawing for tighter tolerance and smoother surface

3) Shot blasting to remove oxide scale

4) Custom fixed-length cutting and flat head finishing

5) Anti-rust treatment and export customized packaging

Close-up of chamfered ends on AISI 4140 cold drawn polished round bar

9. Packaging & Delivery

1) Export standard packing: steel bundle + anti-rust paper + waterproof cover + steel strip fastening+Wooden Box packing

2) Shipping port: Qingdao Port

3) Delivery time: 15–25 working days after deposit

4) Support FCL full container and LCL bulk shipment

Bulk export packing of AISI 4140 chrome moly alloy steel round bar factory stock

10. FAQ

Q1: What is AISI 4140 steel used for?

A: AISI 4140 is a high-strength Cr-Mo alloy steel mainly used for heavy-load shafts, gears, automotive crankshafts, connecting rods, machinery spindles and petroleum mechanical components.

Q2: What is the equivalent grade of AISI 4140?

A: The equivalent grades are European 42CrMo4, Japanese SCM440 and British EN19.

Q3: Do you provide heat-treated 4140 steel bars?

A: Yes. We supply quenched & tempered AISI 4140 steel round bar with stable mechanical properties for high-load usage scenarios. We also supply annealed steel round bar and normalized steel round bar.

Q4: What is your MOQ and lead time?

A: MOQ is 3 ton. Production lead time is 15–25 working days.

Q5: Can you provide SGS test reports?

A: Yes. We provide official SGS reports covering chemical composition and mechanical properties if you prefer.

Q6: What trade terms do you accept?

A: We support FOB, FCA, CFR and CIF to adapt to different customers’ logistics and customs procedures.

AISI 4140 chromium molybdenum alloy steel bar offers superior hardenability, high strength and excellent fatigue resistance. With stable chemical composition and reliable mechanical performance, it is the preferred material for heavy-duty mechanical and automotive industrial components. Our factory provides standardized production, full quality inspection and one-stop processing & export service for global buyers.

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SHANDONG LE REN SPECIAL STEEL CO., LTD.

 Audited supplier

8 year

Address: Jinan, China

Main Product: Cold Drawn Steel Bar, Bright Steel Bar, Heat Treated Steel Bar and Tube, Threaded Rods , High Strength Steel Tie Rod, High Strength Steel Bolts

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