4140 Alloy Steel Round Bar
4140 Round Bar: 8mm – 3000mm Diameter
4140 Plate: 10mm – 1500mm Thickness x 200mm – 3000mm Width
4140 Square Bar: 20mm – 500mm Diameter
Surface Treatment: Blackened, Rough Cut, Turned or as per customer’s requirement.
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
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GNEE 4140 Steel Round Bar introduce
4140 Alloy Round Bar
AISI 4140 Round Bar: The Forging Titan's Backbone
Forged from chromium-molybdenum steel (0.40% C, 0.90% Cr, 0.20% Mo), 4140 round bars deliver unmatched versatility – annealing to a machinable 200 HB hardness (cutting speed 25m/min ), then hardening via oil quenching to 1200 MPa tensile strength (benchmarking strength-to-weight ratios ). Its φ80-100mm critical hardening depth ensures consistent core-to-surface toughness in massive shafts (>30% deeper than carbon steels), while ≥30 J impact toughness withstands crushing forces in mining crusher rotors and forging die holders.
Though raw surfaces surrender to rust in 72 hours, induction-hardened exteriors (55 HRC) or chrome-plated armor extend service life 15x in salt-spray environments. At 1/3 the cost of tool steel H13 , it dominates 70% of gear blanks, hydraulic press columns, and high-stress bolt applications – where its Machinery's Handbook -canonized fatigue strength (450 MPa) outlives lesser alloys by decades.
GNEE 4140 Alloy Steel Bar Specification
4140 Round Bar Specifications
| Dimensions | EN, DIN, JIS, ASTM, BS, ASME, AISI |
|---|---|
| Range | 5mm to 500mm Dia in 100mm to 6000mm Length |
| Diameter | 10 mm To 200 mm |
| Thickenss | 0.5mm to 500mm Diameter |
| Finish | Black, Bright Polished, Rough Turned, NO.4 Finish, Matt Finish, BA Finish supplier |
| Length | 1000 mm Long To 6000 mm Long |
| Form | Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging Etc. |
4140 Round Bar Chemical Composition
| Standard | Grade | C | Mn | P | S | Si | Ni | Cr | Mo |
|---|---|---|---|---|---|---|---|---|---|
| ASTM A29 | 4140 | 0.38-0.43 | 0.75-1.00 | 0.035 | 0.040 | 0.15-0.35 | – | 0.8-1.10 | 0.15-0.25 |
| EN 10250 | 42CrMo4/ 1.7225 |
0.38-0.45 | 0.6-0.9 | 0.035 | 0.035 | 0.4 | – | 0.9-1.2 | 0.15-0.30 |
| JIS G4105 | SCM440 | 0.38-0.43 | 0.60-0.85 | 0.03 | 0.03 | 0.15-0.35 | – | 0.9-1.2 | 0.15-0.30 |
4140 Round Bar Mechanical Properties
| Properties | Metric | Imperial |
|---|---|---|
| Tensile strength | 655 MPa | 95000 psi |
| Yield strength | 415 MPa | 60200 psi |
| Bulk modulus (typical for steel) | 140 GPa | 20300 ksi |
| Shear modulus (typical for steel) | 80 GPa | 11600 ksi |
| Elastic modulus | 190-210 GPa | 27557-30458 ksi |
| Poisson's ratio | 0.27-0.30 | 0.27-0.30 |
| Elongation at break (in 50 mm) | 25.70% | 25.70% |
| Hardness, Brinell | 197 | 197 |
| Hardness, Knoop (converted from Brinell hardness) | 219 | 219 |
| Hardness, Rockwell B (converted from Brinell hardness) | 92 | 92 |
| Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) | 13 | 13 |
| Hardness, Vickers (converted from Brinell hardness) | 207 | 207 |
| Machinability (based on AISI 1212 as 100 machinability) | 65 | 65 |
GNEE 4140 Round Bar Schedule
AVAILABLE SIZES |
||
| Size | Length | Weight (lbs/ft) |
| 3/16" | 144.00" | 0.094 |
| 1/4" | 144.00" | 0.167 |
| 3/8" | 144.00" | 0.376 |
| 1/2" | 144.00" | 0.668 |
| 9/16" | 144.00" | 0.840 |
| 5/8" | 144.00" | 1.043 |
| 3/4" | 144.00" | 1.502 |
| 7/8" | 144.00" | 2.045 |
| 15/16" | 144.00" | 2.347 |
| 1" | 144.00" | 2.670 |
| 1-1/4" | 144.00" | 4.173 |
| 1-1/2" | 144.00" | 6.008 |
| 1-3/4" | 144.00" | 8.178 |
| 2" | 144.00" | 10.680 |
| 3" | 144.00" | 24.030 |
GNEE Group Factory Environment
GNEE Group 4140 Alloy Bar Factory Environment
GNEE Group 4140 Bar Packaging
GNEE Group Aisi 4140 Alloy Steel Round Bar Packaging
GNEE Group Testing
GNEE Group Aisi 4140 Steel Round Bar Testing
FAQ
Is 4140 alloy steel corrosion resistant?
Although 4140 steel contains chromium to improve corrosion resistance, it is not highly resistant to corrosion. Appropriate coatings or protective measures are recommended for use in corrosive environments.
What is the difference between 4140 and 4340 alloy steels?
4140 steel has a lower carbon content than 4340 steel, making it easier to machine. However, 4340 steel has higher strength and toughness, especially in larger sections, and is often used in heavy-duty applications.
Can 4140 alloy steel be welded?
Yes, 4140 steel can be welded using the proper welding techniques and precautions. However, post-weld heat treatment may be required to restore its properties, especially in the heat-affected zone.
What is the maximum hardness that 4140 steel can achieve through heat treatment?
Depending on the specific heat treatment process, 4140 steel can reach a hardness of up to approximately 58-60 HRC.
Is 4140 alloy steel round bar available in a variety of sizes and shapes?
Yes, 4140 Alloy Steel Round Bar is available in a variety of sizes and can also be made into a variety of shapes including square bars and flat bars to suit a variety of applications.
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