4140 Alloy Hot Rolled Heat Treated Round Bar
Sizes up to 7 inches meet ASTM-A193-B7, ASME SA193 Grade B7 and/or MIL-S-1222(B7) standards. Sizes over 7 inches to 9 inches meet ASTM A434 Grade BC.
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GNEE 4140 Hot Rolled Heat Treated Round Bar introduce
4140 Alloy Heat Treated Round Bar
4140 Hot Rolled Heat Treated Round Bar
4140 is a widely used medium carbon steel. It is a general purpose alloy with good strength, toughness and hardness. It is called chrome-molybdenum steel because it contains 0.95% chromium and 0.20% molybdenum alloying elements.
4140 heat treatable alloy is a chromium-molybdenum medium carbon alloy steel used in a wide variety of applications requiring high strength and toughness. The chromium element gives it good hardness penetration, while the molybdenum element provides hardness uniformity and strength. In the heat treated or pre-hardened state, it has a Rockwell C hardness between 26-32 and is stress relieved to minimize warping during processing. Local hardness can also be obtained by flame or induction hardening. 4140 is mainly used in bending machine dies and is also an ideal choice for applications that require higher toughness than mild steel. Other typical applications include: bolts, dies, stripper plates, slides, ejector plates, clamps, fixtures, punch plates, drill collars, couplings, axles, valves, machine shafts, reamer bodies, machine blocks.
GNEE 4140 Alloy Hot Rolled Round Bar Specification
AISI 4140 Hot-Rolled Round Bar: Comprehensive Property Table
|
Property Category |
Parameter |
Technical Specifications |
|---|---|---|
|
Basic Dimensions |
Diameter Range (mm) |
20 - 300 |
|
Length Range (m) |
3 - 12 (Cut-to-length tolerance: <sup>+50</sup>⁄<sub>-0</sub> mm) |
|
|
Tolerance Standards |
Diameter Tolerance |
±0.8% (ASTM) / ±0.6% (DIN) / ±1.0% (GB) |
|
Ovality |
≤0.8% of diameter |
|
|
Surface Properties |
Treatment Methods |
Mill scale surface / Turned / Sandblasted |
|
Roughness (Ra) |
12.5 - 25 μm (mill scale) / 3.2 - 6.3 μm (turned) |
|
|
Physical Properties |
Hardness (HB) |
197 - 241 (hot-rolled) / 280 - 350 (Q&T) |
|
Density |
7.85 g/cm³ |
|
|
Material Composition |
Chemical Composition (%) |
C:0.38-0.43, Cr:0.80-1.10, Mo:0.15-0.25, Mn:0.75-1.00, Si:0.15-0.35 |
|
Purity |
Inclusions ≤Grade 2 (ASTM E45), S/P ≤0.035% |
|
|
Core Standards |
International Norms |
ASTM A322 Gr.4140 / EN 10083-1 42CrMo4 / GB/T 3077 42CrMo |
4140 Alloy Hot Rolled Heat Treated Bar Chemical Composition:
| Carbon: | 0.38/0.43 |
| Chromium: | 0.80/1.00 |
| Molybdenum: | 0.15/0.25 |
| Manganese: | 0.75/1.00 |
| Silicon: | 0.15/0.35 |
| Phosphorus: | 0.035 max |
| Sulfur: | 0.040 max |
GNEE 4140 Alloy Hot Rolled Heat Treated Bar Schedule
4140 Alloy Hot Rolled Heat Treated Bar (Inches)
| 1/2 | 1-7/8 | 3-1/2 | 6-1/4 | 9 | 14 |
| 5/8 | 2 | 3-3/4 | 6-1/2 | 9-1/2 | 16 |
| 3/4 | 2-1/8 | 4 | 6-3/4 | 9-3/4 | |
| 7/8 | 2-1/4 | 4-1/4 | 7 | 10 | |
| 1 | 2-3/8 | 4-1/2 | 7-1/4 | 10-1/2 | |
| 1-1/8 | 2-1/2 | 4-3/4 | 7-1/2 | 11 | |
| 1-1/4 | 2-5/8 | 5 | 7-3/4 | 11-1/4 | |
| 1-3/8 | 2-3/4 | 5-1/4 | 8 | 11-1/2 | |
| 1-1/2 | 2-7/8 | 5-1/2 | 8-1/4 | 12 | |
| 1-5/8 | 3 | 5-3/4 | 8-1/2 | 13 | |
| 1-3/4 | 3-1/4 | 6 | 8-3/4 | 13-1/2 |
GNEE Group Factory Environment
GNEE Group 4140 Hot Rolled Heat Treated Bar Factory Environment
GNEE Group 4140 Heat Treated Round Bar Packaging
GNEE Group 4140 Hot Rolled Round Bar Packaging
GNEE Group Testing
GNEE Group 4140 Alloy Hot Rolled HT 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.
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