Are you looking for the best factories in China to source high-quality 4140 alloy steel for your machining needs? If so, you’re in the right place. In this article, we’ll compare the top machining 4140 factories in China, highlighting their strengths, product ranges, and what sets them apart in the industry. Let’s dive in and find the perfect supplier for your projects.
Machining 4140 Steel: From Furnace to Finish
Product Details: 4140 alloy steel is a low-alloy steel containing chromium, molybdenum, manganese, and carbon. It is known for its high tensile strength, superior hardness, and excellent toughness. The chemical composition includes 0.38-0.43% carbon, 0.75-1.00% manganese, 0.15-0.35% silicon, 0.035% maximum phosphorus, 0.040% maximum sulfur, 0.80-1.10% chromium, and 0.15-0.25% molybdenum. It is widely used in automotive, aerospace, oil and gas, mining, and defense industries for high-stress applications such as gears, bolts, and engine components.
Pros:
– High yield strength and density
– Excellent toughness and resistance to wear and tear
– Good fatigue, abrasion, and impact resistance
– Can be heat-treated for increased hardness
– Good machinability, especially in annealed or normalized conditions
– Corrosion-resistant and maintains strength at higher temperatures
– Versatile and used in various high-stress applications
Cons:
– Requires preheating and post-weld heat treatment to prevent cracking during weld…
– Machining requires a balance between hardness and toughness
– May require specific carbide grades and cutting speeds for optimal machining
– Can be more expensive compared to other steel alloys
4140 vs. 8620 Steel: A Selection Guide – China VMT
Product Details: 4140 and 8620 steel are both alloy steels used in various industrial applications. 4140 steel contains 0.38-0.43% carbon, 0.75-1.00% manganese, 0.80-1.10% chromium, and 0.15-0.25% molybdenum. It is known for its high tensile strength and is often used in axles, crankshafts, bolts, and machine parts. 8620 steel contains 0.18-0.23% carbon, 0.70-0.90% manganese, 0.40-0.60% chromium, 0.15-0.25% molybdenum, and 0.40-0.70% nickel. It is valued for its toughness and wear resistance, commonly used in gears, camshafts, and automotive components.
Pros:
– 4140 steel: High tensile strength, excellent toughness, and good machinability….
– 8620 steel: Good weldability, cost-effective, and excellent toughness. Ideal for…
Cons:
– 4140 steel: Higher carbon content makes it challenging to weld, requiring specia…
– 8620 steel: Lower hardness and tensile strength compared to 4140 steel. Not as s…
Blog – No. 1 Stockist of 4140 Alloy Plate in China – Otai …
Machining 4140 Alloy Steel Swiss Parts
Product Details: 4140 alloy steel is a low-alloy steel alloyed with chromium, molybdenum, and manganese. It has a carbon content of 0.38-0.43% and is known for its high fatigue, tensile, and torsional strengths. The steel is wear- and corrosion-resistant and can be easily hardened via heat treatment. It is commonly used in the automotive, aerospace, oil and gas, and manufacturing industries for components like axles, shafts, gears, and bolts. The steel comes in various forms, including bars, plates, and round tubes[1][3][5].
Pros:
– High fatigue, tensile, and torsional strengths
– Wear- and corrosion-resistant due to chromium and molybdenum
– Can be easily hardened via heat treatment
– High ductility when annealed
– Suitable for high-stress and high-temperature applications
Cons:
– Difficult to weld, requiring preheating and post-weld heat treatment
– Inferior weldability characteristics compared to other steels
– Requires slow cooling and heat treatment after welding to maintain mechanical pr…
CNC Medical Parts | Machining 4140 Alloy Steel
Product Details: 4140 alloy steel is a low-alloy steel containing chromium and molybdenum as strengthening agents. It is known for its high tensile strength, toughness, wear resistance, and fatigue strength. This medium-carbon steel is widely used for general-purpose parts requiring high strength and toughness, such as gears, shafts, pins, bolts, and nuts. It can be formed using conventional techniques in the annealed condition and is readily machinable. 4140 alloy steel is available in various forms including bars, sheets, and plates.
Pros:
– High tensile strength and toughness
– Good atmospheric corrosion resistance and wear resistance
– Excellent machinability
– High fatigue and torsional strength
– Can be easily hardened via heat treatment
Cons:
– Difficult to weld, especially without proper thermal treatment
– Requires preheating before welding and slow cooling afterward
– Adding lead (as in 41L40) makes it harder to weld and less pliable at higher tem…
4140 vs. 4130 Steel: A Comprehensive Guide – China VMT
Product Details: 4130 and 4140 steel are both low-alloy steels, primarily composed of carbon, chromium, molybdenum, and manganese. The key difference lies in their carbon content: 4130 steel has a carbon content of 0.28-0.33%, while 4140 steel has a carbon content of 0.38-0.43%. This difference significantly affects their mechanical properties, machinability, and weldability.
Pros:
– 4130 steel offers good balance of strength and toughness, making it suitable for…
– 4130 steel is more machinable due to its lower carbon content, resulting in clea…
– 4130 steel has better weldability with less risk of cracking around the weld zon…
– 4140 steel has higher tensile strength and yield strength, making it suitable fo…
– 4140 steel exhibits high ductility and is easy to draw into wires.
– 4140 steel has better hardenability due to its higher carbon content.
Cons:
– 4140 steel is less machinable compared to 4130 steel due to its higher carbon co…
– 4140 steel requires stricter welding procedures to minimize weld cracking and ma…
– 4140 steel has slightly lower impact resistance compared to 4130 steel due to it…
– Both steels do not have anti-rust properties and require heat treatments for sta…
Tips for Machining 4140 Steel Plate to Optimize its Properties
Product Details: 4140 steel plate is a low-alloy steel containing chromium, molybdenum, and manganese. It is known for its high tensile strength (655-1020 MPa), yield strength (415-655 MPa), and excellent hardness (197-241 Brinell). The steel undergoes heat treatment processes such as quenching and tempering to enhance its mechanical properties. It has good machinability when annealed, but welding requires post-weld treatment. The chemical composition includes 0.38-0.43% carbon, 0.75-1.00% manganese, 0.15-0.35% silicon, 0.035% maximum phosphorus, 0.040% maximum sulfur, 0.80-1.10% chromium, and 0.15-0.25% molybdenum.
Pros:
– High tensile and yield strength, making it suitable for high-stress applications…
– Excellent wear resistance and impact resistance.
– Good machinability when annealed, with a machinability rating of 65-70%.
– High fatigue strength and torsional strength.
– Can be heat-treated to enhance hardness and strength.
– Used in various industries such as automotive, oil and gas, construction, and ma…
Cons:
– Not easily welded; post-weld treatment is necessary.
– Requires proper handling to preserve its properties during machining.
– More pressure is required for forming due to its toughness compared to plain car…
– Heat treatment is necessary to achieve optimal mechanical properties.
4140 h.t. – CNC Machining
Product Details: 4140 alloy steel is a chromium-molybdenum, medium-carbon steel. It is supplied in the annealed or prehardened condition. The prehardened version, designated as 4140 HT, is heat treated to a medium hardness (HRC 28/32). The annealed version is supplied in a soft condition and can be hardened to RC 40. It contains carbon (0.38-0.43%), manganese (0.75-1.00%), chromium (0.80-1.10%), molybdenum (0.15-0.25%), silicon (0.15-0.30%), phosphorus (0.035 max), and sulfur (0.04 max). Typical tensile strength ranges from 89 KSI (hot rolled) to 153 KSI (heat treated and tempered), with corresponding yield strengths[1][4][5].
Pros:
– High fatigue, tensile, and torsional strengths
– Wear- and corrosion-resistant due to chromium and molybdenum content
– Can be easily hardened via heat treatment
– Excellent strength to weight ratio
– Used in high-stress applications such as axles, shafts, gears, and crankshafts
Cons:
– Difficult to weld, requiring preheating and post-weld heat treatment
– Not easily weldable in its hardened state; welding is recommended only on anneal…
– Thermal treatment is necessary to avoid cold cracking during welding
4140 Steel | CNC Mechanical Steel Spare Parts China Factory
CNC Machining Services in china for Alloy Steel 4140
Product Details: AISI/SAE 4140 is a low-alloy steel containing 0.38-0.43% carbon, 0.75-1.00% manganese, 0.80-1.10% chromium, and 0.15-0.25% molybdenum. It is known for its high tensile strength, ranging between 655-740 MPa, and yield strength of approximately 415 MPa. The steel has good atmospheric corrosion resistance, high fatigue strength, and excellent wear and abrasion resistance. It can be heat-treated, normalized, and annealed to enhance its mechanical properties.
Pros:
– High tensile strength and toughness
– Good fatigue, abrasion, and impact resistance
– Excellent machinability, especially in the annealed condition
– Can be heat-treated and surface-hardened for maximum wear resistance
– Versatile applications in automotive, aerospace, oil and gas, and manufacturing…
Cons:
– Not ideal for welding due to its lead content, requiring post-weld heat treatmen…
– Requires more pressure or force for forming due to its toughness
– Higher machining cost factor compared to some other steels, such as 12L14
Comparison Table
| Company | Product Details | Pros | Cons | Website |
|---|---|---|---|---|
| Machining 4140 Steel: From Furnace to Finish | 4140 alloy steel is a low-alloy steel containing chromium, molybdenum, manganese, and carbon. It is known for its high tensile strength, superior hard… | – High yield strength and density – Excellent toughness and resistance to wear and tear – Good fatigue, abrasion, and impact resistance – Can be heat-… | – Requires preheating and post-weld heat treatment to prevent cracking during weld… – Machining requires a balance between hardness and toughness -… | www.otaisteel.com |
| 4140 vs. 8620 Steel: A Selection Guide – China VMT | 4140 and 8620 steel are both alloy steels used in various industrial applications. 4140 steel contains 0.38-0.43% carbon, 0.75-1.00% manganese, 0.80-1… | – 4140 steel: High tensile strength, excellent toughness, and good machinability…. – 8620 steel: Good weldability, cost-effective, and excellent tou… | – 4140 steel: Higher carbon content makes it challenging to weld, requiring specia… – 8620 steel: Lower hardness and tensile strength compared to 41… | www.machining-custom.com |
| Blog – No. 1 Stockist of 4140 Alloy Plate in China – Otai … | www.astmsteel.com | |||
| Machining 4140 Alloy Steel Swiss Parts | 4140 alloy steel is a low-alloy steel alloyed with chromium, molybdenum, and manganese. It has a carbon content of 0.38-0.43% and is known for its hig… | – High fatigue, tensile, and torsional strengths – Wear- and corrosion-resistant due to chromium and molybdenum – Can be easily hardened via heat trea… | – Difficult to weld, requiring preheating and post-weld heat treatment – Inferior weldability characteristics compared to other steels – Requires slow… | www.coxmanufacturing.com |
| CNC Medical Parts | Machining 4140 Alloy Steel | 4140 alloy steel is a low-alloy steel containing chromium and molybdenum as strengthening agents. It is known for its high tensile strength, toughness… | – High tensile strength and toughness – Good atmospheric corrosion resistance and wear resistance – Excellent machinability – High fatigue and torsion… | – Difficult to weld, especially without proper thermal treatment – Requires preheating before welding and slow cooling afterward – Adding lead (as in… |
| 4140 vs. 4130 Steel: A Comprehensive Guide – China VMT | 4130 and 4140 steel are both low-alloy steels, primarily composed of carbon, chromium, molybdenum, and manganese. The key difference lies in their car… | – 4130 steel offers good balance of strength and toughness, making it suitable for… – 4130 steel is more machinable due to its lower carbon content,… | – 4140 steel is less machinable compared to 4130 steel due to its higher carbon co… – 4140 steel requires stricter welding procedures to minimize we… | www.machining-custom.com |
| Tips for Machining 4140 Steel Plate to Optimize its Properties | 4140 steel plate is a low-alloy steel containing chromium, molybdenum, and manganese. It is known for its high tensile strength (655-1020 MPa), yield… | – High tensile and yield strength, making it suitable for high-stress applications… – Excellent wear resistance and impact resistance. – Good machin… | – Not easily welded; post-weld treatment is necessary. – Requires proper handling to preserve its properties during machining. – More pressure is requ… | www.otaisteel.com |
| 4140 h.t. – CNC Machining | 4140 alloy steel is a chromium-molybdenum, medium-carbon steel. It is supplied in the annealed or prehardened condition. The prehardened version, desi… | – High fatigue, tensile, and torsional strengths – Wear- and corrosion-resistant due to chromium and molybdenum content – Can be easily hardened via h… | – Difficult to weld, requiring preheating and post-weld heat treatment – Not easily weldable in its hardened state; welding is recommended only on ann… | www.practicalmachinist.com |
| 4140 Steel | CNC Mechanical Steel Spare Parts China Factory | |||
| CNC Machining Services in china for Alloy Steel 4140 | AISI/SAE 4140 is a low-alloy steel containing 0.38-0.43% carbon, 0.75-1.00% manganese, 0.80-1.10% chromium, and 0.15-0.25% molybdenum. It is known for… | – High tensile strength and toughness – Good fatigue, abrasion, and impact resistance – Excellent machinability, especially in the annealed condition… | – Not ideal for welding due to its lead content, requiring post-weld heat treatmen… – Requires more pressure or force for forming due to its toughne… | ejcnc.com |
Frequently Asked Questions (FAQs)
Frequently Asked Questions About Machining 4140 Steel in China
What are the key properties of 4140 steel that make it suitable for CNC machining?
4140 steel is highly regarded for its excellent mechanical properties, including high tensile strength, fatigue strength, and good toughness. It contains chromium and molybdenum, which enhance its hardness and wear resistance. These properties make it ideal for manufacturing components that need to withstand high stress and complex loads, such as automotive and aerospace parts.
How does the machinability of 4140 steel compare to other steels?
While 4140 steel is considered to have good machinability, it is slightly more challenging to machine compared to some other alloys due to its higher carbon content. However, in its annealed state, 4140 steel is easier to cut, drill, and mill with minimal deformation. Proper tool selection, coolant use, and machining parameters are crucial to optimize its machinability.
What heat treatment processes are necessary for 4140 steel to achieve optimal performance?
Heat treatment is crucial for 4140 steel to enhance its mechanical properties. Processes such as annealing, quenching, and tempering are commonly used. Annealing makes the steel easier to machine and less brittle, while quenching and tempering increase its hardness and toughness. These treatments help the steel achieve the desired properties for high-stress applications.
Can 4140 steel be welded, and what precautions are necessary?
Yes, 4140 steel can be welded, but it requires careful handling due to its higher carbon content. Preheating and post-weld heat treatment are often necessary to prevent cracking and maintain the steel’s mechanical properties. Proper welding techniques, such as gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW), should be used with caution.
What industries commonly use 4140 steel for CNC machining, and why?
4140 steel is widely used in industries such as automotive, aerospace, oil and gas, and heavy-duty machinery manufacturing. Its high strength, toughness, and wear resistance make it ideal for components like crankshafts, gears, shafts, and other high-load-bearing parts. These industries benefit from the steel’s ability to withstand cyclic loading and high-stress conditions.