SAE/AISI 4142 Alloy Steel (UNS G41420)
SAE/AISI 4142 Alloy Steel (UNS G41420)
SAE/AISI 4142 steel is a high-quality alloy steel with good mechanical properties and various uses. UNS G41420 has a low carbon content and is often used in applications requiring higher toughness, strength, and wear resistance. This blog post will discuss the uses, corrosion resistance, heat resistance, heat treatment, machining, and welding of 4142 Alloy Steel.
AISI 4142 Composition
|Iron, Fe||≥ 96.725|
|Sulfur, S||≤ 0.040|
|Phosphorous, P||≤ 0.035|
AISI 4142 Physical Properties
|Density||7.85 g/cm3||0.284 lb/in³|
AISI 4142 Mechanical Properties
|Elastic modulus||190-210 GPa||27557-30458 ksi|
|Bulk modulus (typical for steel)||140 GPa||20300 ksi|
|Shear modulus (typical for steel)||80 GPa||11600 ksi|
|Hardness, Brinell (annealed and cold drawn)||187-229||187-229|
|Hardness, Knoop (converted from Brinell hardness)||230||230|
|Hardness, Rockwell B (converted from Brinell hardness)||94||94|
|Hardness, Rockwell C (converted from Brinell hardness, value below normal HRC range, for comparison purposes only)||15||15|
|Hardness, Vickers (converted from Brinell hardness)||218||218|
|Machinability (annealed and cold drawn, based AISI 1212 steel, as on 100 machinability)||65||65|
AISI 4142 Thermal Properties
|Thermal conductivity||42.6 W/mK||296 BTU in/hr.ft².°F|
AISI 4142 Equivalent
- ASTM A322
- ASTM A331
- ASTM A505
- ASTM A519
- ASTM A547
- SAE J404
- SAE J412
- SAE J770
- ASTM A29
- ASTM A372 (VIII)
- ASTM A711
- ASTM A752
- ASTM A829
- SAE J1397
AISI 4142 Uses
SAE/AISI 4142 steel is commonly used in automotive components such as gearbox housings, shafts, axles, and wheels; it is also used in agricultural equipment parts such as harrows blade holders, cultivator discs, and tines. It can also be used for machine components like camshafts and crankshafts.
SAE/AISI 4142 steel offers great corrosion resistance due to its high chromium content (13-16%). The chromium forms a passive layer on the surface of the material that prevents corrosion from occurring. The addition of molybdenum (0.7-1%) further enhances the corrosion resistance of this alloy.
SAE / AISI 4142 steel is renowned for its outstanding heat resistance, making it an ideal choice for applications that involve high temperatures. Thanks to its chromium and molybdenum content, this type of steel can maintain its strength even with prolonged exposure to temperatures as high as 600ºC. It has excellent tensile properties, too, so you can be sure the parts created using SAE / AISI 4142 won’t fail under pressure. This allows manufacturers in industries such as aerospace and automotive to create incredibly reliable components while reducing long-term costs associated with repairs or replacements.
The machining of SAE / AISI 4142 is a process that requires extreme precision and attention. This hardened steel alloy is commonly used for automotive parts due to its high strength-to-weight ratio, so being able to create complex shapes and features is essential. The machining process consists of operations such as turning, drilling, reaming, broaching, tapping, and threading. Special attention must be given while cutting this alloy in order to achieve desired dimensions without compromising the material’s hardness. Additionally, cooling strategies must be carefully chosen to produce the best results with minimal waste. With the right expertise and equipment, machining SAE/AISI 4142 can be an exact science that yields superior-quality workpieces.
Welding the Alloy AISI / SAE 4142 steel can be tricky, as it is considered low weldability. The alloy contains elements such as chromium and molybdenum, making it challenging to join through welding. Choosing a preheat temperature of 210°C or higher is an important step when welding 4142 steel, as this will reduce its risk of cracking while being formed. With the correct preheat temperature and correct welding techniques, 4142 steel can handle tougher applications because of its high fatigue strength rating. By getting these two steps right, welders can enjoy working with a durable alloy with a good machinability factor.
SAE / AISI 4142 steel is an incredibly versatile metal that can be used for numerous applications thanks to its excellent corrosion & heat resistance properties combined with its ease of machinability & weldability capabilities. While care must be taken when welding & machining this material due to its high carbon content preheating prior to welding & stress relief after welding are essential steps in order to prevent any cracking or distortion during these processes respectively, while filler rods must also carefully selected in order to match closely enough with regards regarding hardness & tensile strength levels with this alloy type.
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