ThePipingMart Blog Grades SAE/AISI 4135 Steel (UNS G41350) – Composition, Properties and Uses

SAE/AISI 4135 Steel (UNS G41350) – Composition, Properties and Uses

SAE / AISI 4135 Steel

If you’re looking for a steel alloy with impressive Strength, Durability, and Corrosion Resistance, look no further than SAE / AISI 4135. This versatile steel is used in a wide variety of applications thanks to its impressive range of characteristics. Let’s take a closer look at why UNS G41350 steel is so popular amongst manufacturers. SAE/AISI 4135 Steel (UNS G41350) is a popular material in the construction and automotive industries due to its versatile properties. This steel alloy is known for its exceptional Strength, Toughness, and Wear Resistance, making it ideal for high-stress applications. SAE 4135 chemical composition includes elements like Chromium, Molybdenum, and Steel, which collectively contribute to its excellent mechanical properties. Due to its superior strength-to-weight ratio, 4135 steel is often used in Heavy-duty Machinery and equipment, as well as in the Aerospace industry. Overall, AISI 4135 is a reliable and durable steel alloy that offers exceptional performance in a wide range of applications.

What Forms of AISI 4135 is Available at Piping Mart?

  • Nut
  • Bar
  • Bolt
  • Pipe
  • Screw
  • Tubing
  • Valves
  • Washers
  • Flanges
  • Fasteners
  • Electrodes
  • Stud Bolts
  • Sheet Plates
  • Pipe Fittings
  • Forged Fitting
  • Instrumentation Fittings

AISI 4135 Composition

AISI 4135 stands as a low-alloy steel, its composition featuring around 0-.330-0.380% carbon, 0.70-0.90% manganese, 0.80-1.10% chromium, and 0.15-0.25% molybdenum, alongside silicon, phosphorus, sulfur, and iron. This blend imparts commendable strength and toughness. The presence of chromium (0.80-1.10%) and molybdenum (0.15-0.25%) augments hardenability and wear resistance, rendering it apt for diverse applications.

Element Content (%)
Iron, Fe 97.33 – 97.87
Chromium, Cr 0.80 – 1.10
Manganese, Mn 0.70 – 0.90
Silicon, Si 0.15 – 0.35
Molybdenum, Mo 0.15 – 0.25
Carbon, C 0.330 – 0.380
Sulfur, S ≤ 0.040
Phosphorous, P ≤ 0.035

AISI 4135 Physical Properties

AISI 4135 exhibits favorable physical properties, characterized by a density of [7.85] g/cm³. With its well-balanced composition, this low-alloy steel delivers commendable strength and toughness. Its physical attributes, including hardness and tensile strength, make it suitable for diverse applications, showcasing versatility and reliability in various industrial contexts.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³

AISI 4135 Mechanical Properties

AISI 4135 exhibits an elastic modulus of [190-210] GPa, a Poisson’s ratio of [0.27-0.30], and varied hardness values: Brinell [187-229], Knoop [230], Rockwell B [94], Rockwell C [15], and Vickers [218]. Its machinability ensures efficient processing. These mechanical properties make AISI 4135 suitable for demanding applications requiring strength and precision.

Properties Metric Imperial
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
Poisson’s ratio 0.27-0.30 0.27-0.30
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 (based AISI 1212 steel, as on 100 machinability) 70 70

AISI 4135 Thermal Properties

AISI 4135 showcases notable thermal properties, specifically focusing on its thermal conductivity of [42.7] W/(m·K). This low-alloy steel’s efficient heat transfer characteristics make it suitable for applications where thermal considerations are vital. AISI 4135 stands as a reliable material with well-balanced thermal attributes.

Properties Metric Imperial
Thermal conductivity 42.7 W/mK 296 BTU in/hr.ft².°F

AISI 4135 Equivalent

AFNOR 35 CD 4 AFNOR 35 CD 4 TS DIN 1.7220 UNI 34 CrMo 4 KB UNI 35 CrMo 4 UNI 35 CrMo 4 F
JIS SCCrM 3 JIS SCM 1 SS 2234 B.S. 708 A 37 AMS 6365C AMS 6365E
AMS 6372C AMS 6372D ASTM A355 ASTM A519 ASTM A711 MIL SPEC MIL-S-16974
MIL SPEC MIL-S-18733 SAE J404 SAE J412 SAE J770 AMS 6352 AMS 6365
AMS 6372 ASTM A29 ASTM A331 ASTM A372 (V-2) ASTM A519 ASTM A829

AISI 4135 Uses

SAE/AISI 4135, a medium carbon chromium alloy steel with high hardenability, finds widespread use in automotive components and applications demanding strength, toughness, and fatigue resistance. It’s also ideal for manufacturing various tools and machine parts like crankshafts, connecting rods, bolts, nuts, and screws. Its robust gearing capability, strength, and wear resistance make it well-suited for power transmission applications, such as handling high torque demands. Whether applied in crafting potent racing engines or producing components for general-use vehicles, SAE/AISI 4135 proves highly versatile and adaptable to a diverse range of applications.

AISI 4135 Uses in Industries

  • Automotive Industry
  • Aerospace Industry
  • Oil and Gas Industry
  • Construction Industry
  • Industrial Machinery

AISI 4135 Corrosion Resistance

SAE/AISI 4135 steel showcases notable corrosion resistance attributed to its composition, including chromium and molybdenum. These elements collaborate to create a protective layer on the material’s surface, shielding it from corrosive agents and environmental factors. This makes it an excellent choice for outdoor applications where rust prevention is crucial.

AISI 4135 Heat Resistance

In addition to its corrosion resistance, this alloy also offers excellent heat resistance properties too. It can easily withstand temperatures up to 600°F (315°C) without suffering any damage or loss in performance. This makes it well-suited for use in high-temperature applications where long-term stability is required.

AISI 4135 Heat Treatment & Machining

SAE/AISI 4135 steel can be easily heat-treated or machined using traditional methods and techniques since it has good mechanical properties such as hardness, ductility, and strength. It can be quenched and tempered to achieve desired levels of strength and toughness for specific applications too. Additionally, welding this alloy is easy since it has good weldability properties as well.


In summary, SAE / AISI 4135 steel offers an exceptional combination of strength, durability, corrosion resistance, and heat resistance that makes it highly suitable for many industrial applications. Its ease of machinability also makes it an ideal choice for manufacturing components that require precision machining or welding processes. Moreover, its good mechanical properties make it relatively easy to work with compared to other steels with similar characteristics. All these advantages make SAE/AISI 4135 steel a go-to option for many industrial purposes requiring durable materials with enhanced protection against corrosion and high temperatures over prolonged periods of time.

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