ThePipingMart Blog Grades Alloy Steel Grade CM 70 – Composition, Properties and Uses

Alloy Steel Grade CM 70 – Composition, Properties and Uses

Alloy Steel Grade CM 70

Alloy Steel Grade CM 70 is a high-performance steel alloy used in the manufacturing industry. It has excellent mechanical and physical properties, making it ideal for use in various applications, from automotive components to industrial machinery. In this blog post, we will explore the composition, chemical properties, mechanical properties, physical properties, corrosion resistance, heat resistance and heat treatment of Alloy Steel Grade CM 70. We will also discuss its machining and welding capabilities.


Alloy CM 70 contains iron as its primary component and molybdenum and nickel as minor components. It also includes other alloying elements such as chromium and manganese. These elements provide strength to the steel alloy while reducing its susceptibility to wear and tear.

Component Elements Properties Metric English Comments
Carbon, C 0.31 % 0.31 % may vary with plate thickness
Iron, Fe 98.315 % 98.315 % as balance
Manganese, Mn 0.85 – 1.2 % 0.85 – 1.2 %
Phosphorus, P 0.035 % 0.035 %
Silicon, Si 0.15 – 0.40 % 0.15 – 0.40 %
Sulfur, S 0.040 % 0.040 %

Chemical Properties

Steel Grade CM 70 has excellent chemical properties that make it resistant to corrosion and oxidation at high temperatures due to its chromium content. Its nickel content helps improve its overall tensile strength as well as its resistance to fatigue cracking in high-pressure environments.

Physical Properties

When it comes to physical properties of Steel CM 70, it has an impressive level of thermal stability which enables it to be used in applications requiring high temperature operations such as in turbines where temperatures can reach up to 1000 degrees Celsius. It also possesses good ductility which allows for easier forming processes during fabrication. Additionally, this steel alloy is highly resistant to wear with an excellent abrasion rate which allows for longer working life with minimal maintenance costs.

Mechanical Properties

Mechanical Properties Metric English Comments
Tensile Strength, Ultimate 485 – 620 MPa 70300 – 89900 psi
Tensile Strength, Yield 260 MPa 37700 psi
Elongation at Break 17 % 17 % in 200mm
21 % 21 % in 50mm
Modulus of Elasticity 200 GPa 29000 ksi Typical Carbon Steel
Bulk Modulus 160 GPa 23200 ksi Typical for Steel
Poissons Ratio 0.29 0.29 Typical Carbon Steel
Shear Modulus 80.0 GPa 11600 ksi Typical for Stee

Thermal Properties

Thermal Properties Metric English Comments
CTE, linear 12.0 µm/m-°C 6.67 µin/in-°F Typical Carbon Steel
Specific Heat Capacity 0.470 J/g-°C 0.112 BTU/lb-°F Typical Carbon Steel
Thermal Conductivity 52.0 W/m-K 361 BTU-in/hr-ft²-°F Typical Carbon Steel


Alloy Steel Grade CM 70 is a very versatile material with numerous uses. Primarily, it has been used in manufacturing railway axles and crankshafts, thanks to its superior strength capabilities and fatigue resistance. It is also used to make a variety of car parts and mechanical components, such as gears and camshafts, due to its good forging and machining qualities. This alloy steel is not limited to just automotive use; it can be found in a range of other industries such as machinery making, petrochemical applications, and defense units. It also makes for an excellent choice for cold forming projects due to its ideal balance between workability, ductility and strength. It’s no wonder Alloy Steel Grade CM 70 is so highly sought after by engineers and manufacturers worldwide!

Corrosion Resistance

Alloy Steel Grade CM 70’s excellent corrosion resistance makes it suitable for application in areas with harsh environmental conditions or exposure to chemicals or corrosive materials such as seawater or oils. This property also makes it a popular choice among manufacturers who are looking for a durable material that won’t corrode easily over time or require frequent repairs or replacements due to damage caused by rust or corrosion over time.

Heat Resistance

The heat resistance of Alloy Steel Grade CM 70 allows for operations at extremely high temperatures without compromising on its integrity or performance levels. Its ability to withstand extreme temperatures also ensures that no scaling takes place during heat treatment processes like hardening and tempering which can be detrimental to the material’s surface quality when not heated correctly.

 Heat Treatment

Heat treatment should always be performed by experienced professionals who understand the intricacies of this process and how different metals respond differently under different temperature ranges depending on their composition and structure type.


Machining of Alloy Steel Grade CM70 is relatively easy compared with other steels due to the presence of nickel and molybdenum which improves cutting performance while reducing tool wear rates significantly making it an ideal choice when producing intricate parts with tight tolerances or complex shapes that require precise control over part dimensions during machining operations.


This steel alloy is also weldable but requires special preparation techniques, such as preheating prior welding for better penetration into the base metal without any warping caused by rapid cooling after welding operations are completed successfully.


Alloy Steel Grade CM70 is a versatile steel alloy offering superior mechanical and physical properties making it ideal for use in various industries from automotive components manufacturing through industrial machinery production all the way up to aerospace engineering applications requiring exceptional levels of durability along with cost-effective solutions where long working life cycles are essential factors contributing towards successful business processes while ensuring customer satisfaction at all times through superior product performance levels regardless of environmental conditions or operational settings. With its wide range of characteristics enabling easy machining yet providing superior heat resistance along with corrosion protection solutions thanks mainly due to its unique chemistry composition this steel alloy proves itself worthy time after time when put under heavy test leading up towards successful results across numerous industries worldwide where reliability coupled with cost effective solutions are essential requirements needed throughout entire production cycles thus proving itself worthy when choosing an ideal material solution regardless if you’re looking for automotive components through industrial machinery parts all the way up towards aerospace engineering solutions focusing on providing best possible outcomes each step along the way. So if you’re looking for reliable yet economical solutions, keep your eyes open on what Alloy Steel Grade CM70 can offer you today!

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