ThePipingMart Blog Grades 3CR12 Stainless Steel (UNS S40977) – Composition, Properties, and Uses

3CR12 Stainless Steel (UNS S40977) – Composition, Properties, and Uses

3CR12 Stainless Steel

Stainless steel is one of the most commonly used materials globally, with countless applications in different industries, including construction, automotive, and manufacturing. One type of stainless steel has been gaining recognition lately is 3CR12 stainless steel. This material is ferritic stainless steel, often used in aggressive environments that require excellent corrosion resistance. This blog post will dive into 3CR12 stainless steel properties, uses, and more.

3CR12 Stainless Steel Composition

3CR12 stainless steel derives its name from its composition, which includes 12% Chromium. Besides chromium, it comprises nickel and molybdenum, which gives the material robustness and corrosion resistance properties. Compared to other stainless steel grades, 3CR12 stainless steel contains a lower amount of nickel but has a higher amount of chromium, making it more cost-effective.

Grade C Mn Si P S Cr Mo Ni N
3CR12 SS min. 10.50 0.30
S40977 max. 0.030 1.50 1.00 0.040 0.015 12.50 1.00 0.030

3CR12 Stainless Steel Physical Properties

3CR12 Stainless Steel has a density of 7.7 grams per cubic centimetre (g/cc). The high ductility and strength of 3CR12 stainless steel make it perfect for structural and engineering applications.

Grade Density (kg/m3) Elastic Modulus (GPa) Mean Coefficient of Thermal Expansion (µm/m/°C) Thermal Conductivity (W/m.K) Specific Heat
0-100°C (J/kg.K)
Electrical Resistivity (nÙ.m)
0-100°C 0-300°C 0-700°C at 100°C at 500°C
3CR12 7740 200 10.8 11.3 12.5 30.5 31.5 480 570

3CR12 Stainless Steel Mechanical Properties

Grade Tensile Strength (MPa) min Yield Strength 0.2% Proof Stress (MPa) min Elongation (% in 50mm) min Hardness
Rockwell (HR) max Brinell (HB) max
3CR12 SS 450
280 (long.)
320 (trans.)

3CR12 Stainless Steel Uses

Due to its excellent corrosion resistance, superior strength, and cost-effectiveness, 3CR12 stainless steel is a perfect material for various industrial applications. It is commonly used in wastewater applications, mining applications, and construction industries. Additionally, it can be employed in food service applications such as kitchen countertops, sinks, and food preparation areas.

3CR12 Stainless Steel Corrosion Resistance

One of the most exceptional properties of 3CR12 stainless steel is its corrosion resistance. The material can withstand various types of corrosion, including general, pitting, and crevice. It is also resistant to stress corrosion cracking, making it perfect for harsh environments and applications.

3CR12 Stainless Steel Heat Treatment and Machining 

Heat-treating 3CR12 stainless steel improves its mechanical properties, making it harder and increasing its tensile strength. As for machining, it is not an accessible material for conventional cutting tools due to its high strain rate hardening. However, it can be machined relatively easily when softer versions are employed.

3CR12 Stainless Steel Welding

3CR12 stainless steel can be readily welded using various techniques, including gas tungsten arc welding (GTAW) and gas metal arc welding (GMAW). However, it is essential to note that preheating and post-weld heat treatment may be needed, depending on the application and thickness of the material being welded.


In conclusion, 3CR12 stainless steel is an excellent material with several properties, making it useful in various industrial applications. Its excellent corrosion resistance, superior strength, and cost-effectiveness make it ideal for aggressive environments that require robust materials. If you are considering using this material, it is essential to know its composition, mechanical and physical properties. It uses to ensure that it is the perfect material for your application.

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