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20MnCr5 (SAE/ ASTM/ AISI 5120) – 1.7147 / DIN EN 10084 Steel
20MnCr5 steel (DIN EN 10084 – 1.7147 | SAE/AISI 5120) is one of the low-carbon case-hardening steels known for its excellent wear resistance, surface hardenability, and superior ductility. With a wide range of applications from the automotive industry to machinery manufacturing, 20MnCr5 is an ideal choice for gears, shafts, and parts where high surface hardness is required.
On this page, you can find comprehensive information about 20MnCr5 steel equivalents in international standards, its mechanical properties, chemical composition, code meanings, heat treatment details, typical applications, and Hasçelik’s competitive price advantages.
Access all the technical details you need for the right material selection here.
The name 20MnCr5 is a standard steel designation that directly describes its composition and intended use. According to the EN 10084 standard, the code is interpreted as follows:
• “20”: Indicates that the steel contains approximately 0.20% carbon (C). This low carbon content allows easy formability and good ductility. It is also suitable for case hardening processes.
• “Mn”: Refers to manganese (Mn), which increases the steel’s strength and hardenability. Manganese also improves the material’s hot formability.
• “Cr”: Refers to chromium (Cr), which enhances hardenability and wear resistance. It ensures high surface hardness after case hardening.
• “5”: Indicates that the chromium content is around 1.0%. (The “5” corresponds to an approximate range of 0.5–1.0%; some sources describe this as a rounded figure.)
20MnCr5 is a low-carbon, manganese-chromium alloyed case-hardening steel. Its designation clearly reflects both its chemical composition and intended use:
Low carbon + manganese + chromium → ductile core, hard surface
20MnCr5 is commonly accepted as equivalent to the following grades in various countries and international standards:
• AISI / SAE 5120: Its most common equivalent in American standards; frequently listed under this name in automotive industry catalogues.
• DIN 1.7147: The German material number, now covered under the DIN EN 10084 standard.
• AFNOR 20MC5: Its equivalent in French standards (NF A 35-565).
• UNI 20MnCr5: Usually appears under the same name in the Italian standard (UNI 8550).
• JIS SMnC420H: Considered the closest match in the Japanese standard, although carbon and alloy ranges may vary slightly.
Due to its low carbon content, 20MnCr5 provides an excellent combination of high core toughness and good surface hardenability. These features make it an ideal choice for gears, shafts, and other dynamic components.
General mechanical properties vary depending on the condition before and after hot forging or case hardening. Below are the typical mechanical ranges for 20MnCr5:
Basic Mechanical Properties (Annealed Condition)
• Yield strength: approx. ≥ 300 N/mm² (annealed, i.e., softened condition)
• Tensile strength: approx. 550–700 N/mm²
• Elongation at break: approx. 10–15%
• High impact strength: thanks to core ductility, it resists cracking under shock loads.
• Hardness in annealed condition: approx. ~ 180 HB (Brinell Hardness)
Typical Properties After Case Hardening
After carburizing and tempering, the surface achieves high hardness while the core remains ductile:
• Surface hardness: typically desired in the range of 58–62 HRC
• Core hardness: usually remains around 28–45 HRC
• Case depth: generally designed between 0.5–2.5 mm depending on process parameters
• High wear resistance: ensures long service life, especially for gear and cam components
• Surface hardness minimizes surface wear
• Core strength prevents breakage under impact loads
20MnCr5 is a steel specifically developed for case hardening, with low carbon content and carefully controlled manganese-chromium alloying to ensure an optimal balance between surface hardenability and core toughness.
According to DIN EN 10084, the typical chemical composition of 20MnCr5 is as follows:
Main Elements:
• Carbon (C): 0.17–0.22%
Low carbon maintains machinability and impact strength in the core while surface hardness is increased through case hardening.
• Manganese (Mn): 1.10–1.40%
Enhances hardenability, supports ductility, and improves hot forming characteristics.
• Chromium (Cr): 1.00–1.30%
Provides high surface hardness and wear resistance after carburizing.
• Silicon (Si): Max. 0.40%
Increases steel strength and improves resistance to oxidation.
• Phosphorus (P): Max. 0.025%
An undesirable element; kept low as it can increase brittleness.
• Sulfur (S): Max. 0.035%
Controlled at very low levels to support machinability.
20MnCr5’s low carbon structure enables a “hard outside – tough inside” profile through case hardening. This provides both high wear resistance and impact strength. The addition of chromium and manganese ensures deep hardenability and consistent hardness distribution.
As a case-hardening steel that combines surface hardness with a tough inner core, 20MnCr5 is preferred for parts requiring high wear resistance and strength.
This steel is used across a broad range of industries:
• Automotive Industry:
Gears, shafts, axles, crankshafts, and powertrain components that require high strength and wear resistance.
Commonly used in passenger cars, trucks, tractors, and heavy-duty engine parts.
• Machinery Manufacturing:
Gear wheels for gearboxes, camshafts, and bearing housings where high wear and impact resistance are needed.
Industrial equipment parts requiring a hard surface.
• Aerospace:
For critical mechanical components demanding surface hardness and strength.
• Agricultural & Construction Machinery:
Moving parts such as gears, shafts, and camshafts working under heavy conditions.
• Energy Sector:
Components like turbine shafts and gearbox parts that require high strength.
Why Choose 20MnCr5?
• High surface hardness: wear resistance is increased by case hardening.
• Ductile core: reduces the risk of sudden failure under impact loads.
• Good machinability: low carbon content makes it suitable for machining.
• Excellent heat treatment response: desired surface properties can be achieved through carburizing, carbonitriding, and similar processes.
At Hasçelik, we produce 20MnCr5 quality steel with our modern steelmaking infrastructure and process control systems in line with international standards. To maximize metallurgical quality during production:
• Vacuum degassing (VD) is applied to minimize dissolved gas content in the steel’s internal structure, ensuring a more homogeneous and durable product.
• Final finishing stages include crack inspections and thorough checks for surface and internal defects.
This ensures that our Hasçelik 20MnCr5 products deliver high performance and reliability both mechanically and microstructurally.
Factors Affecting Pricing:
Our 20MnCr5 steel prices vary depending on:
• Requested diameter and cross-sectional dimensions
• Product lengths
• Total ordered tonnage
• Special processes and heat treatments applied according to customer specifications
Certification and Documentation:
Hasçelik 20MnCr5 steels are certified in compliance with international standards and delivered with complete quality documentation.
This guarantees a product you can safely use in your industry.
For the Most Accurate Quote:
To receive the most accurate quotation tailored to your needs, simply share your product specifications and requirements with us.
Contact our sales team at info@hascelik.com and get your personalized offer quickly.
Products
20MnCr5 (SAE/ ASTM/ AISI 5120) – 1.7147 / DIN EN 10084 Steel
20MnCr5 steel (DIN EN 10084 – 1.7147 | SAE/AISI 5120) is one of the low-carbon case-hardening steels known for its excellent wear resistance, surface hardenability, and superior ductility. With a wide range of applications from the automotive industry to machinery manufacturing, 20MnCr5 is an ideal choice for gears, shafts, and parts where high surface hardness is required.
On this page, you can find comprehensive information about 20MnCr5 steel equivalents in international standards, its mechanical properties, chemical composition, code meanings, heat treatment details, typical applications, and Hasçelik’s competitive price advantages.
Access all the technical details you need for the right material selection here.
The name 20MnCr5 is a standard steel designation that directly describes its composition and intended use. According to the EN 10084 standard, the code is interpreted as follows:
• “20”: Indicates that the steel contains approximately 0.20% carbon (C). This low carbon content allows easy formability and good ductility. It is also suitable for case hardening processes.
• “Mn”: Refers to manganese (Mn), which increases the steel’s strength and hardenability. Manganese also improves the material’s hot formability.
• “Cr”: Refers to chromium (Cr), which enhances hardenability and wear resistance. It ensures high surface hardness after case hardening.
• “5”: Indicates that the chromium content is around 1.0%. (The “5” corresponds to an approximate range of 0.5–1.0%; some sources describe this as a rounded figure.)
20MnCr5 is a low-carbon, manganese-chromium alloyed case-hardening steel. Its designation clearly reflects both its chemical composition and intended use:
Low carbon + manganese + chromium → ductile core, hard surface
20MnCr5 is commonly accepted as equivalent to the following grades in various countries and international standards:
• AISI / SAE 5120: Its most common equivalent in American standards; frequently listed under this name in automotive industry catalogues.
• DIN 1.7147: The German material number, now covered under the DIN EN 10084 standard.
• AFNOR 20MC5: Its equivalent in French standards (NF A 35-565).
• UNI 20MnCr5: Usually appears under the same name in the Italian standard (UNI 8550).
• JIS SMnC420H: Considered the closest match in the Japanese standard, although carbon and alloy ranges may vary slightly.
Due to its low carbon content, 20MnCr5 provides an excellent combination of high core toughness and good surface hardenability. These features make it an ideal choice for gears, shafts, and other dynamic components.
General mechanical properties vary depending on the condition before and after hot forging or case hardening. Below are the typical mechanical ranges for 20MnCr5:
Basic Mechanical Properties (Annealed Condition)
• Yield strength: approx. ≥ 300 N/mm² (annealed, i.e., softened condition)
• Tensile strength: approx. 550–700 N/mm²
• Elongation at break: approx. 10–15%
• High impact strength: thanks to core ductility, it resists cracking under shock loads.
• Hardness in annealed condition: approx. ~ 180 HB (Brinell Hardness)
Typical Properties After Case Hardening
After carburizing and tempering, the surface achieves high hardness while the core remains ductile:
• Surface hardness: typically desired in the range of 58–62 HRC
• Core hardness: usually remains around 28–45 HRC
• Case depth: generally designed between 0.5–2.5 mm depending on process parameters
• High wear resistance: ensures long service life, especially for gear and cam components
• Surface hardness minimizes surface wear
• Core strength prevents breakage under impact loads
20MnCr5 is a steel specifically developed for case hardening, with low carbon content and carefully controlled manganese-chromium alloying to ensure an optimal balance between surface hardenability and core toughness.
According to DIN EN 10084, the typical chemical composition of 20MnCr5 is as follows:
Main Elements:
• Carbon (C): 0.17–0.22%
Low carbon maintains machinability and impact strength in the core while surface hardness is increased through case hardening.
• Manganese (Mn): 1.10–1.40%
Enhances hardenability, supports ductility, and improves hot forming characteristics.
• Chromium (Cr): 1.00–1.30%
Provides high surface hardness and wear resistance after carburizing.
• Silicon (Si): Max. 0.40%
Increases steel strength and improves resistance to oxidation.
• Phosphorus (P): Max. 0.025%
An undesirable element; kept low as it can increase brittleness.
• Sulfur (S): Max. 0.035%
Controlled at very low levels to support machinability.
20MnCr5’s low carbon structure enables a “hard outside – tough inside” profile through case hardening. This provides both high wear resistance and impact strength. The addition of chromium and manganese ensures deep hardenability and consistent hardness distribution.
As a case-hardening steel that combines surface hardness with a tough inner core, 20MnCr5 is preferred for parts requiring high wear resistance and strength.
This steel is used across a broad range of industries:
• Automotive Industry:
Gears, shafts, axles, crankshafts, and powertrain components that require high strength and wear resistance.
Commonly used in passenger cars, trucks, tractors, and heavy-duty engine parts.
• Machinery Manufacturing:
Gear wheels for gearboxes, camshafts, and bearing housings where high wear and impact resistance are needed.
Industrial equipment parts requiring a hard surface.
• Aerospace:
For critical mechanical components demanding surface hardness and strength.
• Agricultural & Construction Machinery:
Moving parts such as gears, shafts, and camshafts working under heavy conditions.
• Energy Sector:
Components like turbine shafts and gearbox parts that require high strength.
Why Choose 20MnCr5?
• High surface hardness: wear resistance is increased by case hardening.
• Ductile core: reduces the risk of sudden failure under impact loads.
• Good machinability: low carbon content makes it suitable for machining.
• Excellent heat treatment response: desired surface properties can be achieved through carburizing, carbonitriding, and similar processes.
At Hasçelik, we produce 20MnCr5 quality steel with our modern steelmaking infrastructure and process control systems in line with international standards. To maximize metallurgical quality during production:
• Vacuum degassing (VD) is applied to minimize dissolved gas content in the steel’s internal structure, ensuring a more homogeneous and durable product.
• Final finishing stages include crack inspections and thorough checks for surface and internal defects.
This ensures that our Hasçelik 20MnCr5 products deliver high performance and reliability both mechanically and microstructurally.
Factors Affecting Pricing:
Our 20MnCr5 steel prices vary depending on:
• Requested diameter and cross-sectional dimensions
• Product lengths
• Total ordered tonnage
• Special processes and heat treatments applied according to customer specifications
Certification and Documentation:
Hasçelik 20MnCr5 steels are certified in compliance with international standards and delivered with complete quality documentation.
This guarantees a product you can safely use in your industry.
For the Most Accurate Quote:
To receive the most accurate quotation tailored to your needs, simply share your product specifications and requirements with us.
Contact our sales team at info@hascelik.com and get your personalized offer quickly.
