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E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
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28Mn6
28Mn6 / 1.1170 is a widely used quality carbon-manganese steel compliant with the European standards EN 10083-2(Non-alloy steels for quenching and tempering) and EN 10250-2(Open die steel forgings for general engineering purposes). With a carbon content of 0.25–0.32% and approximately 1.30–1.65% manganese, this medium-carbon manganese steel provides excellent strength, toughness, and wear resistance after normalizing or quenching and tempering heat treatment.
GB 30Mn2, JIS SMn433, and ASTM 1330/1527 are all medium-carbon manganese quenched and tempered structural steels, offering excellent comprehensive mechanical properties and good processability. GB 30Mn2 is a grade specified in the Chinese National Standard (GB/T 3077), classified as a high-quality alloy structural steel. With a carbon content of approximately 0.27%-0.34% and a relatively high manganese content (1.40%-1.80%), it exhibits good hardenability, strength, and wear resistance. Typically used after quenching and tempering (high-temperature tempering), it achieves a favorable balance of strength and toughness, making it suitable for manufacturing shafts, connecting rods, bolts, and other mechanical components subjected to high loads.
JIS SMn433 is an alloy structural steel grade under the Japanese Industrial Standard (JIS G4053). Its chemical composition and mechanical properties are highly similar to GB 30Mn2. It also uses manganese as the primary alloying element, designed to achieve high strength and good toughness through quenching and tempering. Within the Japanese industrial system, this steel is commonly used for transmission components in automobiles and general machinery, as well as high-strength fasteners, demonstrating excellent machinability and reliability.
ASTM A1330 (bars) and ASTM A1527 (forgings) are medium-carbon manganese steel grades under the American Society for Testing and Materials standards. Their chemical composition ranges largely correspond to the aforementioned grades, with carbon content approximately 0.22%-0.29% and manganese content 1.20%-1.50%. Through appropriate quenching and tempering, this material achieves high yield strength and tensile strength while maintaining sufficient impact toughness. It is suitable for manufacturing critical load-bearing components such as gears, axles, and crankshafts.
28Mn6 (1.1170) has direct equivalents in major global steel standards, ensuring compatibility with international manufacturing processes. Here’s how it maps to other grades:
Country | China | Japan | Europe | USA |
Standard | GB/T 3077 | JIS G4053 | EN10250-2 | ASTM A29 |
Grade | 30Mn2 | SMn433 | 28Mn6/1.1170 | 1330/1527 |
This cross-standard compatibility makes 28Mn6 a flexible choice for global supply chains and multi-region manufacturing projects.
The balanced chemical makeup of 28Mn6 is what drives its superior performance. Strictly controlled impurities ensure durability and consistency:
Grade | C | Si | Mn | P | S | Cr |
| 30Mn2 | 0.27-0.34 | 0.17-0.37 | 1.40-1.80 | 0.030Max | 0.030Max | / |
| SMn433 | 0.30-0.36 | 0.15-0.35 | 1.20-1.50 | 0.030Max | 0.030Max | 0.35Max |
| 28Mn6/1.1170 | 0.25-0.32 | 0.40Max | 1.30-1.65 | 0.030Max | 0.035Max | 0.40Max |
| 1330/1527 | 0.22-0.29 | 0.40Max | 1.20-1.50 | 0.040Max | 0.050Max | / |
The high manganese content (1.30–1.65%) enhances hardenability and strength, while low phosphorus and sulfur levels minimize brittleness and improve weldability (when proper processes are followed).
Mechanical performance varies by heat treatment and component size. Below are the key properties as per EN 10083-2 and EN 10250-2 standards:
Ideal for high-strength applications, QT-treated 28Mn6 delivers excellent tensile strength and yield strength:
Size range(d/t) | Tensile strength | Yield strength | Alongation | Area of reduction | Impact value At RT/J |
d≤16 t≤8 | 800-950Mpa | 590Mpa Min | 13% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 700-850Mpa | 490Mpa Min | 15% Min | 45% Min | 40J Min |
| 40＜d≤100 20＜t≤60 | 650-800Mpa | 440Mpa Min | 16% Min | 50% Min | 40J Min |
Suitable for general engineering parts, normalized 28Mn6 offers balanced strength and ductility:
Size range(d/t) | Tensile strength | Yield strength | Alongation |
d≤16 t≤16 | 630Mpa | 345Mpa Min | 17% Min |
16＜d≤100 16＜t≤100 | 600Mpa | 310Mpa Min | 18% Min |
100＜d≤250 100＜t≤250 | 590Mpa | 290Mpa Min | 18% Min |
For forged components, properties adhere to EN 10250-2:
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
| d≤100 | 600Mpa Min | 310Mpa Min | 18% Min | / | 35J Min | / |
| 100＜d≤250 | 570Mpa Min | 290Mpa Min | 18% Min | 12% Min | 30J Min | 20J Min |
| 250＜d≤500 | 540Mpa Min | 270Mpa Min | 18% Min | 12% Min | 25J Min | 15J Min |
| 500＜d≤1000 | 540Mpa Min | 260Mpa Min | 17% Min | 11% Min | 20J Min | 15J Min |
Remark: L= Longitudinal Tr = Transverse
28Mn6 hardness is customizable via heat treatment, making it adaptable to diverse applications:
Heat Treatment | Hardness |
Treated to improve shearability (+S) | HB255Max |
Soft annealed (+A) | HB223Max |
Quenched and tempred (+QT) | HRC28-32(Common Range) |
For applications requiring controlled hardening depth, 28Mn6 offers three hardenability grades (+H, +HH, +HL):
Distance in mm from quenched end | |||||||||||||||||
Distance | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 15 | 20 | 25 | 30 | |
Hardness In HRC + H | max | 54 | 53 | 51 | 48 | 44 | 41 | 38 | 35 | 31 | 29 | 27 | 26 | 25 | 25 | 24 | / |
min | 45 | 42 | 37 | 27 | 21 | / | / | / | / | / | / | / | / | / | / | / | |
| Distance in mm from quenched end | ||||||||||||||||
Distance | 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 5 | |
Hardness In HRC + HH | max | 54 | 53 | 51 | 48 | 44 | 41 | 38 | 35 | 31 | 29 | 27 | 26 | 25 | 25 | 24 |
| min | 48 | 46 | 42 | 34 | 30 | 27 | 24 | 21 | / | / | / | / | / | / | / | |
Hardness In HRC + HL | max | 51 | 49 | 46 | 41 | 35 | 32 | 29 | 26 | 22 | 20 | / | / | / | / | / |
| min | 45 | 42 | 37 | 27 | 21 | / | / | / | / | / | / | / | / | / | / | |
Scatter bands for the Rockwell - C hardness in the end quench hardenability test.
We offer 28Mn6 in a wide range of forms to suit your manufacturing needs, with strict quality control for dimensions and surface quality:
Product type | Size range | Length |
Cold drawn bar | Φ3-Φ80mm | 6000-9000mm |
Hot rolled bar | Φ16-Φ310mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:3-200mm; W:1500-2500mm | 2000-5800mm |
Hot Forged block | T: 80-800mm; W: 100-2500mm | 2000-5800mm |
Hot Rolled Bar Stock Diameters: 16, 18, 20, 22, 24, 25, 26, 27, 28, 30, 31, 32, 33, 35, 36, 38, 39, 40, 42, 45, 46, 48, 50, 52, 55, 56, 58, 60, 62, 63, 65, 68, 70, 72, 75, 78, 80, 82, 83, 85, 87, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260mm.
Hot Forged Bar Stock Diameters: 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530mm.
Stock availability changes daily—contact our sales team for real-time inventory updates.
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
Proper processing is critical to unlocking 28Mn6 performance. Here are the recommended procedures:
Heat 28Mn6 ingot to 1150–1200℃
Forge at a minimum temperature of 850℃
Cooling in the air after forged
Soft Annealing: Heat to 820–850℃ → Soak → Furnace cool. Ideal for improving machinability
Normalizing: Heat to 850–880℃ → Soak → Air cool. Enhances strength and ductility for general use
Quenching & Tempering (QT): Heat to 840–880℃ → Soak → Quench in water (lower temp range) or oil (upper temp range) → Temper at 540–680℃ → Air cool. Delivers maximum strength and toughness
Note: Temperatures are guidelines—adjust based on component size and application requirements.
28Mn6 has moderate weldability due to its medium carbon and high manganese content, which increases hardenability. To avoid cold cracking in the heat-affected zone (HAZ), follow these critical steps:
Preheating: Heat the base material to reduce cooling rates (recommended temperature: 150–250℃).
Low-Hydrogen Materials: Use low-hydrogen electrodes or filler metals to minimize hydrogen-induced cracking.
Post-Weld Heat Treatment: Perform stress relief annealing to soften the HAZ and reduce residual stresses.
Improper welding can compromise joint integrity—consult our technical team for custom welding guidelines.
28Mn6 versatile properties make it a staple in multiple industries. Key applications include:
1. Machinery Manufacturing & General Engineering
Shaft components: Drive shafts, spindles, mandrels (for moderate loads and rotational speeds)
Fasteners: High-strength bolts, studs, nuts
Structural parts: Gears, sprockets, connecting rods, worms (require strength and wear resistance)
2. Automotive Industry
Steering knuckles, connecting rods, splined shafts
Transmission gears and secondary shafts (QT-treated to meet strength/durability requirements)
3. Tools & Molds
Fixtures, chucks, mold bases (for applications not subjected to severe impact)
Compliance: Meets EN 10083-2 and EN 10250-2 standards for consistent quality
Versatility: Wide range of supply forms (bars, plates, forgings) and heat treatment options
Reliability: Strict chemical composition control and mechanical testing ensure performance
Global Compatibility: Equivalent grades available for international projects
Expert Support: Our technical team provides customized forging, heat treatment, and welding guidance
Ready to source high-quality 28Mn6 steel for your project? Contact Qilu Steel’s sales team for:
Real-time stock availability
Custom size or heat treatment requests
Competitive pricing and bulk order discounts
Technical data sheets (TDS) and material certificates
Inquire Now to get started—we deliver reliable 28Mn6 steel solutions worldwide.
28Mn6 / 1.1170 is a widely used quality carbon-manganese steel compliant with the European standards EN 10083-2(Non-alloy steels for quenching and tempering) and EN 10250-2(Open die steel forgings for general engineering purposes). With a carbon content of 0.25–0.32% and approximately 1.30–1.65% manganese, this medium-carbon manganese steel provides excellent strength, toughness, and wear resistance after normalizing or quenching and tempering heat treatment.
GB 30Mn2, JIS SMn433, and ASTM 1330/1527 are all medium-carbon manganese quenched and tempered structural steels, offering excellent comprehensive mechanical properties and good processability. GB 30Mn2 is a grade specified in the Chinese National Standard (GB/T 3077), classified as a high-quality alloy structural steel. With a carbon content of approximately 0.27%-0.34% and a relatively high manganese content (1.40%-1.80%), it exhibits good hardenability, strength, and wear resistance. Typically used after quenching and tempering (high-temperature tempering), it achieves a favorable balance of strength and toughness, making it suitable for manufacturing shafts, connecting rods, bolts, and other mechanical components subjected to high loads.
JIS SMn433 is an alloy structural steel grade under the Japanese Industrial Standard (JIS G4053). Its chemical composition and mechanical properties are highly similar to GB 30Mn2. It also uses manganese as the primary alloying element, designed to achieve high strength and good toughness through quenching and tempering. Within the Japanese industrial system, this steel is commonly used for transmission components in automobiles and general machinery, as well as high-strength fasteners, demonstrating excellent machinability and reliability.
ASTM A1330 (bars) and ASTM A1527 (forgings) are medium-carbon manganese steel grades under the American Society for Testing and Materials standards. Their chemical composition ranges largely correspond to the aforementioned grades, with carbon content approximately 0.22%-0.29% and manganese content 1.20%-1.50%. Through appropriate quenching and tempering, this material achieves high yield strength and tensile strength while maintaining sufficient impact toughness. It is suitable for manufacturing critical load-bearing components such as gears, axles, and crankshafts.
28Mn6 (1.1170) has direct equivalents in major global steel standards, ensuring compatibility with international manufacturing processes. Here’s how it maps to other grades:
Country | China | Japan | Europe | USA |
Standard | GB/T 3077 | JIS G4053 | EN10250-2 | ASTM A29 |
Grade | 30Mn2 | SMn433 | 28Mn6/1.1170 | 1330/1527 |
This cross-standard compatibility makes 28Mn6 a flexible choice for global supply chains and multi-region manufacturing projects.
The balanced chemical makeup of 28Mn6 is what drives its superior performance. Strictly controlled impurities ensure durability and consistency:
Grade | C | Si | Mn | P | S | Cr |
| 30Mn2 | 0.27-0.34 | 0.17-0.37 | 1.40-1.80 | 0.030Max | 0.030Max | / |
| SMn433 | 0.30-0.36 | 0.15-0.35 | 1.20-1.50 | 0.030Max | 0.030Max | 0.35Max |
| 28Mn6/1.1170 | 0.25-0.32 | 0.40Max | 1.30-1.65 | 0.030Max | 0.035Max | 0.40Max |
| 1330/1527 | 0.22-0.29 | 0.40Max | 1.20-1.50 | 0.040Max | 0.050Max | / |
The high manganese content (1.30–1.65%) enhances hardenability and strength, while low phosphorus and sulfur levels minimize brittleness and improve weldability (when proper processes are followed).
Mechanical performance varies by heat treatment and component size. Below are the key properties as per EN 10083-2 and EN 10250-2 standards:
Ideal for high-strength applications, QT-treated 28Mn6 delivers excellent tensile strength and yield strength:
Size range(d/t) | Tensile strength | Yield strength | Alongation | Area of reduction | Impact value At RT/J |
d≤16 t≤8 | 800-950Mpa | 590Mpa Min | 13% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 700-850Mpa | 490Mpa Min | 15% Min | 45% Min | 40J Min |
| 40＜d≤100 20＜t≤60 | 650-800Mpa | 440Mpa Min | 16% Min | 50% Min | 40J Min |
Suitable for general engineering parts, normalized 28Mn6 offers balanced strength and ductility:
Size range(d/t) | Tensile strength | Yield strength | Alongation |
d≤16 t≤16 | 630Mpa | 345Mpa Min | 17% Min |
16＜d≤100 16＜t≤100 | 600Mpa | 310Mpa Min | 18% Min |
100＜d≤250 100＜t≤250 | 590Mpa | 290Mpa Min | 18% Min |
For forged components, properties adhere to EN 10250-2:
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
| d≤100 | 600Mpa Min | 310Mpa Min | 18% Min | / | 35J Min | / |
| 100＜d≤250 | 570Mpa Min | 290Mpa Min | 18% Min | 12% Min | 30J Min | 20J Min |
| 250＜d≤500 | 540Mpa Min | 270Mpa Min | 18% Min | 12% Min | 25J Min | 15J Min |
| 500＜d≤1000 | 540Mpa Min | 260Mpa Min | 17% Min | 11% Min | 20J Min | 15J Min |
Remark: L= Longitudinal Tr = Transverse
28Mn6 hardness is customizable via heat treatment, making it adaptable to diverse applications:
Heat Treatment | Hardness |
Treated to improve shearability (+S) | HB255Max |
Soft annealed (+A) | HB223Max |
Quenched and tempred (+QT) | HRC28-32(Common Range) |
For applications requiring controlled hardening depth, 28Mn6 offers three hardenability grades (+H, +HH, +HL):
Distance in mm from quenched end | |||||||||||||||||
Distance | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 15 | 20 | 25 | 30 | |
Hardness In HRC + H | max | 54 | 53 | 51 | 48 | 44 | 41 | 38 | 35 | 31 | 29 | 27 | 26 | 25 | 25 | 24 | / |
min | 45 | 42 | 37 | 27 | 21 | / | / | / | / | / | / | / | / | / | / | / | |
| Distance in mm from quenched end | ||||||||||||||||
Distance | 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 5 | |
Hardness In HRC + HH | max | 54 | 53 | 51 | 48 | 44 | 41 | 38 | 35 | 31 | 29 | 27 | 26 | 25 | 25 | 24 |
| min | 48 | 46 | 42 | 34 | 30 | 27 | 24 | 21 | / | / | / | / | / | / | / | |
Hardness In HRC + HL | max | 51 | 49 | 46 | 41 | 35 | 32 | 29 | 26 | 22 | 20 | / | / | / | / | / |
| min | 45 | 42 | 37 | 27 | 21 | / | / | / | / | / | / | / | / | / | / | |
Scatter bands for the Rockwell - C hardness in the end quench hardenability test.
We offer 28Mn6 in a wide range of forms to suit your manufacturing needs, with strict quality control for dimensions and surface quality:
Product type | Size range | Length |
Cold drawn bar | Φ3-Φ80mm | 6000-9000mm |
Hot rolled bar | Φ16-Φ310mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:3-200mm; W:1500-2500mm | 2000-5800mm |
Hot Forged block | T: 80-800mm; W: 100-2500mm | 2000-5800mm |
Hot Rolled Bar Stock Diameters: 16, 18, 20, 22, 24, 25, 26, 27, 28, 30, 31, 32, 33, 35, 36, 38, 39, 40, 42, 45, 46, 48, 50, 52, 55, 56, 58, 60, 62, 63, 65, 68, 70, 72, 75, 78, 80, 82, 83, 85, 87, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 155, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260mm.
Hot Forged Bar Stock Diameters: 310, 320, 330, 340, 350, 360, 370, 380, 390, 400, 410, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530mm.
Stock availability changes daily—contact our sales team for real-time inventory updates.
Surface Finish | Turned | Milled | Grinding(Best) | Polished(Best) | Peeled(Best) | Black Forged | Black Rolled |
Tolerance | +0/+3mm | +0/+3mm | +0/+0.05mm | +0/+0.05mm | +0/+0.1mm | +0/+5mm | +0/+1mm |
Straighness | 1mm/1000mm max. | 3mm/1000mm max. | |||||
Proper processing is critical to unlocking 28Mn6 performance. Here are the recommended procedures:
Heat 28Mn6 ingot to 1150–1200℃
Forge at a minimum temperature of 850℃
Cooling in the air after forged
Soft Annealing: Heat to 820–850℃ → Soak → Furnace cool. Ideal for improving machinability
Normalizing: Heat to 850–880℃ → Soak → Air cool. Enhances strength and ductility for general use
Quenching & Tempering (QT): Heat to 840–880℃ → Soak → Quench in water (lower temp range) or oil (upper temp range) → Temper at 540–680℃ → Air cool. Delivers maximum strength and toughness
Note: Temperatures are guidelines—adjust based on component size and application requirements.
28Mn6 has moderate weldability due to its medium carbon and high manganese content, which increases hardenability. To avoid cold cracking in the heat-affected zone (HAZ), follow these critical steps:
Preheating: Heat the base material to reduce cooling rates (recommended temperature: 150–250℃).
Low-Hydrogen Materials: Use low-hydrogen electrodes or filler metals to minimize hydrogen-induced cracking.
Post-Weld Heat Treatment: Perform stress relief annealing to soften the HAZ and reduce residual stresses.
Improper welding can compromise joint integrity—consult our technical team for custom welding guidelines.
28Mn6 versatile properties make it a staple in multiple industries. Key applications include:
1. Machinery Manufacturing & General Engineering
Shaft components: Drive shafts, spindles, mandrels (for moderate loads and rotational speeds)
Fasteners: High-strength bolts, studs, nuts
Structural parts: Gears, sprockets, connecting rods, worms (require strength and wear resistance)
2. Automotive Industry
Steering knuckles, connecting rods, splined shafts
Transmission gears and secondary shafts (QT-treated to meet strength/durability requirements)
3. Tools & Molds
Fixtures, chucks, mold bases (for applications not subjected to severe impact)
Compliance: Meets EN 10083-2 and EN 10250-2 standards for consistent quality
Versatility: Wide range of supply forms (bars, plates, forgings) and heat treatment options
Reliability: Strict chemical composition control and mechanical testing ensure performance
Global Compatibility: Equivalent grades available for international projects
Expert Support: Our technical team provides customized forging, heat treatment, and welding guidance
Ready to source high-quality 28Mn6 steel for your project? Contact Qilu Steel’s sales team for:
Real-time stock availability
Custom size or heat treatment requests
Competitive pricing and bulk order discounts
Technical data sheets (TDS) and material certificates
Inquire Now to get started—we deliver reliable 28Mn6 steel solutions worldwide.
