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E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
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50CrMo4 / 1.7228 is a high-strength alloy steel belonging to the European standards EN 10083-3 and EN 10250-3. It is widely used in industries requiring superior mechanical properties, such as automotive manufacturing, heavy machinery, aerospace, and oil & gas applications. Its equivalents in other standards include ASTM 4150 from American standard ASTM A29/A29M, 50CrMo from Chinese standard GB/T 3077.
50CrMo4 is part of the Cr-Mo steel series, with a carbon content of 0.46-0.54%, providing higher hardness and strength compared to 42CrMo4. After quenching and tempering, it achieves excellent mechanical properties, including high tensile strength, fatigue resistance, and good toughness.
1: Steel equivalent
Country | USA | Europe | China |
Standard | ASTM A29 | EN10083-3 | GB/T3077 |
Grade | 4150 | 50CrMo4/1.7228 | 50CrMo |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo |
4150 | 0.48-0.53 | 0.15-0.35 | 0.75-1.00 | 0.035Max | 0.040Max | 0.8-1.1 | 0.15-0.25 |
50CrMo4/1.7228 | 0.46-0.54 | 0.40Max | 0.50-0.80 | 0.025Max | 0.035Max | 0.9-1.2 | 0.15-0.30 |
50CrMo | 0.46-0.54 | 0.17-0.37 | 0.50-0.80 | 0.030Max | 0.030Max | 0.9-1.2 | 0.15-0.30 |
3: Mechanical properties .
Mechanical properties for 50CrMo4 quenching and tempering alloy steel according to EN10083-3.
Size range | Tensile strength | Yield strength | Alongation | Area of reduction | Impact value At RT/J |
d≤16 t≤8 | 1100-1300Mpa | 900Mpa Min | 9% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 1000-1200Mpa | 780Mpa Min | 10% Min | 45%Min | 30J Min |
40＜d≤100 20＜t≤60 | 900-1100Mpa | 700Mpa Min | 12% Min | 50%Min | 30J Min |
100＜d≤160 60＜t≤100 | 850-1000Mpa | 650Mpa Min | 13% Min | 50%Min | 30J Min |
160＜d≤250 100＜t≤160 | 800-950Mpa | 550Mpa Min | 13% Min | 50%Min | 30J Min |
Sampling and preparation of test pieces for 50CrMo4 quenching and tempering steel.
1): According to EN10083-1, all samples shall be taken at a distance of 12.5mm below the heat treated surface
2): As stipulated in the contract between buyer and seller.
Mechanical properties for 50CrMo4 open die forgings steel according to EN10250-3
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
d≤160 | 800Mpa Min | 550Mpa Min | 13% Min | 9% Min | 25J Min | 14J Min |
160＜d≤330 | 750Mpa Min | 540Mpa Min | 14% Min | 10% Min | 20J Min | 12J Min |
330＜d≤660 | 700Mpa Min | 490Mpa Min | 15% Min | 11% Min | 15J Min | 10J Min |
Remark: L= Longitudinal Tr = Transverse
Sampling and preparation of test pieces for steel forging.
1: According to EN10250-1, all samples shall be taken at a distance of 4/T below the heat treated surface (with a minimum of 20mm and a maximum of 80mm), and t/2 from the end (where t is the equivalent thickness of the thickness of the ruling section of the forging at the time of heat treatment.
2: As stipulated in the contract between buyer and seller.
4: Surface hardness and hardenability.
Heat Treatment | Hardness |
Flame or Induction hardening | 58HRC |
Soft annealed (+A) | HB248Max |
Quenched and tempred (+QT) | HRC28-32(Common Range) |
Where the steel is ordered by using the symbols for normal (+H) or restricted (+HL, +HH) hardenability requirements, the hardenability values should apply below:
Distance in mm from quenched end | ||||||||||||||||
Distance | 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | |
Hardness In HRC + H | max | 65 | 65 | 64 | 64 | 63 | 63 | 63 | 62 | 61 | 60 | 58 | 57 | 55 | 54 | 54 |
min | 58 | 58 | 57 | 55 | 54 | 53 | 51 | 48 | 45 | 41 | 39 | 38 | 37 | 36 | 36 | |
Hardness In HRC + HH | max | 65 | 65 | 64 | 64 | 63 | 63 | 63 | 62 | 61 | 60 | 58 | 57 | 55 | 54 | 54 |
min | 60 | 60 | 59 | 58 | 57 | 56 | 55 | 53 | 50 | 47 | 45 | 44 | 43 | 42 | 42 | |
Hardness In HRC + HL | max | 63 | 63 | 62 | 61 | 60 | 60 | 59 | 57 | 56 | 54 | 52 | 51 | 49 | 48 | 48 |
min | 58 | 58 | 57 | 55 | 54 | 53 | 51 | 48 | 45 | 41 | 39 | 38 | 37 | 36 | 36 | |
Scatter bands for the Rockwell - C hardness in the end quench hardenability test.
5: Supply size & Tolerance & Stock size
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 |
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. | |||||
Qilu steel stock hot rolled bar and forged bars more than ten thousands tons every month, below our our stock size.
In China, most of clients will use 42CrMo4 instead of 50CrMo4, so the stocks for 50CrMo4 is small, below is the stock size for hot rolled bar.
20 | 22 | 25 | 28 | 30 | 32 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 |
80 | 85 | 90 | 95 | 100 | 110 | 120 |
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
6：Forging processing
Put the 50CrMo4 ingot into the furnace and heat to 1150-1200℃
Forge the ingot, forging temperature should be not less than 850℃
Cooling in the air or in the sand after forged
7: Heat treatment
Soft annealed:
Heat 50CrMo4 steel to 820-860℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace
Normalized:
Heat 50CrMo4 steel to 850-900℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
Quenching and tempering:
Heat 50CrMo4 steel to 820-870℃ in the furnace
Soak at this temperature in the furnace
Quench in oil
Temper steel at 540-680℃ in the furnace
Take out of 50CrMo4 steel from furnace and cool in the air.
Remark: The conditions given above are for guidance, at the temperatures at the lower end of the range are generally applicable to hardening in water and those at the upper end for hardening in oil.
8: Weldability
50CrMo4 steel has poor weldability. For steel material, weldability has a strong relationship with the carbon element. When the carbon content exceeds 0.25%, weldability begins to deteriorate. The carbon content of 50CrMo4 is around 0.50%, significantly higher than the threshold, resulting in very poor weldability. Preheating and post-weld heat treatment are typically required to minimize cracking risks.
9：Application
50CrMo4 is a high-strength alloy structural steel with excellent strength, toughness and fatigue properties, which is widely used in high-load, high-stress mechanical components. Its main application areas include:
1): Gears, drive shafts, universal joints, differential parts, high-performance suspension connecting rods, torsion bars, crankshafts, camshafts, and other high-stress parts.
2): High-strength connectors and pins for excavators, cranes and mining machinery, high-pressure cylinders, piston rods, high-load stamping molds and forging molds.
3): Landing gear components, high-strength fasteners, special bolts
4): Drill pipe joints, high-strength bolts, large gears, bearing housings
5): Axles, hubs, high-strength connectors
50CrMo4 / 1.7228 is a high-strength alloy steel belonging to the European standards EN 10083-3 and EN 10250-3. It is widely used in industries requiring superior mechanical properties, such as automotive manufacturing, heavy machinery, aerospace, and oil & gas applications. Its equivalents in other standards include ASTM 4150 from American standard ASTM A29/A29M, 50CrMo from Chinese standard GB/T 3077.
50CrMo4 is part of the Cr-Mo steel series, with a carbon content of 0.46-0.54%, providing higher hardness and strength compared to 42CrMo4. After quenching and tempering, it achieves excellent mechanical properties, including high tensile strength, fatigue resistance, and good toughness.
1: Steel equivalent
Country | USA | Europe | China |
Standard | ASTM A29 | EN10083-3 | GB/T3077 |
Grade | 4150 | 50CrMo4/1.7228 | 50CrMo |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo |
4150 | 0.48-0.53 | 0.15-0.35 | 0.75-1.00 | 0.035Max | 0.040Max | 0.8-1.1 | 0.15-0.25 |
50CrMo4/1.7228 | 0.46-0.54 | 0.40Max | 0.50-0.80 | 0.025Max | 0.035Max | 0.9-1.2 | 0.15-0.30 |
50CrMo | 0.46-0.54 | 0.17-0.37 | 0.50-0.80 | 0.030Max | 0.030Max | 0.9-1.2 | 0.15-0.30 |
3: Mechanical properties .
Mechanical properties for 50CrMo4 quenching and tempering alloy steel according to EN10083-3.
Size range | Tensile strength | Yield strength | Alongation | Area of reduction | Impact value At RT/J |
d≤16 t≤8 | 1100-1300Mpa | 900Mpa Min | 9% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 1000-1200Mpa | 780Mpa Min | 10% Min | 45%Min | 30J Min |
40＜d≤100 20＜t≤60 | 900-1100Mpa | 700Mpa Min | 12% Min | 50%Min | 30J Min |
100＜d≤160 60＜t≤100 | 850-1000Mpa | 650Mpa Min | 13% Min | 50%Min | 30J Min |
160＜d≤250 100＜t≤160 | 800-950Mpa | 550Mpa Min | 13% Min | 50%Min | 30J Min |
Sampling and preparation of test pieces for 50CrMo4 quenching and tempering steel.
1): According to EN10083-1, all samples shall be taken at a distance of 12.5mm below the heat treated surface
2): As stipulated in the contract between buyer and seller.
Mechanical properties for 50CrMo4 open die forgings steel according to EN10250-3
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
d≤160 | 800Mpa Min | 550Mpa Min | 13% Min | 9% Min | 25J Min | 14J Min |
160＜d≤330 | 750Mpa Min | 540Mpa Min | 14% Min | 10% Min | 20J Min | 12J Min |
330＜d≤660 | 700Mpa Min | 490Mpa Min | 15% Min | 11% Min | 15J Min | 10J Min |
Remark: L= Longitudinal Tr = Transverse
Sampling and preparation of test pieces for steel forging.
1: According to EN10250-1, all samples shall be taken at a distance of 4/T below the heat treated surface (with a minimum of 20mm and a maximum of 80mm), and t/2 from the end (where t is the equivalent thickness of the thickness of the ruling section of the forging at the time of heat treatment.
2: As stipulated in the contract between buyer and seller.
4: Surface hardness and hardenability.
Heat Treatment | Hardness |
Flame or Induction hardening | 58HRC |
Soft annealed (+A) | HB248Max |
Quenched and tempred (+QT) | HRC28-32(Common Range) |
Where the steel is ordered by using the symbols for normal (+H) or restricted (+HL, +HH) hardenability requirements, the hardenability values should apply below:
Distance in mm from quenched end | ||||||||||||||||
Distance | 1.5 | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | |
Hardness In HRC + H | max | 65 | 65 | 64 | 64 | 63 | 63 | 63 | 62 | 61 | 60 | 58 | 57 | 55 | 54 | 54 |
min | 58 | 58 | 57 | 55 | 54 | 53 | 51 | 48 | 45 | 41 | 39 | 38 | 37 | 36 | 36 | |
Hardness In HRC + HH | max | 65 | 65 | 64 | 64 | 63 | 63 | 63 | 62 | 61 | 60 | 58 | 57 | 55 | 54 | 54 |
min | 60 | 60 | 59 | 58 | 57 | 56 | 55 | 53 | 50 | 47 | 45 | 44 | 43 | 42 | 42 | |
Hardness In HRC + HL | max | 63 | 63 | 62 | 61 | 60 | 60 | 59 | 57 | 56 | 54 | 52 | 51 | 49 | 48 | 48 |
min | 58 | 58 | 57 | 55 | 54 | 53 | 51 | 48 | 45 | 41 | 39 | 38 | 37 | 36 | 36 | |
Scatter bands for the Rockwell - C hardness in the end quench hardenability test.
5: Supply size & Tolerance & Stock size
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 |
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. | |||||
Qilu steel stock hot rolled bar and forged bars more than ten thousands tons every month, below our our stock size.
In China, most of clients will use 42CrMo4 instead of 50CrMo4, so the stocks for 50CrMo4 is small, below is the stock size for hot rolled bar.
20 | 22 | 25 | 28 | 30 | 32 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 |
80 | 85 | 90 | 95 | 100 | 110 | 120 |
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
6：Forging processing
Put the 50CrMo4 ingot into the furnace and heat to 1150-1200℃
Forge the ingot, forging temperature should be not less than 850℃
Cooling in the air or in the sand after forged
7: Heat treatment
Soft annealed:
Heat 50CrMo4 steel to 820-860℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace
Normalized:
Heat 50CrMo4 steel to 850-900℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
Quenching and tempering:
Heat 50CrMo4 steel to 820-870℃ in the furnace
Soak at this temperature in the furnace
Quench in oil
Temper steel at 540-680℃ in the furnace
Take out of 50CrMo4 steel from furnace and cool in the air.
Remark: The conditions given above are for guidance, at the temperatures at the lower end of the range are generally applicable to hardening in water and those at the upper end for hardening in oil.
8: Weldability
50CrMo4 steel has poor weldability. For steel material, weldability has a strong relationship with the carbon element. When the carbon content exceeds 0.25%, weldability begins to deteriorate. The carbon content of 50CrMo4 is around 0.50%, significantly higher than the threshold, resulting in very poor weldability. Preheating and post-weld heat treatment are typically required to minimize cracking risks.
9：Application
50CrMo4 is a high-strength alloy structural steel with excellent strength, toughness and fatigue properties, which is widely used in high-load, high-stress mechanical components. Its main application areas include:
1): Gears, drive shafts, universal joints, differential parts, high-performance suspension connecting rods, torsion bars, crankshafts, camshafts, and other high-stress parts.
2): High-strength connectors and pins for excavators, cranes and mining machinery, high-pressure cylinders, piston rods, high-load stamping molds and forging molds.
3): Landing gear components, high-strength fasteners, special bolts
4): Drill pipe joints, high-strength bolts, large gears, bearing housings
5): Axles, hubs, high-strength connectors
