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E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
No. 18 Xiangfu Middle Road,Yuhua District, Changsha City
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25CrMo4 / 1.7218 is an alloy steel that belongs to the European standards EN 10083-3 and EN 10250-3. It is utilized in various industries, including automotive, machinery manufacturing, oil and gas, and construction, due to its excellent mechanical properties. As a result, you can find its equivalent steel grades in different country standards, such as ASTM 4130 from the American standard ASTM A29/A29M, SCM430 from the Japanese standard JIS G4105, 25CrMo from the Chinese standard GB/T 3077, and 708M25/708A25 from the British standard BS 970.
25CrMo4 is part of the Cr-Mo steel series, with a carbon content of 0.22-0.29%. After undergoing quenching and tempering (QT) heat treatment, it achieves excellent comprehensive mechanical properties, such as high strength, good toughness, and fatigue resistance. This makes it suitable for applications requiring high load-bearing capacity and durability, such as shafts, gears, and structural components. It is also known as a quenching and tempering steel due to its ability to achieve a balanced combination of hardness and toughness through heat treatment.
1: Steel equivalent
Country | USA | Europe | China | British | Japan |
Standard | ASTM A29 | EN10083-3 | GB/T3077 | BS970 | JIS G4105 |
Grade | 4130 | 25CrMo4/1.7218 | 25CrMo | 708M25/708A25 | SCM430 |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo |
4130 | 0.28-0.33 | 0.15-0.35 | 0.40-0.60 | 0.035Max | 0.040Max | 0.8-1.1 | 0.15-0.25 |
25CrMo4/1.7218 | 0.22-0.29 | 0.40Max | 0.60-0.90 | 0.025Max | 0.035Max | 0.9-1.2 | 0.15-0.30 |
25CrMo | 0.22-0.29 | 0.17-0.37 | 0.60-0.90 | 0.030Max | 0.030Max | 0.9-1.2 | 0.15-0.30 |
SCM430 | 0.28-0.33 | 0.15-0.35 | 0.60-0.85 | 0.030Max | 0.030Max | 0.9-1.2 | 0.15-0.30 |
3: Mechanical properties .
Mechanical properties for 25CrMo4 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 | 900-1100Mpa | 700Mpa Min | 12% Min | 50% Min | / |
16＜d≤40 8＜t≤20 | 800-950Mpa | 600Mpa Min | 14% Min | 55%Min | 50J Min |
40＜d≤100 20＜t≤60 | 700-850Mpa | 450Mpa Min | 15% Min | 60%Min | 50J Min |
100＜d≤160 60＜t≤100 | 650-800Mpa | 400Mpa Min | 16% Min | 60%Min | 45J Min |
Sampling and preparation of test pieces for 25CrMo4 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 25CrMo4 open die forgings steel according to EN10250-3
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
≤70d(longitudinal) | 700Mpa Min | 450Mpa Min | 15% Min | 50J Min | ||
70＜d≤160 | 650Mpa Min | 400Mpa Min | 17% Min | 13% Min | 45J Min | 27J Min |
160＜d≤330 | 600Mpa Min | 380Mpa Min | 18% Min | 14% Min | 38J Min | 22J 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 | 54-60HRC |
Treated to improve shearability (+S) | HB255Max |
Soft annealed (+A) | HB212Max |
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 | 52 | 52 | 51 | 50 | 48 | 46 | 43 | 41 | 37 | 35 | 33 | 32 | 31 | 31 | 31 |
min | 44 | 43 | 40 | 37 | 34 | 32 | 29 | 27 | 23 | 21 | 20 | / | / | / | / | |
Hardness In HRC + HH | max | 52 | 52 | 51 | 50 | 48 | 46 | 43 | 41 | 37 | 35 | 33 | 32 | 31 | 31 | 31 |
min | 47 | 46 | 44 | 41 | 39 | 37 | 34 | 32 | 28 | 26 | 24 | 23 | 22 | 22 | 22 | |
Hardness In HRC + HL | max | 49 | 49 | 47 | 46 | 43 | 41 | 38 | 36 | 32 | 30 | 29 | 28 | 27 | 27 | 27 |
min | 44 | 43 | 40 | 37 | 34 | 32 | 29 | 27 | 23 | 21 | 20 | / | / | / | / | |
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.
1): Stock diameter for hot rolled bar
14 | 16 | 18 | 20 | 22 | 25 | 28 | 30 | 32 | 35 | 38 | 40 | 42 | 45 | 50 |
55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 130 |
140 | 150 | 160 | 170 | 180 | 190 | 200 | 210 | 220 | 230 | 240 | 250 | 260 | 270 | 280 |
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
6：Forging processing
Put the 25CrMo4 ingot into the furnace and heat to 1100-850℃
Cooling in the air or in the pit after forged
7: Heat treatment
Soft annealed:
Heat 25CrMo4 steel to 650-700℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace or in the air
Normalized:
Heat 25CrMo4 steel to 860-900℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
Quenching and tempering:
Heat 25CrMo4 steel to 840-900℃ in the furnace
Soak at this temperature in the furnace
Quench in water or oil
Temper steel at 540-680℃ in the furnace
Take out of 25CrMo4 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
The weldability of 25CrMo4 steel is moderately poor. Its weldability is mainly affected by the carbon content and alloying elements. The weldability starts to deteriorate when the carbon content exceeds 0.25%. The carbon content of 25CrMo4 is about 0.22% to 0.29%, so its weldability is moderately poor. In addition, the presence of alloying elements such as chromium and molybdenum increases the risk of cracking and embrittlement in the weld heat affected zone.
9：Application
25CrMo4 has good toughness and wear resistance and is widely used in the following fields.
1): Automobile industry: manufacturing gears, shafts, connecting rods, steering knuckles and other key components.
2): Machinery manufacturing: suitable for the manufacture of high-strength bolts, nuts, pins and other connecting parts, as well as transmission parts of heavy machinery.
3): Oil and gas: for the manufacture of drill pipes, casing and other equipment.
4): Aerospace: for the manufacture of landing gears, engine components, etc.
5): Construction and bridge: for the manufacture of high-strength bolts, pre-stressing steel reinforcement, etc.
6): Tool manufacturing: for the manufacture of high-strength tools, such as wrenches, pliers, etc.
25CrMo4 / 1.7218 is an alloy steel that belongs to the European standards EN 10083-3 and EN 10250-3. It is utilized in various industries, including automotive, machinery manufacturing, oil and gas, and construction, due to its excellent mechanical properties. As a result, you can find its equivalent steel grades in different country standards, such as ASTM 4130 from the American standard ASTM A29/A29M, SCM430 from the Japanese standard JIS G4105, 25CrMo from the Chinese standard GB/T 3077, and 708M25/708A25 from the British standard BS 970.
25CrMo4 is part of the Cr-Mo steel series, with a carbon content of 0.22-0.29%. After undergoing quenching and tempering (QT) heat treatment, it achieves excellent comprehensive mechanical properties, such as high strength, good toughness, and fatigue resistance. This makes it suitable for applications requiring high load-bearing capacity and durability, such as shafts, gears, and structural components. It is also known as a quenching and tempering steel due to its ability to achieve a balanced combination of hardness and toughness through heat treatment.
1: Steel equivalent
Country | USA | Europe | China | British | Japan |
Standard | ASTM A29 | EN10083-3 | GB/T3077 | BS970 | JIS G4105 |
Grade | 4130 | 25CrMo4/1.7218 | 25CrMo | 708M25/708A25 | SCM430 |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo |
4130 | 0.28-0.33 | 0.15-0.35 | 0.40-0.60 | 0.035Max | 0.040Max | 0.8-1.1 | 0.15-0.25 |
25CrMo4/1.7218 | 0.22-0.29 | 0.40Max | 0.60-0.90 | 0.025Max | 0.035Max | 0.9-1.2 | 0.15-0.30 |
25CrMo | 0.22-0.29 | 0.17-0.37 | 0.60-0.90 | 0.030Max | 0.030Max | 0.9-1.2 | 0.15-0.30 |
SCM430 | 0.28-0.33 | 0.15-0.35 | 0.60-0.85 | 0.030Max | 0.030Max | 0.9-1.2 | 0.15-0.30 |
3: Mechanical properties .
Mechanical properties for 25CrMo4 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 | 900-1100Mpa | 700Mpa Min | 12% Min | 50% Min | / |
16＜d≤40 8＜t≤20 | 800-950Mpa | 600Mpa Min | 14% Min | 55%Min | 50J Min |
40＜d≤100 20＜t≤60 | 700-850Mpa | 450Mpa Min | 15% Min | 60%Min | 50J Min |
100＜d≤160 60＜t≤100 | 650-800Mpa | 400Mpa Min | 16% Min | 60%Min | 45J Min |
Sampling and preparation of test pieces for 25CrMo4 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 25CrMo4 open die forgings steel according to EN10250-3
Size range | Tensile strength | Yield strength | Alongation | Impact value at RT/J | ||
L | Tr | L | Tr | |||
≤70d(longitudinal) | 700Mpa Min | 450Mpa Min | 15% Min | 50J Min | ||
70＜d≤160 | 650Mpa Min | 400Mpa Min | 17% Min | 13% Min | 45J Min | 27J Min |
160＜d≤330 | 600Mpa Min | 380Mpa Min | 18% Min | 14% Min | 38J Min | 22J 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 | 54-60HRC |
Treated to improve shearability (+S) | HB255Max |
Soft annealed (+A) | HB212Max |
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 | 52 | 52 | 51 | 50 | 48 | 46 | 43 | 41 | 37 | 35 | 33 | 32 | 31 | 31 | 31 |
min | 44 | 43 | 40 | 37 | 34 | 32 | 29 | 27 | 23 | 21 | 20 | / | / | / | / | |
Hardness In HRC + HH | max | 52 | 52 | 51 | 50 | 48 | 46 | 43 | 41 | 37 | 35 | 33 | 32 | 31 | 31 | 31 |
min | 47 | 46 | 44 | 41 | 39 | 37 | 34 | 32 | 28 | 26 | 24 | 23 | 22 | 22 | 22 | |
Hardness In HRC + HL | max | 49 | 49 | 47 | 46 | 43 | 41 | 38 | 36 | 32 | 30 | 29 | 28 | 27 | 27 | 27 |
min | 44 | 43 | 40 | 37 | 34 | 32 | 29 | 27 | 23 | 21 | 20 | / | / | / | / | |
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.
1): Stock diameter for hot rolled bar
14 | 16 | 18 | 20 | 22 | 25 | 28 | 30 | 32 | 35 | 38 | 40 | 42 | 45 | 50 |
55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 130 |
140 | 150 | 160 | 170 | 180 | 190 | 200 | 210 | 220 | 230 | 240 | 250 | 260 | 270 | 280 |
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
6：Forging processing
Put the 25CrMo4 ingot into the furnace and heat to 1100-850℃
Cooling in the air or in the pit after forged
7: Heat treatment
Soft annealed:
Heat 25CrMo4 steel to 650-700℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace or in the air
Normalized:
Heat 25CrMo4 steel to 860-900℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
Quenching and tempering:
Heat 25CrMo4 steel to 840-900℃ in the furnace
Soak at this temperature in the furnace
Quench in water or oil
Temper steel at 540-680℃ in the furnace
Take out of 25CrMo4 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
The weldability of 25CrMo4 steel is moderately poor. Its weldability is mainly affected by the carbon content and alloying elements. The weldability starts to deteriorate when the carbon content exceeds 0.25%. The carbon content of 25CrMo4 is about 0.22% to 0.29%, so its weldability is moderately poor. In addition, the presence of alloying elements such as chromium and molybdenum increases the risk of cracking and embrittlement in the weld heat affected zone.
9：Application
25CrMo4 has good toughness and wear resistance and is widely used in the following fields.
1): Automobile industry: manufacturing gears, shafts, connecting rods, steering knuckles and other key components.
2): Machinery manufacturing: suitable for the manufacture of high-strength bolts, nuts, pins and other connecting parts, as well as transmission parts of heavy machinery.
3): Oil and gas: for the manufacture of drill pipes, casing and other equipment.
4): Aerospace: for the manufacture of landing gears, engine components, etc.
5): Construction and bridge: for the manufacture of high-strength bolts, pre-stressing steel reinforcement, etc.
6): Tool manufacturing: for the manufacture of high-strength tools, such as wrenches, pliers, etc.
