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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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42CrMo4 / 1.7225 is the most commonly used alloy steel belongs to European standard EN10083-3 and EN10250-3. It could be used in many different industries, such as petrochemical engineering, machining and manufacturing, aerospace and automobile industry etc, so you could find its equivalent steel from different country standard, such as ASTM 4140 from American standard ASTM A29/A29M, SCM440 from Japanese standard JIS G4105, 42CrMo from Chinese standard GB/T1299, 708M40/EN19 from British standard BS970.
42CrMo4 is Cr-Mo steel series, the carbon content is 0.38-0.45%, after QT, it could acquire very good comprehensive mechanical properties, such as high strength, high tenacity and great abrasive resistance, so it is also known as quenching and tempering steel.
1: Steel equivalent
Country | USA | Europe | China | British | Japan |
Standard | ASTM A29 | EN10083-3 | GB/T3077 | BS970 | JIS G4105 |
Grade | 4140 | 42CrMo4/1.7225 | 42CrMo | 708M40 | SCM440 |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo |
4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | 0.035Max | 0.04Max | 0.8-1.1 | 0.15-0.25 |
42CrMo4/1.7225 | 0.38-0.45 | 0.4Max | 0.6-0.9 | 0.025Max | 0.035Max | 0.9-1.2 | 0.15-0.30 |
42CrMo | 0.38-0.45 | 0.17-0.37 | 0.5-0.8 | 0.035Max | 0.035Max | 0.9-1.2 | 0.15-0.25 |
708M40 | 0.36-0.44 | 0.1-0.4 | 0.7-1.0 | 0.035Max | 0.04Max | 0.9-1.2 | 0.15-0.25 |
SCM440 | 0.38-0.43 | 0.15-0.35 | 0.6-0.85 | 0.035Max | 0.04Max | 0.9-1.2 | 0.15-0.30 |
3: Mechanical properties .
Mechanical properties for 42CrMo4 quenching and tempering alloy steel.
Size range | Tensile strength | Yield strength | Alongation | Area of reduction | Impact value At RT/J |
d≤16 t≤8 | 1100-1300Mpa | 900Mpa Min | 10% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 1100-1200Mpa | 750Mpa Min | 11% Min | 45%Min | 35J Min |
40＜d≤100 20＜t≤60 | 900-1100Mpa | 650Mpa Min | 12% Min | 50%Min | 35J Min |
100＜d≤160 60＜t≤100 | 800-950Mpa | 550Mpa Min | 13% Min | 50%Min | 35J Min |
160＜d≤250 100＜t≤160 | 750-900Mpa | 500Mpa Min | 14% Min | 55%Min | 35J Min |
Sampling and preparation of test pieces for 42CrMo4 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 42CrMo4 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 | 750Mpa Min | 500Mpa Min | 14% Min | 10% Min | 30J Min | 16J Min |
160＜d≤330 | 700Mpa Min | 460Mpa Min | 15% Min | 11% Min | 27J Min | 14J Min |
330＜d≤660 | 600Mpa Min | 390Mpa Min | 16% Min | 12% Min | 22J Min | 12J 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 | 53HRC |
Treated to improve shearability (+S) | HB255Max |
Soft annealed (+A) | HB241Max |
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 | 61 | 61 | 61 | 60 | 60 | 59 | 59 | 58 | 56 | 53 | 51 | 48 | 47 | 46 | 45 |
min | 53 | 53 | 52 | 51 | 49 | 43 | 40 | 37 | 34 | 32 | 31 | 30 | 30 | 29 | 29 | |
Hardness In HRC + HH | max | 61 | 61 | 61 | 60 | 60 | 59 | 59 | 58 | 56 | 53 | 51 | 48 | 47 | 46 | 45 |
min | 56 | 56 | 55 | 54 | 52 | 48 | 46 | 44 | 41 | 39 | 38 | 36 | 36 | 35 | 34 | |
Hardness In HRC + HL | max | 58 | 58 | 58 | 57 | 56 | 54 | 53 | 51 | 49 | 46 | 44 | 42 | 41 | 40 | 40 |
min | 53 | 53 | 52 | 51 | 49 | 43 | 40 | 37 | 34 | 32 | 31 | 30 | 30 | 29 | 29 | |
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
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 | 260 | 270 | 280 | 290 | 300 | 310 |
2) : Stock diameter for hot forged bar
310 | 320 | 330 | 340 | 350 | 360 | 370 | 380 | 390 | 400 |
410 | 420 | 430 | 440 | 450 | 460 | 470 | 480 | 490 | 500 |
510 | 520 | 530 | 540 | 550 |
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
6：Forging processing
Put the 42CrMo4 ingot into the furnace and heat to 1100-1200℃
Forge the ingot, forging temperature should be not less than 800-900℃
Cooling in the air or in the sand after forged
7: Heat treatment
Soft annealed:
Heat 42CrMo4 steel to 680-720℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace
Normalized:
Heat 42CrMo4 steel to 840-870℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
Quenching and tempering:
Heat 42CrMo4 steel to 820-880℃ 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 42CrMo4 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
42CrMo4 steel has poor weldability. For steel material, weldability has strong relationship with carbon element, when the carbon element is more than 0.25%, the weldability will be starting to get worse. The carbon element of 42CrMo4 is around 0.42%, so the weldability is not good.
9：Application
42CrMo4 steel has excellent comprehensive mechanical properties, it is widely used in various fields. Here are some main application.
1): Crankshaft, connecting road and gears in automobile industry
2): Components in aircraft engines and landing gear system
3): Shafts, spindles and other parts in machine tools and industrial machinery
4): Gears, shafts, couplings of crusher, conveyors in mining and metallurgical equipment
5): Turbine shafts and generator rotors in power generation equipment.
42CrMo4 / 1.7225 is the most commonly used alloy steel belongs to European standard EN10083-3 and EN10250-3. It could be used in many different industries, such as petrochemical engineering, machining and manufacturing, aerospace and automobile industry etc, so you could find its equivalent steel from different country standard, such as ASTM 4140 from American standard ASTM A29/A29M, SCM440 from Japanese standard JIS G4105, 42CrMo from Chinese standard GB/T1299, 708M40/EN19 from British standard BS970.
42CrMo4 is Cr-Mo steel series, the carbon content is 0.38-0.45%, after QT, it could acquire very good comprehensive mechanical properties, such as high strength, high tenacity and great abrasive resistance, so it is also known as quenching and tempering steel.
1: Steel equivalent
Country | USA | Europe | China | British | Japan |
Standard | ASTM A29 | EN10083-3 | GB/T3077 | BS970 | JIS G4105 |
Grade | 4140 | 42CrMo4/1.7225 | 42CrMo | 708M40 | SCM440 |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo |
4140 | 0.38-0.43 | 0.15-0.35 | 0.75-1.00 | 0.035Max | 0.04Max | 0.8-1.1 | 0.15-0.25 |
42CrMo4/1.7225 | 0.38-0.45 | 0.4Max | 0.6-0.9 | 0.025Max | 0.035Max | 0.9-1.2 | 0.15-0.30 |
42CrMo | 0.38-0.45 | 0.17-0.37 | 0.5-0.8 | 0.035Max | 0.035Max | 0.9-1.2 | 0.15-0.25 |
708M40 | 0.36-0.44 | 0.1-0.4 | 0.7-1.0 | 0.035Max | 0.04Max | 0.9-1.2 | 0.15-0.25 |
SCM440 | 0.38-0.43 | 0.15-0.35 | 0.6-0.85 | 0.035Max | 0.04Max | 0.9-1.2 | 0.15-0.30 |
3: Mechanical properties .
Mechanical properties for 42CrMo4 quenching and tempering alloy steel.
Size range | Tensile strength | Yield strength | Alongation | Area of reduction | Impact value At RT/J |
d≤16 t≤8 | 1100-1300Mpa | 900Mpa Min | 10% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 1100-1200Mpa | 750Mpa Min | 11% Min | 45%Min | 35J Min |
40＜d≤100 20＜t≤60 | 900-1100Mpa | 650Mpa Min | 12% Min | 50%Min | 35J Min |
100＜d≤160 60＜t≤100 | 800-950Mpa | 550Mpa Min | 13% Min | 50%Min | 35J Min |
160＜d≤250 100＜t≤160 | 750-900Mpa | 500Mpa Min | 14% Min | 55%Min | 35J Min |
Sampling and preparation of test pieces for 42CrMo4 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 42CrMo4 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 | 750Mpa Min | 500Mpa Min | 14% Min | 10% Min | 30J Min | 16J Min |
160＜d≤330 | 700Mpa Min | 460Mpa Min | 15% Min | 11% Min | 27J Min | 14J Min |
330＜d≤660 | 600Mpa Min | 390Mpa Min | 16% Min | 12% Min | 22J Min | 12J 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 | 53HRC |
Treated to improve shearability (+S) | HB255Max |
Soft annealed (+A) | HB241Max |
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 | 61 | 61 | 61 | 60 | 60 | 59 | 59 | 58 | 56 | 53 | 51 | 48 | 47 | 46 | 45 |
min | 53 | 53 | 52 | 51 | 49 | 43 | 40 | 37 | 34 | 32 | 31 | 30 | 30 | 29 | 29 | |
Hardness In HRC + HH | max | 61 | 61 | 61 | 60 | 60 | 59 | 59 | 58 | 56 | 53 | 51 | 48 | 47 | 46 | 45 |
min | 56 | 56 | 55 | 54 | 52 | 48 | 46 | 44 | 41 | 39 | 38 | 36 | 36 | 35 | 34 | |
Hardness In HRC + HL | max | 58 | 58 | 58 | 57 | 56 | 54 | 53 | 51 | 49 | 46 | 44 | 42 | 41 | 40 | 40 |
min | 53 | 53 | 52 | 51 | 49 | 43 | 40 | 37 | 34 | 32 | 31 | 30 | 30 | 29 | 29 | |
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
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 | 260 | 270 | 280 | 290 | 300 | 310 |
2) : Stock diameter for hot forged bar
310 | 320 | 330 | 340 | 350 | 360 | 370 | 380 | 390 | 400 |
410 | 420 | 430 | 440 | 450 | 460 | 470 | 480 | 490 | 500 |
510 | 520 | 530 | 540 | 550 |
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
6：Forging processing
Put the 42CrMo4 ingot into the furnace and heat to 1100-1200℃
Forge the ingot, forging temperature should be not less than 800-900℃
Cooling in the air or in the sand after forged
7: Heat treatment
Soft annealed:
Heat 42CrMo4 steel to 680-720℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace
Normalized:
Heat 42CrMo4 steel to 840-870℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
Quenching and tempering:
Heat 42CrMo4 steel to 820-880℃ 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 42CrMo4 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
42CrMo4 steel has poor weldability. For steel material, weldability has strong relationship with carbon element, when the carbon element is more than 0.25%, the weldability will be starting to get worse. The carbon element of 42CrMo4 is around 0.42%, so the weldability is not good.
9：Application
42CrMo4 steel has excellent comprehensive mechanical properties, it is widely used in various fields. Here are some main application.
1): Crankshaft, connecting road and gears in automobile industry
2): Components in aircraft engines and landing gear system
3): Shafts, spindles and other parts in machine tools and industrial machinery
4): Gears, shafts, couplings of crusher, conveyors in mining and metallurgical equipment
5): Turbine shafts and generator rotors in power generation equipment.
