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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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34CrNiMo6 / 1.6582 is an alloy structural steel belonging to the European standards EN 10083-3 and EN 10250-3. It is widely used in a number of industries, such as heavy machine building, energy engineering, aerospace, automotive industry, and the manufacture of highly loaded components. You can find the equivalent steel grades in various national standards, such as the American standard ASTM 4337 (ASTM A29/A29M), the Japanese standard SNCM439/SNCM8 (JIS G4105) and the British standard 817M40 (BS 970).
34CrNiMo6 is a series of chromium-nickel-molybdenum steels with a carbon content of 0.30-0.38%. After quenching treatment (QT), excellent comprehensive mechanical properties can be obtained, such as high strength, high toughness, good fatigue strength and impact resistance. 34CrNiMo6 has excellent hardenability and comprehensive properties and is commonly used in the manufacture of high-load gears, shafts, connecting rods, crankshafts and other critical components requiring high strength and toughness.
1: Steel equivalent
Country | USA | Europe | British | Japan |
Standard | ASTM A29 | EN10083-3 | BS970-3 | JIS G4105 |
Grade | 4337 | 34CrNiMo6/1.6582 | 817M40 | SNCM439 |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
4337 | 0.30-0.40 | 0.20-0.35 | 0.60-0.80 | 0.035Max | 0.040Max | 0.7-0.9 | 0.20-0.30 | 1.65-2.00 |
34CrNiMo6/1.6582 | 0.30-0.38 | 0.4Max | 0.50-0.80 | 0.025Max | 0.035Max | 1.3-1.7 | 0.15-0.30 | 1.30-1.70 |
817M40 | 0.36-0.44 | 0.10-0.40 | 0.45-0.70 | 0.035Max | 0.040Max | 1.0-1.4 | 0.20-0.35 | / |
SNCM439 | 0.36-0.43 | 0.15-0.35 | 0.60-0.90 | 0.030Max | 0.030Max | 0.6-1.0 | 0.15-0.30 | 1.60-2.00 |
3: Mechanical properties .
Mechanical properties for 34CrNiMo6 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 | 1200-1400Mpa | 1000Mpa Min | 9% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 1100-1300Mpa | 900Mpa Min | 10% Min | 45%Min | 45J Min |
40＜d≤100 20＜t≤60 | 1000-1200Mpa | 800Mpa Min | 11% Min | 50%Min | 45J Min |
100＜d≤160 60＜t≤100 | 900-1100Mpa | 700Mpa Min | 12% Min | 55%Min | 45J Min |
160＜d≤250 100＜t≤160 | 800-950Mpa | 600Mpa Min | 13% Min | 55%Min | 45J Min |
Sampling and preparation of test pieces for 34CrNiMo6 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 34CrNiMo6 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 | 600Mpa Min | 13% Min | 9% Min | 45J Min | 22J Min |
160＜d≤330 | 750Mpa Min | 540Mpa Min | 14% Min | 10% Min | 45J Min | 22J Min |
330＜d≤660 | 700Mpa Min | 490Mpa Min | 15% Min | 11% Min | 40J Min | 20J 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 | 55-62HRC |
Treated to improve shearability (+S) | / |
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 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 |
min | 50 | 50 | 50 | 50 | 49 | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 46 | 45 | 44 | |
Hardness In HRC + HH | max | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 |
min | 53 | 53 | 53 | 53 | 52 | 51 | 51 | 51 | 51 | 50 | 50 | 50 | 50 | 49 | 48 | |
Hardness In HRC + HL | max | 55 | 55 | 55 | 55 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 53 | 53 | 53 |
min | 50 | 50 | 50 | 50 | 49 | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 46 | 45 | 44 | |
Scatter bands for the Rockwell - C hardness in the end quench hardenability test.
5: Supply size & Tolerance & Stock size
Product type | Size range | Length |
Hot rolled bar | Φ16-Φ300mm | 6000-9000mm |
Hot forged bar | Φ140-Φ800mm | 3000-5800mm |
Hot rolled plate/sheet | T:12-120mm; 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 | 19 | 20 | 22 | 25 | 28 | 30 | 32 | 35 | 38 | 40 | 42 | 45 | 48 |
50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 |
125 | 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 34CrNiMo6 ingot into the furnace and heat to 900-1100℃
Cooling in the sand after forged
7: Heat treatment
Soft annealed:
Heat 34CrNiMo6 steel to 650-680℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace
Normalized:
Heat 34CrNiMo6 steel to 850-880℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
Quenching and tempering:
Heat 34CrNiMo6 steel to 830-860℃ in the furnace
Soak at this temperature in the furnace
Quench in water or oil
Temper steel at 540-660℃ in the furnace
Take out of 34CrNiMo6 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
34CrNiMo6 steel weldability is relatively poor, mainly because of its high carbon and alloying elements content is high, easy to produce cracks and brittle organization in the welding process. When the carbon element exceeds 0.25%, the weldability begins to deteriorate. 34CrNiMo6 has a carbon content of 0.30% to 0.38%, which contributes to its reduced weldability.
9：Application
34CrNiMo6 steel has excellent mechanical properties and good toughness, widely used in the field of high requirements for strength and fatigue resistance. The following are its main applications.
1）：Heavy machinery: such as gears, shafts, connecting rods, crankshafts and so on.
2）：Aerospace: used in the manufacture of aircraft landing gears, engine components, drive shafts, etc.
3）：Automobile industry: used in the manufacture of transmission shafts, gears, crankshafts and other components of high-performance automobiles.
4）：Energy industry: for the manufacture of main shafts and gearbox components for wind turbines, as well as components for drilling equipment in the oil and gas industry.
5）：Mold Manufacturing: Used to manufacture large molds, die-casting molds, etc.
6）：Shipbuilding industry: used to manufacture propeller shafts, rudder shafts, gears and other key components of ships.
7）：Construction machinery: used to manufacture transmission parts and structural parts of excavators, cranes and other construction machinery.
34CrNiMo6 / 1.6582 is an alloy structural steel belonging to the European standards EN 10083-3 and EN 10250-3. It is widely used in a number of industries, such as heavy machine building, energy engineering, aerospace, automotive industry, and the manufacture of highly loaded components. You can find the equivalent steel grades in various national standards, such as the American standard ASTM 4337 (ASTM A29/A29M), the Japanese standard SNCM439/SNCM8 (JIS G4105) and the British standard 817M40 (BS 970).
34CrNiMo6 is a series of chromium-nickel-molybdenum steels with a carbon content of 0.30-0.38%. After quenching treatment (QT), excellent comprehensive mechanical properties can be obtained, such as high strength, high toughness, good fatigue strength and impact resistance. 34CrNiMo6 has excellent hardenability and comprehensive properties and is commonly used in the manufacture of high-load gears, shafts, connecting rods, crankshafts and other critical components requiring high strength and toughness.
1: Steel equivalent
Country | USA | Europe | British | Japan |
Standard | ASTM A29 | EN10083-3 | BS970-3 | JIS G4105 |
Grade | 4337 | 34CrNiMo6/1.6582 | 817M40 | SNCM439 |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
4337 | 0.30-0.40 | 0.20-0.35 | 0.60-0.80 | 0.035Max | 0.040Max | 0.7-0.9 | 0.20-0.30 | 1.65-2.00 |
34CrNiMo6/1.6582 | 0.30-0.38 | 0.4Max | 0.50-0.80 | 0.025Max | 0.035Max | 1.3-1.7 | 0.15-0.30 | 1.30-1.70 |
817M40 | 0.36-0.44 | 0.10-0.40 | 0.45-0.70 | 0.035Max | 0.040Max | 1.0-1.4 | 0.20-0.35 | / |
SNCM439 | 0.36-0.43 | 0.15-0.35 | 0.60-0.90 | 0.030Max | 0.030Max | 0.6-1.0 | 0.15-0.30 | 1.60-2.00 |
3: Mechanical properties .
Mechanical properties for 34CrNiMo6 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 | 1200-1400Mpa | 1000Mpa Min | 9% Min | 40% Min | / |
16＜d≤40 8＜t≤20 | 1100-1300Mpa | 900Mpa Min | 10% Min | 45%Min | 45J Min |
40＜d≤100 20＜t≤60 | 1000-1200Mpa | 800Mpa Min | 11% Min | 50%Min | 45J Min |
100＜d≤160 60＜t≤100 | 900-1100Mpa | 700Mpa Min | 12% Min | 55%Min | 45J Min |
160＜d≤250 100＜t≤160 | 800-950Mpa | 600Mpa Min | 13% Min | 55%Min | 45J Min |
Sampling and preparation of test pieces for 34CrNiMo6 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 34CrNiMo6 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 | 600Mpa Min | 13% Min | 9% Min | 45J Min | 22J Min |
160＜d≤330 | 750Mpa Min | 540Mpa Min | 14% Min | 10% Min | 45J Min | 22J Min |
330＜d≤660 | 700Mpa Min | 490Mpa Min | 15% Min | 11% Min | 40J Min | 20J 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 | 55-62HRC |
Treated to improve shearability (+S) | / |
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 | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 |
min | 50 | 50 | 50 | 50 | 49 | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 46 | 45 | 44 | |
Hardness In HRC + HH | max | 58 | 58 | 58 | 58 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 | 57 |
min | 53 | 53 | 53 | 53 | 52 | 51 | 51 | 51 | 51 | 50 | 50 | 50 | 50 | 49 | 48 | |
Hardness In HRC + HL | max | 55 | 55 | 55 | 55 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 54 | 53 | 53 | 53 |
min | 50 | 50 | 50 | 50 | 49 | 48 | 48 | 48 | 48 | 47 | 47 | 47 | 46 | 45 | 44 | |
Scatter bands for the Rockwell - C hardness in the end quench hardenability test.
5: Supply size & Tolerance & Stock size
Product type | Size range | Length |
Hot rolled bar | Φ16-Φ300mm | 6000-9000mm |
Hot forged bar | Φ140-Φ800mm | 3000-5800mm |
Hot rolled plate/sheet | T:12-120mm; 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 | 19 | 20 | 22 | 25 | 28 | 30 | 32 | 35 | 38 | 40 | 42 | 45 | 48 |
50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 |
125 | 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 34CrNiMo6 ingot into the furnace and heat to 900-1100℃
Cooling in the sand after forged
7: Heat treatment
Soft annealed:
Heat 34CrNiMo6 steel to 650-680℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace
Normalized:
Heat 34CrNiMo6 steel to 850-880℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
Quenching and tempering:
Heat 34CrNiMo6 steel to 830-860℃ in the furnace
Soak at this temperature in the furnace
Quench in water or oil
Temper steel at 540-660℃ in the furnace
Take out of 34CrNiMo6 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
34CrNiMo6 steel weldability is relatively poor, mainly because of its high carbon and alloying elements content is high, easy to produce cracks and brittle organization in the welding process. When the carbon element exceeds 0.25%, the weldability begins to deteriorate. 34CrNiMo6 has a carbon content of 0.30% to 0.38%, which contributes to its reduced weldability.
9：Application
34CrNiMo6 steel has excellent mechanical properties and good toughness, widely used in the field of high requirements for strength and fatigue resistance. The following are its main applications.
1）：Heavy machinery: such as gears, shafts, connecting rods, crankshafts and so on.
2）：Aerospace: used in the manufacture of aircraft landing gears, engine components, drive shafts, etc.
3）：Automobile industry: used in the manufacture of transmission shafts, gears, crankshafts and other components of high-performance automobiles.
4）：Energy industry: for the manufacture of main shafts and gearbox components for wind turbines, as well as components for drilling equipment in the oil and gas industry.
5）：Mold Manufacturing: Used to manufacture large molds, die-casting molds, etc.
6）：Shipbuilding industry: used to manufacture propeller shafts, rudder shafts, gears and other key components of ships.
7）：Construction machinery: used to manufacture transmission parts and structural parts of excavators, cranes and other construction machinery.
