English 
T: +86-0731-85185770
E: enquiry@qilumetal.com
E: enquiry@qilumetal.com
No. 18 Xiangfu Middle Road,Yuhua District, Changsha City
 |
| Quantity: | |
|---|---|
20NiCrMo2-2 / 1.6523 is an alloyed carburizing steel, which belongs to the European standards EN 10084 and ISO683-11. It is widely used in several industries, such as automotive manufacturing, gear manufacturing, heavy machinery, and highly loaded transmission components. So you can find its equivalent in different national standards, such as ASTM 8620 from American standard ASTM A29/A29M, SNCM220 from Japanese standard JIS G4105, 20CrNiMo from Chinese standard GB/T3077, 805M20 from British standard BS970.
20NiCrMo2-2 is a Ni-Cr-Mo steel series with a carbon content of 0.17-0.23%. After carburizing and quenching and tempering treatment, it can obtain excellent surface hardness and core toughness, as well as good fatigue resistance and wear resistance. Because of its excellent carburizing properties and comprehensive mechanical properties, 20NiCrMo2-2 is commonly used in the manufacture of gears, shafts, clutch parts, and other components requiring high surface hardness and high core toughness. It is also known as a carburized steel and is suitable for applications requiring very high surface hardness and wear resistance.
1: Steel equivalent
Country | USA | Europe | China | British | Japan |
Standard | ASTM A29 | EN10084 | GB/T3077 | BS970 | JIS G4105 |
Grade | 8620 | 20NiCrMo2-2/1.6523 | 20CrNiMo | 805M20 | SNCM220 |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
8620 | 0.18-0.23 | 0.15-0.35 | 0.70-0.90 | 0.035Max | 0.040Max | 0.4-0.6 | 0.15-0.25 | 0.40-0.70 |
20NiCrMo2-2/1.6523 | 0.17-0.23 | 0.40Max | 0.65-0.95 | 0.025Max | 0.035Max | 0.35-0.7 | 0.15-0.25 | 0.40-0.70 |
20CrNiMo | 0.17-0.23 | 0.17-0.37 | 0.60-0.95 | 0.030Max | 0.030Max | 0.4-0.7 | 0.20-0.30 | 0.35-0.75 |
805M20 | 0.17-0.23 | / | 0.60-0.95 | 0.035Max | 0.035Max | 0.35-0.65 | 0.15-0.25 | 0.35-0.75 |
SNCM220 | 0.17-0.23 | 0.15-0.35 | 0.60-0.90 | 0.030Max | 0.030Max | 0.40-0.65 | 0.15-0.30 | 0.40-0.70 |
3: Mechanical properties .
Steel grades 20NiCrMo2-2 according to minimum tensile strength as a function of diameter after hardening and tempering at 200℃ according to EN10084.
Size range | Tensile strength |
d≤16 | 1100Mpa Min |
16＜d≤40 | 700Mpa Min |
40＜d≤100 | 500Mpa Min |
Mechanical properties for reference test bar in the simulated case-hardening condition according to ISO 683-11-1987.
Size range | Tensile strength | Yield strength | Alongation | Impact value At RT/J |
d=16 | 810-1160Mpa | 560Mpa Min | 9% Min | 25J Min |
d=30 | 730-1080Mpa | 510Mpa Min | 10% Min | 30J Min |
d=63 | 660-1010Mpa | 470Mpa Min | 11% Min | 30J Min |
Sampling and preparation of test pieces for 20NiCrMo2-2 case-hardening steel.
1): According to EN10084, all samples shall be taken at a distance of 1/4 of the diameter or thickness below the heat-treated surface.
2): As stipulated in the contract between buyer and seller.
4: Surface hardness and hardenability.
Heat Treatment | Hardness |
Treated to improve shearability (+S) | HB255Max |
Soft annealed (+A) | HB212Max |
Treated to hardness range(+TH) | 161-212HBW |
Treated to ferrite-pearlite structure and hardness range(+FP) | 149-194HBW |
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 | |
Hardness In HRC + H | max | 49 | 48 | 45 | 42 | 36 | 33 | 31 | 30 | 27 | 25 | 24 | 24 | 23 |
min | 41 | 37 | 31 | 25 | 22 | 20 | / | / | / | / | / | / | / | |
Hardness In HRC + HH | max | 49 | 48 | 45 | 42 | 36 | 33 | 31 | 30 | 27 | 25 | 24 | 24 | 23 |
min | 44 | 41 | 36 | 31 | 27 | 24 | 22 | 21 | / | / | / | / | / | |
Hardness In HRC + HL | max | 46 | 44 | 40 | 36 | 31 | 29 | 27 | 26 | 23 | 21 | 20 | 20 | / |
min | 41 | 37 | 31 | 25 | 22 | 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 |
Hot rolled bar | Φ8-Φ270mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:20-120mm; 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
8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 25 | 26 | 28 | 30 | 32 | 35 | 36 |
38 | 40 | 42 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 |
105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 160 | 170 | 180 | 185 | 190 |
200 | 210 | 220 | 230 | 240 | 250 | 260 | 270 |
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
6：Forging processing
Put the 20NiCrMo2-2 ingot into the furnace and heat to 1150-1200℃
Forge the ingot, forging temperature should be not less than 850℃
Cooling in the air after forged
7: Heat treatment
Soft annealed:
Heat 20NiCrMo2-2 steel to 820-850℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace or in the air
Normalized:
Heat 20NiCrMo2-2 steel to 880-920℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
End quench test Austenitizing temperature: 920℃
Carburizing temperature: 880-980℃
Core-hardening temperature: 860-900℃
Case-hardening temperature: 780-820℃
Quenching and tempering:
Heat 20NiCrMo2-2 steel to 850-880℃ in the furnace
Soak at this temperature in the furnace
Quench in water or oil
Temper steel at 150-200℃ in the furnace
Take out of 20NiCrMo2-2 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
20NiCrMo2-2 steel has good weldability. For steel materials, weldability is strongly influenced by the carbon content. When the carbon content exceeds 0.25%, the weldability decreases. The carbon content of 20NiCrMo2-2 is usually in the range of 0.17% - 0.23%, which is relatively moderate.
9：Application
20NiCrMo2-2 steel has excellent hardenability, strength, toughness and fatigue strength. The following are its main application uses.
1）：Gear manufacturing: Gears for automobiles, industrial machinery, wind power equipment.
Shaft parts: transmission shafts and crankshafts for automobiles and heavy machinery.
2）：Fasteners: high-strength bolts, nuts, etc.
3）：Tools and molds: cold work molds, stamping tools, etc.
4）：Other mechanical parts: connecting rods, pins, etc.
20NiCrMo2-2 / 1.6523 is an alloyed carburizing steel, which belongs to the European standards EN 10084 and ISO683-11. It is widely used in several industries, such as automotive manufacturing, gear manufacturing, heavy machinery, and highly loaded transmission components. So you can find its equivalent in different national standards, such as ASTM 8620 from American standard ASTM A29/A29M, SNCM220 from Japanese standard JIS G4105, 20CrNiMo from Chinese standard GB/T3077, 805M20 from British standard BS970.
20NiCrMo2-2 is a Ni-Cr-Mo steel series with a carbon content of 0.17-0.23%. After carburizing and quenching and tempering treatment, it can obtain excellent surface hardness and core toughness, as well as good fatigue resistance and wear resistance. Because of its excellent carburizing properties and comprehensive mechanical properties, 20NiCrMo2-2 is commonly used in the manufacture of gears, shafts, clutch parts, and other components requiring high surface hardness and high core toughness. It is also known as a carburized steel and is suitable for applications requiring very high surface hardness and wear resistance.
1: Steel equivalent
Country | USA | Europe | China | British | Japan |
Standard | ASTM A29 | EN10084 | GB/T3077 | BS970 | JIS G4105 |
Grade | 8620 | 20NiCrMo2-2/1.6523 | 20CrNiMo | 805M20 | SNCM220 |
2: Chemical composition
Grade | C | Si | Mn | P | S | Cr | Mo | Ni |
8620 | 0.18-0.23 | 0.15-0.35 | 0.70-0.90 | 0.035Max | 0.040Max | 0.4-0.6 | 0.15-0.25 | 0.40-0.70 |
20NiCrMo2-2/1.6523 | 0.17-0.23 | 0.40Max | 0.65-0.95 | 0.025Max | 0.035Max | 0.35-0.7 | 0.15-0.25 | 0.40-0.70 |
20CrNiMo | 0.17-0.23 | 0.17-0.37 | 0.60-0.95 | 0.030Max | 0.030Max | 0.4-0.7 | 0.20-0.30 | 0.35-0.75 |
805M20 | 0.17-0.23 | / | 0.60-0.95 | 0.035Max | 0.035Max | 0.35-0.65 | 0.15-0.25 | 0.35-0.75 |
SNCM220 | 0.17-0.23 | 0.15-0.35 | 0.60-0.90 | 0.030Max | 0.030Max | 0.40-0.65 | 0.15-0.30 | 0.40-0.70 |
3: Mechanical properties .
Steel grades 20NiCrMo2-2 according to minimum tensile strength as a function of diameter after hardening and tempering at 200℃ according to EN10084.
Size range | Tensile strength |
d≤16 | 1100Mpa Min |
16＜d≤40 | 700Mpa Min |
40＜d≤100 | 500Mpa Min |
Mechanical properties for reference test bar in the simulated case-hardening condition according to ISO 683-11-1987.
Size range | Tensile strength | Yield strength | Alongation | Impact value At RT/J |
d=16 | 810-1160Mpa | 560Mpa Min | 9% Min | 25J Min |
d=30 | 730-1080Mpa | 510Mpa Min | 10% Min | 30J Min |
d=63 | 660-1010Mpa | 470Mpa Min | 11% Min | 30J Min |
Sampling and preparation of test pieces for 20NiCrMo2-2 case-hardening steel.
1): According to EN10084, all samples shall be taken at a distance of 1/4 of the diameter or thickness below the heat-treated surface.
2): As stipulated in the contract between buyer and seller.
4: Surface hardness and hardenability.
Heat Treatment | Hardness |
Treated to improve shearability (+S) | HB255Max |
Soft annealed (+A) | HB212Max |
Treated to hardness range(+TH) | 161-212HBW |
Treated to ferrite-pearlite structure and hardness range(+FP) | 149-194HBW |
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 | |
Hardness In HRC + H | max | 49 | 48 | 45 | 42 | 36 | 33 | 31 | 30 | 27 | 25 | 24 | 24 | 23 |
min | 41 | 37 | 31 | 25 | 22 | 20 | / | / | / | / | / | / | / | |
Hardness In HRC + HH | max | 49 | 48 | 45 | 42 | 36 | 33 | 31 | 30 | 27 | 25 | 24 | 24 | 23 |
min | 44 | 41 | 36 | 31 | 27 | 24 | 22 | 21 | / | / | / | / | / | |
Hardness In HRC + HL | max | 46 | 44 | 40 | 36 | 31 | 29 | 27 | 26 | 23 | 21 | 20 | 20 | / |
min | 41 | 37 | 31 | 25 | 22 | 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 |
Hot rolled bar | Φ8-Φ270mm | 6000-9000mm |
Hot forged bar | Φ100-Φ1200mm | 3000-5800mm |
Hot rolled plate/sheet | T:20-120mm; 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
8 | 10 | 12 | 14 | 16 | 18 | 20 | 22 | 25 | 26 | 28 | 30 | 32 | 35 | 36 |
38 | 40 | 42 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 |
105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 160 | 170 | 180 | 185 | 190 |
200 | 210 | 220 | 230 | 240 | 250 | 260 | 270 |
Since the stocks change everyday, if you want to know our stock available information, please contact our salesman.
6：Forging processing
Put the 20NiCrMo2-2 ingot into the furnace and heat to 1150-1200℃
Forge the ingot, forging temperature should be not less than 850℃
Cooling in the air after forged
7: Heat treatment
Soft annealed:
Heat 20NiCrMo2-2 steel to 820-850℃ in the furnace
Soak at this temperature in the furnace
Cooling in the furnace or in the air
Normalized:
Heat 20NiCrMo2-2 steel to 880-920℃ in the furnace
Soak at this temperature in the furnace
Cooling in the air
End quench test Austenitizing temperature: 920℃
Carburizing temperature: 880-980℃
Core-hardening temperature: 860-900℃
Case-hardening temperature: 780-820℃
Quenching and tempering:
Heat 20NiCrMo2-2 steel to 850-880℃ in the furnace
Soak at this temperature in the furnace
Quench in water or oil
Temper steel at 150-200℃ in the furnace
Take out of 20NiCrMo2-2 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
20NiCrMo2-2 steel has good weldability. For steel materials, weldability is strongly influenced by the carbon content. When the carbon content exceeds 0.25%, the weldability decreases. The carbon content of 20NiCrMo2-2 is usually in the range of 0.17% - 0.23%, which is relatively moderate.
9：Application
20NiCrMo2-2 steel has excellent hardenability, strength, toughness and fatigue strength. The following are its main application uses.
1）：Gear manufacturing: Gears for automobiles, industrial machinery, wind power equipment.
Shaft parts: transmission shafts and crankshafts for automobiles and heavy machinery.
2）：Fasteners: high-strength bolts, nuts, etc.
3）：Tools and molds: cold work molds, stamping tools, etc.
4）：Other mechanical parts: connecting rods, pins, etc.
