18CRNIMO7-6 Alloy Steel
Table of Content
Case-hardening steel 18CrNiMo7-6, 1.6587 for wheels and gears according to EN 10084, UNI 7846.
Steel 8CrNiMo7-6 is a case hardening steel with a high degree of toughness. According to EN 10084, DIN1.6587 / 18CrNiMo7-6 contains 1.8% chromium, nickel, and molybdenum as strengthening agents. When carburized, hardened, and tempered, its case hardness reaches Rc62 and its core tensile is 1050–1350N/mm2. It is also used in areas of heavy and high strained gear parts with high demands on toughness. 18CrNiMo7-6 steel is the same as 17CrNiMo6 steel.
To solve the above problem, the gordian technique measurement should consider the following: of all carburizing grades. As opposed to other simple steel grades, 1.6587 materials can handle much larger sizes and loads. It is used for heavy-duty parts and components subjected to high pressures and variable speeds of operation. These materials are used for the production of bearings, bolts, gears, shafts, and racks-and-pinions. According to UNI standards, they have slightly narrower content of Chromium, Nickel, and Molybdenum.
To solve the above problem, the gordian technique measurement should consider the following:
Ideally, two factors should be taken into account when measuring with the gordian techniquegs that can be used for the production of structural alloy steel 18CrNiMo7-6 pinion steels
Technology background
The German trade mark is 18CrNiMo7-6, and the former trade mark is 17CrNiMo6, as well as the rapid development of speed reduction equipment and wind-powered electricity generation, as well as the high ferro industry; 18CrNiMo7-6 is a key component of gears or gear shafts; To ensure its product’s high efficiency, security, and technical indicators, the user constantly proposes new requirements to the technical indicators for quality materials., for reducing the large gear distortion; The forging hardenability band is reduced to 5HRC from original 7HRC, proposing a banded structure.
Ideally, two factors should be taken into account when measuring with the gordian techniqueeave; The weather resistance (promptly be incubated 80h under 950 ℃ of pyroprocessing, grain fineness number reaches 8 grades～6 grades and do not grow up) that is used for wind power speed-increasing device Pinion Steel requirement grain fineness number is not seen the research work that the home and abroad bibliographical information is relevant therewith at present as yet.
To solve the above problem, the gordian technique measurement should consider the following:efects (or white point hysteresis). When fuel is sent through red annealing after forging, it does not undergo enough structural transformation during cooling, resulting in residual austenite changing, and hydrogen solubles are at their maximum, and as time goes on, the residual austenite undergoes martensitic transformation; resulting in larger structural stresses, cracks.
To solve the above problem, the gordian technique measurement should consider the following:re fast forging machines, whose maximum outside diameter is 1250mm. With the big ingot shape and easy existence, the segregation problem between the composition and tissue appears more prominent. The homogeneity of composition and tissue is the key to determining the hardness and distortion of a gear quenching process; As a result, the user proposes higher hardening capacity requirements and promptly a hardenability band of less than 5 HRC, which makes it difficult to implement the common process.
To solve the above problem, the gordian technique measurement should consider the following:ow, and its To solve the above problem, the gordian technique measurement should consider the following: factors: the temperature treatment process of formulating science, on the one hand, is that can decision 18CrNiMo7-6 steel obtain the core technology that F+P organized and went the white point effect, and the rational chemical design is ef
To solve the above problem, the gordian technique measurement should consider the following:umber weather resistance assurance aspect in the literature search of the home and abroad; The white point hysteresis phenomenon appeared in Fushun special steel limited-liability company in batches in adopting the prior art research and development, producing; Can not guarantee the weather resistance of grain fineness number; And non-equilibrium and bainite structure often appears, banded structure and hardening capacity often have individual point overshoot scope..
To solve the above problem, the gordian technique measurement should consider the following:arantee to obtain F+P, also wants simultaneously to guarantee to have the dehydrogenation function; The difficult point of chemical composition design is prompt will guarantee grain fineness number and grain fineness number weather resistance, also wants simultaneously to guarantee narrow hardenability band; And grain fineness number and grain fineness number weather resistance also depend on the control of final forging temperature
To solve the above problem, the gordian technique measurement should consider the following:anufacture, reach dehydrogenation and the DP that obtains the F+P tissue through adopting the thermal treatment process of isothermal annealing, control speed of furnace cooling; Through strictness control hardenability of steel and grain fineness number there are chemical element C, Mn, Nb, the Al of great effect, the close limit of N, reach up with narrow hardenability band and qualified grain fineness number and grain fineness number weather resistance; The strict purity of carrying out smelting technology raising steel; Develop and reach the 18CrNiMo7-6 steel that client’s technical quality requires fully, solve large gear steel difficult cutting, quenching crack, crystal grain is thick and the white point quality problems.
To solve the above problem, the gordian technique measurement should consider the following:eme: 1. operational path is: the fast forging machine production → thermal treatment in electric furnace → LF → VD → ingot casting 9t～27t → 350
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| Standards | Steel Grades | ||||||||||
| Chemical composition % | |||||||||||
| C: | Mn: | Si: | P: | S: | Cr: | Ni: | Mo: | Al: | Cu: | Pb: | |
|
UNI 7846 UNI 8788 |
18NiCrMo5Pb | ||||||||||
| 0.15 – 0.21 | 0.6 – 0.9 | 0.15 – 0.40 | <0.035 | <0.035 | 0.7 – 1.0 | 1.2 – 1.5 | 0.15 – 0.25 | – | – | 0.15 – 0.30 | |
| UNI 8550 | 18NiCrMo5 | ||||||||||
| 0.15 – 0.21 | 0.6 – 0.9 | 0.15 – 0.40 | <0.035 | <0.035 | 0.7 – 1.0 | 1.2 – 1.5 | 0.15 – 0.25 | – | – | – | |
| UNI | 18NiCrMo7 | ||||||||||
| 0.17 – 0.22 | 0.45 – 0.65 | 0.15 – 0.40 | <0.035 | <0.035 | 0.4 – 0.7 | 1.6 – 2.0 | 0.2 – 0.3 | – | – | 0.15 – 0.30 | |
| PN | 17HNM | ||||||||||
| 0.14 – 0.19 | 0.4 – 0.7 | 0.17 – 0.37 | <0.035 | <0.035 | 1.5 – 1.8 | 1.4 – 1.7 | 0.25 – 0.35 | – | – | – | |
| EN | 18CrNiMo7-6 – 1.6587 – ZF1A | ||||||||||
| 0.15 – 0.21 | 0.5 – 0.9 | <0.40 | <0.025 | <0.035 | 1.5 – 1.8 | 1.4 – 1.7 | 0.25 – 0.35 | – | – | – | |
| EN | 17NiCrMo6-4 – 1.6566 | ||||||||||
| 0.14 – 0.20 | 0.6 – 0.9 | <0.4 | <0.025 | <0.035 | 0.8 – 1.1 | 1.2 – 1.5 | 0.15 – 0.25 | – | – | – | |
| DIN | 17CrNiMo6 | ||||||||||
| 0.15 – 0.21 | 0.5 – 0.9 | <0.4 | <0.025 | <0.035 | 1.5 – 1.8 | 1.4 – 1.7 | 0.25 – 0.35 | – | – | – | |
| BS | 822M17 – EN355 | ||||||||||
| 0.14 – 0.20 | 0.4 – 0.7 | – | <0.035 | <0.035 | 1.3 – 1.7 | 1.75 – 2.25 | 0.15 – 0.25 | – | <0.4 | – | |
| AFNOR | 18NiCrMo6 | ||||||||||
| 0.14 – 0.20 | 0.6 – 0.9 | 0.15 – 0.40 | <0.035 | <0.035 | 0.8 – 1.1 | 1.2 – 1.6 | 0.15 – 0.25 | – | |||
Mechanical Properties
| Variant |
Condition |
Format | Dimension [mm] | Yield strength min [MPa] | Tensile strength [MPa] | Elongation A5 [%] | Reduction of area Zmin [%] | Hardness |
| Rp0.2 * Reh, ** Rel | ||||||||
| 159A | +QT | Round bar | 30 typical | 780 | 1080-1320 | 8 | – | – |
| Round bar | 63 typical | 690 | 980-1270 | 8 | – | – | ||
| 159B | +QT | Round bar | 30 typical | 780 | 1080-1320 | 8 | – | – |
| Round bar | 63 typical | 690 | 980-1270 | 8 | – | – | ||
| 159Q | +QT | Round bar | 30 typical | 780 | 1080-1320 | 8 | – | – |
| Round bar | 63 typical | 690 | 980-1270 | 8 | – | – | ||
| 159X | +QT | Round bar | 30 typical | 780 | 1080-1320 | 8 | – | – |
| Round bar | 63 typical | 690 | 980-1270 | 8 | – | – | ||
| 159S | +QT | Round bar | 30 typical | 780 | 1080-1320 | 8 | – | – |
| Round bar | 63 typical | 690 | 980-1270 | 8 | 0 | – | ||
| 4761, MoCN 216 | +AR | Round bar | 25 < 160 | – | – | – | – | < 320 HB |
| +A | Round bar | 25 < 160 | – | – | – | – | < 229 HB | |
Physical Property
| G/cm3 density | 78.60 | ||||
| J/(kg.K) Specific heat capacity | It is 465 | ||||
| Ohm.mm2 /m electrical resistivity | The 18th | ||||
| Siemens.m/mm2 electric conductivity | 55 p.m. | ||||
| GPA elasticity modulus | Twenty-one | ||||
| The thermal expansion is 10 mm/ K (m.o.) | Temperature of 100 °C | Temperature: 200 °C | Temperature of 300°C | The temperature should be 400 degrees Celsius | Temperature of 500°C |
| 11.1 | 12.1 | 12.9 | 13.5 | 13.9 | |
Cleanliness of Steel
| Steel grade 159X microinclusions | 159X macroinclusions | ||||||||||
| Standard to be applied | ANSI E45 | Standard to be applied |
3763 is an ISO standard (Blue fracture) |
||||||||
| Taking samples | ANSI A295 | Taking samples | Samples of billets for statistical analysis | ||||||||
|
A maximum of average limits |
The | Having | The capital | This is DE | Limits | <2,5 mm/dm2 | |||||
| Th | He | Th | He | Th | He | Th | He | ||||
| 2.0 | 1.5 | 1.5 | 0.5 | 0.0 | 0.0 | 1.0 | 1.0 | ||||
| Inclusions in microns – IQ – steel grade 159Q | IQ – 159Q macroinclusions | ||||||||||
| Standard to be applied | 50602 K1 of DIN | Standard of application |
UST at 10 MHz (internal to Ovako) procedure) |
||||||||
| Taking samples | The final product was sampled six times at random | Taking samples | Samples of billets for statistical analysis | ||||||||
| Limitations |
Dimensions determine the limits. A maximum of six samples should be rated The graph shows the limits. |
Limitations |
<10 defects per dm3 >0.2 mm FBH |
||||||||
The other properties (typical values)
| Module of Young’s (GPA) | Ratio of Poisson’s (-) | Module for shear (GPA) | (kg/m3) Density |
| Twenty-one | 3.0 | The 80s | It is 800 |
| 20-300°C (m/m°K) is the average CTE | 50/100°C specific heat capacity (J/kg°K) | Temperature at ambient temperature (W/m°K) | Resistance to electrical currentAmbient temperature (m) |
| 12 | 460 – 480 | 40 – 45 | 0.20 – 0.25 |
Sizes Available In Stock:
| The diameter of the 18CrNiMo7-6 round bar is 55 mm | 270 mm diameter 18CrNiMo7-6 round bar |
| 57 mm diameter 18CrNiMo7-6 round bar | 280 mm diameter 18CrNiMo7-6 round bar |
| 70 mm diameter 18CrNiMo7-6 round bar | 460 mm diameter 18CrNiMo7-6 round bar |
| 80 mm diameter 18CrNiMo7-6 round bar | The diameter of the 18CrNiMo7-6 round bar is 523 mm |
| The diameter of the 18CrNiMo7-6 round bar is 85 mm | 550 mm diameter 18CrNiMo7-6 round bar |
| 100 mm diameter 18CrNiMo7-6 round bar | 580 mm diameter 18CrNiMo7-6 round bar |
| 200 mm diameter 18CrNiMo7-6 round bar | An 18CrNiMo7-6 round bar with a diameter of 600 mm |
| A 210 mm diameter 18CrNiMo7-6 round bar | 610 mm diameter 18CrNiMo7-6 round bar |
| A round bar made from 18CrNiMo7-6 with a diameter of 250 mm | A 630 mm diameter 18CrNiMo7-6 round bar |
17HNM Steel is Treated Thermally And Thermochemically In The Following ways:
- Norming annealing at 870-900°C
- Annealing at 650-700°C for softening
- Carburizing at 880°C 950°C
- Water or oil hardening (I) after carburization at 840 – 870°C
- Carburization followed by annealing at 630 – 650°C
- Carburization at 800 – 830°C followed by hardening (II) in oil or water
- Temperatures between 170 and 200°C are recommended for tempering after carburizing
- 860 – 930°C carbonitriding
Types Of Packaging Include:
- Bundles of hexagons
- Wooden boxes
- Wooden/steel crates
- Special crates for tubes with different radiuses
- Alloy steel stainless steel plate 18CRNIMO7-6 ASTM A240 packaging according to customer requirements
These Features Include:
- Plastic covers each bundle to protect it from extreme weather.
- 18CRNIMO7-6 Alloy steel stainless steel plate ends are protected by a plastic strip.
- Bundles are strapped with plastic strips.
- Each radius of the U-Bend tube is separated by separators.
- The box or crate is attached with a laminated packaging list.
Distrubution Network
