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317L Round Bar

18CRNIMO7-6 Alloy Steel 

Table of Content

Tronix Alloy is a Stockist, Supplier & Exporter of 18CrNiMo7-6 Round Bars in India.

Case-hardening steel 18CrNiMo7-6, 1.6587 for wheels and gears according to EN 10084, UNI 7846.

    Heat-treatable, low alloy steel containing nickel, chrome, and molybdenum as per DIN Germany standard, 18CrNiMo7-6/1.6587 Alloy Steel is known for its toughness and ability to develop high strength when heat-treated while maintaining good fatigue strength even after heat treatment. In addition to shafts, gears, axles, spindles, couplings, and pins, 18CrNiMo7-6/1.6587 alloy steel is widely used.

    The Gordian technique measurement should consider the following: of all carburizing grades. Compared to simple steel grades, 1.6587 materials can handle larger sizes and loads. According to UNI standards, it is used for heavy-duty parts and components subjected to high pressures and variable operating speeds.

    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 techniques that can be used for the production of structural alloy steel 18CrNiMo7-6 pinion sheets of steel

    Technology background

    The German trademark is 18CrNiMo7-6, and the former trademark 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 technique-eave; The weather resistance (promptly be incubated 80h under 950 ℃ of preprocessing, 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 in addition to that at present as yet.

    To solve the above problem, the Gordian technique measurement should consider effects (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. As time passes, the residual austenite undergoes a martensitic transformation, resulting in larger structural stresses and 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 of

     To solve the above problem, the Gordian technique measurement should consider the following: the number of weather resistance assurance aspects 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 appear, banded structure and hardening capacity often have an individual point overshoot scope.

    To solve the above problem, the Gordian technique measurement should consider the following: guarantee 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: manufacture, 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

    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

    General Features

    As a case of hardening steel with a high level of toughness, 18CrNiMo7-6 is available in many variants with high cleanliness requirements. All variants possess a narrower composition range as compared to the standard. A variant of steel is produced with IQ (isotropic quality). This will ensure that elongated sulfide inclusions will have very low levels of elongation, resulting in more isotropic properties. As a result of its high oxidic cleanliness, it will meet the same cleanness requirements as remelted steels.

    Grade 159A – A product with a low sulfur content and high cleanliness requirements

    Grade 159B – Contains a controlled sulfur content for consistent machinability and +H hardenability.

    Grade 159Q – This product is characterized by improved isotropy (IQ) and fatigue strength due to the higher cleanliness levels and the finer size distribution of non-metallic inclusions.

    Grade 159X – With controlled sulfur content for consistent machinability and +H hardenability

    Grade 159S – Variant with increased sulfur content.

    Grade 4761(MoCN216) – Low sulfur variant of Imatra

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    Chemical Composition

    C

    0.15 – 0.21

    Si

    max   0.40

    Mn

    0.50 – 0.90

    Ni

    1.40 – 1.70

    P

    max   0.025

    S

    max   0.035

    Cr

    1.50 – 1.80

    Mo

    0.25 – 0.35

    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

     

    Transformation Temperature

    Temperature °C

    MS

    410

    AC1

    726

    AC3

    833

    Heat Treatment

    Treatment

    Condition

    Temperature cycle

    Cooling/quenching

    Hot forging

    +U

    800-1200°C

    In air

    Normalizing

    +N

    860-890°C

    In air

    Carburizing

    +C

    850-930°C   Carbon potential see diagram

    Hardening

    +QT

    840-870°C  

    In oil

    Hardening

    +QT

    780-830°C  Hardening of as-carburized components

    In oil

    Normalizing 
    1. Nominal normalizing temperature:840-890°C
    2. Hold the temperature for several hours
    3. Cooling in the air

    Annealing 
    1. Nominal Annealing temperature:630-650°C
    2. Cool slowly in the furnace
    3. Maximum Brinell hardness of 229

    Hardening and Tempering(QT)  
    1. Nominal Hardening temperature:830-865°C
    2. Hold at this temperature, then quench in oil
    3. Tempering  as soon as possible when the temperature low to the ambient temperature
    4. Heat the steel carefully to a suitable temperature selected by reference to a tempering chart or table
    5. The usual tempering temperature is 600°C which depends on the actual requirements
    6..keep the material out of the furnace, then cool it in the air.

    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.

    Applications:-

    •  Bushings wear pins
    •  Bearings
    •  Sprockets
    •  Gears
    •  Shafts
    It can also be used for high tensile applications, un-carburized but through-hardened and tempered.

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