What is SNCM220H material?

SNCM220 belongs to the Japanese standard nickel-chromium-molybdenum alloy structural steel, and the executive standard: JIS G4053-2008

The chemical composition of SNCM220 is shown in the following figure:

<>SNCM220 has high hardenability, no tempering brittleness, good weldability, little tendency to form cold cracks, good machinability and cold strain plasticity. It is generally used in the state of quenching and tempering or carburizing and quenching. It is commonly used in the manufacture of gears in the engine and transmission system of small and medium-sized cars and tractors; It can also manufacture carburized parts and cyanide parts that require high core performance, such as the claws and cone bodies of cone bits used in oil drilling and metallurgical open-pit mines.

SNCM220 can withstand a certain temperature because of its molybdenum content, in addition to its good comprehensive properties. It is used in the manufacture of steam turbine gears, rotors, internal combustion engines, connecting rods, and valve cross-section forgings.

SNCM220H bearing steel, SNCM220 corresponds to the domestic grade 20CRNIMOA, details:

Carburizing) bearing steel: SNCM220H

Executive standard: JIS G4053-2003

Characteristics and scope of use:

It is a commonly used alloy carburizing steel, the surface has quite high hardness, wear resistance and contact fatigue strength after carburizing treatment, and the core still retains good toughness and can withstand high impact loads. It is mainly used as a material for impact-resistant and wear-resistant parts such as automobile bearings.

Chemical Composition: Carbon C: Allowable Deviation:

Silicon SI: Allowable Deviation:

Manganese mn: Allowable deviation:

Sulfur s : Allowable deviation: +

Phosphorus p : Allowable deviation: +

Chromium CR: Allowable deviation:

Nickel ni: Allowable deviation:

Copper cu: Allowable deviation:

Molybdenum mo: Allowable deviation:

Mechanical properties: tensile strength b (mpa): 1176(120).

Elongation δ5 (9

Section shrinkage 45

Impact toughness value kv (j cm2): 78(8).

Specimen size: The specimen size is 15mm

Heat treatment specifications and metallographic structure:

Heat treatment specification: quenching, the first 880 20, the second 790 20, oil cooling; Tempered, 150 200, air-cooled.

Metallographic structure: martensite.

Delivery Condition: Hot-rolled or forged steel is delivered in hot-rolled (forged) or annealed condition. Cold-drawn steel is delivered in annealed condition (13524351833).

(Carburized) bearing steel: SNCM220

Executive standard: JIS G4053-2003

Corresponding US grade: 8620

Corresponding British grade: 805m20

Corresponding French grade: 20NCD2

Chemical composition. Carbon C: Allowable Deviation:

Silicon SI: Allowable Deviation:

Manganese mn: Allowable deviation:

Sulfur s : Allowable deviation: +

Phosphorus p : Allowable deviation: +

Chromium CR: Allowable deviation:

Nickel ni: Allowable deviation:

Copper cu: Allowable deviation:

Molybdenum mo: Allowable deviation:

Mechanical properties. Tensile strength b (mpa): 1176(120)elongation δ5 (%9

Section shrinkage 45

Impact toughness value kv (j cm2): 78 (8) Specimen size: The specimen size is 15mm

Heat treatment specifications.

Quenching, first 880 20, second 790 20, oil cooled; Tempered, 150 200, air-cooled.

Metallographic organization. Martensite.

Delivery status. Hot-rolled or forged steel is delivered in hot-rolled (forged) or annealed condition. Cold-drawn steel is delivered in annealed condition.

Let me tell you:

Chromium-molybdenum steel is an alloy of chromium and molybdenum.

Its performance is as follows: 1. Good quenchability, can be deep quenching, instead of the surface quenching of anti-saw-shaped locks on the market 2 Less brittleness tendency to temper 3 Good high temperature processability, beautiful after processing 4 Good weldability 5 Good impact absorption performance, hammer smashed up will be with ** feeling, can not be violently destroyed Advantages of chromium molybdenum steel (1) Good processability (2) Good impact absorption performance (3) Easy welding Element symbol: CR-MO

Hope it helps!

SNC22 belongs to the Japanese standard "Chromium-nickel alloy structural steel", and the executive standard: JIS G4102-1979

The chemical composition of SNC22 is shown in the figure below

SNC22 is a widely used high-grade carburizing steel with high strength, plasticity and hardenability. It is mainly used to make spindles that require high strength, high hardness and high toughness under heavy load conditions, shafts and rods that require high central toughness or bear impact load, surface wear resistance, and small heat treatment deformation, as well as various transmission gears, adjusting screws and camshafts that work under high speed and impact load.

SNC22 is a Japanese alloy carburized steel grade.

SNC22 Chemical Composition:

Carbon C: Silicon Si:

Manganese mn:sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni:

Copper cu:

It is equivalent to 12CrNi3A in our country, as shown in the figure below

SNC22 is a Japanese standard high-grade carburized steel structural steel.

SNC815 (SNC22) alloy steel.

Japanese Standard: JIS G 4053-2008

Characteristics of Japanese SNC815 carburizing steel: SNC815 is a high-grade carburizing steel, which is an alloy steel steel for mechanical structures in Japan, belonging to nickel-chromium (Ni-CR) steel type alloy structural steel, contained in the Japanese industrial standard JIS G 4053, SNC815 steel has the highest tensile strength among Japan's nickel-chromium steel series alloy steels, with the highest hardness (up to 388HBS) and the largest hardness range (285 388HBS). Due to the action of nickel element, therefore, SNC815 steel has high hardenability, wear resistance and corrosion resistance, and Japanese SNC815 alloy structural steel is used to manufacture various carburizing parts that bear heavy loads and require high strength, high hardness, high toughness and corrosion resistance.

Chemical Composition: Carbon C:;

Silicon si:;

Manganese mn:;

Phosphorus p: sulfur s:

Nickel Ni: Chromium Cr:

Note: The allowable deviation of chemical composition is as specified in JIS G 0321.

Carbon C: Allowable Deviation:

Silicon excavator si: permissible deviation:

Manganese mn: type old allowable deviation:

Sulfur s : Allowable deviation: +

Phosphorus p : Allowable deviation: +

Chromium CR: Allowable deviation:

Nickel ni: Allowable deviation:

Copper cu: Allowable deviation:

Molybdenum mo: allowable deviation judgment lease:

SNC22 belongs to the Japanese standard "Chromium-nickel alloy structural steel", and the executive standard: JIS G4102-1979

The chemical composition of SNC22 is shown in the figure below

SNC22 is a widely used high-grade carburized steel cracked with high strength, plasticity and hardenability. It is mainly used to make spindles that require high strength, high hardness and high toughness under heavy load conditions, shafts and rods that require high central toughness or bear impact load, surface wear resistance, and small heat treatment deformation, as well as various transmission gears, adjusting screws and camshafts that work under high speed and impact negative source load.

Steel grade: SNC22

Steel group series: CRNI

Product Name: Alloy Structural Steel.

Implement the Luyan standard: JIS G4053-2003 old Japanese standard.

Delivery status: annealed or tempered at high temperature, the specific delivery status should be indicated in the warranty letter.

Examples of SNC22 uses:

It is used to manufacture important carburizing or carbonitriding parts with large cross-section, heavy load, good toughness, impact resistance and wear, such as transmission shafts, gears, spindles, camshafts, bushings, pulleys, mandrels, connecting rods, valve trays, piston pins, piston expansion rings, universal coupling crossheads, important screws, adjusting screws, etc

SNC22 heat treatment process:

Quenching: 860 for the first time, 780 for the second insight, oil cooling;

Tempering: 200, water-cooled, air-cooled.

Note: The factory delivery condition is annealed, and quenching and tempering are required before use.

SNC22 Chemical Composition Range Values:

Note: The actual chemical composition is subject to the warranty of the steel mill.

Carbon C: Silicon Si:

Manganese mn:phosphorus p:

Sulfur S: Chromium Cr:

Nickel Ni: Copper Cu:

SNC22 mechanical properties range value:

Note: The actual mechanical properties are subject to the warranty of the steel mill.

Elongation δ5 (%)11 Hardness: 219HB

Specimen size: The specimen blank size is 22mm

Yield strength s(mpa): 770

Tensile Strength b(MPa): 980

Elongation δ5 (%)12

Section shrinkage 45

Impact power AKV(J): 78

Hardness: 825-388HBW

SNC22 Features:

SNC22 is a high-grade permeable steel, which can obtain good comprehensive mechanical properties after quenching and low-temperature tempering or high-temperature tempering, with good low-temperature impact toughness and low notch sensitivity. The machinability and weldability are good, but there is a tendency of tempering brittleness, and the sensitivity to white spots is high.