Manganese Chromium Steel for Machine Structural use

It has good hardenability and machinability, and can be used as a tempered steel after heat treatment. It has low quenching deformation, good low temperature toughness, good strength and toughness, but low weldability. By increasing the manganese content and adding trace amounts of chromium, the oil quenching process avoids the hardening cracks and deformation caused by water quenching of normal high carbon steels. Better toughness and hardening properties (deeper hardening) than normal high-carbon steels. Easy to process, high hardness and wear resistance of general high-carbon steel.

Product Applications

It is suitable for the manufacture of pistons, bolts, gears, spindles, worm gears, worm gears, seal bushings, various kinds of punching dies, saw blades, hairpins and other parts...and other mechanical components that require high hardness and wear resistance.

15CrMn (worm)

It has good hardenability and machinability, high surface ha

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15CrMn (worm)

It has good hardenability and machinability, high surface hardness and good wear resistance. It can be used to replace 15CrMo.

It has good process performance and welding performance, and has high lasting strength at 500~550℃.

When the temperature exceeds 550 ℃, the oxidation resistance becomes worse, creep strength significantly reduced.

Long-term at 500 ~ 550 ℃, the thermal strength of the steel is reduced, the strength is reduced.

Used in the manufacture of 510 ℃ high and medium pressure steam conduit, collector and tube wall temperature of 550 ℃ superheater and forgings.

It can also replace 20CrNi steel for parts with small cross-sectional size, medium pressure and no large impact load.

Used in the manufacture of gears, worm gears, plastic molds, steam turbine oil seals and steam shaft bushings, etc.

Tie rods, important welding and stamping parts, high strength structural parts
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16MnCr5 (Camshaft)

16MnCr5 gear steel has good hardenability and machinability.

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16MnCr5 (Camshaft)

16MnCr5 gear steel has good hardenability and machinability. For larger cross-sectional parts, heat treatment can give higher surface hardness and wear resistance, and higher low-temperature impact toughness.

16MnCr5 gear steel is carburized and quenched, so this grade of steel is carburized steel and is mainly used in the manufacture of gears, worm shafts, seal bushings, cam shafts, drive wheels, clutch plates and other parts.

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SMnC420 (Auto Axle Bushing)

It is a carburized steel with good hardenability. It has hig

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SMnC420 (Auto Axle Bushing)

It is a carburized steel with good hardenability. It has high surface hardness and good wear resistance.

It is used in the manufacture of gears, worm gears, plastic molds, steam turbine oil seals and steam shaft bushings, etc.

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20CrMn (Clutch Kit)

20CrMn is used for shafts and connecting rods working under

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20CrMn (Clutch Kit)

20CrMn is used for shafts and connecting rods working under high speed and high bending load, gear shafts, gears, pump rotors, clutches, small shafts working under high speed and high load without strong impact load.

Carburized steel has better strength and heat treatment properties than quenched, less deformation, good low temperature toughness, better machinability, but low welding properties.

It is used for the manufacture of tempered parts of large cross-section and carburized parts of small cross-section for heavy load, and also for the manufacture of small and medium-sized parts with medium load and low impact.

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5120 (Piston pin)

5120 has high strength and hardenability, but poor toughness

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5120 (Piston pin)

5120 has high strength and hardenability, but poor toughness. It is mostly used for carburized parts (oil quenching) with high core strength requirements, surface abrasion, cross-section less than 30 mm or complex shapes with little load.

For parts with small heat treatment deformation and high wear resistance, high frequency surface quenching should be carried out after carburizing, such as gears, shafts, spline shafts with modulus less than 3.

This steel can also be used in a tempered condition for parts with high working speed and medium impact load. It is used in machine gearbox gears, gear shafts, cams, worm gears, piston pins, claw clutches...etc.

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20MnCr5 (Friction Wheel)

Carburized steel, characteristics: high strength, high tough

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20MnCr5 (Friction Wheel)

Carburized steel, characteristics: high strength, high toughness, good hardenability.
It is a type of carburizing steel and can also be used as a tempering steel.

They have low quenching deformation, good low-temperature toughness, and good machinability.

However, it has low weldability and is generally used after carburizing and quenching or quenching.

It can be used as carburized parts and quenched parts with large cross-section and high load.

Such as gears, shafts, worm gears, governor sleeves, friction wheels, etc.

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20CrMnSi (Mining Chain)

It is used to manufacture welded parts with high strength, w

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20CrMnSi (Mining Chain)

It is used to manufacture welded parts with high strength, welded structures with high strength and high working stress.

high toughness parts and thin sheet stamping parts with thickness less than 4 mm.
In the manufacture of small cross-sectional size parts, its performance is not inferior to that of CrMo steel.

So in some cases can be used interchangeably.

Used in the manufacture of stronger welded parts, tougher parts subjected to tension, and the thickness of less than 16mm thin plate stamping parts.

As well as the thickness of less than 16mm thin plate stamping parts, cold-drawn parts, cold-stamping parts, such as mining equipment in the larger parts.

For example, the chain, chain ring and bolt of large cross-section in mining equipment.

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30CrMnSi (Grinding Wheel Shaft)

High strength tempering has high strength, weldability, toug

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30CrMnSi (Grinding Wheel Shaft)

High strength tempering has high strength, weldability, toughness, high permeability, medium cold shape, good cutting performance.

There is a tendency of tempering brittleness, poor lateral impact toughness welding performance is better, but when the thickness of 3mm, should first heat to 150, after welding heat treatment.

After general tempering, 30CrMi is used in the following applications.

It is also used to make wear-resistant parts with low working temperature and welded components with variable load, such as impeller of high pressure blower, valve plate and non-corrosive pipes and tubes.

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35CrMnSiA

35CrMnSiA is a low-alloyed ultra-high strength steel, which

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35CrMnSiA

35CrMnSiA is a low-alloyed ultra-high strength steel, which is generally used after tempering.
It has good combined mechanical properties after heat treatment.

It has high strength, sufficient toughness, good hardenability, weldability (preheating before welding), and processability.

However, the corrosion resistance and oxidation resistance is low, and it is generally used after low-temperature tempering or isothermal quenching.

It is used in the manufacture of medium speed, heavy load, high strength, high toughness parts and high strength components.
Such as gears, shafts, clutches, sprockets, grinding wheel shafts, shaft sleeves, bolts, nuts, etc.

Also used in the manufacture of wear-resistant, low-temperature parts, variable load welding components.
Such as high-pressure blower blades, valve plates and non-corrosive piping pipes.

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Steel data

Standard Code Spec No. Material No. Mark
GB 3077 15CrMn
AISI 5115
DIN 17210 1.7131 16MnCr5
CNS 4445 SMnC420
GB 3077 20CrMn
JIS 4106 SMnC420
AISI 5120
DIN 17210 1.7147 20MnCr5
GB 3077 20CrMnSi
GB 3077 30CrMnSi
GB 3077 35CrMnSiA
(C)% (Si)% (Mn)% (P)% (S)% (Ni)% (Cr)% (Cu)% Yield strength(Mpa) Tensile strength(Mpa) Elongation(%)
0.12~0.18 0.17~0.37 1.1~1.4 ≦ 0.035 ≦ 0.035 ≦ 0.3 0.4~0.7 ≦ 0.3 ≧ 590 ≧ 785 ≧ 12
0.13~0.16 0.15~0.3 0.7~0.9 ≦ 0.035 ≦ 0.04 0.7~0.9
0.14~0.19 0.15~0.4 1~1.3 ≦ 0.035 ≦ 0.035 0.8~1.1
0.17~0.23 0.15~0.35 1.2~1.5 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.35~0.7
0.17~0.23 0.17~0.37 0.9~1.2 ≦ 0.035 ≦ 0.035 ≦ 0.3 0.9~1.2 ≦ 0.3 ≧ 735 ≧ 930 ≧ 10
0.17~0.23 0.15~0.35 1.2~1.5 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.35~0.7 ≦ 0.3
0.17~0.22 0.15~0.3 0.7~0.9 ≦ 0.035 ≦ 0.04
0.17~0.22 ≦ 0.4 1~1.4 ≦ 0.035 ≦ 0.035 1~1.3
0.17~0.23 0.9~1.2 0.8~1.1 ≦ 0.035 ≦ 0.035 ≦ 0.3 0.8~1.1 ≦ 0.3 ≧ 635 ≧ 785 ≧ 12
0.27~0.34 0.9~1.2 0.8~1.1 ≦ 0.035 ≦ 0.035 ≦ 0.3 0.8~1.1 ≦ 0.3 ≧ 885 ≧ 1,080 ≧ 10
0.32~0.39 1.1~1.4 0.8~1.1 ≦ 0.035 ≦ 0.035 1.1~1.4 ≧ 1,280 ≧ 1,620 ≧ 9