Chromium Steel for Machine Structural use

Chromium Steel for Machine Structural use

Cr. is one of the elements added to heat-resistant steel. Cr. steel stands for alloy steel that contains Cr. and features material hardness, wear-resistance, corrosion and rust resistance and applicability for making machinery and tools. Cr. can offer higher anti-oxidation and corrosion resistance. In order to possess specific performances for different environment, some chemical elements such as Mo., V., W., Ti., Nb. And B., etc. are added to. For example, if 1% Cr. is added to, the hardenability and high temp. tempering resistance will increase and obtain tissue of higher toughness.

Product Applications

This alloy possesses high anti-oxidation and anti-erosion, so it has been used to produce flame stabilizer of gas turbine and thermal-couple bushing of ethylene-fraction-furnace, and so on.

SCr415 (piston rings)

SCr415 (DIN 15Cr3) alloy structural steel is a commonly used

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SCr415 (piston rings)

SCr415 (DIN 15Cr3) alloy structural steel is a commonly used low-carbon alloy carburizing steel with high cold deformation plasticity, good weldability, and good machinability in the annealed state.

SCr415 is used for carburized parts with high working speed but small cross-section and high core toughness, such as bushings, crank pins, piston pins, piston rings, couplings, and gears, cams, Shafts and bearing rings, screws for ship main engines, small parts of locomotives, steam turbine rings, etc.

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SCr440 (sliders)

SCr440 (sliders) One of the widely used steel grades, used t

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SCr440 (sliders)

SCr440 (sliders) One of the widely used steel grades, used to manufacture high-hardness and wear-resistant parts such as gears, shafts, spindles, crankshafts, socket rods, intake valves, sliders, etc.

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SCr420 (Cam)

SCr420 alloy structural steel is a steel that implements the

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SCr420 (Cam)

SCr420 alloy structural steel is a steel that implements the JIS G4053-2003 standard. It is used to manufacture various carbon-permeable or carbon-helium infiltrated parts with small cross-section, simple shape, high speed, small load, surface wear resistance, and high core.

SCr420 alloy structural steel has higher strength and hardenability. 15Cr steel has poor toughness; it has better weldability and generally does not require heat treatment after welding. SCr420 is used for carburized parts with high core strength requirements and abrasion on the surface, large size, or complex shape without heavy load, such as gears, gear shafts, cams, piston pins, worms, etc. SCr420 is also available For hardened and tempered parts with high working speed and medium impact load.

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SCr445(pins)

It is mainly used to manufacture more important parts, and c

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SCr445(pins)

It is mainly used to manufacture more important parts, and can also be used for various parts with higher load-bearing and wear resistance requirements after high-frequency surface quenching, such as gears, sleeves, shafts, pins, etc.

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Steel data

Standard Code Spec No. Material No. Mark
CNS 3231 SCr415
JIS G4104 SCr415
DIN 17210 1.7015 15Cr3
CNS 3231 SCr420
JIS G4104 SCr420
AISI 5120
CNS 3231 SCr430
JIS G4104 SCr430
AISI 5130
AISI 5132
CNS 3231 SCr435
JIS G4104 SCr435
AISI 5135
CNS 3231 SCr440
JIS G4104 SCr440
AISI 5140
(C)% (Si)% (Mn)% (P)% (S)% (Ni)% (Cr)% (Cu)% (Se)%
0.13~0.18 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.2 ≦ 0.3
0.13~0.18 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.2 ≦ 0.3
0.12~0.18 0.15~0.4 0.4~0.6 ≦ 0.035 ≦ 0.035 0.4~0.7
0.18~0.23 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.2 ≦ 0.3
0.18~0.23 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.2 ≦ 0.3
0.17~0.22 0.15~0.3 0.7~0.9 ≦ 0.035 ≦ 0.04 0.7~0.9
0.28~0.33 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.2 ≦ 0.3
0.28~0.33 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.2 ≦ 0.3
0.28~0.33 0.15~0.3 0.7~0.9 ≦ 0.035 ≦ 0.04 0.8~1.1
0.3~0.35 0.15~0.3 0.6~0.8 ≦ 0.035 ≦ 0.04 0.75~1
0.33~0.38 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.2 ≦ 0.35
0.33~0.38 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.03 ≦ 0.25 0.9~1.2 ≦ 0.35
0.33~0.38 0.15~0.3 0.6~0.8 ≦ 0.035 ≦ 0.04 0.8~1.05
0.38~0.43 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.04 ≦ 0.25 0.9~1.2 ≦ 0.3
0.38~0.43 0.15~0.35 0.6~0.85 ≦ 0.03 ≦ 0.04 ≦ 0.25 0.9~1.2 ≦ 0.3 ≦ 0
0.38~0.43 0.15~0.3 0.7~0.9 ≦ 0.035 ≦ 0.04 0.7~0.9