Cr.Mo.Steel-JUNG YI STEEL

Product Applications

Widely used to make valves, pressured containers that requires high-temp or high-pressure resistance. For instances, Cr. Mo. steel safety valve, gate valve, screw-driver, automobile, pneumatic components, bike parts,…etc.

SCM415 Green-cross

SCM415 is of low-carbon steel alloy (carbon content is sligh

SCM415 Green-cross

SCM415 is of low-carbon steel alloy (carbon content is slightly lower than SCM420). The surface hardness and wear resistance can be enhanced through carburization and nitrocarburizing. The center would remain the toughness, to undergo the impact and weight loading. Therefore, parts such as motor shaft, axis, mechanical parts, car parts, pneumatic parts, piston and gears, which often requires high wear-resistance and loading capacity.

SCM415 Green-cross

SCM415 is of low-carbon steel alloy (carbon content is sligh

SCM415 Green-cross

SCM415 is of low-carbon steel alloy (carbon content is sligh

SCM415 Green-cross

SCM435 Red-cross

SCM435 is of high toughness alloy structural steel, which is

SCM435 Red-cross

SCM435 is of high toughness alloy structural steel, which is often used to make parts that require high-strength, such as bolts, shafts, rods, guiding-post, shaft bushings, gears, automobile assembly parts.

SCM440 Red-cross

The SCM440 is a highly resilient alloy structural steel comm

SCM440 Red-cross

The SCM440 is a highly resilient alloy structural steel commonly known as the Red Cross. Is the production of high-strength work items commonly used steel species, adding Cr, mo elements, with product composition stability, high steel purity, small decarbonization layer, cold rated as low cracking rate, heat treatment quality stability, uniform hardness, good quenching and other advantages, pull strength of 850-1000 Mpa.
Widely used in bolts, shafts, rods, guide columns, spindle sleeve barrels, gears, locomotive components, engines, molds, motors, cold forging parts, screws and other work parts that need strong toughness.

[The code of each country]
SCM440(JIS Japan), 4140(SAE/AISI U.S.), 42CrMo4/1.7225(DIN German), 42CrMo(GB China), SCM440(CNS Taiwan), 42CrMo4(ISO International Standard).

[Conditions of heat treatment]
Annealing: 830℃ Furnace Cooling
Normalization: 830~880℃ Air Cooling
Hardening: 830~880℃ Oil Cooling
Tempering: 530~630℃ Rapid Cooling

[Mechanical properties]
Tensile strength (kgf/mm²): ≧100
Yield strength (kgf/mm²): ≧85
Elongation (%): ≧12
Cross section reduction rate (%): ≧45
Impact value (J/cm2): ≧6
Hardness (Hb) : 285~352

SCM440 Red-cross

The SCM440 is a highly resilient alloy structural steel comm

SCM440 Red-cross

The SCM440 is a highly resilient alloy structural steel comm

SCM440 Red-cross

SCM420

SCM420 is a low carbon alloy structural steel that is suitab

SCM420

SCM420 is a low carbon alloy structural steel that is suitable for carburizing heat treatment. After the carburizing, the hardness of the surface layer of the steel is increased, so that the wear resistance is improved. However, the central part still maintains the toughness and can withstand the impact and load. Often used in the motor shaft, spindle, mechanical parts, pistons and gears and other special wear and load of the workpiece.

[The code of each country]
25CrMo4(EN European Union), (ISO International Standard), 4130(AISI American, SCM420(JIS Japan), 25CrMo4(DIN German), 30CrMn(GB China), 25CD4(ANFOR French), 25CrMo4(KB)(UNI Italy), 55Cr3(UNE Spain), 2225(SS Sweden), 25CrMo4(SFS Finland), 20ChM(GOST Russian), 1717CDS110(BS England)

[Conditions of heat treatment]
Annealing: 850℃ furnace cooling
Normalization: 850~900℃, room temperature air cooling
Quenching: 850~900℃ first oil cooling, 800~850℃ second oil cooling
Tempering: 150~200℃, room temperature air cooling

[Mechanical properties]
Tensile strength (kgf/mm²): ≧95
Elongation (%): ≧14
Multilayer absorption rate (%): ≧40
Impact value (J/cm2): ≧6
Hardness (Hb): 352~362

4145

This is a direct hardening chromium-molybdenum low alloy ste

4145

This is a direct hardening chromium-molybdenum low alloy steel that may be readily forged, machined and welded. It may be heat treated to a wide range of strength and ductility levels.

AISI 4145 is commonly used for a variety of applications in the oil and gas sector. Used often for the manufacture of down hole drilling tools such as drill collars. Other applications include gears, shafts for hydraulic presses, rolls for paper mills, pump shafts and tool holders.

(C)%	(Si)%	(Mn)%	(P)%	(S)%	(Ni)%	(Cr)%	(Mo)%	(Cu)%	(V)%
0.13~0.18	0.15~0.35	0.6~0.85	≦ 0.03	≦ 0.03	≦ 0.25	0.9~1.2	0.15~0.3	≦ 0.3
0.12~0.18	0.17~0.37	0.4~0.7	≦ 0.035	≦ 0.035	≦ 0.3	0.8~1.1	0.4~0.55	≦ 0.3
0.13~0.18	0.15~0.35	0.6~0.85	≦ 0.03	≦ 0.03	≦ 0.25	0.9~1.2	0.15~0.3	≦ 0.3
0.13~0.17	0.15~0.35	0.5~1.1	≦ 0.035	≦ 0.035		1~1.2	0.2~0.3
0.18~0.23	0.15~0.35	0.6~0.85	≦ 0.03	≦ 0.03	≦ 0.25	0.9~1.2	0.15~0.3	≦ 0.3
0.17~0.24	0.17~0.37	0.4~0.7	≦ 0.035	≦ 0.035	≦ 0.3	0.8~1.1	0.15~0.25	≦ 0.3
0.18~0.23	0.15~0.35	0.6~0.85	≦ 0.03	≦ 0.03	≦ 0.25	0.9~1.2	0.15~0.3	≦ 0.3
0.33~0.38	0.15~0.35	0.6~0.85	≦ 0.03	≦ 0.03		0.9~1.2	0.15~0.3	≦ 0.3
0.32~0.4	0.17~0.37	0.4~0.7	≦ 0.035	≦ 0.035		0.8~1.1	0.15~0.25	≦ 0.3
0.3~0.38	0.17~0.37	0.4~0.7	≦ 0.035	≦ 0.035		1~1.3	0.2~0.3	≦ 0.03	0.1~0.2
0.33~0.38	0.15~0.35	0.6~0.85	≦ 0.03	≦ 0.03		0.9~1.2	0.15~0.3	≦ 0.3
0.32~0.39	0.15~0.3	0.65~0.95	≦ 0.035	≦ 0.04	0.8~1.15	0.15~0.25
0.38~0.43	0.15~0.35	0.6~0.85	≦ 0.03	≦ 0.03	≦ 0.25	0.9~1.2	0.15~0.3	≦ 0.3
0.38~0.43	0.15~0.3	0.75~1	≦ 0.035	≦ 0.035		0.8~1.1	0.15~0.25
0.38~0.45	0.15~0.4	0.5~0.8	≦ 0.035	≦ 0.035		0.9~1.2	0.15~0.3

Chromium Molybdenum Steel for Machine Structural use

Product Applications

Steel data

Standard Code	Spec No.	Material No.	Mark
CNS	3229		SCM415
GB	3077		15CrMo
JIS	G4105		SCM415
DIN	17200	1.7262	15CrMo5
CNS	3229		SCM420
GB	3077		20CrMo
JIS	G4105		SCM420
CNS	3229		SCM435
GB	3077		35CrMo
GB	3077		35CrMoV
JIS	G4105		SCM435
AISI			4135
JIS	G4105		SCM440
AISI			4140
DIN	17200	1.7225	42CrMo4