Ni Cr. Mo. steel is a material that has Mo. element (<1.0%) added, to acquire its strength and toughness and become the most excellent steel type among all kinds of structural steel.This steel has good yield strength and resistance to stubbornness, good hardening performance, high toughness, high wear resistance and impact resistance.
spindle, gears, pistons, auto and motorcycle parts, screws, nuts ...etc.
SNCM420 is a commonly used low-carbon alloy carburized steel
MORESNCM420 is a commonly used low-carbon alloy carburized steel. Nickel (Ni), chromium (Cr), and molybdenum (Mo) are added. After carburizing and heat treatment, the surface has quite high hardness, wear resistance and contact fatigue strength, but at the same time The heart also retains good toughness and can withstand high impact loads.
Mainly used as impact-resistant and wear-resistant materials such as automobile bearings, spindles, gears, and mechanical parts.
[The code of each country]
SNCM420(JIS Japan), 4320(SAE/AISI U.S.), 20CrNi2Mo(GB China), SNCM420(CNS Taiwan)
[Conditions of heat treatment]
Annealing：850℃ Furnace cold
Normalization：850-900℃ Air Cooling
Quenching：For the first time 850-900℃ oil cooling, The second time770-820℃ oil cooling
Tempering：150-200℃ Air cooling
[Mechanical properties]
Tensile strength (kgf /mm²)：≥980
Elongation (%)：≥15
Cross section reduction rate (％)：≥40
Impact value (J / cm2)：≥69
Hardness (Hb)：≥293~375
SNCM616, is also called high-toughness steel, has the best w
MORESNCM616, is also called high-toughness steel, has the best wear-resistance among all kinds of Ni. Cr. Mo. steel; it is one of the materials that can undergo tensile strength above 1180 and other the most critical conditions. SNCM series steel contain lower carbon which makes them relatively high at Mo. content. Mo. is an additive that can affect material strength at high temperature and hardenability (curling resistance).
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8660, 8660+V are often used for hand-tool
SNCM220(8620), one of the common carburized low-carbon alloy
MORESNCM220(8620), one of the common carburized low-carbon alloy that has Ni. Cr. Mo. elements added to, has high surface roughness, wear-resistance and contact fatigue strength in the meantime keeping its good toughness for undergoing impact loads.
SNCM220 is widely applied to the fabrication of car bearings, shafts, gear, axial parts, pistons, automobile assembly parts, machinery accessories which are more critical for impact loads, wear-resistance and the hardness of the material surface.
SNCM220(JIS Japan), 8620(SAE/AISI U.S.), 21NiCrMo2/1.6523(DIN German), 20CrNiMo (GB China), SNCM220(CNS Taiwan), 20NiCrMo2(ISO International Standard).
SNCM220(8620), one of the common carburized low-carbon alloy
MORESNCM220(8620), one of the common carburized low-carbon alloy that has Ni. Cr. Mo. elements added to, has high surface roughness, wear-resistance and contact fatigue strength in the meantime keeping its good toughness for undergoing impact loads.
SNCM220 is widely applied to the fabrication of car bearings, shafts, gear, axial parts, pistons, automobile assembly parts, machinery accessories which are more critical for impact loads, wear-resistance and the hardness of the material surface.
SNCM220(JIS Japan), 8620(SAE/AISI U.S.), 21NiCrMo2/1.6523(DIN German), 20CrNiMo (GB China), SNCM220(CNS Taiwan), 20NiCrMo2(ISO International Standard).
SNCM439 is a kind of Ni. Cr. Mo. steel for structures that c
MORESNCM439 is a kind of Ni. Cr. Mo. steel for structures that contains 1.60~2.00% Ni, 0.60~1.00% Cr., 0.15~0.30% Mo and 0.36~0.43% carbon content; it is similar to AISI-4340.
Because SNCM 439 contains elements such as Ni., Cr. and Mo. which can enhance hardenability, it can be hardened effectively up to 70mm diameter (hardened depth can be nearly 35mm). The excellent attribute of strength and toughness come from quenching and tempering processes.
SNCM439 is a kind of high-toughness steel often applied to the fabrication of gears, mid-small size high-strength shafts, cranks, pistons, automobile assembly parts, various machinery, high-strength bolts and nuts.
SNCM439 is a kind of Ni. Cr. Mo. steel for structures that c
MORESNCM439 is a kind of Ni. Cr. Mo. steel for structures that contains 1.60~2.00% Ni, 0.60~1.00% Cr., 0.15~0.30% Mo and 0.36~0.43% carbon content; it is similar to AISI-4340.
Because SNCM 439 contains elements such as Ni., Cr. and Mo. which can enhance hardenability, it can be hardened effectively up to 70mm diameter (hardened depth can be nearly 35mm). The excellent attribute of strength and toughness come from quenching and tempering processes.
SNCM439 is a kind of high-toughness steel often applied to the fabrication of gears, mid-small size high-strength shafts, cranks, pistons, automobile assembly parts, various machinery, high-strength bolts and nuts.
SNCM439 is a kind of Ni. Cr. Mo. steel for structures that c
MORESNCM439 is a kind of Ni. Cr. Mo. steel for structures that contains 1.60~2.00% Ni, 0.60~1.00% Cr., 0.15~0.30% Mo and 0.36~0.43% carbon content; it is similar to AISI-4340.
Because SNCM 439 contains elements such as Ni., Cr. and Mo. which can enhance hardenability, it can be hardened effectively up to 70mm diameter (hardened depth can be nearly 35mm). The excellent attribute of strength and toughness come from quenching and tempering processes.
SNCM439 is a kind of high-toughness steel often applied to the fabrication of gears, mid-small size high-strength shafts, cranks, pistons, automobile assembly parts, various machinery, high-strength bolts and nuts.
| Standard Code | Spec No. | Material No. | Mark |
|---|---|---|---|
| CNS | 3271 | SNCM220 | |
| JIS | G4103 | SNCM220 | |
| AISI | 8620 | ||
| CNS | 3271 | SNCM420 | |
| JIS | G4103 | SNCM420 | |
| AISI | 4320 | ||
| CNS | 3271 | SNCM439 | |
| JIS | G4103 | SNCM439 | |
| AISI | 4340 | ||
| CNS | 3271 | SNCM815 | |
| JIS | G4103 | SNCM815 | |
| SAE | G86600 | 8660 | |
| CNS | 8660+V |
| (C)% | (Si)% | (Mn)% | (P)% | (S)% | (Ni)% | (Cr)% | (Mo)% | (Cu)% | (V)% |
|---|---|---|---|---|---|---|---|---|---|
| 0.17~0.23 | 0.15~0.35 | 0.6~0.9 | ≦ 0.03 | ≦ 0.03 | 0.4~0.7 | 0.4~0.65 | 0.15~0.3 | ≦ 0.3 | |
| 0.17~0.23 | 0.15~0.35 | 0.6~0.9 | ≦ 0.03 | ≦ 0.03 | 0.4~0.7 | 0.4~0.65 | 0.15~0.3 | ≦ 0.3 | |
| 0.18~0.23 | 0.15~0.3 | 0.7~0.9 | ≦ 0.035 | ≦ 0.04 | 0.4~0.7 | 0.4~0.6 | 0.15~0.25 | ||
| 0.17~0.23 | 0.15~0.35 | 0.4~0.7 | ≦ 0.03 | ≦ 0.03 | 1.6~2 | 0.4~0.65 | 0.15~0.3 | ≦ 0.3 | |
| 0.17~0.23 | 0.15~0.35 | 0.4~0.7 | ≦ 0.03 | ≦ 0.03 | 1.6~2 | 0.4~0.65 | 0.15~0.3 | ≦ 0.3 | |
| 0.17~0.22 | 0.15~0.3 | 0.45~0.65 | ≦ 0.035 | ≦ 0.04 | 1.65~2 | 0.4~0.6 | 0.2~0.3 | ||
| 0.36~0.43 | 0.15~0.35 | 0.6~0.9 | ≦ 0.03 | ≦ 0.03 | 1.6~2 | 0.6~1 | 0.15~0.3 | ≦ 0.3 | |
| 0.36~0.43 | 0.15~0.35 | 0.6~0.9 | ≦ 0.03 | ≦ 0.03 | 1.6~2 | 0.6~1 | 0.15~0.3 | ≦ 0.3 | |
| 0.38~0.43 | 0.15~0.35 | 0.6~0.9 | ≦ 0.035 | ≦ 0.035 | 1.5~2 | 0.7~0.9 | 0.2~0.3 | ||
| 0.12~0.18 | 0.15~0.35 | 0.3~0.6 | ≦ 0.03 | ≦ 0.03 | 4~4.5 | 0.7~1 | 0.15~0.3 | ≦ 0.3 | |
| 0.15~0.35 | 0.15~0.35 | 0.3~0.6 | ≦ 0.03 | ≦ 0.03 | 4~4.5 | 0.7~1 | 0.15~0.3 | ≦ 0.3 | |
| 0.56~0.64 | 0.15~0.35 | 0.75~1 | ≦ 0.035 | ≦ 0.04 | 0.4~0.7 | 0.4~0.6 | 0.15~0.25 | ||
| 0.56~0.64 | 0.15~0.35 | 0.75~1 | ≦ 0.035 | ≦ 0.04 | 0.7~0.6 | 0.4~0.6 | 0.15~0.25 | 0.15~0.25 |