SCM420

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JFS Steel's SCM420 and Steel Machining Service

Ju Feng Special Steel Co., Ltd. is an industrial steel materials, steel parts and steel-related services supplier from Taiwan. Along with steel bars, steel plates and steel tubes supply, steel cutting, drilling, machining and heat treatment services are also provided.

JFS Steel has been offering customers SCM420 Alloy Steel and precision steel machining services since 2006. With both highly skilled technology and 47 years experience, JFS Steel always makes sure to meet each customer's demand.


SCM420

Alloy Steel

Equivalent Grades: GB 20CrMo, JIS SCM420, ASTM 4118, DIN 25CrMo4. SCM420 are alloy steel with high hardenability, temper brittleness, well weldability, less cold cracking tendency, good machinability, and great cold plastic strain. SCM420 generally are used for the parts which need high wear resistance, such as gears, shafts, high-pressure pipes, all kinds of fasteners, and so on.

Carburizing structural steel

Purpose

SCM420 is widely used in general structural steel.

International Comparison of Meterials

EU
EN
INTER  ISOUSA 
AISI
JAPAN
JIS
GERMANY
DIN
CHINA
GB
FRANCE
AFNOR
ITALY
UNI
25CrMo4 25CrMo4 4130SCM42025CrMo430CrMn25CD425CrMo4(KB)

SPAIN
UNE
Sweden
SS
Finland
SFS
Poland
PN
Czechia
CSN
Austria
ONORM
Russia
GOST
England
BS
55Cr3222525CrMo4 ------20ChM1717CDS110

**This comparison table is for reference only. The standards and grades of various countries have slightly different chemical compositions. Please refer to the database for details.**

Chemical Composition(JIS G4051)

碳(C)%矽(Si)%錳(Mn)%磷(P)%硫(S)%鎳(Ni)%鉻(Cr)%鉬(Mo)%銅(Cu)%
0.18-0.230.15-0.350.6-0.850≦0.030≦0.030≦0.250.9-1.20.15-0.300≦0.3

Conditions of heat treatment

  • Annealing: 850℃ Furnace Cooling
  • Normalization: 850~900℃ Air Cooling
  • Hardening: 850~900℃ 1st Oil Cooling, 800~850℃ 2rd Oil Cooling
  • Tempering: 150~200℃ Air Cooling

Criterion for heat treating conditions revise:

  • Ac: 770~835℃
  • Ar: 770~700℃
  • Ms: 410℃

Mechanical properties

Tensile strength (kgf/mm²): ≧95
Elongation (%): ≧14
Cross section reduction rate (%): ≧40
Impact value (J/cm2): ≧6
Hardness (Hb) : 352~362

Size Range

ShapeSize(mm)
Round Bar13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 28, 30, 32, 34, 36, 38, 40, 42, 44, 45, 46, 48, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145, 150, 160, 170, 180, 190, 200, 210, 220, 230, 240, 250, 260, 270, 280, 290, 300, 315, 325, 335, 345, 355, 365, 375, 385, 395, 405, 415, 425, 435, 445, 455, 465, 475, 485, 495, 505, 515, 525, 535, 545, 555, 565, 575, 585, 595, 605.