SCM430 Alloy Steel-JIS G4105

SCM430 alloy steel manufacturers and suppliers,supplied with round rods,square/flat bars,rollers,shafts,blocks and forging pieces.

SCM430 is a chromium-molybdenum alloy steel as per Japan Standard.JIS SCM430 steel contains a lower carbon content but provides better weldability comparing with SCM440 Steel.It is frequently applied to the gas & oil area.Typical applications include components such as valve  bodies,pumps and fittings.

SCM430 Forged flat steel
Chemical Composition
Grade C% Si% Mn% Cr% Mo% P% S%
DIN 25CrMo4
0.22-0.29 ≤0.4 0.6-0.9 0.9-1.2 0.15-0.3 ≤0.025 ≤0.035
AISI/SAE 4130 0.28-0.33 0.15-0.35 0.4-0.6 0.8-1.1 0.15-0.25 ≤0.035 ≤0.04
JIS SCM430 0.28-0.33 0.15-0.35 0.6-0.85 0.9-1.2 0.15-0.3 ≤0.035 ≤0.04
GB 30CrMo  0.26-0.34  0.17-0.37  0.4-0.7  0.8-1.1  0.15-0.25  ≤0.035  ≤0.035
Shape Size(mm) Process Tolerance Length(mm)
Round Φ6-Φ50 Cold Drawn H11 3000-5800
Round Φ40-Φ300 Hot Rolled -0/+3mm 3000-10000
Round Φ120-Φ1000 Hot Forged -0/+3mm 3000-10000
Flat/Square/Block Thickness:120-800
Hot Forged -0/+3mm 500-6000

Heat Treatment
Normalizing For SCM430
1.Nominal normalizing temperature:840-910°C
2.Hold the temperature for several hours
3.Cooling in the air

Annealing  For SCM430
1.Nominal Annealing temperature:660-725°C
2.Cool slowly in the furance
3.Maximum Brinell hardness of 220

Hardening and Tempering(QT)  For SCM430
1.Nominal Hardening temperature:845-885°C
2.Hold at this temperature then quench in oil or water
3.Tempering  as soon as possible when the temperature low to ambient
4.Heat uniformly to the suitable temperature of 550-640°C
5.keep the material out of the furnace ,then cool in the air

Mechanical Property( for reference only)
1.Tensile strength: 980MPa
2.Yield point: 790MPa
3.Percentage reduction of area after fracture: 54%
4.Elongation after fracture: 14%
5.Impact test (+20°C): Transverse – 27~32J; Longitud – 45~52J

Delivery Condition
1.Shape:Round/Square / Flat/Shafts/Rollers/Blocks
2.Surface condition:Black surface/Bright surface
3.Heat Treatment:Normalized/Annealed/QT
4.Straightness:Max 3mm/m(Enhanced straightness may be available on request)
5.Length:3000-5800mm suitable for 20″container.  above 6000mm,suitable for 40″ container
6.Grain Size: 5-8 acc to ASTM E112-96
7.Ultrasonic Standard: Sep1921/ASTM A388/EN 10228-3
8.Non Metallic Inclusion: 2 max acc to ASTM E45 /K4≤20 acc to DIN 50602
9.Forging Ratio: minimum 4 : 1
10.Marking: Grade/Weight/Length/Size/Heat Number

Quality Certification
A material test report(Inspection Certificate EN 10204 3.1) will be provided, documenting the following:
1.Chemical analysis
2.Mechanical properties
3.Surface hardness
4.Non Metallic Inclusion
5.Heat Treatment Process
6.Grain size
7.Forging ratio
8.NDE test method/criteria