Chemical Composition
National Standard	Grade	C	Si	Mn	Cr	Mo	P	S
DIN	42CrMo4 (1.7225)	0.38-0.45	≤0.4	0.6-0.9	0.9-1.2	0.15-0.3	≤0.025	≤0.035
AISI/SAE	4140	0.38-0.43	0.15-0.35	0.7-1.0	0.8-1.1	0.15-0.25	≤0.035	≤0.04
JIS	SCM440	0.38-0.43	0.15-0.35	0.6-0.85	0.9-1.2	0.15-0.3	≤0.035	≤0.04
GB	42CrMo	0.38-0.45	0.17-0.37	0.5-0.8	0.9-1.2	0.15-0.25	≤0.035	≤0.035
BS	EN19	0.35-0.45	0.15-0.35	0.5-0.8	0.9-1.5	0.2-0.4	0.035	0.035

Size&Tolerance&Process
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 Width:120-1500	Hot Forged	-0/+3mm	500-6000

Heat Treatment
Normalizing For EN19/708M40 
1.Nominal normalizing temperature:840-880°C
2.Hold the temperature for several hours
3.Cooling in the air

Annealing For EN19/708M40 
1.Nominal Annealing temperature:790-840°C
2.Cool slowly in the furance
3.Maximum Brinell hardness of 225

Hardening and Tempering(QT) For EN19/708M40 
1.Nominal Hardening temperature:830-860°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 540-680°C
5.keep the material out of the furnace ,then cool in the air

Stress Relieve For EN19/708M40 
1.Nominal Stress Relieve temperature in the Quenched and Tempered condition:about 30-50°C below the tempering temperature.
2..Nominal Stress Relieve temperature in the Annealed condition:600-650°C
3.Cooling in the air.

Mechanical Property( for reference only)
1.Tensile strength: 850-1000MPa
2.Yield point: Min665MPa
3.Percentage reduction of area after fracture: 52%
4.Elongation after fracture: 13%
5.Impact test (+20°C): Transverse – 26~42J; Longitud – 49~55J

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.Typical Hardness:HB269-302
9.Non Metallic Inclusion: 2 max acc to ASTM E45 /K4≤20 acc to DIN 50602
10.Forging Ratio: minimum 4 : 1
11.Ingot Melting:EAF+LF+VD
12.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