EN19 / 708M40 / 709M40 Steel

EN19/708M40/709M40 Steel manufacturers and suppliers,supplied with round rods,square/flat bars,rollers,shafts,blocks and forging pieces.

EN19/708M40/709M40 Steel grade is a low-alloy steel including chromium and molybdenum as strengthening elements which has good strength and toughness, ductility,weldability and machinability. EN19/708M40  is widely used in the automotive, agricultural ,oil and gas industry. Typical uses are forged gears and shafts, spindles, fixtures, jigs and collars.

EN19/708M40/709M40 Steel Chemical Composition per BS 970

GRADE	C	Si	Mn	P	S	Cr	Mo
EN19	0.35-0.45	0.10-0.35	0.50-0.80	≤ 0.050	≤ 0.050	0.90-1.50	0.20-0.40
708M40	0.36-0.44	0.10-0.40	0.70-1.00	≤ 0.035	≤ 0.040	0.90-1.20	0.15-0.25
709M40	0.36-0.44	0.10-0.40	0.70-1.00	≤ 0.035	≤ 0.040	0.90-1.20	0.25-0.35

EN19/708M40/709M40 Steel 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

EN19/708M40/709M40 Steel Heat Treatment
Normalizing For EN19/708M40/709M40 Steel

1.Nominal normalizing temperature:840-880°C
2.Hold the temperature for several hours
3.Cooling in the air

Annealing For EN19/708M40/709M40 Steel

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

Hardening and Tempering(QT) For EN19/708M40/709M40 Steel

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 EN19/708M40/709M40 Steel

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.

EN19/708M40/709M40 Steel 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

EN19/708M40/709M40 Steel 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

EN19/708M40/709M40 Steel 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