EN19/708M40 ALLOY STEEL-BS970
EN19/708M40 Alloy Steel manufacturers and suppliers,supplied with round rods,square/flat bars,rollers,shafts,blocks and forging pieces.
EN19/708M40 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.
| 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