ISO 4957 Grade 40CrMnMoS8-6
TYPICAL APPLICATIONS
Alloy tool steel is widely used to produce the cutting tool, cold/heat distortion
mould and measuring implements,
and further to manufacture the piston, valve, valve seat of fuel
pump of diesel engine.
Cutting tools
Mechanical parts
Air hammer tools
Piercing tools
PRODUCT DESCRIPTION
The
alloy is usually produced by EAF /VD /LF followed by electroslag refining
(ESR) if necessary for special purpose. Bars and, where applicable, forgings are subjected to ultrasonic
examination based on the different level according to the buyers'
requirements.
Bars are usually supplied bright in the softened condition.
Final heat treatment - heat treatment / QT
※ MATERIAL SPECIFICATIONS
EN ISO 4957: 2000 , DIN 17350 (1980)
※ AVAILABLE SHAPES
Black bar /Flat bar /Square bar
Bright - peeled + polishing /centerless grinding / peeled +
slidabrading
Forged - ring /tube /pipe casing /discs /shaft
Chemical composition(mass fraction)(wt.%)
| Elements | Min.(≥) | Max.(≤) |
|---|
| C | 0.35 | 0.45 |
| Si | 0.30 | 0.50 |
| Mn | 1.40 | 1.60 |
| P | | 0.030 |
| S | 0.05 | 0.10 |
| Cr | 1.80 | 2.00 |
| Mo | 0.15 | 0.25 |
| V | | |
Mechanical Properties
| Tensile strength | 206～844 | σb/MPa |
| Yield Strength | 398 | σ 0.2 ≥/MPa |
| Elongation | 94 | δ5≥(％) |
| ψ | - | ψ≥(％) |
| Akv | - | Akv≥/J |
| HBS | 558～382 | - |
| HRC | 30 | - |
Physical Properties| Thermal expansion | 86-93 | e-6/K |
| Thermal conductivity | 28-75 | W/m.K |
| Specific heat | 450-460 | J/kg.K |
| Melting temperature | 6414-0429 | 째C |
| Density | 9843-3299 | kg/m3 |
| Resistivity | 0.50-0.60 | Ohm.mm2/m |
| | |
Heat Treatment RegimeAnnealing | Quenching | Tempering | Normalizing | Q & T |
√ | √ | √ | √ | √ |
※ INVENTORY - hot rolled bar
Diameter: 12mm, 30mm, 44mm, 25mm
Quantity: 458kg
PRODUCT PROFILE
Round bar / Wire rod (Diameter): 0.50mm to 3000mm
Square bar / Flat bar: 3mm to 2000mm
Plate / Sheet steel / Steel strip: 0.1mm to 2500mm
Width: 8mm to 2500mm
Length: random length or based on the customer's special
requirement.
Forged steel shape: stepped shafts with flanks / discs /tubes
/slugs /donuts /cubes /other different shapes based on OEM.
Pipes / Tubings: OD 3-219 mm, with wall thickness ranging from 0.50
to 35 mm.
