NOS425 Die Steel Similar 1.2367 / DIEVAR / 8418 / W403 / DH31-S
NOS425, high quality hot work die steels, produced by SUPER technology.
High purity, homogeneous annealing structure, great toughness and ductility, that is helpful to reduce the risks of die cracks to the max.
NOS425 is applied for making die casting die, hot extrusion die, hot forging die, and hot stamping die, which is under the harsh production condition. It also can be used for making some kind of plastic mould because of its high mirror polishing performance.
NOS425 is strictly inspected as per standard of NADCA#207-2011, and other properties also can be tested as customers' requirement.
Chemical Composition (%)
Thick / Dia. (mm)
EAF+LF+VD+ESR, Forged, Spheroidizing Annealed, EFS, Hardness≤200HB, Black surface or Machined surface, UT 100% Passed
Take the advanced melting process for smelting and refining to get the super purified and homogeneous steels.
Take the advanced 3D forging technology to thinning the structure; eliminate the internal defect like shrinkage cavity and porosity; break the big-sized carburization and reduce the band segregation. It is helpful to reduce the discrepancy in the different directions of the steel.
Take the advanced Super-fining heat treatment technology to get the small grain size and homogeneous structure.
Take the strict inspection for each piece of steel products according to the most advanced standard. Ensure our customers use the steels with excellent and stable quality.
Physical Property (Q+T to be 45HRC)
Mechanical Property (Room temperature, S-T direction)
Tensile Strength (Rm)
Yield Strength (RP0.2)
Reduction of Area(ψ)
Heating steels upto 850ºC in protective atmosphere; after soaking, then have cooling in the furnace at the rate of 10ºC/hr; after temperature comes down to 650ºC, finally have air cooling.
Stress Relieving should be done on the die after rough machining, heating upto 650ºC, heat preservation for 2 hours; Slow cooling down to 500ºC, further air cooling.
Refer to Hardening Diagram,
Preheating in two steps as per A: 650ºC and B: 850ºC.
In case preheating in three steps, 2nd step B: 820ºC, 3rd step use 900ºC.
Austenization as per C: 1020-1030ºC
Direct cooling as per D, or Sectionalized cooling as per F:500-550ºC
Hardening Diagram Tempering Diagram
Refer to Tempering Diagram. Choose the proper tempering temperature for required hardness.
For die casting mould, temper at least 3 times.
For hot forging die and extrusion die, temper at least 2 times.
After tempering, it must need cooling down to room temperature.
Holding time for tempering is 2 hours min..
Tips: To avoid the temper brittleness, don't temper in 500-550ºC.
Hardness: HRC Residual Austenite %
Tempering Temperature (2h+2h) ºC
1. Holding time means the duration of die steel from total heating to Austenitization.
2. During hardening process, steel must be heated to avoid oxidation or decarburization.
3. Steels need to be tempered immediately when temperature gets down to be 50-70ºC.
4. To get excellent property for the die, the quenching speed should be as fast as possible,
but should avoid the case of being out of shape or cracks.
If you need more details, please refer to "Heat Treatment Manual" or consult us.
Quenching Holding Time and Thickness
Steel Grade Recommendation
Die Casting is a kind of metal casting technique. It is characterized by using the mould cavity to have high pressure on molten metal. It has the good performance in anti heat cracking, anti corrosion, anti-crack, red hardness.
Before extrusion, heat the metal over temperature of recrystallization. It has the good strength at high temperature, high ductility and good toughness, high thermal fatigue resistance and thermal wear resistance, as well as the anisotropic properties of consistency.
Hot forging is a kind of processing under the condition of over the temperature of recrystalization. It has the good thermal wear resistance, heat intensity, high ductility and good toughness, high thermal conductivity.
Hot Stamping is the rapid molding in the mould blank and hardening heat. It has the good thermal conductivity, hot bending strength, high toughness and ductility.
Injection molding is a kind of forming process of injection and molding at the same time. It has the high polishability, good corrosion resistance, wear resistance, anti-cracking and thermal conductivity.
Compressing Molding is a process of solidifying the thermosetting plastics through heating and pressing. It is usually used for plastic molding with reinforced glass fiber. It has the good wear resistance, strength, hardness and corrosion resistance.
Blow Molding is a process blowing the raw materials in the closed mould to be the hollow products by gas pressure. It has the medium strength and wear resistance, good thermal conductivity and corrosion resistance.
Extrusion Molding is a kind of process making the heat plasticized materials to be a specific profile though extrusion. It has the medium strength, but high demand on corrosion resistance and wear resistance. Nitridation is generally used for the mould of fiber reinforced products.
What we can offer
What we can offer?
We offer a wide range of steel products in a wide variety of dimensions and executions, acc.to the common international specifications or customerized.
Machining and heat treatment are available.
Also, we advise you in choosing the right materials.
Solid round bar
Hot Work Tool Steel
Die Casting Dies,Extrusion Dies, Hammer Dies,
1.2714 / 1.2713
Cold Work Tool Steel
Cutting Tools, Punching Tools, Shear Bladers, Reamers, Thread Rolling Dies, Calipers, Sockets etc.
Mold Base, Core & Cavity, Bumper Mold etc.
25CrMo4 / 1.7218
Shafts, Gears, Drillers, Chains, Bolts, Nuts, Pins, Suds, Keys, Bites, Crankshafts, Connecting Rods, Came, Couplings etc.
34CrMo4 / 1.7220
34CrMo4 / 1.7220
42CrMo4 / 42CrMoS4 / 1.7225
41CrMo4 / 1.7223
34CrNiMo6 / 1.6582
16MnCr5 / 16MnCrS5 / 1.7131
20MnCr5 / 20MnCrS5 / 1.7147
41Cr4 / 41CrS4 / 1.7035
21NiCrMo2 / 1.6523
40NiCrMo2-2 / 1.6546
18CrNiMo7-6 / 17CrNiMo6 / 1.6587
36CrNiMo4 / 1.6511
41CrAlMo7-10 / 1.8509
34CrAlNi7 / 1.8550
100Cr6 / 1.3505
100CrMn6 / 1.3520
100CrMo7-3 / 1.3536
55Cr3 / 1.7176
51CrV4 / 1.8159
60CrSi7 / 1.7108
CK10 / C10E / 1.1121
Shafts, Chains, Bolts, Nuts, Pins, Suds, Keys, Bites, Came, Couplings etc.
C22 / 1.0402
CK40 / C40E / 1.1186
CK45 / C45E / 1.1191
CK50 / C50E / 1.1206
CK55 / C55E / 1.1203
CK60 / C60E / 1.1221
High Speed Tool Steel
1). √ means we have stoc
2). Delivery Condition:
Smelting: EAF+LF+VD (+ESR)
Making: Hot rolled, Cold rolled, Forged, Cold Drawn
Heat Treatment: Untreated, Annealing, N+T, Q+T
Surface: Black, Peeled, Turned, Milled, Grinded, Polished
Packing & Shipping
Hot keywords:high quality