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Hot Products

NOS425 Die Steel Similar 1.2367 / DIEVAR / 8418 / W403 / DH31-S

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NOS425 Die Steel Similar 1.2367 / DIEVAR / 8418 / W403 / DH31-S

Features

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.

Equivalence

AISI	ASSAB	DIN	BOHLER	JIS	DAIDO	BS
H13	8418	1.2367	W403	----	DH31-S	----

Chemical Composition (%)

C	Si	Mn	P	S	Cr	Mo	V
0.38 0.41	0.20 0.30	0.40 0.60	≤ 0.020	≤ 0.0005	5.00 5.50	2.20 2.50	0.40 0.60

Dimensions

Shape	Thick / Dia. (mm)	Width (mm)
Round	100-500	/
Block	100-400	200-1000

Delivery Condition

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)

Temperature ℃	Density Kg/m3	Elasticity Modulus Mpa	Thermal Expansivity X 10-6/℃	Thermal Conductivity W/(m℃)
20	7780	210000	--	--
400	7700	180000	12.7	31
600	7600	145000	13.3	32

Mechanical Property (Room temperature, S-T direction)

Hardness HRC	Tensile Strength (Rm) Mpa	Yield Strength (RP0.2) Mpa	Reduction of Area(ψ) Mpa
44	1480	1210	55%
48	1640	1380	55%
52	1900	1560	52%

Heat Treatment

Soft Annealing

Heating steels upto 850℃ in protective atmosphere; after soaking, then have cooling in the furnace at the rate of 10℃/hr; after temperature comes down to 650℃, finally have air cooling.

Stress relieving

Stress Relieving should be done on the die after rough machining, heating upto 650℃, heat preservation for 2 hours; Slow cooling down to 500℃, further air cooling.

Hardening

Refer to Hardening Diagram,

Preheating in two steps as per A: 650℃ and B: 850℃.

In case preheating in three steps, 2nd step B: 820℃, 3rd step use 900℃.

Austenization as per C: 1020-1030℃

Direct cooling as per D, or Sectionalized cooling as per F:500-550℃

Hardening Diagram Tempering Diagram

Tempering

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 500-550℃.

Hardness: HRC Residual Austenite %

Tempering Temperature (2h+2h) ℃

Tips

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 50-70℃.

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

Thickness mm	Time Sec	Thickness mm	Time Sec
5	60	50	300
10	90	60	390
20	160	70	420
30	240	80	440
40	280	90	495

Product Application

Industry	Features	Steel Grade Recommendation
Die Casting	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.	NOS411, NOS415, NOS425, NOS430, NOS560
Hot Extrusion	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.	NOS411, NOS415, NOS425, NOS430
Hot Forging	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.	NOS411, NOS415, NOS425, NOS430, NOS560
Hot Stamping	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.	NOS411, NOS415, NOS425, NOS430, NOS560
Injection Molding	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.	NOS411, NOS415, NOS425, GY336
Compression Molding	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.	NOS411, NOS415, NOS425, GY336
Blow Molding	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.	NOS411, NOS415, NOS425, GY336
Extrusion Molding	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.	NOS411, NOS415, NOS425, GY336

Performance Comparison

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.

Shape Available

Solid round bar

Flat bar

Square bar

Hexagon bar

Block

Plate

Sheet

Wire rod

Strip

	AISI	DIN	JIS	Stock	Application
Hot Work Tool Steel	H11	1.2343	SKD6	√	Die Casting Dies,Extrusion Dies, Hammer Dies, Ram Dies, Forging Dies etc.
	H13	1.2344	SKD61	√
	H10	1.2365	SKD7
	——	1.2367	——
	L6	1.2714 / 1.2713	SKT4	√
	H12	1.2606	SKD62
	H21	1.2581	SKD5	√
Cold Work Tool Steel	D3	1.2080	SKD1	√	Cutting Tools, Punching Tools, Shear Bladers, Reamers, Thread Rolling Dies, Calipers, Sockets etc.
	——	1.2601	~SKD11	√
	D2	1.2379	~SKD11	√
	——	1.2379 MOD	DC53 (Daido)	√
	D6	1.2436	——
	O1	1.2510	SKS3	√
	O2	1.2842	——
	A2	1.2363	SKD12
	S1	1.2550	——
	S7	1.2357	——
	——	1.2767	SKT6
	L2	1.2210	——
Plastic Mould Steel	P20	1.2311	——	√	Mold Base, Core & Cavity, Bumper Mold etc.
	P20+Ni	1.2738	——	√
	P20+S	1.2312	——	√
	——	1.2316	——
	420	1.2083	SUS420J2	√
	——	——	NAK80 (Daido)	√
Alloy Steel	4120	25CrMo4 / 1.7218	SCM420		Shafts, Gears, Drillers, Chains, Bolts, Nuts, Pins, Suds, Keys, Bites, Crankshafts, Connecting Rods, Came, Couplings etc.
	4135	34CrMo4 / 1.7220	SCM435
	4130	34CrMo4 / 1.7220	SCM430	√
	4140	42CrMo4 / 42CrMoS4 / 1.7225	SCM440	√
	4142	41CrMo4 / 1.7223	SCM440
	4145H	——	——
	4330V	——	——
	4340	34CrNiMo6 / 1.6582	SNCM439
	5115	16MnCr5 / 16MnCrS5 / 1.7131
	5120	20MnCr5 / 20MnCrS5 / 1.7147	SMnC420H
	5140	41Cr4 / 41CrS4 / 1.7035	SCr440	√
	8620	21NiCrMo2 / 1.6523	SNCM220
	8640	40NiCrMo2-2 / 1.6546	SNCM240
	——	18CrNiMo7-6 / 17CrNiMo6 / 1.6587	——
	9840	36CrNiMo4 / 1.6511	——
	E71400	41CrAlMo7-10 / 1.8509	SACM1
	——	34CrAlNi7 / 1.8550	——
Bearing Steel	E52100	100Cr6 / 1.3505	SUJ2	√	Bearing, Shafts etc.
	——	100CrMn6 / 1.3520	——
	——	100CrMo7-3 / 1.3536	——
Spring Steel	5155	55Cr3 / 1.7176	SUP9		Springs
	6150	51CrV4 / 1.8159	SUP10
	9261	60CrSi7 / 1.7108	——
Carbon Steel	1010	CK10 / C10E / 1.1121	S10C		Shafts, Chains, Bolts, Nuts, Pins, Suds, Keys, Bites, Came, Couplings etc.
	1020	C22 / 1.0402	S20C	√
	1040	CK40 / C40E / 1.1186	S40C	√
	1045	CK45 / C45E / 1.1191	S45C	√
	1050	CK50 / C50E / 1.1206	S50C	√
	1055	CK55 / C55E / 1.1203	S55C
	1064	CK60 / C60E / 1.1221	S58C
High Speed Tool Steel	M2	1.3343	SKH51	√	Reamer, End-mill, Hob, Cutter, Bite, Drill, Punch, Tap, Brooch etc.
	M7	1.3348	——
	M42	1.3247	SKH59	√
	M35	1.3243	SKH55	√
	T1	1.3355	SKH2
	T15	1.3202	——
	T42	1.3207	SKH57