Steel Options

Daido Steel – Steel Chart

DAIDO Plastic Mould Steel

Material GradeHardnessCharacteristicsApplications
PAC5000Prehardened to HB336 – 371Patent composition to reduce cracking during welding process; homogenous structure and hardness; good texturing property; can be polished up to #5000Plastic injection mould for medium production run with high texturing requirement such as housing for Office Equipment, Copier, Printer; not suitable for moulding corrosive resins
NAK80Prehardened to HB344 – 400Age hardening steel with high delivery hardness; excellent texturing and EDM properties; can be polished up to #8000Plastic injection mould for medium production run with high polishing and texturing requirement; not suitable for moulding corrosive resins
PAT 868Annealed to HB229(max)Special alloying design and steel making process to provide the material with integrated properties of high toughness, anti-corrosion and mirror polishabilityPlastic injection mould with the adoption of rapid heat and cool technology, mould insert or slider for long production run with complicated mould design and high polishing or texturing requirement
S-STARPrehardened to HB290 – 330High purity with fine microstructure, can be polished to mirror finish. Excellent corrosion resistance and low deformation during heat treatmentPlastic injection mould with small to medium size, long production run and high polishing requirement, e.g. PMMA, PC, resins such as PVC, PA, POM or additives with corrosive property, machine part for food processing machinery
S-STAR-AAnnealed to HB229(max)Plastic injection mould with small to medium size, medium production run and high polishing requirement, e.g. PMMA, PC, resins such as PVC, PA, POM or additives with corrosive property, machine part for food processing machinery

DAIDO Hot Work Steel

Material GradeHardnessCharacteristicsApplications
DH31-SAnnealed to HB235(max)Good through-hardening property, high resistance to thermal fatigue and hot erosionSmall to medium size Al and Mg alloy die casting dies, component for die casting die, Al alloy extrusion die
DHA1Annealed to HB229(max)Good toughness and resistance to thermal fatigueSmall size Zn alloy die casting die, component for die casting die, Al alloy extrusion die,through-hardened plastic injection mould
DHA-WORLDAnnealed to HB229(max)Excellent through-hardening property, high resistance to thermal fatigue and hot erosionMedium to big sizes Al and Mg alloy die casting dies with medium to long production run
DH31-EXAnnealed to HB235(max)Excellent through-hardening property and toughness, excellent resistance to thermal shock and thermal fatigue, high hot strength and fracture toughness, superior resistance to heat checking and hot erosionBig sizes Al and Mg alloy die casting dies with long production run

DAIDO Cold Work Steel

Material GradeHardnessCharacteristicsApplications
DC53Annealed to HB255Toughness is better than that of conventional SKD11; hardness can be attained to around HRC62 after high-temperature tempering, which massively reduces the risk of cracking during wire-cutting (WEDM) or grinding processes; suitable for surface treatmentCold work dies for stamping, forming, deep drawing, rolling

ASSAB Steel – Steel Chart

ASSAB Plastic Mould Steel

Material GradeHardnessCharacteristicsApplications
IMPAX 718HPrehardened to HB330 – 380Homogenous microstructure, stable quality, good texturing and EDM propertyPlastic injection mould for medium production run and PS, PE, PP, ABS and other non-corrosive resins
NIMAXPrehardened to HB360 – 400Good polishing and texturing properties. Superior EDM-ability and machinability. High toughness and good weldabilityPlastic injection mould for various applications such as LCD TV panels, interior part for automobile, engineering components and those resins without corrosive property
S136(STAVAX ESR)Annealed to HB200High purity with fine microstructure, can be polished to mirror finish. Excellent corrosion resistance and low deformation during heat treatmentPlastic injection mould with small to medium size, long production run and high polishing requirement, e.g. PMMA, PC, resins such as PVC, PA, POM or additives with corrosive property, machine part for food processing machinery
S136H
(STAVAX ESR
(PRE-HARDENED)
Prehardened to HB290 – 330Plastic injection mould with small to medium size, medium production run and high polishing requirement, e.g. PMMA, PC, resins such as PVC, PA, POM or additives with corrosive property, machine part for food processing machinery
S136 SUP
(MIRRAX ESR)
Annealed to HB250(max)Improved version of S136 with better corrosion resistance and toughnessLarge size and complicated structure plastic mould for PMMA, PC, PVC, PA, POM plastics and machine part for food processing machinery
S136H SUP
(MIRRAX ESR
(PRE-HARDENED)
Prehardened to HB290 – 330Improved version of S136H with better corrosion resistance and toughness
POLMAXAnnealed to HB200Ultra-high purity and extremely low segregation by double remelting process(ESR+VAR). Superb polishability to attain optical standard. Good corrosion resistance and low deformation during heat treatmentHigh quality moulds for Lens, optical products, compact discs and medical applications
ROYALLOYPrehardened to HB290 – 330Superior machinability, good corrosion resistance, uniform and consistent hardness in every dimension, excellent weldabilityMould base of plastic mould with requirement of long run, corrosion resistance and high precision; also suitable for plastic and rubber moulds, machine part with low requirement on polishability and texturing

ASSAB Hot Work Steel

Material GradeHardnessCharacteristicsApplications
DIEVAR 8418Annealed to HB160High purity, good high-temperature strength, outstanding temperature resistance and excellent resistance to heat checking, excellent hardenability, good dimensional stability during hardeningHigh demand light-alloy die casting die, hot forging inserts, extrusion dies with long production run
ORVAR 8407Annealed to HB185High purity, high toughness and good resistance to thermal fatigueDie casting die, extrusion die, through-hardened plastic mould for PA, POM,PS, PE, EP and other non-corrosive plastics

ASSAB Cold Work Steel

Material GradeHardnessCharacteristicsApplications
CALMAX 635Annealed to HB200Combining with high toughness and high wear resistance; good hardenability and can be flame hardening to HRC56-60 with harden layer up to 5mm thickHeavy duty blanking, forming tool or coining tool which required good adhesive wear resistance; also suitable for moulding fibre-reinforce plastics

Baowu Special Metallurgy – Steel List

Baowu special metal mold steel

Steel numberhardnessSteel propertiesGeneral purpose
SW318HPre-hardened to HRC 28-36Pre-hardened non-tempered forged steel, the hardness uniformity of large-size section is higher than traditional domestic 2311, and has good weldability and thermal conductivity.Applicable to small and medium-sized production of automotive interior parts molds and home appliance shell mold back molds, not suitable for adding plastic flame retardant rubber and other corrosive plastics such as POM, PVC, etc.
SW718HPre-hardened to HRC 30-36Pre-hardened and tempered forged steel, steel density and purity are better than traditional domestic 2738, high material stabilitySuitable for medium-sized production of large-scale home appliance shell molds, office stationery shell molds and automotive interior and exterior trim molds, not suitable for adding plastic flame retardant rubber and other corrosive plastics such as POM, PVC, etc.
SW718HHPre-hardened to HRC 36-40