Blow Moulding

There are different methods for blow moulding, a process for shaping a hollow product by stretching a hot thermoplastic tube with air pressure and cooling it against a mould surface.

Blow moulding, in general, is a low pressure method where strength and wear demands are moderate, and a high productivity process where cycle time are of great importance. Corrosion is also a potential risk due to the common use of PVC especially in the production of bottles.

Consequently, important mould steel properties for blow moulding are moderate strength and wear demands, good heat conductivity and high corrosion resistance.

ASSAB’s answer for this application includes pre-hardened materials like ASSAB 718, Nimax, Mirrax 40, ASSAB MM40, Al alloys and through-hardened steel such as Stavax ESR and Mirrax ESR depending on requirement for wear and indentation resistance as well as plastic material.

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ASSAB 618 HH	ASSAB 618 HH is a pre-hardened plastic mould steel with good machinability and polishability. ASSAB 618 HH is DIN standard 1.2738 material.
ASSAB 618 T	ASSAB 618 T is a pre-hardened plastic mould steel suitable for medium and large tools that require good surface appearance. ASSAB 618 T is a modified grade of DIN standard 1.2738 material.
ASSAB 718 SUPREME	ASSAB 718 Supreme is a pre-hardened plastic mould steel with very good polishability. ASSAB 718 Supreme is DIN standard 1.2738 material. In markets served by Uddeholm, ASSAB 718 Supreme is promoted as Impax Supreme.
ASSAB 718 HH	ASSAB 718 HH is a pre-hardened plastic mould steel with very good polishability. ASSAB 718 HH is DIN standard 1.2738 material. In markets served by Uddeholm, ASSAB 718 HH is promoted as Impax HH.
NIMAX	Nimax is a low carbon steel with excellent toughness, machinability and weldability. Nimax also has good polishing and etching properties. This grade provides a minimum risk for unexpected failures due to the high pre-hardened hardness in combination with high toughness.
MIRRAX 40	Mirrax 40 is a pre-hardened corrosion resistant mould steel with very good toughness, good machinability and excellent polishing properties. Mirrax 40 is an electroslag remelted (ESR) steel supplied at hardness level approx 40 HRC.
CORRAX	Corrax is a precipitation hardening steel with superior corrosion resistance and easy to heat treat. Corrax provides good dimensional stability. This product is used both as mould material and engineering material.
ASSAB 2083	ASSAB 2083 is a corrosion resistant mould steel with high wear resistance and good polishability. This grade is produced through conventional production method and for superior polishability we recommend other products in our Stainless Concept series.
STAVAX ESR	Stavax ESR is the most renowned of the ASSAB plastic mould steels. As the core product in the Stainless Concept series it is characterised as a through hardening corrosion resistant mould steel with excellent polishability. Stavax ESR is electro slag remelted in order to further reduce the number of inclusions in the steel.
MIRRAX ESR	Mirrax ESR is a through hardening corrosion resistant steel with very good polishability. ASSAB recommends Mirrax ESR to be used for applications demanding medium to large cross sections. It has a unique combination of toughness, corrosion resistance and through-hardening properties.
RAMAX HH	Ramax HH is stainless steel for holder blocks. It is a corrosion resistant prehardened steel with good machinability. Good machinability and corrosion resistance reduces tool manufacturing and maintenance costs.
ROYALLOY	RoyAlloy is a patented free machining stainless holder steel, which is supplied in prehardened condition. RoyAlloy is designed specifically for plastic moulding applications aiming at providing reduced mould maintenance costs, worry free weld repair, dimensional stability and lower mould production costs.
PRODAX	Prodax is aluminium alloy recommended for blow moulds, prototype moulds and short run moulds with low demands on strength and wear resistance. This product is also suitable for many types of engineering applications.
ASSAB MM 40	ASSAB MM 40 is beryllium copper mould alloy supplied at approx 40 HRC. Copper-alloys are suitable mould materials where a combination of high thermal conductivity, corrosion resistance and polishablity is needed.