1.2738 Mould Steel

1.2738 Mould Steel

1.2738 mould steel is no ordinary mould steel. It is a specially engineered, pre-hardened premium plastic mould steel. Its core value lies in:

Product Details

Ⅰ.What is 1.2738 mould steel? What makes it distinctive?

1.2738 mould steel is no ordinary mould steel. It is a specially engineered, pre-hardened premium plastic mould steel. Its core value lies in:

‘Pre-hardened and ready to use’ – saving time and effort: The material undergoes precise tempering (pre-hardening) before leaving the factory, achieving an ideal hardness range of approximately HRC 30-36. This eliminates the need for complex and time-consuming quenching and tempering processes upon receipt, significantly shortening the mould manufacturing cycle. It also reduces the risk of heat treatment deformation, keeping project timelines firmly under control.

Equivalent grades	GB		DIN		AISI		JIS		DAIDO
	3Cr2MnNiMo		1.2738		P20+Ni		—		—
Chemical Composition	C	Si	Mn	Cr	P	S	Ni	Mo	W	Other
	0.35-0.48	0.20-0.40	1.30-1.60	1.80-2.10	0.03MAX	0.03MAX	0.90-1.20	0.15-0.25	–	–
Available size	Round Bar		Diameter				Length
			10-800mm				2000-6000mm
	Flat Bar		Thickness		Width			Length
			16-1000mm		200-2200mm			2000-6000mm
Surface condition	Black surface/ Grinded/ Machined
Annealed hardness	28-35 HCR (After tempering )
Characteristics	Good polishing and photo-etching properties Good machinability High purity and good homogeneity Uniform hardness
Applications	Injection moulds for thermoplastics
	Extrusion dies for thermoplastics
	Blow moulds
	Forming tools, press – brake dies (possibly flame hardened or nitrided )
	Aluminium die casting prototype dies
	Structural components, shafts .
Heat Treatment	Annealing		710 – 730 °C
	Hardness after annealing		Max. 240 HB
	Stress relieving		Approx. 600 °C
	Hot forming		1050 – 850 °C
	Hardening		870 – 890 °C
	Quenching media		Oil, Salt bath, Vacuum
	Hardness after quenching		50 – 54 HRC
	Hardness after tempering		100 °C		200 °C		300 °C		400°C
			52HRC		51HRC		49HRC		46HRC

Pure lineage, stable and reliable: Premium 1.2738 employs advanced smelting techniques (e.g., EAF+LF+VD), ensuring high purity and uniform, dense microstructure. This inherently endows it with outstanding toughness, dimensional stability, and exceptional polishing performance, fundamentally guaranteeing long mould life and consistent product quality.

All-round performer, balanced performance: In its pre-hardened state, it perfectly balances high toughness, excellent machinability (cutting, milling, EDM), outstanding polishing capability (achieving mirror-like A1 grade), and superb etching performance. This makes it the ideal choice for manufacturing high-quality plastic products with stringent requirements.

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