CS243906B1 - Liaía tool steel especially suitable for die and die castings - Google Patents

Abstract

The invention relates to tool steel for die castings and die inserts and solves the problem of increasing wear resistance, heat resistance, foundry and physical-mechanical properties. The essence of the invention lies in the fact that the tool steel contains 0.25 to 0.65 wt. % carbon, 0.20 to 1.10 wt. % silicon, 0.20 to 1.20 wt. % manganese, 1.00 to 5.50 wt. % chromium, 1.00 to 2.50 wt. % nickel, 0.60 to 3.00 wt. % molybdenum, 0.10 to 1.10 wt. % vanadium, max. 0.03 wt. % phosphorus, max. 0.03 wt. % sulfur, 0.01 to 0.06 wt. % aluminum, 0.005 to 0.05 wt. % calcium, 0.01 to 0.20 wt. % niobium, 0.0005 to 0.01 wt. % boron. Niobium can be replaced by 0.01 to 0.08 wt. % titanium and/or zirconium. The cast tool steel according to the invention exhibits, in comparison with similar materials used so far, higher abrasion resistance, heat resistance and higher foundry and physical-mechanical properties. The invention can be used in industry for the production of solid die castings of all sizes, deep and complex shapes, die inserts, molds for metal pressure casting, matrices, punches, extruders, cutting tools and other tools, especially for hot forming.

Description

(54) Die cast steel suitable especially for die and die castings

2

The invention relates to tool steel for die casting and die inserts and solves the problem of increasing wear resistance, heat resistance, foundry and physico-mechanical properties. The principle of the invention is that the tool steel contains 0.25 to 0.65% by weight. % of carbon, 0.20 to 1.10 wt. 0.20 to 1.20% w / w; manganese,

1.00 to 5.50 wt. of chromium, 1.00 to 2.50 washes. wt. % nickel, 0.60 to 3.00 wt. % molybdenum, 0.10 to 1.10 wt. vanadium, max.

0.03 wt. phosphorus, max. 0.03 wt. % sulfur, 0.01 to 0.06 wt. % aluminum, 0.005 to 0.05 wt.%, calcium, 0.01 to 0.20 wt. % niobium, 0.0005 to 0.01 wt. boron. Niobium can be replaced by 0.01 to 0.08 wt. titanium and / or zirconium.

The cast tool steel according to the invention exhibits higher abrasion resistance, heat resistance and higher foundry and physico-mechanical properties compared to similar materials used hitherto.

The application of the invention is possible in the industry for the production of solid die castings of all sizes, deep and complex shapes, die inserts, die-casting molds, dies, punches, punches, shearing tools and other tools, in particular for hot forming.

243

The invention relates to tool steel for die casting and die inserts and solves the problem of increasing wear resistance, heat resistance, foundry and physico-mechanical properties.

To date, this type of cast tool steel for die and die inserts is not known. Some experience has been gained with the pre-casting of 0.5% by weight steel dies. % of carbon, 0.4 wt. % silicon, 0.6 wt. % manganese, 1.2 wt. % chromium, 1.6 wt. % nickel, 0.6 wt. tungsten and similar steel grades. However, these steels do not fully meet the steel requirements for die casting such as high durability, wear resistance, hardness, crack resistance, fire resistance, increased toughness and ductility, etc.

These drawbacks are overcome by cast tool steel suitable in particular for die and die inserts, which contains 0.25 to 0.65% by weight. % of carbon, 0.20 to 1.10 wt. % silicon, 0.20 to 1.20 wt. % manganese, 1.00 to 5.50 wt. chromium, 1.00 to 2.50% weight. % nickel, 0.60 to 3.00 wt. % molybdenum, 0.10 to 1.10 wt. % vanadium, max, 0.03 wt. phosphorus, max. 0.03 wt. % of sulfur, 0.01 to 0.06 wt. % aluminum, 0.005 to 0.05% w / w; calcium, 0.01 to 0.20 washes. wt. % niobium, 0.0005 to 0.01 wt. boron. Niobium can be replaced with 0.01 to 0.08 pens. wt. titanium and / or zirconium.

The cast tool steel according to the invention exhibits higher abrasion resistance, heat resistance and higher foundry and physico-mechanical properties compared to similar materials used hitherto.

An example of the exact chemical composition of 10oG of that tool steel according to the invention in% by weight:

0.39% carbon 1.09% silicon 0.37% manganese 5.16% chromium 1.09% nickel 1.23% molybdenum 1.09% vanadium 0.024% phosphorus 0.017% sulfur 0.014% aluminum 0.035% calcium 0.05 % titanium 0.01% boron.

Tool steel shoe melted in a 250 kg induction furnace. Aluminum was added to the furnace prior to tapping and the elements (calcium, titanium, boron) were added to the ladle when tapping from the furnace.

In order to increase the purity of the tool steel, crack resistance and to improve the non-metallic spinning configurations, rare earth elements were added to the ladle in an amount of 0.05% by weight.

Compared to wrought tool steel of 19,663, wear resistance increased by 30-35%, hardness by 25% with unchanged ductility and resilient toughness.

The tool life of the cast tool steel was 25 to 40% higher.

Use of the invention is possible in the industry for the production of precision die castings of all sizes of deep and complex shapes, die inserts, die-casting dies, dies, punches, extrusion tools, tooling tools and other tools especially for hot forming.

Claims (1)

SUBJECT Cast tool steel suitable in particular for die and die inserts containing 0.25 to 0.65 wt. % of carbon, 0.20 to 1.10 wt. % silicon, 0.20 to 1.20 wt. % manganese, 1.00 to 5.50 wt. 1.00 to 2.50 wt. nickel, 0.60 to 3.00 washes. wt. % molybdenum, 0.10 to 1.10 wt. ynAlezu vanadium, max. 0.03 wt. phosphorus and max. 0.03 wt. % sulfur, characterized in that it contains 0.01 to 0.06 wt. % aluminum, 0.005 to 0.05% w / w; % calcium, 0.0005 to 0.01 wt. 0.01 to 0.20 wt. % niobium and / or 0.01 to 0.08 wt. titanium and / or zirconium.