SU703224A1 - Die steel - Google Patents

Description

(54) STEEL STAMPED

one

The invention relates to mechanical engineering, in particular to the search for stamped steels intended for the manufacture of hot-forming punching tools for casting, operating at an elevated temperature and dynamic loads.

Known stamped steel containing, eu.%:

Carbon

0.28-0.35 Manganese

0.6 -0.9 Silicon 0.8 -1.2

3.5-4.5 Chrome Tungsten

1.6-2.2 Vanadium 0.7 -1.1 0.1 -0.3 Molybdenum Else 1. Iron

At a test temperature of 20 ° C, this steel has the following mechanical properties after casting and tempering at 550 ° C: bw 125.2 kg / mm2; 8 0.8%; a „.0.7 kgm / cm; HB 514 kg / mm. The plastic properties of this steel, and especially its impact strength, are low, which excludes the possibility of using steel for cast dies operating under dynamic loads (hammer dies). The aim of the invention is to create die steel for a hot deformed cast tool that does not contain a deficient and expensive tungsten and provides, in the form of a cast, an increased impact strength with sufficiently high other mechanical properties, and also has an increased tempering time. bility and durability.

This is achieved by the fact that the proposed steel additionally contains cerium and nickel in the following ratio of components, weight. %:

Carbon

0.35-0.48

M.Arganets 0.3-0.7

Silicon 0.4 -0.7

Chrome 2.0 -3.0

Molybdenum 1.3 -1.7

Vanadium 0.3-0.6

Nickel 1.3 -1.9

Cerium 0.01-0.02

Iron Else

V. tab. 1 are examples of three compositions of the proposed steel. The steel is smelted in an open crucible acid lined induction furnace. The casting is carried out in combined ceramic forms (metal chills, lined with a refractory ceramic layer with a thickness of 5-7 mm).

t and l and c and 1 In tab. Figure 2 shows the mechanical properties of the proposed steel in the cast state and after optimal heat treatment (quenching from a temperature of 1000-1050 ° C, air cooling; tempering 600 ° C). T a b p and c and 2