CN1940113A - Die steel - Google Patents

Abstract

The invention belongs to steel; it is a kind of die steel to be exact. The component of the die steel is composed of as follows: C, Mn, Si, S, P, Cr, M0, V, Ni, Cu, Nb, Fe margin. The die steel in this invention has these functions such as higher isotropism and the organization is uniform, it is able to endure heatproof strain, high temperature impact, polishing and burnish print, corrode, it is suitable to the forge hot mould and special mould that has strict request of polishing, figure, it can be apply to mechanical manufacture industry broadly.

Description

A kind of die steel

Technical field

The invention belongs to steel, more precisely is a kind of die steel.

Background technology

At present, the hot-work die steel of domestic each manufacturer production, the tropism such as grade of steel is lower, and homogeneity of structure is relatively poor, and the mould life cycle of producing is short, and integrated performance index is lower.

Summary of the invention

Given this, the objective of the invention is to, a kind of die steel with high tropism and homogeneity of structure is provided.

Purpose of the present invention is achieved through the following technical solutions: a kind of die steel, form by following components in weight percentage:

C 0.35-0.45

Mn 0.20-0.50

Si 0.80-1.20

S ≤0.025

P ≤0.030

Cr 5.00-5.50

Mo 1.20-1.50

V 0.80-1.20

Ni ≤0.25

Cu ≤0.25

Nb 0.04-0.20

The Fe surplus

Manufacturing process: get the said components material, adopt electric furnace+vacuum outgas+electric slag refusion and smelting technology.

1, at first iron is melted in electric furnace, at 1540 ℃ of beginning slag making dephosphorizations, adopt the big quantity of slag, the stream slag operation;

2, after the slag making dephosphorization finished, the alkaline reduction slag was made in the reduction of skimming;

3, the desulfuration operation, sulphur content and composition reach requirement, and temperature reaches 1630 ℃, begins tapping;

4, molten steel enters refining furnace, carries out the slag making heating, and vacuumizes the blowing argon gas operation;

5, after vacuum metling finished, molten steel casting became electrode bar, for esr is prepared;

6, electrode bar is ready, carries out esr;

7, ESR ingot is carried out anneal;

8, carry out the steel ingot processing that homogenizes, under 1180-1230 ℃ of temperature, kept 10-30 hour;

9, conducting forging processing is carried out modified anneal afterwards.

Die steel of the present invention has higher tropism such as grade and homogeneity of structure, heat-resistant anti-fatigue, high temperature resistant impact, wear-resisting and the polishing printing performance, corrosion resistance nature is particularly suitable for the polishing texture mould of hot forged mould and particular requirement strictness, can be widely used in machine industry.

Embodiment

A kind of die steel, get:

C 0.40mg

Mn 0.35mg

Si 0.95mg

S 0.003mg

P 0.010mg

Cr 5.2mg

Mo 1.35mg

V 1.00mg

Ni 0.25mg

Cu 0.20mg

Nb 0.06mg

The Fe surplus

Manufacturing process: get the said components material, adopt electric furnace+vacuum outgas+electric slag refusion and smelting technology.

1, earlier iron is melted in electric furnace, at 1540 ℃ of beginning slag making dephosphorizations, adopt the big quantity of slag, the stream slag operation;

2, after the slag making dephosphorization finished, the alkaline reduction slag was made in the reduction of skimming;

3, the desulfuration operation, sulphur content and composition reach requirement, and temperature reaches 1630 ℃, begins tapping;

4, molten steel enters refining furnace, carries out the slag making heating, and vacuumizes the blowing argon gas operation;

5, after vacuum metling finished, molten steel casting became electrode bar, for esr is prepared;

6, electrode bar is ready, carries out esr;

7, ESR ingot is carried out anneal;

8, carry out the steel ingot processing that homogenizes, under 1220 ℃ of temperature, kept 20 hours;

9, conducting forging processing is carried out modified anneal afterwards, gets finished product.

Claims (1)

1. One, a kind of die steel is characterized in that: this die steel is made up of following components in weight percentage:

   C 0.35-0.45

   Mn 0.20-0.50

   Si 0.80-1.20

   S ≤0.025

   P ≤0.030

   Cr 5.00-5.50

   Mo 1.20-1.50

   V 0.80-1.20

   Ni ≤0.25

   Cu ≤0.25

   Nb 0.04-0.20

   The Fe surplus

   Manufacturing process: get the said components material, adopt electric furnace+vacuum outgas+electric slag refusion and smelting technology.

   1, at first iron is melted in electric furnace, at 1540 ℃ of beginning slag making dephosphorizations, adopt the big quantity of slag, the stream slag operation;

   2, after the slag making dephosphorization finished, the alkaline reduction slag was made in the reduction of skimming;

   3, the desulfuration operation, sulphur content and composition reach requirement, and temperature reaches 1630 ℃, begins tapping;

   4, molten steel enters refining furnace, carries out the slag making heating, and vacuumizes the blowing argon gas operation;

   5, after vacuum metling finished, molten steel casting became electrode bar, for esr is prepared;

   6, electrode bar is ready, carries out esr;

   7, ESR ingot is carried out anneal;

   8, carry out the steel ingot processing that homogenizes, under 1180-1230 ℃ of temperature, kept 10-30 hour;

   9, conducting forging processing is carried out modified anneal afterwards, gets finished product.