CN106756439A - A kind of low chrome casting switch cubicle condensation tube preparation method - Google Patents

Abstract

The invention discloses a kind of low chrome casting switch cubicle condensation tube preparation method, following processing step is included：The raw material of the following proportioning of selection：8 10 parts of chrome-nickel, 23 parts of brass, useless 40 46 parts of the pig iron, useless 46 parts of steel-casting, above-mentioned raw materials are fused into liquation by after carbonization treatment, liquation is transferred in medium-frequency induction furnace and is continued melting and is incubated, it is the fluorite of the liquation weight 1.5~1.8% to be added thereto to again, added during ladle-to-ladle as the iron scale of the aluminium liquid weight 0.8~1.2% carries out cooling treatment, the qualified liquation of Alloy constituent percentages is finally given, wherein requiring Cr1.65%, Mo0.7%, Ni0.8%；The present invention improves the corrosion resistance of pipe, thermal insulation, can be used as the renewal product of low-voltage complete switch equipment, is suitable to be used in various model switch cubicles.

Description

A kind of low chrome casting switch cubicle condensation tube preparation method

Technical field

The present invention relates to low chrome technical field, a kind of low chrome casting switch cubicle condenser pipe preparation side is particularly belonged to Method.

Background technology

At present, all kinds of low-tension switch cabinets of in the market generally there are following shortcoming:Structure is more loose, serial Versatility is weak, and breaking capacity is relatively low, and dynamic thermal stability is relatively poor；Distribution loop is arranged to inadequate economical rationality, various schemes Unit can not be combined according to the need for user, and in terms of electric elements, the condenser pipe quality of switch cubicle is for switch cubicle Temperature adjusting performance influence is very high.

The content of the invention

It is an object of the invention to provide a kind of low chrome casting switch cubicle condensation tube preparation method, the resistance to of pipe is improve Corrosivity, thermal insulation, can use as the renewal product of low-voltage complete switch equipment, be suitable in various model switch cubicles Use.

Technical scheme is as follows：

A kind of low chrome casting switch cubicle condensation tube preparation method, includes following processing step：

1）, the following proportioning of selection raw material：Chrome-nickel 8-10 parts, brass 2-3 parts, useless 40-46 part of the pig iron, give up cast steel Part 4-6 parts, above-mentioned raw materials are fused into liquation by after carbonization treatment, liquation being transferred in medium-frequency induction furnace and continuing melting simultaneously Insulation, then be added thereto to be the fluorite of the liquation weight 1.5~1.8%, added during ladle-to-ladle as the aluminium liquid weight 0.8~1.2% iron scale carries out cooling treatment, the qualified liquation of Alloy constituent percentages is finally given, wherein requiring Cr1.5 ~ 1.8%, Mo0.55 ~ 0.85%, Ni0.65 ~ 0.95%；

2）, casting technique carried out using metal pattern, use chilling technology in casting process, liquation pouring temperature and metal die it Between temperature difference at 750-800 DEG C, Quench will be produced to react after the cast of liquation high temperature, one layer of stone is covered on metal pattern inwall Ink, is obtained condenser pipe casting；

3）, condenser pipe casting carries out vacuum nitriding treatment respectively, vacuum nitriding treatment is that vacuum drying oven first is vented into vacuum After 5-10Pa, condenser pipe casting is warming up to 655~715 DEG C, while sending into nitric oxide and carbon dioxide with 1.2-1.5L/min Mixed gas, controling of the pressure of the oven is in 4.5-5.5Pa.

The qualified liquation of Alloy constituent percentages is finally given, wherein Cr1.65% is required, Mo0.7%, Ni0.8%.

Reduce chromium content in alloying component of the invention, Ni, Sn improve condenser pipe weather-resistant performance and Oxidation susceptibility, improve wearability, thermal conductivity can use as the renewal product of low-voltage complete switch equipment, be suitable to each Used in kind model switch cubicle.

Specific embodiment

A kind of low chrome casting switch cubicle condensation tube preparation method, includes following processing step：

1）, the following proportioning of selection raw material：9 parts of chrome-nickel, 2.5 parts of brass, useless 43 parts of the pig iron, useless 5 parts of steel-casting, Above-mentioned raw materials are fused into liquation by after carbonization treatment, liquation are transferred in medium-frequency induction furnace and are continued melting and is incubated, then It is added thereto to be the fluorite of the liquation weight 1.65%, it is the iron oxide of the aluminium liquid weight 1% to be added during ladle-to-ladle Skin carries out cooling treatment, finally gives the qualified liquation of Alloy constituent percentages, wherein Cr1.65%, Mo0.7% are required, Ni0.8%；

2）, casting technique carried out using metal pattern, use chilling technology in casting process, liquation pouring temperature and metal die it Between temperature difference at 780 DEG C, Quench will be produced to react after the cast of liquation high temperature, one layer of graphite, system are covered on metal pattern inwall Obtain condenser pipe casting；

3）, condenser pipe casting carries out vacuum nitriding treatment respectively, vacuum nitriding treatment is that vacuum drying oven first is vented into vacuum After 7Pa, condenser pipe casting is warming up to 685 DEG C, while sending into nitric oxide and carbon dioxide gas mixture, stove with 1.35L/min Voltage-controlled system is in 5Pa.

The mechanics properties testing data of embodiment of the present invention condenser pipe are as follows：

Tensile strength sigma b (MPa)：≥413

Elongation δ 5 (%)：≥11.2

Contraction percentage of area ψ (%)：≥40.2

Impact energy Ak v (J)：≥41.3.

Claims (2)

1. a kind of low chrome casting switch cubicle is used and condenses tube preparation method, it is characterised in that include following processing step：

1）, the following proportioning of selection raw material：Chrome-nickel 8-10 parts, brass 2-3 parts, useless 40-46 part of the pig iron, give up cast steel Part 4-6 parts, above-mentioned raw materials are fused into liquation by after carbonization treatment, liquation being transferred in medium-frequency induction furnace and continuing melting simultaneously Insulation, then be added thereto to be the fluorite of the liquation weight 1.5~1.8%, added during ladle-to-ladle as the aluminium liquid weight 0.8~1.2% iron scale carries out cooling treatment, the qualified liquation of Alloy constituent percentages is finally given, wherein requiring Cr1.5 ~ 1.8%, Mo0.55 ~ 0.85%, Ni0.65 ~ 0.95%；

2）, casting technique carried out using metal pattern, use chilling technology in casting process, liquation pouring temperature and metal die it Between temperature difference at 750-800 DEG C, Quench will be produced to react after the cast of liquation high temperature, one layer of stone is covered on metal pattern inwall Ink, is obtained condenser pipe casting；

3）, condenser pipe casting carries out vacuum nitriding treatment respectively, vacuum nitriding treatment is that vacuum drying oven first is vented into vacuum After 5-10Pa, condenser pipe casting is warming up to 655~715 DEG C, while sending into nitric oxide and carbon dioxide with 1.2-1.5L/min Mixed gas, controling of the pressure of the oven is in 4.5-5.5Pa.

2. low chrome casting switch cubicle according to claim 1 is used and condenses tube preparation method, it is characterised in that finally given The qualified liquation of Alloy constituent percentages, wherein Cr1.65% is required, Mo0.7%, Ni0.8%.