CN103484756A

CN103484756A - Tank manufacturing method

Info

Publication number: CN103484756A
Application number: CN201310480151.7A
Authority: CN
Inventors: 张�杰; 王建荣
Original assignee: CSR Qishuyan Co Ltd
Current assignee: CRRC Qishuyan Co Ltd
Priority date: 2013-10-14
Filing date: 2013-10-14
Publication date: 2014-01-01
Anticipated expiration: 2033-10-14
Also published as: CN103484756B

Abstract

The invention relates to the technical field of tank manufacturing and particularly relates to a tank manufacturing method comprising the process flows of proportioning, base iron smelting, alloy adding, inoculation treatment and pouring, wherein the added alloy comprises the components: 0.50-0.90% of Mn, 0.20-0.40% of Cu and 0.040-0.080% of Sn; the carbon equivalents (CE) of all alloy elements are controlled within the range of 4.0-4.2%; the inoculation treatment is realized through the steps of discharging molten iron from a furnace, pouring a ladle, and meanwhile, inoculating along the flow. According to the scheme, a certain quantity of Mn, Cu and Sn are added in a smelting process, reasonable chemical components are controlled, and the proper CE is selected, so that a pearlitic structure is stabilized, a grain is refined, the mechanical property is improved, and furthermore, the strength of a tank is enhanced. A BS-1A long-acting inoculant is adopted, and the adding amount of the inoculant is 0.6-0.8%; through adding a certain quantity of BS-1A long-acting inoculant, the inoculation effect is enhanced, and the structural hardness is uniform.

Description

The manufacture method of casing

Technical field

The present invention relates to casing manufacturing technology field, especially a kind of manufacture method of casing.

Background technology

Original case manufacturing method is: batching-melting base iron--inoculation-cast, and such foundry goods technology is only required the Kang La Qiang Du>=200Mpa of single casting sample, graphite form: flake graphite, matrix is: perlite adds ferrite.But such method for casting, can not reach the technical requirements of knob Holland casing, the Kang La Qiang Du>=207Mpa of the single casting sample of the Dutch casing of general knob, hardness need to be at 159 ~ 211HB, graphite form, A type+B Xing>=70%, need guarantee with stable perlite the intensity of foundry goods provides a uniform casting body of hardness.

Summary of the invention

In order to overcome the deficiency of existing technical characterictic, the invention provides a kind of manufacture method of casing.

The technical solution adopted for the present invention to solve the technical problems is: a kind of manufacture method of casing, its technical process is: batching-melting base iron-interpolation alloy-inoculation-cast, it is characterized by, the alloy compositions of described interpolation is: Mn:0.50%～0.90%, Cu:0.20%～0.40%, Sn:0.040%～0.080%, the batching carbon equivalent (CE=[C+1/3 (Si+P)] %) be controlled at 4.0%～4.2%, described inoculation is: at the stove molten iron discharging, in casting ladle, carry out current-following inoculation.Add a certain amount of Mn in this programme fusion process, Cu, Sn, by controlling rational chemical composition, select suitable carbon equivalent, and for the stabilizing pearlite tissue, crystal grain thinning, improve mechanical property, to improve the intensity of casing.Described Sn amount 0.040～0.080% is controlled by inclined to one side lower limit, can avoid producing too much carbide.

According to another embodiment of the invention, further comprise nucleating agent: adopt the long-acting nucleating agent of BS-1A, add-on: 0.6～0.8%.This programme, by adding the long-acting nucleating agent of a certain amount of BS-1A, is strengthened pregnant effect, makes to organize hardness even.

According to another embodiment of the invention, further comprise according to another embodiment of the invention, further comprise that described batching comprises: C:3.20%～3.60%, Si:1.20%～1.50%, Mn:0.50%～0.90%, P≤0.12%, S≤0.12%, Sn:0.040%～0.080%, Cu:0.20%～0.40%.

According to another embodiment of the invention, before further comprising cast, spectrum samples is arranged, after the chemical composition of molten iron requires to meet the requirement of base iron chemical composition, molten iron discharging.

According to another embodiment of the invention, further comprise 1500～1550 ℃ of smelting temperatures, more than overheated ten minutes, with clean molten iron.

The invention has the beneficial effects as follows, the present invention, by controlling rational chemical composition, selects suitable carbon equivalent, adds a certain amount of Mn, Cu, and the Sn alloying element, for the stabilizing pearlite tissue, crystal grain thinning, improve the casing mechanical property; The Sn alloying element is controlled by inclined to one side lower limit, can avoid producing too much carbide; By adding the long-acting nucleating agent of a certain amount of BS-1A, strengthen pregnant effect, make to organize hardness even.

The accompanying drawing explanation

Below in conjunction with drawings and Examples, the present invention is further described.

Fig. 1 is schematic flow sheet of the present invention.

Embodiment

As Fig. 1 is structural representation of the present invention, a kind of manufacture method of casing, embodiment is as follows.

Embodiment mono-:

Alloying element: Mn:0.40%～0.50%, Cu:0.15%～0.20%, Sn:0.035%～0.040%;

Batching: C:3.20%～3.60%, Si:1.20%～1.50%, Mn:0.40%～0.50%, P≤0.12%, S≤0.12%, Sn:0.035%～0.040%, Cu:0.15%～0.20%, carbon equivalent (CE) is controlled at 4.0%～4.2%;

The long-acting nucleating agent of nucleating agent: BS-1A, 0.5%～0.6%;

The new pig iron, steel scrap and batching are carried out to melting, add a certain amount of Mn in fusion process, Cu, Sn, Mn 0.40%～0.50%, and Cu 0.15%～0.20%, and Sn 0.035%～0.040%.Spectrum samples before cast, after making the chemical composition of molten iron require to meet the base iron chemical composition to require, molten iron discharging.1500 ℃ of smelting temperatures, overheated 10min.Carry out current-following inoculation at the stove molten iron discharging in casting ladle.

The casing sample tensile strength of working it out by embodiment mono-<207 Mpa, hardness<159HB, content of pearlite in alloy is on the low side, does not meet technical requirements, and product is defective.

Embodiment bis-:

Alloying element: Mn:0.50%～0.90%, Cu:0.20%～0.40%, Sn:0.040%～0.080%;

Batching: C:3.20%～3.60%, Si:1.20%～1.50%, Mn:0.50%～0.90%, P≤0.12%, S≤0.12%, Sn:0.040%～0.080%, Cu:0.20%～0.40%, carbon equivalent (CE) is controlled at 4.0%～4.2%;

The long-acting nucleating agent of nucleating agent: BS-1A, 0.6～0.8%;

The new pig iron, steel scrap and batching are carried out to melting, add a certain amount of Mn, Cu, Sn, Mn:0.50%～0.90%, Cu:0.20%～0.40%, Sn:0.040%～0.080% in fusion process.Spectrum samples before cast, after making the chemical composition of molten iron require to meet the base iron chemical composition to require, molten iron discharging.Smelting temperature is pressed 1550 ℃, overheated 15 min.Carry out current-following inoculation at the stove molten iron discharging in casting ladle.

The casing sample tensile strength of working it out by embodiment bis->207 Mpa, hardness: 159 ~ 211HB, graphite form, A type+B Xing>=70%, meet the technical requirements of product, and product is qualified.

Embodiment tri-:

Alloying element: Mn:0.90%～1.00%, Cu:0.40%～0.45%, Sn:0.080%～0.090%;

Batching: C:3.20%～3.60%, Si:1.20%～1.50%, Mn:0.90%～1.00%, P≤0.12%, S≤0.12%, Sn:0.080%～0.090%, Cu:0.40%～0.45%, carbon equivalent (CE) is controlled at 4.0%～4.2%;

The long-acting nucleating agent of nucleating agent: BS-1A, 0.8%～0.9%;

The new pig iron, steel scrap and batching are carried out to melting, add a certain amount of Mn, Cu, Sn, Mn:0.90%～1.00%, Cu:0.40%～0.45%, Sn:0.080%～0.090% in fusion process.Spectrum samples before cast, after making the chemical composition of molten iron require to meet the base iron chemical composition to require, molten iron discharging.Smelting temperature is pressed 1580 ℃, overheated 20 min.Carry out current-following inoculation at the stove molten iron discharging in casting ladle.

The casing sample tensile strength of working it out by embodiment bis->207 Mpa, hardness:>211HB, hardness does not meet the technical requirements of product, and in addition, in the matrix of samples tissue, carbide content exceeds standard, and product is defective.

In above-described embodiment, the present invention is by suitable chemical composition, Mn:0.50%～0.90%, Cu:0.20%～0.40%, Sn:0.040%～0.080%, and suitable carbon equivalent (CE): 4.0%～4.2%, effective stabilizing pearlite tissue, crystal grain thinning, improve mechanical property.After adding the long-acting nucleating agent of a certain amount of BS-1A, pregnant effect is strengthened, and makes and organize hardness even.Such scheme two can reach the technical requirements of knob Holland casing: the tensile strength >=207Mpa of Dutch casing technical requirements single casting sample, hardness: 159～211HB, (hardness is tested in attached casting test block, attached casting test block size: 30mm * 30mm * 30mm), graphite form: A type+Type B >=70%, graphite size >=3 grade, ferrite content≤5%, cementite content is not more than 5%.

Wherein, when the Sn alloying element, during in lower limit 0.040 ~ 0.080%, the carbide of generation is less, can guarantee technical indicator, and effect is best simultaneously.

Above-mentioned, it is only preferred embodiment of the present invention, not be used for limiting scope of the invention process, all equalizations of doing according to the described shape of the claims in the present invention scope, structure, feature and spirit change and modify, and all should be included in claim scope of the present invention.

Claims

1. the manufacture method of a casing, its technical process is: batching-melting base iron-interpolation alloy-inoculation-cast, it is characterized by, the alloy compositions of described interpolation is: Mn:0.50%～0.90%, Cu:0.20%～0.40%, Sn:0.040%～0.080%, carbon equivalent is controlled at 4.0%～4.2%, and described inoculation is: at the stove molten iron discharging, in casting ladle, carry out current-following inoculation.

2. the manufacture method of casing according to claim 1, is characterized in that, nucleating agent: adopt the long-acting nucleating agent of BS-1A, add-on: 0.6～0.8%.

3. the manufacture method of casing according to claim 1, is characterized in that, described batching comprises: C:3.20%～3.60%, Si:1.20%～1.50%, Mn:0.50%～0.90%, P≤0.12%, S≤0.12%, Sn:0.040%～0.080%, Cu:0.20%～0.40%.

4. the manufacture method of casing according to claim 1, is characterized in that, before cast, spectrum samples arranged, after the chemical composition of molten iron requires to meet the requirement of base iron chemical composition, and molten iron discharging.

5. the manufacture method of casing according to claim 1, is characterized in that, 1500～1550 ℃ of smelting temperatures, more than overheated ten minutes, with clean molten iron.